Abstract
A conducting crystal of (phthalocyaninato)cobalt hexafluoroarsenate CoPc(AsF6)0.5 is prepared by an electrochemical method. Temperature-dependent electrical conductivity of dc and 9.4 GHz shows that CoPc(AsF6)0.5 is a narrow-gap semiconductor with activation energies of 327 K for dc and 138 K for 9.4 GHz. Thermoelectric power is +40 μV/K - +50μV/K in the range 100–300 K. The sign of the thermoelectric power is consistent with our earlier spectroscopic result that Pc ring is mainly oxidized contrary to the analogous material CoPcI. Optical spectrum along the c axis exhibits strong and weak peaks at 0.29 eV and 1.2 eV. Magnetic susceptibility is composed of a Curie-Weiss part with C = 0.056 emu mol−1 and a nearly temperature-independent part with the magnitude of 5 × D−4 emu/mol/ All these data indicates the localizaion of holes (U>4t) like in (TMTTF)2X and Ag(DMe-DCNQI)2. This localization seems to be related to the exchange interaction between the unpaired d-electron on Co and the π-electron on macrocyclic ligand.
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