Abstract

ESCA investigations of cobalt(III) and nickel(II) ammine complexes and of cobalt(III) dimethylglyoxime mixed complexes revealed the effect of halide ions bound by hydrogen bridges in the outer coordination sphere and coordinated directly to the central atom, on the strength of the coordinate bond between the metal atom and nitrogen donor atoms. It was suggested that the differences in the electron binding energies in the orbitals of the central atom and in those of the donor atoms could be used for indicating the strength of metal-ligand interactions (in systems with no π-back bonding). The investigation also provided information on the interaction of halide ions in the outer sphere with the complex cation.

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