Issue 40, 2011

A homobimetallic complex of chromium(0) with a σ-borane component

Abstract

The synthesis, characterization, and reactivity of a chromium(0) complex bearing an amine–borane moiety (η6-C6H5CH2NMe2·BH3)Cr(CO)3 (2) is reported. Photolysis of complex 2 results in the elimination of a CO ligand followed by the formation of an intramolecular σ-borane complex (η1-(η6-C6H5CH2NMe2·BH2–H))Cr(CO)2 (3). This species was characterized in solution by NMR spectroscopy. Reaction of complex 2 with photochemically generated (OC)5Cr(THF) affords a novel homobimetallic σ-borane complex (OC)3Cr(η6-C6H5CH2NMe2·BH2–H–Cr(CO)5) (4), wherein one of the BH moieties is bound to the chromium center in an η1-fashion. The σ-borane complex 4 was isolated in moderate to good yield (72%). The BH3 fragment in the complexes 3 and 4 are highly dynamic involving exchange of the BH hydrogen bound to the metal with the terminal BH hydrogen atoms. The dynamics has been studied using variable-temperature NMR spectroscopy. Complexes 2 and 4 have been characterized by X-ray crystallography.

Graphical abstract: A homobimetallic complex of chromium(0) with a σ-borane component

Supplementary files

Article information

Article type
Paper
Submitted
05 Apr 2011
Accepted
02 Jun 2011
First published
14 Jul 2011

Dalton Trans., 2011,40, 10592-10597

A homobimetallic complex of chromium(0) with a σ-borane component

B. Bera, Y. P. Patil, M. Nethaji and B. R. Jagirdar, Dalton Trans., 2011, 40, 10592 DOI: 10.1039/C1DT10584A

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