Metal and core electron binding energies of the metalfocenes of the first row transition metals are reported and discussed with the aid of approximate molecular orbital calculations. In all cases it is found that the metal atom is positively charged. The measured splitting of the metal 3s photoelectron peaks is interpreted in terms of spin delocalization in these molecules.

The X-ray photoelectron (ESCA) spectra of a series of bis(arene)-and arene(tricarbony1)-metal complexes have been measured in the solid state. The binding energies have been interpreted as far as possible with the aid of ab initio SCF MO calculations of [(7pC6H6)Cr(C0)3] and [(q-C6H&Cr] and semi-empirical molecular orbital calculations on most of the other compounds. The arene ring bears a small negative charge in neutral bis(arene) complexes. The arene ring in an arene(triwbony1) complex has a lower electron density than in a comparable bis(arene) complex. There is no experimental evidence for the dependence of charge density upon the size of an arene ring.

The He(I), He(II) and X-ray photoelectron spectra of iron tricarbonyl butadiene are reported and these measurements, together with the bonding in the complex, are discussed with the aid of ab initio SCF MO calculations. The latter yield a substantial negative charge on the butadiene ligand, and the low energy photoelectron spectra can only be satisfactorily interpreted when deviations from Koopmans' theorem are taken into account by performing RHF calculations on the various low-lying ionic states of the molecule. M.P. 4 I

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