Picoline and pyridine functionalised chelate N-heterocyclic carbene complexes of nickel: synthesis and structural studies

Winston, Scott, Stylianides, Neoklis, Tulloch, Arran A.D., Wright, Joseph A. and Danopoulos, Andreas A. (2004) Picoline and pyridine functionalised chelate N-heterocyclic carbene complexes of nickel: synthesis and structural studies. Polyhedron, 23 (17), 2813-2820. (doi:10.1016/j.poly.2004.07.002).

Abstract

The first pyridine and picoline functionalised N-heterocyclic carbene complexes of nickel are described in this paper. The nature of the isolated complexes is critically dependent on the bite angle and the substituents of the ligand used and the synthetic method for the introduction of the ligand on the metal. From NiBr2 (DME), DME=1,2-dimethoxyethane, by transmetallation with one equivalent of Ag(CN)2]Br2 (3). Transmetallation with Ag(C-N)Cl, (C-N) = [3-(2,6-Pr-2(i) C6H3)1[1-(2-pyridyl)imidazol-2-ylidene] afforded the bimetallic species [(C-N)(2)Ni(mu-Br)(2) NiBr2] (4), containing one octahedral and one tetrahedral nickel centre. Finally, from the reaction of NiBr2 (DME) with free (C-N*), (C-N*) = 3-(2,6-(Pr2C6H3)-C-i)-1-[2-(3-picolyl)]-imidazol-2-ylidene, good yields of Ni(C-N*)Br-2, (6) were obtained. Attempts to alkylate (1) were not successful.

This record has no associated files available for download.

Contributors

Download statistics