Bulky N-heterocyclic carbene and pyridine donor adducts of Co(II) bromide: Influence on reactivity of stoichiometry, sterics and donor capability

Katharine A. Smart, Antonia Vanbergen, Jan Lednik, Christina Y. Tang, Hassanatu B. Mansaray, Inke Siewert, Simon Aldridge*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)33-39
Number of pages7
JournalJournal of Organometallic Chemistry
Volume741-742
Issue number1
DOIs
Publication statusPublished - 2013

Scopus Subject Areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

User-Defined Keywords

  • Bulky ligands
  • Cobalt
  • N-Heterocyclic carbine
  • Pyridine

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