Abstract
Mononuclear mercury complexes ( 1, 2, and 3) bearing bis- N-heterocyclic carbene (NHC) ligands of the form [(NHC) 2-μ-Hg] +2 have been prepared and structurally characterised. The complexes were derived from three bis-imidazolium salts as precursors to NHC; either 1,3-bis( N-methylimidazolium-1-ylmethyl)benzene bis(hexafluorophosphate) ( I·2PF 6), 1,3-bis( N-butylimidazolium-1-ylmethyl)benzene bis(hexafluorophosphate) ( II·2PF 6) or 3,5-bis( N-butylimidazolium-1-ylmethyl)toluene bis(hexafluorophosphate) ( III·2PF 6) treated with mercury(II) acetate. Interestingly X-ray crystal structure analysis revealed a close interaction between the Hg metal centre with one carbon atom of the aryl linker in addition to coordination with two NHCs.
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