10.1021/om200514t.s002 Shubhankar Kumar Bose Shubhankar Kumar Bose Sundargopal Ghosh Sundargopal Ghosh Novel 11-Vertex, 11-Skeletal Electron Pair Tantalaborane of Unusual Shape American Chemical Society 2011 core geometry vertex Electron Pair Tantalaborane Unusual ShapeThis work reports title cluster BHB bonds Cp 2011-09-12 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Novel_11_Vertex_11_Skeletal_Electron_Pair_Tantalaborane_of_Unusual_Shape/2615596 This work reports the synthesis and structural characterization of a hydrogen-rich tantalaborane cluster, [(Cp*Ta)(Cp*TaCl)B<sub>9</sub>H<sub>16</sub>] (<b>2</b>, Cp* = η<sup>5</sup>-C<sub>5</sub>Me<sub>5</sub>), obtained from the thermolysis of [BH<sub>3</sub>·thf] and an in situ generated intermediate, produced from the reaction of [Cp*TaCl<sub>4</sub>], <b>1</b>, and [LiBH<sub>4</sub>·thf]. Cluster <b>2</b> has an 11-vertex <i>nido</i>-cage geometry. The core geometry of <b>2</b> can be derived from an icosahedron by removing the apical five-coordinate vertex. The title cluster is a rare example of an electronically unsaturated metallaborane containing four TaHB and three BHB bonds.