EPR Spectra of the Genuine-Organic and Metal-Organic TCNQ-Based Anion Radical Salts

M. Botko, E. Čižmár, M. Kajňaková, A. Feher Institute of Physics, Faculty of Science, P. J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia

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We have measured the electron paramagnetic resonance spectra of genuine-organic anion-radical salts [Me-2,6-di-Me-Py](TCNQ)2, [Me-3,5-di-Me-Py](TCNQ)2, [N-Me-OH-Me-Py](TCNQ)2, [N-Et-OH-Me-Py](TCNQ)2, and metal-organic anion-radical salt [Mn-phen3](TCNQ)2·H2O in the temperature range from 2 K to 300 K in the X-band frequency range. A comparison study of the shape of spectra, g-factors and linewidths with respect to the composition and crystal structure of studied compounds is presented. While the genuine-organic anion-radical salts display a typical EPR response originating from TCNQ pairs, the spectra of metal-organic anion-radical salt are dominated by the contribution of transition metal.

DOI: 10.12693/APhysPolA.126.252 PACS numbers: 75.50.Xx, 76.30.-v