Department of Chemistry
Bulky N-heterocyclic carbene and pyridine donor adducts of Co(II) bromide: Influence on reactivity of stoichiometry, sterics and donor capability
The reactivity of cobalt dibromide with the bulky N-heterocyclic carbenes IMes and IPr has been explored [IMes = N,N0-bis(2,4,6-trimethylphenyl)imidazol- 2-ylidene; IPr = N,N0-bis(2,6-diisopropylphenyl)imidazol-2-ylidene], with the aim of generating synthetically versatile complexes of the types (NHC)CoBr 2 and (NHC)2CoBr2. Differences between the two carbene systems illustrate the key role of ligand sterics in this synthetic approach, while the importance of donor strength is emphasized by comparative studies with the related sterically encumbered pyridine ligand 2,6-Mes 2py. Thus, IMes and IPr are differentiated by the inability of the latter, bulkier, donor to form a 2:1 adduct, while 2,6-Mes2py gives rise to CoeN bonds only in the presence of a suitable halide abstraction agent.© 2013 Elsevier B.V. All rights reserved.
Bulky ligands, Cobalt, N-Heterocyclic carbine, Pyridine
Source Publication Title
Journal of Organometallic Chemistry
Smart, Katharine A., Antonia Vanbergen, Jan Lednik, Christina Y. Tang, Hassanatu B. Mansaray, Inke Siewert, and Simon Aldridge. "Bulky N-heterocyclic carbene and pyridine donor adducts of Co(II) bromide: Influence on reactivity of stoichiometry, sterics and donor capability." Journal of Organometallic Chemistry 741-742 (2013): 33-39.