The Preparation and Structural Characterization of 1-methylimidazolium and 1,3-dimethylimidazolium Tetrachlorobismuthate(III)

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In attempting to synthesize complexes of BiCl3 with 1-methyl-2(3H)-imidazolethione and 1,3-dimethyl-2(3H)-imidazoletellurone, the resp. imidazolium salts stabilized by the tetrachlorobismuthate(III) anion were obtained. The two new compds. were characterized via std. methods and x-ray crystallog. One compd., 1,3-dimethylimidazolium tetrachlorobismuthate(III), crystallizes in space group C2/c with a 14.7000(12), b 12.7200(8), c 7.3150(6) Å, and β 117.744(5)°. The other compd., 1-methylimidazolium tetrachlorobismuthate(III), crystallizes in space group P21/c with a 11.1534(12), b 12.9635(14), c 7.2856(8) Å, and β 94.319(2)°. The large anion is comprised of polymeric zigzag chains of octahedrally coordinated Bi sharing alternating edges through cis Cl bridging. The resulting long linear channels house the planar cations stacked parallel to each other. Differences in anion geometries can be attributed to H bonding in the 1-methylimidazolium salt, and there is no strong evidence of lone-pair stereoactivity in either of the compds.