Dr. Muhammad S. Khan

Department of Chemistry, Sultan Qaboos University, Al-Khod 123, Oman

Dr. Muhammad S. Khan

Department of Chemistry, Sultan Qaboos University, Al-Khod 123, Oman

Co-authors

Following

Followers

Research Focus & Metrics

Explore full metrics on Scilit

Academic Career Length

43Years (1984-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

View All Publications

24 August 2001 in Journal of the American Chemical Society

Journal Article

The Energy Gap Law for Triplet States in Pt-Containing Conjugated Polymers and Monomers

Joanne S. Wilson

Nazia Chawdhury

Muna R. A. Al-Mandhary

M. Younus

Muhammad S. Khan

Richard H. Friend

1 October 2001 in Nature

Journal Article

Spin-dependent exciton formation in π-conjugated compounds

J. S. Wilson

A. S. Dhoot

A. J. A. B. Seeley

Muhammad S. Khan

A. Köhler

R. H. Friend

10 November 2005 in Physical Review B

Journal Article

Large magnetoresistance in nonmagnetic

π

-conjugated semiconductor thin film devices

ÖM

Ö. Mermer

G. Veeraraghavan

T. L. Francis

Y. Sheng

D. T. Nguyen

Muhammad S. Khan

Following the recent observation of large magnetoresistance at room temperature in polyfluorene sandwich devices, we have performed a comprehensive magnetoresistance study on a set of organic semiconductor sandwich devices made from different

π

-conjugated polymers and small molecules. The study includes a range of materials that show greatly different chemical structure, mobility, and spin-orbit coupling strength. We study both hole and electron transporters at temperatures ranging from 10 K to 300 K. We observe large negative or positive magnetoresistance (up to 10% at 300 K and 10 mT) depending on material and device operating conditions. We discuss our results in the framework of known magnetoresistance mechanisms and find that none of the existing models can explain our results.

3 January 2023 in Chemical Society Reviews

Journal Article

Non-covalent interactions (NCIs) in π-conjugated functional materials: advances and perspectives

Khalaf M. Alenezi

The design and development of functional materials with real-life applications are highly demanding. Understanding and controlling inter- and intra-molecular interactions provide opportunities to design new materials. A judicious manipulation of the molecular structure significantly alters such interactions and can boost selected properties and functions of the material. There is burgeoning evidence of the beneficial effects of non-covalent interactions (NCIs), showing that manipulating NCIs may generate functional materials with a wide variety of physical properties leading to applications in catalysis, drug delivery, crystal engineering, etc. This prompted us to review the implications of NCIs on the molecular packing, optical properties, and applications of functional π-conjugated materials. To this end, this tutorial review will cover different types of interactions (electrostatic, π-interactions, metallophilic, etc.) and their impact on π-conjugated materials. Attempts have also been made to delineate the effects of weak interactions on opto-electronic (O-E) applications.

25 February 1999 in The Journal of Chemical Physics

Journal Article

Evolution of lowest singlet and triplet excited states with number of thienyl rings in platinum poly-ynes

N. Chawdhury

A. Köhler

R. H. Friend

Wai-yeung Wong

J. Lewis

Muhammad S. Khan

Soluble, rigid-rod organometallic polymers trans-

[- Pt ({PBu}_{3}^{n})_{2} - C≡C–R–C≡C {–]}_{\infty}

(

R=bithienyl

2, terthienyl 3) have been synthesized in good yields by the CuI-catalyzed dehydrohalogenation reaction of trans-

[Pt ({PBu}_{3}^{n})_{2} {Cl}_{2}]

with one equivalent of the diterminal alkynyl oligothiophenes

H–C≡C–R–C≡C–H

{CH}_{2} {Cl}_{2} /^{i} \Pr_{2} NH

at room temperature. We report the thermal properties, and the optical absorption, photoluminescence, and photocurrent action spectra of 1 (trans-

[– Pt ({PBu}_{3}^{n})_{2} - C≡C–R–C≡C {–]}_{\infty},

R=thienyl

), 2 and 3 as a function of the number of thiophene rings within the bridging ligand. With increasing thiophene content, the optical gap is reduced and the vibronic structure of the singlet emission changes toward that typical for oligothiophenes. We also find the intersystem crossing from the singlet excited state to the triplet excited state to become reduced, while the singlet–triplet energy gap remains unaltered. The latter implies that, in these systems, the

T_{1}

triplet excited state is extended over several thiophene rings. The photoconducting properties do not depend on the size of the thiophene fragment. We discuss and compare our results with studies on oligothiophenes and related organometallic polymers.

1 April 2017 in Bioorganic & Medicinal Chemistry

Journal Article

Next generation NIR fluorophores for tumor imaging and fluorescence-guided surgery: A review

Ashanul Haque

Md Serajul Haque Faizi

Jahangir Ahmad Rather

Muhammad S. Khan

About Me

Prof. Muhammad S. Khan was an 1851 Exhibition Scholar and received his Ph.D. in 1983 from the University of Cambridge, U.K. Currently he is a Professor of Inorganic Chemistry at the Sultan Qaboos University, Sultanate of Oman. Formerly he was a Professor of Chemistry at the University of Dhaka, Bangladesh, a Visiting Professor in the Department of Chemistry, University of Bath and the University Chemical Laboratory, University of Cambridge (UK), and a Visiting Fellow in the Cavendish Laboratory, University of Cambridge. Prof. Khan has received many medals and awards, notably, the H.P. Ray Gold Medal of the University of Dhaka (1986), Junior Gold Medal of the Bangladesh Academy of Science (1994), the Best Researcher Award, College of Science, SQU (2005, 2017), the National Research Award, The Research Council, Oman (2018), and the Most Active Research Group Award, Deanship of Research, SQU (2020). His research interests include the design and development of novel functional materials such as conjugated organic and organometallic polymers, metal organic frameworks and lanthanide coordination complexes for sustainable energy applications. Prof. Khan is the Editor-in-Chief of the SQU Journal for Science and an Editorial Board Member of the MDPI journal Polymers. He is a Fellow of the Royal Society of Chemistry.

Dr. Muhammad S. Khan

Dr. Muhammad S. Khan

Research Focus & Metrics

Academic Career Length

Publication Type Breakdown

Representative Publications

About Me