Chemistry of diruthenium and dirhodium analogues of pentaborane(9): synthesis and characterization of metal N,S-heterocyclic carbene and B-agostic complexes

Roy, Dipak Kumar ; Mondal, Bijan ; Anju, R. S. ; Ghosh, Sundargopal (2015) Chemistry of diruthenium and dirhodium analogues of pentaborane(9): synthesis and characterization of metal N,S-heterocyclic carbene and B-agostic complexes Chemistry - A European Journal, 21 (9). pp. 3640-3648. ISSN 0947-6539

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/chem.20...

Related URL: http://dx.doi.org/10.1002/chem.201405218

Abstract

Building upon our earlier results on the synthesis of electron-precise transition-metal–boron complexes, we continue to investigate the reactivity of pentaborane(9) and tetraborane(10) analogues of ruthenium and rhodium towards thiazolyl and oxazolyl ligands. Thus, mild thermolysis of nido-[(Cp*RuH)2B3H7] (1) with 2-mercaptobenzothiazole (2-mbtz) and 2-mercaptobenzoxazole (2-mboz) led to the isolation of Cp*-based (Cp*=η5-C5Me5) borate complexes 5 a,b [Cp*RuBH3L] (5 a: L=C7H4NS2; 5 b: L=C7H4NOS)) and agostic complexes 7 a,b [Cp*RuBH2(L)2], (7 a: L=C7H4NS2; 7 b: L=C7H4NOS). In a similar fashion, a rhodium analogue of pentaborane(9), nido-[(Cp*Rh2B3H7] (2) yielded rhodaboratrane [Cp*RhBH(L)2], 10 (L=C7H4NS2). Interestingly, when the reaction was performed with an excess of 2-mbtz, it led to the formation of the first structurally characterized N,S-heterocyclic rhodium-carbene complex [(Cp*Rh)(L2)(1-benzothiazol-2-ylidene)] (11) (L=C7H4NS2). Furthermore, to evaluate the scope of this new route, we extended this chemistry towards the diruthenium analogue of tetraborane(10), arachno-[(Cp*RuCO2B2H6] (3), in which the metal center possesses different ancillary ligands.

Item Type:Article
Source:Copyright of this article belongs to John Wiley & Sons, Inc.
Keywords:Agostic Interactions; Borane; Carbene; Rhodium; Transition Metals
ID Code:108834
Deposited On:31 Jan 2018 11:56
Last Modified:31 Jan 2018 11:56

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