The coordination chemistry of boraamidinate ligands

The boraamidinate ligand, [RB(NR′)2]2−, is isoelectronic with the corresponding and extensively studied amidinate ligand, [RC(NR′)2]−. This review provides the first comprehensive account of the coordination chemistry of the boraamidinate ligand with s-, p- and d-block metals. The focus is on the methods available for the synthesis of metal complexes, as well as the variety of bonding modes exhibited by these dianionic ligands at metal centers. The properties and reactivity of individual metal boraamidinates are discussed and, where appropriate, compared with those of the related amidinate complexes. In particular, the formation of the radical anion, [RB(NR′)2]−, by the oxidation of main group complexes is highlighted.