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A.A. Sukhanov
Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, Kazan 420029, Russia

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Journal article
Published: 19 January 2021 in Results in Physics
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The sensitivity of the nitrogen-vacancy (NV) color centers in diamond-based magnetometers strongly depends on the number of NV centers involved in the measurement. Unfortunately, an increasing concentration of NV centers leads to a decrease in their dephasing and coherence times if the nitrogen content exceeds a certain threshold level (approximately 1017cm-3 or 0.6 ppm). Here, we demonstrate that this increased dephasing can be efficiently compensated for by optimizing the electron irradiation dose in postprocessing procedures in the vicinity of the threshold concentration, thus extending the range of possible useful concentrations of NV centers in diamonds with a natural carbon content.

ACS Style

O.R. Rubinas; V.V. Soshenko; S.V. Bolshedvorskii; A.I. Zeleneev; A.S. Galkin; S.A. Tarelkin; S.Y. Troschiev; V.V. Vorobyov; V.N. Sorokin; A.A. Sukhanov; V.G. Vins; A.N. Smolyaninov; A.V. Akimov. Optimization of the coherence properties of diamond samples with an intermediate concentration of NV centers. Results in Physics 2021, 21, 103845 .

AMA Style

O.R. Rubinas, V.V. Soshenko, S.V. Bolshedvorskii, A.I. Zeleneev, A.S. Galkin, S.A. Tarelkin, S.Y. Troschiev, V.V. Vorobyov, V.N. Sorokin, A.A. Sukhanov, V.G. Vins, A.N. Smolyaninov, A.V. Akimov. Optimization of the coherence properties of diamond samples with an intermediate concentration of NV centers. Results in Physics. 2021; 21 ():103845.

Chicago/Turabian Style

O.R. Rubinas; V.V. Soshenko; S.V. Bolshedvorskii; A.I. Zeleneev; A.S. Galkin; S.A. Tarelkin; S.Y. Troschiev; V.V. Vorobyov; V.N. Sorokin; A.A. Sukhanov; V.G. Vins; A.N. Smolyaninov; A.V. Akimov. 2021. "Optimization of the coherence properties of diamond samples with an intermediate concentration of NV centers." Results in Physics 21, no. : 103845.

Journal article
Published: 28 December 2020 in Dyes and Pigments
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Two bianthryl dyads, with the two units connected at either the 2- or 9- positions of the anthryl moiety, were studied to establish the relationship between orientation of the anthryl moieties and the electronic coupling and intersystem crossing (ISC) efficiency. The anthryl moieties in the two dyads adopt a close-to-orthogonal geometry, with dihedral angles of 90° (9,9′-bianthryl) and 106° (2,9′-bianthryl) at the ground state, respectively. The charge transfer (CT) emission efficiency and the fluorescence lifetimes are clearly dependent on the electronic coupling between the two anthryls, and stronger coupling lead to higher fluorescence quantum yields (34% vs. 9%) and shorter luminescence lifetimes (13.9 ns vs. 38.6 ns). The bianthryl with more orthogonal geometry shows higher singlet oxygen quantum yields ΦΔ (9,9′-bianthryl, ΦΔ = 53%) than 2,9′-bianthryl (ΦΔ = 32%). Moreover, highly solvent polarity-dependent fluorescence emission and ΦΔ were observed for the dyads (ΦΔ = 22–53%), which is different from the trend of the monomer anthracene, thus we propose the spin-orbit charge transfer ISC (SOCT-ISC) is responsible for the triplet state productions of the dyads. Interestingly, we found that inducing a heavy atom (Br) does not increase the ISC yield of anthracene. ISC in bianthryls was also confirmed with nanosecond transient absorption spectroscopy, the featured T1→Tn absorption at ca. 433 nm was observed, and the triplet state lifetime are long (9,9′-bianthryl, τT = 353 μs; 2,9′-bianthryl, τT = 493 μs, in acetonitrile).

ACS Style

Xiaoyu Zhao; Andrey A. Sukhanov; Kepeng Chen; Xinyu Geng; Yu Dong; Violeta K. Voronkova; Jianzhang Zhao; Lang Liu. Effect of molecular conformation on the efficiency of the spin orbital charge recombination-induced intersystem crossing in bianthryls. Dyes and Pigments 2020, 187, 109121 .

AMA Style

Xiaoyu Zhao, Andrey A. Sukhanov, Kepeng Chen, Xinyu Geng, Yu Dong, Violeta K. Voronkova, Jianzhang Zhao, Lang Liu. Effect of molecular conformation on the efficiency of the spin orbital charge recombination-induced intersystem crossing in bianthryls. Dyes and Pigments. 2020; 187 ():109121.

Chicago/Turabian Style

Xiaoyu Zhao; Andrey A. Sukhanov; Kepeng Chen; Xinyu Geng; Yu Dong; Violeta K. Voronkova; Jianzhang Zhao; Lang Liu. 2020. "Effect of molecular conformation on the efficiency of the spin orbital charge recombination-induced intersystem crossing in bianthryls." Dyes and Pigments 187, no. : 109121.

Journal article
Published: 12 November 2020 in The Journal of Chemical Physics
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A perylene (Pery)–phenoxazine (PXZ) compact orthogonal electron donor/acceptor dyad was prepared to study the relationship between the molecular structures and the spin–orbit charge transfer intersystem crossing (SOCT-ISC), as well as the electron spin selectivity of the ISC process. The geometry of Pery–PXZ (80.0°) is different from the previously reported perylene–phenothiazine dyad (Pery–PTZ, 91.5°), although there is only one atom variation for the two dyads. Pery–PXZ shows a high singlet oxygen quantum yield (84%). Femtosecond transient absorption spectra indicate that the charge separation (CS, faster than 120 fs) is faster than the Pery–PTZ analog (CS, 250 fs) and charge recombination (CR, i.e., SOCT-ISC, 5.98 ns) of Pery–PXZ is slower than the Pery–PTZ analog (CR, 0.9 ns). The intrinsic triplet state lifetime of Pery–PXZ is 242 µs vs the lifetime of 181 µs for the Pery–PTZ analog. Moreover, the triplet state lifetime of Pery–PXZ in the solid polymer matrix is extended to 4.45 ms, which indicates that the triplet state of Pery–PXZ in fluid solution is deactivated not only by the triplet–triplet annihilation effect but also by other factors such as vibration coupled relaxation. Interestingly, with pulsed laser excited time-resolved electron paramagnetic resonance spectroscopy, the electron spin polarization (ESP) pattern of the triplet state of the current dyad is opposite to that of Pery–PTZ. These results demonstrated the rich electron spin chemistry of the ISC of compact electron donor/acceptor dyads, e.g., the ESP is dependent on not only the molecular geometry but also the structure of the electron donor (or acceptor).

ACS Style

Xiao Xiao; Junhong Pang; Andrei A. Sukhanov; Yuqi Hou; Jianzhang Zhao; Ming-De Li; Violeta K. Voronkova. The effect of one-atom substitution on the photophysical properties and electron spin polarization: Intersystem crossing of compact orthogonal perylene/phenoxazine electron donor/acceptor dyad. The Journal of Chemical Physics 2020, 153, 184312 .

AMA Style

Xiao Xiao, Junhong Pang, Andrei A. Sukhanov, Yuqi Hou, Jianzhang Zhao, Ming-De Li, Violeta K. Voronkova. The effect of one-atom substitution on the photophysical properties and electron spin polarization: Intersystem crossing of compact orthogonal perylene/phenoxazine electron donor/acceptor dyad. The Journal of Chemical Physics. 2020; 153 (18):184312.

Chicago/Turabian Style

Xiao Xiao; Junhong Pang; Andrei A. Sukhanov; Yuqi Hou; Jianzhang Zhao; Ming-De Li; Violeta K. Voronkova. 2020. "The effect of one-atom substitution on the photophysical properties and electron spin polarization: Intersystem crossing of compact orthogonal perylene/phenoxazine electron donor/acceptor dyad." The Journal of Chemical Physics 153, no. 18: 184312.

Full articles
Published: 01 September 2020 in Bulletin of the Academy of Sciences of the USSR Division of Chemical Science
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Optical and magnetic properties of CdS quantum dots (QDs) doped with europium(II) and gadolinium(III) ions were studied. l-Cysteine stabilized nanoparticles were synthesized by the colloidal method in aqueous media. The QDs obtained have a hexagonal crystal lattice. The nanoparticle size varies from 3 to 14 nm. The EPR spectra of nanoparticles prepared in different conditions were measured and analyzed. Dependences of the optical properties of nanoparticles on the reaction time and pH values were studied. The dependence of the luminescence properties of CdS QDs on the dopant ion type was established. It was shown that the increase in the reaction time and medium pH values favors a bathochromic shift of maxima in the luminescence spectra of nanoparticles.

ACS Style

D. O. Sagdeev; R. R. Shamilov; V. K. Voronkova; A. A. Sukhanov; Yu. G. Galyametdinov. Lanthanide-doped CdS quantum dots: luminescence and paramagnetic properties. Bulletin of the Academy of Sciences of the USSR Division of Chemical Science 2020, 69, 1749 -1754.

AMA Style

D. O. Sagdeev, R. R. Shamilov, V. K. Voronkova, A. A. Sukhanov, Yu. G. Galyametdinov. Lanthanide-doped CdS quantum dots: luminescence and paramagnetic properties. Bulletin of the Academy of Sciences of the USSR Division of Chemical Science. 2020; 69 (9):1749-1754.

Chicago/Turabian Style

D. O. Sagdeev; R. R. Shamilov; V. K. Voronkova; A. A. Sukhanov; Yu. G. Galyametdinov. 2020. "Lanthanide-doped CdS quantum dots: luminescence and paramagnetic properties." Bulletin of the Academy of Sciences of the USSR Division of Chemical Science 69, no. 9: 1749-1754.

Journal article
Published: 19 October 2019 in Photonics
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Synthesis of nanoparticles doped with various ions can significantly expand their functionality. The conditions of synthesis exert significant influence on the distribution nature of doped ions and therefore the physicochemical properties of nanoparticles. In this paper, a correlation between the conditions of synthesis of manganese-containing cadmium sulfide or zinc sulfide nanoparticles and their optical and magnetic properties is analyzed. Electron paramagnetic resonance was used to study the distribution of manganese ions in nanoparticles and the intensity of interaction between them depending on the conditions of synthesis of nanoparticles, the concentration of manganese, and the type of initial semiconductor. The increase of manganese concentration is shown to result in the formation of smaller CdS-based nanoparticles. Luminescent properties of nanoparticles were studied. The 580 nm peak, which is typical for manganese ions, becomes more distinguished with the increase of their concentration and the time of synthesis.

ACS Style

Yuriy G. Galyametdinov; Dmitriy O. Sagdeev; Andrey A. Sukhanov; Violeta K. Voronkova; Radik R. Shamilov. Monitoring of the Mechanism of Mn Ions Incorporation into Quantum Dots by Optical and EPR Spectroscopy †. Photonics 2019, 6, 107 .

AMA Style

Yuriy G. Galyametdinov, Dmitriy O. Sagdeev, Andrey A. Sukhanov, Violeta K. Voronkova, Radik R. Shamilov. Monitoring of the Mechanism of Mn Ions Incorporation into Quantum Dots by Optical and EPR Spectroscopy †. Photonics. 2019; 6 (4):107.

Chicago/Turabian Style

Yuriy G. Galyametdinov; Dmitriy O. Sagdeev; Andrey A. Sukhanov; Violeta K. Voronkova; Radik R. Shamilov. 2019. "Monitoring of the Mechanism of Mn Ions Incorporation into Quantum Dots by Optical and EPR Spectroscopy †." Photonics 6, no. 4: 107.

Research article
Published: 06 December 2018 in The Journal of Physical Chemistry C
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Spin-orbit charge transfer induced intersystem crossing (SOCT-ISC) is of particular interest for preparation of heavy atom-free triplet photosensitizers. Up to now examples for SOCT-ISC dyads are limited and electron donor/acceptor SOCT-ISC dyads showing strong visible light-harvesting are rare. Herein we studied the photophysics of a series of Bodipy-anthracene (BDP-An) compact dyads, especially the triplet state electron spin dynamics with the time-resolved electron paramagnetic resonance (TREPR) spectroscopy. The electronic coupling matrix elements (VDA) between the 1CT (charge transfer) state and 1LE (locally excited) state are in the range 773 cm-1 – 1545 cm-1. For one dyad, we observed three triplet states simultaneously with TREPR, i.e. the triplet states confined on the anthracene (3An) and the Bodipy (3BDP) moieties, as well as a 3CT state. Based on the electron spin polarization (ESP) of these three triplet states and the optical experiments, the SOCT-ISC mechanism is confirmed and the RP-ISC mechanism as the main ISC channel was excluded. Triplet-triplet annihilation (TTA) induced delayed fluorescence was observed for the dyads, which is rare for Bodipy fluorophores.

ACS Style

Zhijia Wang; Andrey A. Sukhanov; Antonio Toffoletti; Farhan Sadiq; Jianzhang Zhao; Antonio Barbon; Violeta K. Voronkova; Bernhard Dick. Insights into the Efficient Intersystem Crossing of Bodipy-Anthracene Compact Dyads with Steady-State and Time-Resolved Optical/Magnetic Spectroscopies and Observation of the Delayed Fluorescence. The Journal of Physical Chemistry C 2018, 123, 265 -274.

AMA Style

Zhijia Wang, Andrey A. Sukhanov, Antonio Toffoletti, Farhan Sadiq, Jianzhang Zhao, Antonio Barbon, Violeta K. Voronkova, Bernhard Dick. Insights into the Efficient Intersystem Crossing of Bodipy-Anthracene Compact Dyads with Steady-State and Time-Resolved Optical/Magnetic Spectroscopies and Observation of the Delayed Fluorescence. The Journal of Physical Chemistry C. 2018; 123 (1):265-274.

Chicago/Turabian Style

Zhijia Wang; Andrey A. Sukhanov; Antonio Toffoletti; Farhan Sadiq; Jianzhang Zhao; Antonio Barbon; Violeta K. Voronkova; Bernhard Dick. 2018. "Insights into the Efficient Intersystem Crossing of Bodipy-Anthracene Compact Dyads with Steady-State and Time-Resolved Optical/Magnetic Spectroscopies and Observation of the Delayed Fluorescence." The Journal of Physical Chemistry C 123, no. 1: 265-274.

Full paper
Published: 17 October 2018 in Chemistry – A European Journal
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We investigate the magnetism and the magnetization blocking of a series of [Fe2Dy2(OH)2(teaH)2(RC6H4COO)6] complexes, where teaH3 = triethanolamine and R = meta‐CN (1), para‐CN (2), meta‐CH3 (3), para‐NO2 (4) and para‐CH3 (5), by combining ab initio calculations and EPR measurements. BS‐DFT calculations show that in all compounds the Fe‐Fe exchange interaction is antiferromagnetic and by far stronger than Fe‐Dy and Dy‐Dy ones. As a result, the lowest two exchange doublets probed by EPR mostly originate from the Ising interaction of Dy ions in all compounds. A correct quantitative description of the splitting of these two doublets requires, however, an explicit account of Fe‐Dy and Fe‐Fe interactions. Due to the inversion symmetry of the complexes, the doublets under consideration are described by a collinear Ising exchange interaction. This picture is also supported by EPR spectra which could be simulated with parameters close to ones extracted from the calculations. The transversal g‐factors extracted from ab initio calculations have values in the range of 0.01 ‐ 0.2, testifying to the lack of high axiality of the ground state of Dy ions. This explains the lack/poor SMM behavior of this series of compounds at investigated temperatures of few Kelvin. Due to a very small gap (fractions of a wavenumber) between the ground and first excited exchange doublet, the relaxation takes place via magnetic moment reversal at individual Dy sites for the considered temperature domain.

ACS Style

Veacheslav Vieru; Liviu Ungur; Valeriu Cemortan; Andrey Sukhanov; Amer Baniodeh; Christopher E. Anson; Annie K. Powell; Violeta Voronkova; Liviu F. Chibotaru. Magnetization Blocking in Fe2 III Dy2 III Molecular Magnets: Ab Initio Calculations and EPR Spectroscopy. Chemistry – A European Journal 2018, 24, 16652 -16661.

AMA Style

Veacheslav Vieru, Liviu Ungur, Valeriu Cemortan, Andrey Sukhanov, Amer Baniodeh, Christopher E. Anson, Annie K. Powell, Violeta Voronkova, Liviu F. Chibotaru. Magnetization Blocking in Fe2 III Dy2 III Molecular Magnets: Ab Initio Calculations and EPR Spectroscopy. Chemistry – A European Journal. 2018; 24 (62):16652-16661.

Chicago/Turabian Style

Veacheslav Vieru; Liviu Ungur; Valeriu Cemortan; Andrey Sukhanov; Amer Baniodeh; Christopher E. Anson; Annie K. Powell; Violeta Voronkova; Liviu F. Chibotaru. 2018. "Magnetization Blocking in Fe2 III Dy2 III Molecular Magnets: Ab Initio Calculations and EPR Spectroscopy." Chemistry – A European Journal 24, no. 62: 16652-16661.

Original paper
Published: 19 July 2018 in Applied Magnetic Resonance
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A rescaling procedure is proposed for electron spin echo envelope modulation spectra observed at several electron paramagnetic resonance transitions. Analytical expressions describing the relations between the rescaled frequencies and hyperfine and quadrupole parameters of the remote nucleus are obtained. The dependences of the rescaled data on the external magnetic field and spin projections of the ion nucleus and the remote nuclei are used to derive the parameters of the nuclear state in the crystals Y2SiO5 and YVO4 doped by ion Nd3+.

ACS Style

Yuri E. Kandrashkin; Yuri D. Zavartsev; Sergei A. Koutovoi; Andrey A. Sukhanov. Rescaling of 2D ESEEM Data as a Tool for Inverse Problem Solving. Applied Magnetic Resonance 2018, 49, 1313 -1333.

AMA Style

Yuri E. Kandrashkin, Yuri D. Zavartsev, Sergei A. Koutovoi, Andrey A. Sukhanov. Rescaling of 2D ESEEM Data as a Tool for Inverse Problem Solving. Applied Magnetic Resonance. 2018; 49 (12):1313-1333.

Chicago/Turabian Style

Yuri E. Kandrashkin; Yuri D. Zavartsev; Sergei A. Koutovoi; Andrey A. Sukhanov. 2018. "Rescaling of 2D ESEEM Data as a Tool for Inverse Problem Solving." Applied Magnetic Resonance 49, no. 12: 1313-1333.

Accepted manuscript
Published: 28 June 2018 in Materials Research Express
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Paramagnetic Mn:CdS nanoparticles were synthesized by a colloidal method in a nonpolar solvent. The temperature and duration of synthesis were varied. The sizes of synthesized nanoparticles were determined by X-ray diffraction and dynamic light scattering in a crystal state and in an organic solvent. It was studied how optical (electronic absorption and luminescence spectra) and magnetic properties of synthesized compounds change with the reaction conditions. Longer synthesis intensifies migration of manganese ions from the bulk phase of nanoparticles to their surface. This effect is confirmed by changes in electron paramagnetic resonance spectra which characterize the ratio between different types of manganese ions and the shift of luminescence peaks to a shorter wave range.

ACS Style

Yuriy Galyametdinov; Dmitriy O. Sagdeev; Violeta Voronkova; Andrei Sukhanov; Radik Shamilov. The dependence of paramagnetic and optical characteristics of Mn:CdS nanoparticles on high-temperature synthesis conditions. Materials Research Express 2018, 5, 075009 .

AMA Style

Yuriy Galyametdinov, Dmitriy O. Sagdeev, Violeta Voronkova, Andrei Sukhanov, Radik Shamilov. The dependence of paramagnetic and optical characteristics of Mn:CdS nanoparticles on high-temperature synthesis conditions. Materials Research Express. 2018; 5 (7):075009.

Chicago/Turabian Style

Yuriy Galyametdinov; Dmitriy O. Sagdeev; Violeta Voronkova; Andrei Sukhanov; Radik Shamilov. 2018. "The dependence of paramagnetic and optical characteristics of Mn:CdS nanoparticles on high-temperature synthesis conditions." Materials Research Express 5, no. 7: 075009.

Original paper
Published: 17 May 2018 in Applied Magnetic Resonance
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The main observation in this work is a decrease in the modulation frequency of the primary electron spin-echo decay (ESEEM) of the \({\text{P}}_{ 7 0 0}^{ + }\) cofactor in the reaction center of Photosystem I (PS I) from cyanobacteria Synechocystis sp. PCC 6803 embedded in dry trehalose matrix as the temperature rises from 150 K to room temperature. From the previous studies of the EPR spectrum shape of this system, it is known that, in dry trehalose matrix at room temperature, the distance between \({\text{P}}_{ 7 0 0}^{ + }\) and \({\text{A}}_{ 1}^{ - }\) spins does not increase compared to the distance measured in glycerol–water solution at cryogenic temperature. From the present ESEEM study, we conclude that the decrease of modulation frequency with rising temperature in trehalose matrix can be fully attributed to the influence of accelerated spin–lattice relaxation of \({\text{A}}_{ 1}^{ - }\). Our calculations show that this requires a decrease in the spin–lattice relaxation time from 3 to 1 μs. To the best of our knowledge, this is the first time that a shift in the ESEEM frequency due to the dipole–dipole interaction between the spins is observed that is caused by spin–lattice relaxation. Based on the above-mentioned results, we formulate a model of the protective effect of trehalose matrix on the electron transfer in the reaction center of PS I that is based on different hydrogen-bond networks between trehalose, local water, and protein.

ACS Style

A. A. Sukhanov; M. D. Mamedov; K. Möbius; A. Yu. Semenov; K. M. Salikhov. The Decrease of the ESEEM Frequency of $${\text{P}}_{700}^{ + } {\text{A}}_{1}^{ - }$$ P 700 + A 1 - Ion-Radical Pair in Photosystem I Embedded in Trehalose Glassy Matrix at Room Temperature can be Explained by Acceleration of Spin–Lattice Relaxation. Applied Magnetic Resonance 2018, 49, 1011 -1025.

AMA Style

A. A. Sukhanov, M. D. Mamedov, K. Möbius, A. Yu. Semenov, K. M. Salikhov. The Decrease of the ESEEM Frequency of $${\text{P}}_{700}^{ + } {\text{A}}_{1}^{ - }$$ P 700 + A 1 - Ion-Radical Pair in Photosystem I Embedded in Trehalose Glassy Matrix at Room Temperature can be Explained by Acceleration of Spin–Lattice Relaxation. Applied Magnetic Resonance. 2018; 49 (9):1011-1025.

Chicago/Turabian Style

A. A. Sukhanov; M. D. Mamedov; K. Möbius; A. Yu. Semenov; K. M. Salikhov. 2018. "The Decrease of the ESEEM Frequency of $${\text{P}}_{700}^{ + } {\text{A}}_{1}^{ - }$$ P 700 + A 1 - Ion-Radical Pair in Photosystem I Embedded in Trehalose Glassy Matrix at Room Temperature can be Explained by Acceleration of Spin–Lattice Relaxation." Applied Magnetic Resonance 49, no. 9: 1011-1025.

Article
Published: 15 February 2018 in European Journal of Organic Chemistry
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We discovered a new and unexpected substitution reaction of Bodipy. With single crystal XRD analysis, DFT calculations and other complimentary spectroscopic methods, we confirmed that the molecular structure assignment of the previously reported nucleophilic substitution at the halogated carbon atom at the meso-position of Bodipy was inaccurate. Indeed, in these substitution reactions, the attachment of the amino occurs at methyl group at 3- or 5-position, not on the meso- carbon position of the Bodipy core. With this unexpected substitution reaction, we prepared a Bodipy dimer, which is attached with a stable radical, TEMPO. Using this Bodipy-TEMPO triad, we confirmed the efficient triplet state formation (quantum yield 59%, lifetime = 2.8 microseconds) via the radical enhanced intersystem crossing mechanism, based on the nanosecond time-resolved transient absorption spectroscopy. With time-resolved EPR, the doublet state (spin angular momentum quantum number S = 1/2) and quartet state (S = 3/2) of the triad were observed. Moreover, we observed a strong intramolecular ground state interaction between the Bodipy chromophores in the triad, which gives new spectral features different from that of H- or J-aggregate and exciton coupling effect. These TEMPO labeled compounds were used as triplet photosensitizers for triplet-triplet-annihilation (TTA) upconversion (quantum yield = 4.7%).

ACS Style

Kejing Xu; Andrey A. Sukhanov; Yingjie Zhao; Jianzhang Zhao; Wei Ji; Xiaojun Peng; Daniel Escudero; Denis Jacquemin; Violeta K. Voronkova. Unexpected Nucleophilic Substitution Reaction of BODIPY: Preparation of the BODIPY-TEMPO Triad Showing Radical-Enhanced Intersystem Crossing. European Journal of Organic Chemistry 2018, 2018, 885 -895.

AMA Style

Kejing Xu, Andrey A. Sukhanov, Yingjie Zhao, Jianzhang Zhao, Wei Ji, Xiaojun Peng, Daniel Escudero, Denis Jacquemin, Violeta K. Voronkova. Unexpected Nucleophilic Substitution Reaction of BODIPY: Preparation of the BODIPY-TEMPO Triad Showing Radical-Enhanced Intersystem Crossing. European Journal of Organic Chemistry. 2018; 2018 (7):885-895.

Chicago/Turabian Style

Kejing Xu; Andrey A. Sukhanov; Yingjie Zhao; Jianzhang Zhao; Wei Ji; Xiaojun Peng; Daniel Escudero; Denis Jacquemin; Violeta K. Voronkova. 2018. "Unexpected Nucleophilic Substitution Reaction of BODIPY: Preparation of the BODIPY-TEMPO Triad Showing Radical-Enhanced Intersystem Crossing." European Journal of Organic Chemistry 2018, no. 7: 885-895.

Original paper
Published: 13 November 2017 in Applied Magnetic Resonance
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The results of the electron paramagnetic resonance (EPR) and transient EPR (TREPR) of copper complexes of coproporphyrin I in different solvents before and after the laser pulse photo-excitation have been presented. Continuous-wave EPR spectra of the CuCPP-1 complex in o-terphenyl indicate the presence of only monomer fragments, while in the solution of the chloroform and isopropanol mixture, the complexes dimerize and the amount of dimers is five times larger than that of monomer complexes. Parameters describing EPR spectra of monomer and dimer CuCPP-1 complexes have been determined. It was established that the fine structure tensor of the dimer complex is rotated with respect to the g-tensor, which coincides with the tensor of monomer complexes. TREPR spectra of CuCPP-1 complexes in o-terphenyl and in the chloroform and isopropanol mixture after the laser photo-excitation are mainly due to spin-polarized ground states of monomer and dimer complexes, respectively. The TREPR spectra of the monomer CuCPP-1 show the emissive spin-polarized signal of the ground state. For dimer fragments, the net polarization is observed in the form of absorption and there is a small contribution from the multiplet polarization, which decays fast in time. The time dependence of TREPR of CuCPP-1 complexes in the chloroform and isopropanol mixture is described with allowance for these contributions from the ground state of the dimer and the contribution from the ground state of the monomer, which is manifested at larger times. Differences in the spin polarization of ground states and their possible origin are discussed.

ACS Style

Andrey Sukhanov; Yu. E. Kandrashkin; V. K. Voronkova; V. S. Tyurin. Electron Spin Polarization of Photo-Excited Copper Coproporphyrin I: From Monomers to Dimers. Applied Magnetic Resonance 2017, 49, 239 -253.

AMA Style

Andrey Sukhanov, Yu. E. Kandrashkin, V. K. Voronkova, V. S. Tyurin. Electron Spin Polarization of Photo-Excited Copper Coproporphyrin I: From Monomers to Dimers. Applied Magnetic Resonance. 2017; 49 (3):239-253.

Chicago/Turabian Style

Andrey Sukhanov; Yu. E. Kandrashkin; V. K. Voronkova; V. S. Tyurin. 2017. "Electron Spin Polarization of Photo-Excited Copper Coproporphyrin I: From Monomers to Dimers." Applied Magnetic Resonance 49, no. 3: 239-253.

Original paper
Published: 11 September 2017 in Applied Magnetic Resonance
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Dimers of Cr3+ ions in compounds [Fe(phen)3][Cr2(OH)(Ac)(nta)2]·6,25H2O (I) and [Fe(bpy)3][Cr2(OH)(Ac)(nta)2]·8H2O (II), temperature dependences of the electron paramagnetic resonance (EPR) spectra of which in the range of 300–12 К are characteristic for dimers with strong antiferromagnetic exchange interaction are studied by the EPR method in the X-band. The anisotropy of the spin–spin interaction is estimated from fitting spectra corresponding to the multiplet with S = 2 to model spectra. It is shown that the tensor of the anisotropic spin–spin interaction considerably differs from that of the dipole–dipole contribution. Signals from the multiplet with S = 1 were also separated for the compound II that made it possible to estimate the fine structure parameter of the Cr3+ ion. Features of the variation of the integral intensity of EPR spectra are observed at temperatures below 6 К for I and 7 К for II, which are explained by the decrease in the value of the isotropic exchange between chromium ions in dimers. Only the intensity of spectrum changes and its shape is completely preserved.

ACS Style

L. V. Mingalieva; R. T. Galeev; Andrey Sukhanov; V. K. Voronkova; I. K. Budnikova; G. Novitchi. Features of Exchange Interaction Between Cr3+ Ions in Compounds [Fe(phen)3][Cr2(OH)(Ac)(nta)2]·6,25H2O and [Fe(bpy)3][Cr2(OH)(Ac)(nta)2]·8H2O. Applied Magnetic Resonance 2017, 49, 61 -69.

AMA Style

L. V. Mingalieva, R. T. Galeev, Andrey Sukhanov, V. K. Voronkova, I. K. Budnikova, G. Novitchi. Features of Exchange Interaction Between Cr3+ Ions in Compounds [Fe(phen)3][Cr2(OH)(Ac)(nta)2]·6,25H2O and [Fe(bpy)3][Cr2(OH)(Ac)(nta)2]·8H2O. Applied Magnetic Resonance. 2017; 49 (1):61-69.

Chicago/Turabian Style

L. V. Mingalieva; R. T. Galeev; Andrey Sukhanov; V. K. Voronkova; I. K. Budnikova; G. Novitchi. 2017. "Features of Exchange Interaction Between Cr3+ Ions in Compounds [Fe(phen)3][Cr2(OH)(Ac)(nta)2]·6,25H2O and [Fe(bpy)3][Cr2(OH)(Ac)(nta)2]·8H2O." Applied Magnetic Resonance 49, no. 1: 61-69.

Journal article
Published: 01 July 2017 in JETP Letters
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Paramagnetic centers formed by impurity Yb3+ ions in synthetic forsterite (Mg2SiO4) grown by the Czochralski technique are studied by X-band CW and pulsed EPR spectroscopy. These centers are single ions substituting magnesium in two different crystallographic positions denoted М1 and М2, and dimer associates formed by two Yb3+ ions in nearby positions М1. It is established that there is a pronounced mechanism favoring self-organization of ytterbium ions in dimer associates during the crystal growth, and the mechanism of the spin–spin coupling between ytterbium ions in the associate has predominantly a dipole–dipole character, which makes it possible to control the energy of the spin–spin interaction by changing the orientation of the external magnetic field. The structural computer simulation of cluster ytterbium centers in forsterite crystals is carried out by the method of interatomic potentials using the GULP 4.0.1 code (General Utility Lattice Program). It is established that the formation of dimer associates in the form of a chain parallel to the crystallographic axis consisting of two ytterbium ions with a magnesium vacancy between them is the most energetically favorable for ytterbium ions substituting magnesium in the position М1.

ACS Style

V. F. Tarasov; A. A. Sukhanov; V. B. Dudnikova; E. V. Zharikov; D. A. Lis; K. A. Subbotin. Dimer self-organization of impurity ytterbium ions in synthetic forsterite single crystals. JETP Letters 2017, 106, 92 -96.

AMA Style

V. F. Tarasov, A. A. Sukhanov, V. B. Dudnikova, E. V. Zharikov, D. A. Lis, K. A. Subbotin. Dimer self-organization of impurity ytterbium ions in synthetic forsterite single crystals. JETP Letters. 2017; 106 (2):92-96.

Chicago/Turabian Style

V. F. Tarasov; A. A. Sukhanov; V. B. Dudnikova; E. V. Zharikov; D. A. Lis; K. A. Subbotin. 2017. "Dimer self-organization of impurity ytterbium ions in synthetic forsterite single crystals." JETP Letters 106, no. 2: 92-96.

Original paper
Published: 10 May 2017 in Applied Magnetic Resonance
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Two Y2SiO5 single crystals doped with 0.001 at.% of the 143Nd3+ ion (sample I containing the only 28Si isotope) and (sample II with the natural abundance of silicon isotopes) were studied using magnetic resonance methods. The spin–spin and spin–lattice relaxation times were measured at 9.7 GHz between 4 and 10 K. It is established that three relaxation processes describe temperature dependences of the spin–lattice relaxation for both crystals. They are one-phonon, two-phonon Raman and two-phonon Orbach–Aminov relaxation processes. It is established that temperature dependence of spin–spin relaxation time differs for different hyperfine components of the electron paramagnetic resonance spectrum of neodymium ions and depends on the kind of the neodymium isotope (143Nd or 145Nd).

ACS Style

Andrey Sukhanov; V. F. Tarasov; R. M. Eremina; I. V. Yatsyk; R. F. Likerov; A. V. Shestakov; Yuri Zavartsev; A. I. Zagumennyi; S. A. Kutovoi. ESR Study of Y2SiO5:Nd143 Isotopically Pure Impurity Crystals for Quantum Memory. Applied Magnetic Resonance 2017, 48, 589 -596.

AMA Style

Andrey Sukhanov, V. F. Tarasov, R. M. Eremina, I. V. Yatsyk, R. F. Likerov, A. V. Shestakov, Yuri Zavartsev, A. I. Zagumennyi, S. A. Kutovoi. ESR Study of Y2SiO5:Nd143 Isotopically Pure Impurity Crystals for Quantum Memory. Applied Magnetic Resonance. 2017; 48 (6):589-596.

Chicago/Turabian Style

Andrey Sukhanov; V. F. Tarasov; R. M. Eremina; I. V. Yatsyk; R. F. Likerov; A. V. Shestakov; Yuri Zavartsev; A. I. Zagumennyi; S. A. Kutovoi. 2017. "ESR Study of Y2SiO5:Nd143 Isotopically Pure Impurity Crystals for Quantum Memory." Applied Magnetic Resonance 48, no. 6: 589-596.

Journal article
Published: 01 April 2017 in Physics of Metals and Metallography
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Variations in magnetic properties of the heavy-fermion YbNi2 alloy when milled in a high energy ball milling system have been investigated. The ferromagnetic transition (TC = 10.4 K) in the initial sample almost vanishes after milling, which leads to the appearance of a magnetic transition at T* = 3.2 K in nanocrystallites. Before milling, processes of spin–lattice relaxation of the Orbach–Aminov type with the participation of the first excited Stark sublevel of the Yb3+ ion located at 75 K are dominating in the electron spin dynamics in the paramagnetic phase of the alloy. A comparative study of the temperature dependence of the magnetic properties and spectra of electron paramagnetic resonance in poly- and nanocrystalline samples indicates the existence of a magnetic inhomogeneity of the compound arising upon milling.

ACS Style

V. A. Ivanshin; E. M. Gataullin; Andrey Sukhanov; D. P. Rojas; Luis Fernandez Barquin. Magnetic behavior of the nanophase of YbNi2 alloys. Physics of Metals and Metallography 2017, 118, 341 -345.

AMA Style

V. A. Ivanshin, E. M. Gataullin, Andrey Sukhanov, D. P. Rojas, Luis Fernandez Barquin. Magnetic behavior of the nanophase of YbNi2 alloys. Physics of Metals and Metallography. 2017; 118 (4):341-345.

Chicago/Turabian Style

V. A. Ivanshin; E. M. Gataullin; Andrey Sukhanov; D. P. Rojas; Luis Fernandez Barquin. 2017. "Magnetic behavior of the nanophase of YbNi2 alloys." Physics of Metals and Metallography 118, no. 4: 341-345.

Original paper
Published: 12 November 2016 in Applied Magnetic Resonance
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The DyIII ions in the dimer [Dy2(H2tea)2(O2CPh)4]·2H2O (1) (H3tea = triethanolamine) have the 9-coordinate monocapped square-antiprismatic ligand field environment. Compound 1 shows slow relaxation of magnetization which is observable only with applied magnetic fields. This is consistent with the idea that low-symmetry ligand fields allow for the quantum tunneling of magnetization. This is reflected by the fact that there are no observable maxima in the out-of-phase ac susceptibility above 1.8 K. The {g}-tensor of the DyIII ions {g x = 11, g y = 8.2, g z = 1} further underlying the reduced uniaxiality in this system was determined in electron paramagnetic resonance (X- and Q-band) studies of 1 at temperatures down to 4 K.

ACS Style

Amer Baniodeh; Abhishake Mondal; Ravil Galeev; Andrey Sukhanov; Rushana Eremina; Violeta Voronkova; Christopher Anson; Annie Powell. How Far can the Anisotropy Deviate from Uniaxiality in a Dy-Based Single-Molecule Magnet? Dinuclear Dy(III) Complex Study. Applied Magnetic Resonance 2016, 48, 101 -113.

AMA Style

Amer Baniodeh, Abhishake Mondal, Ravil Galeev, Andrey Sukhanov, Rushana Eremina, Violeta Voronkova, Christopher Anson, Annie Powell. How Far can the Anisotropy Deviate from Uniaxiality in a Dy-Based Single-Molecule Magnet? Dinuclear Dy(III) Complex Study. Applied Magnetic Resonance. 2016; 48 (1):101-113.

Chicago/Turabian Style

Amer Baniodeh; Abhishake Mondal; Ravil Galeev; Andrey Sukhanov; Rushana Eremina; Violeta Voronkova; Christopher Anson; Annie Powell. 2016. "How Far can the Anisotropy Deviate from Uniaxiality in a Dy-Based Single-Molecule Magnet? Dinuclear Dy(III) Complex Study." Applied Magnetic Resonance 48, no. 1: 101-113.

Journal article
Published: 01 October 2016 in Bioorganic Chemistry
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Rice allene oxide synthase-1 mutants carrying F92L, P430A or F92L/P430A amino acid substitution mutations were constructed, recombinant mutant and wild type proteins were purified and their substrate preference, UV-vis spectra and heme iron spin state were characterized. The results show that the hydroperoxide lyase activities of F92L and F92L/P430A mutants prefer 13-hydroperoxy substrate to other hydroperoxydienoic acids or hydroperoxytrienoic acids. The Soret maximum was completely red-shifted in P430A and F92L/P430A mutants, but it was partially shifted in the F92L mutant. ESR spectral data showed that wild type, F92L and P430A mutants occupied high and low spin states, while the F92L/P430A mutant occupied only low spin state. The extent of the red shift of the Soret maximum increased as the population of low spin heme iron increased, suggesting that the spectral shift reflects the high to low transition of heme iron spin state in rice allene oxide synthase-1. Relative to wild type allene oxide synthase-1, the hydroperoxide lyase activities of F92L and F92L/P430A are less sensitive to inhibition by imidazole with (13S or 9S)-hydroperoxydienoic acid as substrate and more sensitive than wild type with (13S)-hydroperoxytrienoic acid as substrate. Our results suggest that hydroperoxydienoic acid is the preferred substrate for the hydroperoxide lyase activity and (13S)-hydroperoxytrienoic acid is the preferred substrate for allene oxide synthase activity of allene oxide synthase-1.

ACS Style

Sereyvath Yoeun; Andrey Sukhanov; Oksoo Han. Separation of enzymatic functions and variation of spin state of rice allene oxide synthase-1 by mutation of Phe-92 and Pro-430. Bioorganic Chemistry 2016, 68, 9 -14.

AMA Style

Sereyvath Yoeun, Andrey Sukhanov, Oksoo Han. Separation of enzymatic functions and variation of spin state of rice allene oxide synthase-1 by mutation of Phe-92 and Pro-430. Bioorganic Chemistry. 2016; 68 ():9-14.

Chicago/Turabian Style

Sereyvath Yoeun; Andrey Sukhanov; Oksoo Han. 2016. "Separation of enzymatic functions and variation of spin state of rice allene oxide synthase-1 by mutation of Phe-92 and Pro-430." Bioorganic Chemistry 68, no. : 9-14.

Original paper
Published: 08 September 2016 in Applied Magnetic Resonance
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The short-lived states of the photoexcited conjuncted porphyrin trimer, in which two side zinc porphyrin fragments differ from the central fragment, have been studied by time-resolved continuous-wave and pulse electron paramagnetic resonance (EPR) in X- and Q-bands. It was shown that the observed spectra are the sum of the spectra of two types of porphyrin components. This was particularly evident in the echo-detected spectra at the relatively large time delay between echo-forming microwave pulses when not all the signals were detected due to the anisotropy of phase relaxation times of porphyrin systems. The parameters of the excited triplet states were determined and it was shown that the two types of excited triplet states were characterized by the same values of the g-factors but different values of the zero-field splitting. The anisotropy of the g-tensors of triplet states was estimated from the frequency dependence of the EPR spectra.

ACS Style

Andrey Sukhanov; Liudmila Savostina; V. K. Voronkova; E. A. Mikhalitsyna; V. S Tyurin. Time-Resolved and Pulse EPR Study of Conjuncted Porphyrin Trimer. Applied Magnetic Resonance 2016, 47, 1295 -1304.

AMA Style

Andrey Sukhanov, Liudmila Savostina, V. K. Voronkova, E. A. Mikhalitsyna, V. S Tyurin. Time-Resolved and Pulse EPR Study of Conjuncted Porphyrin Trimer. Applied Magnetic Resonance. 2016; 47 (11):1295-1304.

Chicago/Turabian Style

Andrey Sukhanov; Liudmila Savostina; V. K. Voronkova; E. A. Mikhalitsyna; V. S Tyurin. 2016. "Time-Resolved and Pulse EPR Study of Conjuncted Porphyrin Trimer." Applied Magnetic Resonance 47, no. 11: 1295-1304.

Article
Published: 11 July 2016 in Applied Magnetic Resonance
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A specially synthesized nitroxide biradical R6-13C≡C-p-C6H4–C≡13C-R6, B3, where R6 = 1-oxyl-2,2,6,6-tetramethyl-1,2,3,6-tetrahydropyridine nitroxide, has been studied by electron paramagnetic resonance spectroscopy, and electron-nuclear double resonance (ENDOR). Spin density distribution and hyperfine splitting (hfs) constant on 13C atoms calculations for biradical B3 were carried out using B3LYP and PBE0 functionals and several different basis sets including N07 family and were compared with the experimental value of the hfs constant on 13C atoms, measured from ENDOR spectra of B3. The mechanism of the intramolecular electron spin exchange in B3 biradical is discussed.

ACS Style

A. I. Kokorin; R. B. Zaripov; O. I. Gromov; A. A. Sukhanov; T. Kálai; É. Lamperth; K. Hideg. Spin Density Distribution in a Nitroxide Biradical Containing 13C-Enriched Acetylene Groups in the Bridge: DFT Calculations and EPR Investigation. Applied Magnetic Resonance 2016, 47, 1057 -1067.

AMA Style

A. I. Kokorin, R. B. Zaripov, O. I. Gromov, A. A. Sukhanov, T. Kálai, É. Lamperth, K. Hideg. Spin Density Distribution in a Nitroxide Biradical Containing 13C-Enriched Acetylene Groups in the Bridge: DFT Calculations and EPR Investigation. Applied Magnetic Resonance. 2016; 47 (9):1057-1067.

Chicago/Turabian Style

A. I. Kokorin; R. B. Zaripov; O. I. Gromov; A. A. Sukhanov; T. Kálai; É. Lamperth; K. Hideg. 2016. "Spin Density Distribution in a Nitroxide Biradical Containing 13C-Enriched Acetylene Groups in the Bridge: DFT Calculations and EPR Investigation." Applied Magnetic Resonance 47, no. 9: 1057-1067.