Paramagnetic centers in nonmetallic amorphous polyphthalocyanines |
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Authors: | Yu A Koksharov A I Sherle |
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Institution: | (1) Moscow State University, Vorob’evy gory, Moscow, 119992, Russia;(2) Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 117977, Russia |
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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 ΔHpp ≈ 1.7 Oe, a splitting factor g=2.00, and an intensity IEPR ≈ 1017 spins/g. It is found that the intensity and linewidth of the EPR spectrum increase with increasing temperature. Beginning with a characteristic temperature T1, both parameters, ΔHpp and IEPR, 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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