title: Isolable, copper(I) dicarbonyl complexes supported by N-heterocyclic carbenes.
abstract: Cationic copper(I) dicarbonyl complexes supported by N-heterocyclic carbene ligands, SIPr and IPr*, have been synthesized. [(SIPr)Cu(CO)(2)][SbF(6)] and [(IPr*)Cu(CO)(2)][SbF(6)] have a trigonal planar, three-coordinate copper atom with an average Cu-CO distance of 1.915 Å and display C-O stretching frequencies higher than that of the free CO (2143 cm(-1)). The high CO stretching frequencies suggest that the Cu(I)-CO interaction in these cationic adducts is dominated by electrostatic and OC → Cu σ-donor components. [(SIPr)Cu(CO)(2)][SbF(6)] and [(IPr*)Cu(CO)(2)][SbF(6)] readily form the corresponding [(SIPr)Cu(CO)(H(2)O)][SbF(6)] and [(IPr*)Cu(CO)(H(2)O)][SbF(6)] with  loss of a CO even with traces of water, but they can be converted back to the dicarbonyl adducts using excess CO. The synthesis and structure of [(IPr*)Cu(H(2)O)][SbF(6)] are also reported. It is a two-coordinate copper adduct with a Cu-O distance of 1.874(2) Å. It reacts with excess CO to form [(IPr*)Cu(CO)(2)][SbF(6)].
authors: Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019-0065, USA.
authors: Chandrakanta
authors: C
authors: Dash
authors: Animesh
authors: A
authors: Das
authors: Muhammed
authors: M
authors: Yousufuddin
authors: H V Rasika
authors: HV
authors: Dias
mesh_terms: D003300:Copper / Q000737:chemistry* / Q000302:isolation & purification; D018360:Crystallography, X-Ray; D006571:Heterocyclic Compounds / Q000737:chemistry* / Q000302:isolation & purification; D008697:Methane / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification; D008958:Models, Molecular; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D006571:Heterocyclic Compounds; D009942:Organometallic Compounds; C030011:carbene; D003300:Copper; D008697:Methane