THE INFLUENCE OF AXIALLIGANDS ON THE ELECTRONIC ABSORPTION SPECTRA OF PHTHALOCYANINATOIRON(Ⅱ)

Axial ligation in solution by phthalocyaninatolron(Ⅱ)with a varicty of donor ligandshas been widely investigated by measuring the visible spectral changes.It has been foundthat the axial ligation does not influence the Q_ο-οband so much as the Ⅱ-band,the appearance and the red shift of the latter under the action of σ-donation of ligands could be attri-buted to the Charge transfer from the metal d-orbital toward e_σ(π)orbital of PC-ring:e_g(dπ)M→Cg(π)Pc.A linear relation was found to exist between the energy of Q_ο-οand that of Ⅱ-band of ligands containing the same donor atoms(O,N,S,).This may be corre-lated with the electronegativity of donoratoms.

Axial ligation in solution by phthalocyaninatoiron(II) with a variety of dondr ligands has been widely investigated by measuring the visible spectral changes. It has been found that the axial ligation does not influence the Q0-0 band so much as the II-band, the appearance and the red shift of the latter under the action of σ-donation of ligands could be attributed to the charge transfer from the metal d-orbital toward eg(π*) orbital of Pc-ring: eg (dπ)M→eg(π* )Pc. A linear relation was found to exist between the energy of Q0-0 and that of II-band of ligands containing the same donor atoms (O, N, S, ) .This may be correlated with the electronegativity of donor atoms.