Collect. Czech. Chem. Commun. 2007, 72, 609-617

trans-Bis[1,3-bis(2,4,6-trimethylphenyl)imidazolidin-2-ylidene]dichloronickel(II): Synthesis and Structure

Andrzej Kozioła, Stanisław Pasynkiewicza, Antoni Pietrzykowskia,* and Lucjan B. Jerzykiewiczb

a Faculty of Chemistry, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland
b Faculty of Chemistry, University of Wrocław, Joliot-Curie 14, 50-353 Wrocław, Poland


trans-Bis[1,3-bis(2,4,6-trimethylphenyl)imidazolidin-2-ylidene]dichloronickel(II), [NiCl2(SIMes)2], was synthesized in a one-pot reaction of fluorenyllithium with nickel(II) bromide followed by the addition of 1,3-bis(2,4,6-trimethylphenyl)imidazolidinium chloride. Labile difluorenyl- nickel, formed in the course of the reaction, behaves differently than nickelocene and indenocene in analogous reactions. It exchanges both fluorenyl ligands giving the title compound. The crystal and molecular structure of this compound have been determined by single-crystal X-ray diffraction. The compound crystallizes in the monoclinic crystal system with square-planar geometry around the central nickel atom.

Keywords: Nickel; N-heterocyclic carbenes; Carbene complexes; Imidazolium salts; Fluorene; Crystal structure determination; X-Ray diffraction.

References: 35 live references.