Three-coordinate copper platforms that support rapid Cu(II/I) electron transfer and metal-ligand multiple bonding

Abstract

Three-coordinate copper ions are important as biol. electron transfer (ET) reagents, and yet synthetic three-coordinate copper systems that mediate reversible ET are rare and the factors that influence their ET rates have not been studied. Isolation of three-coordinate copper anilide complexes in the Cu(I) and Cu(II) oxidn. states supported by bis(phosphino)borate ligands will be described, and measurements of the self-exchange ET rates in these systems will be discussed. In addn., the synthesis, spectroscopic characterization, and reactivity of terminal [bis(phosphino)borate]copper carbene and nitrene species, which are implicated as intermediates in copper-catalyzed group transfer reactions, will be presented.

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