Temperature Dependence ofĝ Tensor Anisotropy in (tm-p-PD):Chloranil, Charge Transfer Complex Powders
G. Gramppa, P.B. Sczanieckib, S. Żurekb and W. Bednarskic
aInstitute of Physical and Theoretical Chemistry, Graz University of Technology, Technickerstrasse 4, 8010 Graz, Austria
bInstitute of Physics, University of Zielona Góra, Szafrana 4a, 65-516 Zielona Góra, Poland
cInstitute of Molecular Physics, Polish Academy of Science, Smoluchowskiego 17, 60-179 Poznań, Poland
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Received: 24 04 2005;
The powders of 2,3,5,6-tetramethyl-p-phenylenediamine:chloranil charge transfer complex were studied by EPR. Numerical pack EPR-NMR was used to simulate and fit the X-band experimental data in the temperature range of 119-298 K. Very good agreement between the experiment and simulations permits to obtain the main values ofĝ matrix and plot their temperature dependence. At 150 K the main g values are gxx=gyy=2.0041 and gzz=2.0015. g splitting factor varies significantly with temperature and shows an anomaly near 200 K. The signal narrows with the temperature increase, which agrees with the earlier observation. Individual component linewidth, used in the simulation is anisotropic and amounts to 0.1-0.8 mT; which is reasonable when compared with those measured earlier for the single crystals of p-phenylenediamine:chloranil, where the narrowest lines are quoted to be 18 μT.
DOI: 10.12693/APhysPolA.108.317
PACS numbers:76.30.Rn