Magnetic and optical properties of one-dimensional π–d system with axially substituted iron(III) phthalocyanine

We have measured the angular dependence of the ESR spectra on DMDP[FeIII0.01CoIII0.99(Pc)(CN)2] (DMDP=dimethyldiphenylphosphonium, Pc=phthalocyanine), which is the alloy system of magnetic FeIII and non-magnetic CoIII. The spectra exhibit giant anisotropic shift in g-value of iron(III). We also report the temperature dependence of the polarized reflectance spectra of one-dimensional conductors, TPP[FeIII(Pc)(CN)2]2 and TPP[CoIII(Pc)(CN)2]2 (TPP=tetraphenylphosphonium). With lowering the temperature, the plasma edge drastically shifts to a higher wavenumber in both salts.