Optical Spectra of Phthalocyanine Salts

Polarized reflection spectra are measured in the spectral region of 600–30000 cm−1 on the single crystals of the charge-transfer salts of phthalocyanine, CoxNi1−xPc(AsF6)0.5 (x=0, 0.33, 0.5, 1). In spite of the same band filling and isomorphous crystal structure, the reflectance spectra of CoPc(AsF6)0.5 is quite different from all other compounds. The temperature dependence of the optical conductivity spectrum of NiPc(AsF6)0.5 is discussed in relation to the coupling with molecular vibrations.