Experimental and theoretical studies of a silver complex of O-functionalized N-heterocyclic carbene
作者:Manoja K. Samantaray、Dipankar Roy、Ahindra Patra、Raji Stephen、Mobin Saikh、Raghavan B. Sunoj、Prasenjit Ghosh
DOI:10.1016/j.jorganchem.2006.05.037
日期:2006.9
Experimental and theoretical studies of a silver complex namely, [1-i-propyl-3-(2-oxo-2-t-butyl ethyl)imidazol-2-ylidene]AgCl (1b), supported over an O-functionalized N-heterocyclic carbene ligand are reported. Specifically, [1-i-propyl-3-(2-oxo-2-t-butyl ethyl)imidazol-2-ylidene]AgCl (1b) was synthesized by reaction of 1-i-propyl-3-(2-oxo-2-t-butyl ethyl)imidazolium chloride 1a with Ag2O in 42% yield. The 1-i-propyl-3-(2-oxo-2-t-butyl ethyl) imidazolium chloride la was synthesized by the alkylation reaction of 1-i-propylimidazole with alpha-chloropinacolone in 70% yield. The molecular structures of 1a and 1b have been determined by X-ray diffraction. Detailed theoretical investigation has been performed using the density functional theory method with the B3LYP functional. Bonding in 1b has been probed with the help of charge decomposition analysis (CDA), atoms in molecule (AIM) approach as well as natural bond orbital (NBO) methods. The Ag-NHC bond has a dominantly covalent character with NHC acting as an effective sigma-donor. The pi-back-bonding from the metal to the ligand was found to be negligible. (c) 2006 Elsevier B.V. All rights reserved.