Abstract
Electron paramagnetic resonance (EPR) spectra of nonmetallic amorphous polyphthalocyanines are investigated in the temperature range 295–500 K. The EPR spectrum of nonmetallic amorphous polyphth-alocyanine samples at room temperature prior to heating is a narrow singlet of approximately Lorentzian shape with a linewidth ΔH pp ≈ 1.7 Oe, a splitting factor g=2.00, and an intensity I EPR ≈ 1017 spins/g. It is found that the intensity and linewidth of the EPR spectrum increase with increasing temperature. Beginning with a characteristic temperature T 1, both parameters, ΔH pp and I EPR, become dependent on time (under isothermal conditions). Computer calculations of the spectra demonstrate that the EPR spectrum can be represented as a superposition of two lines with substantially differing parameters whose dependences on the temperature and micro-wave power also differ significantly. The possible reasons for the existence of electron paramagnetic resonance centers of two types with different degrees of delocalization of a charge carrier with a magnetic moment in nonmetallic amorphous polyphthalocyanines are discussed.
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Translated from Fizika Tverdogo Tela, Vol. 46, No. 7, 2004, pp. 1316–1323.
Original Russian Text Copyright © 2004 by Koksharov, Sherle.
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Koksharov, Y.A., Sherle, A.I. Paramagnetic centers in nonmetallic amorphous polyphthalocyanines. Phys. Solid State 46, 1357–1364 (2004). https://doi.org/10.1134/1.1778464
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DOI: https://doi.org/10.1134/1.1778464