title: Tris(carbene)borate ligands featuring imidazole-2-ylidene, benzimidazol-2-ylidene, and 1,3,4-triazol-2-ylidene donors. Evaluation of donor properties in four-coordinate {NiNO}10 complexes.
abstract: The synthesis and characterization of new tris(carbene)borate ligand precursors containing substituted benzimidazol-2-ylidene and 1,3,4-triazol-2-ylidene donor groups, as well as a new tris(imidazol-2-ylidene)borate ligand precursor are reported. The relative donor strengths of the tris(carbene)borate ligands have been evaluated by the position of ν(NO) in four-coordinate {NiNO}(10) complexes, and follow the order: imidazol-2-ylidene > benzimidazol-2-ylidene > 1,3,4-triazol-2-ylidene. There is a large variation in ν(NO), suggesting these ligands to have a wide range of donor strengths while maintaining a consistent ligand topology. All ligands are stronger donors than Tp* and Cp*.
authors.affiliation: Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003, United States.
authors.forename: Salvador B
authors.initials: SB
authors.lastname: Muñoz
authors.forename: Wallace K
authors.initials: WK
authors.lastname: Foster
authors.forename: Hsiu-Jung
authors.initials: HJ
authors.lastname: Lin
authors.forename: Charles G
authors.initials: CG
authors.lastname: Margarit
authors.forename: Diane A
authors.initials: DA
authors.lastname: Dickie
authors.forename: Jeremy M
authors.initials: JM
authors.lastname: Smith
mesh_terms: D001897:Boronic Acids / Q000138:chemical synthesis / Q000737:chemistry*; D018360:Crystallography, X-Ray; D007093:Imidazoles / Q000138:chemical synthesis / Q000737:chemistry*; D008024:Ligands; D008958:Models, Molecular; D008968:Molecular Conformation; D009532:Nickel / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D014230:Triazoles / Q000737:chemistry*
chemical_list: D001897:Boronic Acids; D007093:Imidazoles; D008024:Ligands; D009942:Organometallic Compounds; D014230:Triazoles; D009532:Nickel; C028007:nickel monoxide