New aspects of the chemistry of transition metal phthalocyanines

Electron variability and complex formation of transition metal phthalocyanine are discussed. Under proper conditions the well-known metal(n) phthalocyanines MPc (M = Cr, Mn, Fe, Co, Ni, Cu, Zn) can take up four or, in two cases, five electrons. To elucidate the electronic structure of the isolated anionic complexes LiMPc m THF a simple LCAO—MO model was derived which proved well suited to the interpretation of the chemical constituton of the various transition metal phthalocyanines. Properties like the oxidation potential, different muitiplicities between isoelectronic species (e.g. manganese and iron pbtbalocyanines and the Mossbauer spectra of iron phthalocyanines are explained. Further, preparation and properties of metal(m) phthalocyanines, complex formation of netal(ii phthalocyanines with pyridine and tetrahydrofuran and of iron(ii) phthalocyanine with amines and various it acid ligands. and the formation of a organyl transition metal phthalocyanines are treated.