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N-heterocyclic carbene stabilized copper- and silver-phenylchalcogenolate ring complexes.

Will J Humenny1, Stefan Mitzinger, Chhatra B Khadka

  • 1Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada.

Dalton Transactions (Cambridge, England : 2003)
|February 23, 2012
PubMed
Summary

N-heterocyclic carbene (NHC) ligands were used to synthesize novel copper and silver chalcogenolate clusters. These new complexes offer an alternative to traditional phosphine ligands in coordination chemistry.

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Area of Science:

  • Coordination Chemistry
  • Organometallic Chemistry
  • Materials Science

Background:

  • Traditional phosphine ligands (PR3) are commonly used in coordination chemistry for forming metal complexes.
  • N-heterocyclic carbenes (NHCs) offer unique electronic and steric properties as alternatives to phosphine ligands.
  • Group 11 metals (copper and silver) are important in catalysis and materials science.

Purpose of the Study:

  • To explore N-heterocyclic carbene (NHC) ligands as alternatives to PR3 ligands for synthesizing copper and silver chalcogenolate clusters.
  • To synthesize and characterize novel NHC-ligated copper and silver complexes.
  • To investigate the formation of polynuclear metal-chalcogenolate clusters using these NHC-metal complexes.

Main Methods:

  • Ligation of N-heterocyclic carbene (1,3-di-isopropylbenzimidazole-2-ylidene, (iPr2-bimy)) to silver acetate (AgOAc) and copper(I) chloride (CuCl) salts.
  • Characterization of the resulting complexes using spectroscopic methods (e.g., NMR, IR) and crystallographic analysis (X-ray diffraction).
  • Reaction of isolated NHC-metal complexes with chalcogenolating agents (S(Ph)SiMe3 and Se(Ph)SiMe3) to form polynuclear clusters.

Main Results:

  • Formation of four novel NHC-ligated silver and copper complexes ([Ag(OAc)((iPr2-bimy))] 1, [Ag(OAc)((iPr2-bimy)2)] 2, [CuCl((iPr2-bimy))]2 3, and [CuCl((iPr2-bimy)2)] 4) depending on ligand-to-metal ratios.
  • Successful synthesis of four polynuclear metal-chalcogenolate clusters ([Ag4(μ-EPh)4((iPr2-bimy))4] 5 (E=S), 6 (E=Se) and [Cu3(μ-EPh)3((iPr2-bimy))3] 7 (E=S), 8 (E=Se)) in good yields.
  • Detailed structural elucidation of the polynuclear clusters 5-8 via single crystal X-ray crystallography, revealing their unique cluster architectures.

Conclusions:

  • N-heterocyclic carbenes (NHCs) are effective ligands for the synthesis of group 11 metal complexes.
  • The use of NHCs provides a viable alternative to traditional phosphine ligands in the formation of metal-chalcogenolate clusters.
  • The study successfully demonstrates the utility of NHC ligands in constructing novel polynuclear silver and copper chalcogenolate structures.