caa a22 4500 475759028 CHVBK 20180406123545.0 cr unu---uuuuu 170329e20000601xx s 000 0 eng 10.1007/BF02494894 doi (NATIONALLICENCE)springer-10.1007/BF02494894 Models of slow rotational mobility of paramagnetic probes in glassy media [Elektronische Daten] [A. Vorob'ev, V. Gurman, T. Klimenko] Experimental ESR spectra of the 2,2,6,6-tetramethyl-4-oxopiperidinoxyl (TEMPON) radical probe in the glycerol, polystyrene, and polyvinylbutyral matrices measured in the temperature range 77-373 K were quantitatively compared with the ESR spectra calculated using the known theoretical models of rotational mobility. It was shown that simulation of ESR spectra by the nonlinear least-squares method is an efficient procedure for discriminating between theoretical models. The temperature ranges were determined in which it is possible to achieve quantitative agreement between experimental and theoretical spectra as well as the ranges in which theoretical models are insufficient to quantitatively describe the experimental results. It was established that the widely used model of Brownian diffusion in isotropic medium is inadequate to describe the ESR spectra in the case of slow motions of small probe molecules. It was found that specific interactions (formation of weak complexes) between the probe molecules and the molecules of the medium results in strongly anisotropic molecular rotational motions. Kluwer Academic/Plenum Publishers, 2000 ESR spectroscopy nationallicence radical probes nationallicence nitroxyl radicals nationallicence molecular mobility nationallicence simulation of ESR spectra by the nonlinear least-squares method nationallicence glassy media nationallicence glycerol nationallicence polystyrene nationallicence polyvinylbutyral nationallicence Vorob'ev A. Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory, 119899, Moscow, Russian Federation aut Gurman V. Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory, 119899, Moscow, Russian Federation aut Klimenko T. Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory, 119899, Moscow, Russian Federation aut Russian Chemical Bulletin Kluwer Academic Publishers-Plenum Publishers 49/6(2000-06-01), 1059-1067 1066-5285 49:6<1059 2000 49 11172 https://doi.org/10.1007/BF02494894 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02494894 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Vorob'ev A. Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory, 119899, Moscow, Russian Federation aut NATIONALLICENCE 700 1- Gurman V. Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory, 119899, Moscow, Russian Federation aut NATIONALLICENCE 700 1- Klimenko T. Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory, 119899, Moscow, Russian Federation aut NATIONALLICENCE 773 0- Russian Chemical Bulletin Kluwer Academic Publishers-Plenum Publishers 49/6(2000-06-01), 1059-1067 1066-5285 49:6<1059 2000 49 11172 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer