Synthesis and Characterization of (Cp*Ru)3Co(CO)23-CO)B3H3 (Cp* = η5-C5Me5):  A Metallaborane with Cubane Cluster Structure

Addition of a cobalt carbonyl fragment to (Cp*Ru)3(μ-H)2B3H6 leads to hydrogen loss and formation of the highly condensed (Cp*Ru)3Co(CO)23-CO)B3H3 cluster. Viewed as a 60-electron tetranuclear metal cluster with six M−M bonds, it completes the series:  64-electron (CpCo)4B4H4 with four M−M bonds; 68-electron (CpNi)4B4H4 with two M−M bonds.