The effect of linear chain structure on the electronic structure of pt(II) diimine complexes

Abstract

In square planar d 8 complexes, the crystalline state can have a pronounced effect upon the electronic structure and photophysical parameters of the monomer due to electronic interactions between nearest neighbors. In this article, we discuss the luminescence behavior of Pt(II) diimine complexes in dilute monomeric environments and in linear chain solid state structures. In these complexes, triplet excited states of ligand field, metal-to-diimine charge transfer, and diimine (π-π *) type lie at similar energies. Their relative ordering is influenced not only by intramolecular factors such as ligand field strength and diimine substituents, but also by the intermolecular structure of the crystal packing. The observed luminescence is a sensitive probe of these factors in the solid state.