Coordination Chemistry of Carborane Clusters: Metal-Boron Bonds in Carborane, Carboranyl, and Carboryne Complexes

Abstract

Metalated three-dimensional icosahedral boron clusters often exhibit high chemical and thermal stability relative to their simple borane counterparts thus making them a convenient object to study the chemistry of metal-boron bonds. The presence of multiple reactive boron vertices makes carboranes unique ligands with unusual steric and electronic requirements. This article summarizes recent developments in coordination chemistry of neutral {C₂B₁₀} carborane clusters with a focus on metal-boron interactions. Several bonding modes are discussed, including neutral borane coordination through bridging B–H··· M interactions, boryl complexes with B -M bonds, multimetallic assemblies, and the BB-carboryne complex containing a three-membered (BB)>Ru metallacycle.

Keywords:

• carboranes
• ligand design
• boryls
• carborynes
• multimetallic complexes
• pincer complexes

Additional information

Funding

This material is based in part upon work supported by the National Science Foundation under Award CHE-1654301, Division of Chemistry.