A Boryl Bridged Complex: An Unusual Coordination Mode of the BR₂ Ligand

Building bridges: The combination of the Lewis acidic dichloroboryl complex [(η5-C5Me5)Fe(CO)2BCl2] and a Lewis basic [Pd(PR3)] fragment gives the first dinuclear monoboryl complex with a symmetric μ, η2 bridging BR2 ligand (see structure). The dative nature of the palladium–boron bonding interaction makes the dinuclear compound a rare example of a transition-metal borane complex.