A novel neutral complex [Fe^III(Hsemsal)(semsal)]·3H₂O was synthesized and its magnetic properties, and crystal and electronic structures were studied.

In this study, crystals of the hybrid layered structure, combined with Fe(III) Spin-Crossover (SCO) complexes with metal-dithiolate anionic radicals, and the precursors with nitrate and iodine counterions, are obtained and characterized. [Fe(III)(3-OMe-Sal₂trien)][Ni(dmit)₂] (1), [Fe(III)(3-OMe-Sal₂trien)]NO₃·H₂O (2), [Fe(III)(3-OMe-Sal₂trien)]I (3) (3-OMe-Sal₂trien = hexadentate N₄O₂ Schiff base is the product of the condensation of triethylenetetramine with 3-methoxysalicylaldehyde; H₂dmit = 2-thioxo-1,3-dithiole-4,5-dithiol). Bulk SCO transition was not achieved in the range 2.0–350 K for all three compounds. Alternatively, the hybrid system (1) exhibited irreversible segregation into the spatial fractions of Low-Spin (LS) and High-Spin (HS) phases of the ferric moiety, induced by thermal cycling. Fractioning was studied using both SQUID and EPR methods. Magnetic properties of the LS and HS phases were analyzed in the framework of cooperative interactions with anionic sublattice: Anion radical layers Ni(dmit)₂ (1), and H-bonded chains with NO₃ and I (2,3). LS phase of (1) exhibited unusual quasi-two-dimensional conductivity related to the Arrhenius mechanism in the anion radical layers, ρ_||c = 2 × 10⁵ Ohm·cm and ρ_⊥c = 7 × 10² Ohm·cm at 293 K. Ground spin state of the insulating HS phase was distinctive by ferromagnetically coupled spin pairs of HS Fe³⁺, S = 5/2, and metal-dithiolate radicals, S = 1/2.

Hybrid ion-pair crystals involving hexadentate [Fe(III)(3-OMesal₂-trien)]⁺ spin-crossover (SCO) cationic complexes and anionic gold complexes [Au(dmit)₂]⁻ (1) (dmit = 4,5-dithiolato-1,3-dithiole-2-thione) and [Au(dddt)₂]⁻ (2) (dddt = 5,6-dihydro-1,4-dithiin-2,3-dithiolate) were synthesized and studied by single-crystal X-ray diffraction, P-XRD, and SQUID magnetometry. Our study shows that both complexes have similar 1:1 stoichiometry but different symmetry and crystal packing. Complex 1 has a rigid structure in which the SCO cations are engaged in strong π-interplay with molecular surrounding and does not show SCO transition while 2 demonstrates a reversible transition at T_sco = 118 K in a much “softer”, hydrogen-bonded structure. A new structural indicator of spin state in [Fe(sal₂-trien)]⁺ complexes based on conformational analysis has been proposed. Aging and thermocycling ruined the SCO transition increasing the residual HS fraction from 14 to 41%. Magnetic response of 1 is explained by the AFM coupled dimers S = 5/2 with J₁ = −0.18 cm⁻¹. Residual high-spin fraction of 2, apart from a contribution of the weak dimers with J₁₂ = J₃₄ = −0.29 cm⁻¹, is characterized by a stronger interdimer coupling of J₂₃ = −1.69 cm⁻¹, which is discussed in terms of possible involvement of neutral radicals [Au(dddt)₂].

552 The interest in nanocarbon materials (NCMs) is in particular due to their use in photovoltaic (PV) materials in the form of composites with conjugated polymers (CPs). The working layer of a PV device consists of conductive interpenetrating donor‐acceptor molecular networks, where a CP appears as a donor (D) and nanocarbon material as an electron acceptor (A) [1]. In our work, nanocarbon materials such as C 60 , C 120 , azahomo[60]fullerenes, metanofullerenes, (4‐6)poly(amino)[60]fullerenes, and single-wall carbon nanotubes (SWNTs) have been synthesized and investigated. The results of the study of the fluorescence quenching and current-voltage characteristics of model solar cells have shown that the test NCMs can be used as acceptors in polymer solar cells of the bulk-heterojunction

A series of azahomofullerenes and poly(amino)fullerenes were synthesized. Photoluminescence (PL) and photovoltaic (PV) measurements were performed on the composite films of conjugated polymer MEH‐PPV with fullerene derivatives to investigate the influence of an electron acceptor on the charge‐transfer process between components of PV system. We found that the PL of MEH‐PPV is strongly quenched by the admixture of the fullerene derivative. The efficiency in the PV device containing the blend MEH‐PPV/azahomofullerene is two orders of magnitude higher than in pure MEH‐PPV.