Synthesis and structure of dirhodium analogue of octaborane-12 and decaborane-14

Roy, Dipak Kumar ; Bose, Shubhankar Kumar ; Anju, R. S. ; Ramkumar, V. ; Ghosh, Sundargopal (2012) Synthesis and structure of dirhodium analogue of octaborane-12 and decaborane-14 Inorganic Chemistry, 51 (20). pp. 10715-10722. ISSN 0020-1669

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We present the results of our investigation of a thermally driven cluster expansion of rhodaborane systems with BH3·THF. Four novel rhodaborane clusters, for example, nido-[(Cp*Rh) 2B6H10], 1; nido-[(Cp*Rh)B9H13], 2; nido-[(Cp*Rh)2B8H12], 3; and nido-[(Cp*Rh) 3B8H9(OH)3], 4 (Cp* = η5-C5Me5), have been isolated from the thermolysis of [Cp*RhCl2]2 and borane reagents in modest yields. Rhodaborane 1 has a nido geometry and is isostructural with [B8H12]. The low temperature 11B and 1H NMR data demonstrate that compound 1 exists in two isomeric forms. The framework geometry of 2 and 3 is similar to that of [B10H14] with one BH group in 2 (3-position), and two BH groups in 3 (3, 4-positions) are replaced by an isolobal {Cp*Rh} fragment. The 11 vertex cluster 4 has a nido structure based on the 12 vertex icosahedron, having three rhodium and eight boron atoms. In addition, the reaction of rhodaborane 1 with [Fe2 (CO)9] yielded a condensed cluster [(Cp*Rh)2{Fe(CO)3}2B6H10], 5. The geometry of 5 consists of [Fe2B2] tetrahedron and an open structure of [(Cp*Rh)2B6], fused through two boron atoms. The accuracy of these results in each case is established experimentally by spectroscopic characterization in solution and structure determinations in the solid state.

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Source:Copyright of this article belongs to American Chemical Society.
ID Code:109095
Deposited On:31 Jan 2018 12:28
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