Abstract
O-Functionalized N-heterocyclic carbene complex of silver has been synthesized and its structural and electronic properties have been studied. Theoretical calculation suggests that the NHC–Ag interaction is predominantly σ-bonding in nature.
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 Ag
2O in 42% yield. The 1-
i-propyl-3-(2-oxo-2-
t-butyl ethyl)imidazolium chloride
1a was synthesized by the alkylation reaction of 1-
i-propylimidazole with α-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 σ-donor. The π-back-bonding from the metal to the ligand was found to be negligible.