Spin probe orientation distribution functions in aligned nematic liquid crystal
Abstract
Orientation distribution functions of nitroxide spin probe in nematic liquid crystal 5CB embedded into porous polyethylene film were determined at 295 K and at 77 K by numerical simulation of electron paramagnetic resonance (EPR) spectra. The procedure of simulation of EPR spectra at 77 K in the absence of molecular mobility of spin probe molecules allows determination of non-equilibrium orientational distribution function in supercooled liquid crystals. The suggested procedure yields an orientation distribution function of orientational axis of a spin probe molecule. Orientation distribution functions for the sample at 295 K and 77 K were found to be similar.
Keywords
spin probe method,
orientation distribution function,
EPR spectra angular dependence,
aligned liquid crystals,
numerical simulation,
spectrum fitting
Supporting agencies: This work was supported by the Russian Foundation for Basic Research, grants No. 09-03-00900 and 09-03-12234-ofi_m.
About the Authors
T. S. Yankova
Department of Chemistry, Lomonosov Moscow State University
Russian Federation
Russian Federation
Leninskie gory, 1/3, Moscow 119991
N. A. Chumakova
Department of Chemistry, Lomonosov Moscow State University
Russian Federation
Russian Federation
Leninskie gory, 1/3, Moscow 119991
D. A. Pomogailo
Department of Chemistry, Lomonosov Moscow State University
Russian Federation
Russian Federation
Leninskie gory, 1/3, Moscow 119991
A. Kh. Vorobiev
Department of Chemistry, Lomonosov Moscow State University
Russian Federation
Russian Federation
Leninskie gory, 1/3, Moscow 119991
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Review
For citations:
Yankova T.S., Chumakova N.A., Pomogailo D.A., Vorobiev A.Kh. Spin probe orientation distribution functions in aligned nematic liquid crystal. Magnetic Resonance in Solids. 2011;13(2):10-13.
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