Slow molecular motion of different spin probes in a model glycerol—water matrix studied by double modulation ESR

The slow molecular motion of several deuterated and undeuterated spin probes differing in size and shape, embedded in a model glycerol—water matrix, have been studied by double-modulated electron spin resonance (DMESR). The DMESR spectra as a function of temperature reveal two motional regions. From...

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Bibliographic Details
Published in:Chemical physics letters 1992-11, Vol.199 (6), p.609-614
Main Authors: Valić, S., Rakvin, B., Veksli, Z., Pečar, S.
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Electron resonance and relaxation
Exact sciences and technology
Molecular properties and interactions with photons
Physics
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Summary:The slow molecular motion of several deuterated and undeuterated spin probes differing in size and shape, embedded in a model glycerol—water matrix, have been studied by double-modulated electron spin resonance (DMESR). The DMESR spectra as a function of temperature reveal two motional regions. From the experimental linewidths of both deuterated and undeuterated spin probes in the lower temperature region and simulated data based on the variation of T 1 relaxation, two different dynamics of the −CH 3 groups attached to piperidine ring were resolved. Our results indicate that the onset of the whole spin probe motion depends on the type of probe and the matrix density.
ISSN:0009-2614
1873-4448
DOI:10.1016/0009-2614(92)85018-6