Adsorption of NO and pyridine by various metal phthalocyanines studied by X-ray photoelectron spectroscopy and gravimetry

Abstract

Axial coordination of nitrogen containing molecules to metal phthalocyanines (MPc) was studied by means of X-ray photoelectron spectroscopy (X.p.s.) and a gravimetric method. Coordination of pyridine to FePc and MnPc is mainly due to the stabilization of the 3d bonding orbitals by changing their ligand field. Coordination of NO to FePc, CoPc and MnPc is accompanied by chemical shifts of electron binding energies of the central metal atoms, indicating appreciable electron transfer between the central metal and NO. It appears that the nature of the coordinative bond critically depends upon the properties of the metals as well as those of the adsorbates.