Electronic coupling between remote metal centers in cyanobridged polynuclear complexes

Several cyanide-bridged polynuclear complexes have been synthesized in the context of intramolecular energy and electron transfer studies. A valencelocalized description is generally appropriate for such complexes. Within such a localized picture, however, the cyanide bridge is found to provide a remarkable degree of metal-metal electronic coupling. This conclusion can be drawn from a variety of experimental results. Specific attention is devoted here to the spectroscopic observation of appreciable second-order interactions between remote (i.e., non directly bridged) sites in a polynuclear complex. © 1993.