Chalcogen Stabilized bis‐Hydridoborate Complexes of Cobalt: Analogues of Tetracyclo[4.3.0.0 2,4 .0 3,5 ]nonane

Joseph, Benson ; Gomosta, Suman ; Prakash, Rini ; Roisnel, Thierry ; Phukan, Ashwini K. ; Ghosh, Sundargopal (2020) Chalcogen Stabilized bis‐Hydridoborate Complexes of Cobalt: Analogues of Tetracyclo[4.3.0.0 2,4 .0 3,5 ]nonane Chemistry - A European Journal, 26 (70). pp. 16824-16832. ISSN 0947-6539

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Official URL: http://doi.org/10.1002/chem.202003152

Related URL: http://dx.doi.org/10.1002/chem.202003152

Abstract

Treatment of Li[BH3ER] (E=Se or Te, R=Ph; E=S, R=CH2Ph) with [Cp*CoCl]2 led to the formation of hydridoborate complexes, [{CoCp*Ph}{Cp*Co}{μ-EPh}{μ-κ2-E,H-EBH3}], 1a and 1 b (1 a: E=Se; 1 b: E=Te) and a bis-hydridoborate species [Cp*Co{μ-κ2-Se,H-SeBH3}]2, 2. All the complexes, 1 a, 1 b and 2 are stabilized by β-agostic type interaction in which 1 b represents a novel bimetallic borate complex with a rare B−Te bond. QTAIM analysis furnished direct proof for the existence of a shared and dative B-chalcogen and Co-chalcogen interactions, respectively. In parallel to the formation of the hydridoborate complexes, the reactions also yielded tetracyclic species, [Cp*Co{κ3-E,H,H-E(BH2)2-C5Me5H3}], 3 a and 3 b (3 a: E=Se and 3 b: E=S), wherein the bridgehead boron atoms are surrounded by one chalcogen, one cobalt and two carbon atoms of a cyclopentane ring. Molecules 3 a and 3 b are best described as the structural mimic of tetracyclo[4.3.0.02,4.03,5]nonane having identical structure and similar valence electron counts.

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Deposited On:13 Oct 2021 07:42
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