The reaction of 1,3-dimethylimidazolium chloride with Hg(O2CCH3)2 afforded a bis(carbene)mercury(II) complex (2), which is characterized by multinuclear NMR spectroscopy (1H, 13C, 15N, and 199Hg) and by single-crystal X-ray analysis. As a consequence of chloride-ion interaction with the mercury center, the C2-Hg-C2 angle in 2 is reduced to 161.4 (3)° compared to its near-linear value in complex 4 that contains perchlorate counterions. The C2 resonance in the mercury complex 2 moves upfield by 36.96 ppm relative to the parent carbene (2), with a large 1JHgC = 2741.18 Hz.
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Arduengo et al. (1996) studied this question.
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