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Mercury(II) complexes (Me-maloNHC Dipp )HgCl ( 1b ), ( t -Bu-maloNHC Dipp )HgCl ( 2b ) and ( t -Bu-maloNHC Dipp )HgMe ( 2c ) supported by anionic N -heterocyclic carbenes have been obtained in good yields from the reaction of the potassium salt of N -heterocyclic carbene ligand precursors and mercury(II) salts, HgCl 2 and MeHgI. These molecules have been characterized by 1 H-NMR, 13 C-NMR and IR spectroscopy and elemental analysis. X-ray crystal structures of 1b and 2b are also presented. Interestingly, complex 1b is polymeric {(Me-maloNHC Dipp )HgCl} n in the solid state, as a result of inter-molecular Hg-O contacts, and features rare three coordinate mercury sites with a T-shaped arrangement, whereas the ( t -Bu-maloNHC Dipp )HgCl ( 2b ) is monomeric and has a linear, two-coordinate mercury center. The formation of T-shaped structure and the aggregation of complex 1b is attributable to the reduced steric demand of the N -heterocyclic carbene ligand backbone substituent.

Mercury(II) Complexes of Anionic N-Heterocyclic Carbene Ligands: Steric Effects of the Backbone Substituent