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The powders of 2,3,5,6-tetramethyl-p-phenylonediamine: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 of matrix and plot their temperature dependence. At 150 K the main g values are g(xx) = g(yy) = 2.0041 and g(zz) = 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 mu T.

Temperature Dependence ofĝ Tensor Anisotropy in (tm-p-PD):Chloranil Charge Transfer Complex Powders