Synthetic, structural, and thermochemical studies of N-heterocyclic carbene (NHC) and tertiary phosphine Ligands in the [(L)(2)Ni(CO)(2)] (L = PR3, NHC) system

Natalie M. Scott, Herve Clavier, Parisa Mahjoor, Edwin D. Stevens, Steven Patrick Nolan

Research output: Contribution to journalArticlepeer-review

79 Citations (Scopus)

Abstract

Two new dicarbonyl N-heterocyclic carbene nickel(0) complexes of the type (NHC)(2)Ni(CO)(2) (NHC = ICy, [N,N'-bis(cyclohexylimidazol)-2-ylidene (2), IMes [N,N'-bis(2,4,6-trimethylphenyl)imidazol)-2-ylidene] (3)) have been prepared by a substitution reaction of (NHC)Ni(CO)(2) (NHC = (IBu)-Bu-t [N,N'-bis(tert-butylimidazol)-2-ylidene], IAd [N,N'-bis(1-adamantylimidazol)-2-ylidene]) and 2 equivalents of ICy or IMes. Single-crystal X-ray analyses confirmed the monomeric 18-electron compositions Of [(ICY)2Ni(CO)21 (2) and [(IMeS)(2)Ni(CO)(2)] (3). The greater electron-donating properties of the NHC ligands compared to tertiary phosphines are also demonstrated through calorimetric studies and enabled the determination of average bond dissociation enthalpies for Ni-L (L = NHC and tertiary phosphine).

Original languageEnglish
Pages (from-to)3181-3186
Number of pages6
JournalOrganometallics
Volume27
Issue number13
DOIs
Publication statusPublished - 14 Jul 2008

Keywords

  • OLEFIN-METATHESIS CATALYSTS
  • C BOND FORMATION
  • ROOM-TEMPERATURE
  • METAL-COMPLEXES
  • SUZUKI-MIYAURA
  • ORGANOMETALLIC CHEMISTRY
  • NUCLEOPHILIC CARBENES
  • HOMOGENEOUS CATALYSIS
  • PHOSPHORUS LIGANDS
  • IRIDIUM COMPLEXES

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