Homoleptic crown n-heterocyclic carbene complexes

McKie, Ross and Murphy, J.A. and Park, S.R. and Spicer, M.D. and Zhou, S. (2007) Homoleptic crown n-heterocyclic carbene complexes. Agewandte Chemie-International Edition, 46 (34). pp. 6525-6528. ISSN 1433-7851

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Abstract

The first metal N-heterocyclic carbene complexes derived from a cyclic tetraimidazolium salt show a remarkable versatility of ligand conformation and coordination geometry. With PdII, a mononuclear square-planar complex is obtained, but with CuI and AgI, an unprecedented dinuclear motif with a short metal–metal interaction is observed (see structure; N blue, C white ellipsoids, H white circles).