An unusual 13-vertex closo-carbacobaltaborane; synthesis and molecular structure of [1-Me-4-(Et3P)-µ4,6-or-7-{Co(PEt3)2-µ-(H)2}-1,2,4-C2CoB10H10]

Reaction (room temperature, toluene) of closo-1-Me-1,2-C2B10H11 with two equivalents of [Co(PEt3)4] affords the title compound, structurally identified by X-ray crystallography.