Structure variation of mercury(II) halide complexes with different imidazole-containing ligands

A series of coordination complexes with different structures [Hg(iimb)I2]·0.5acetone (1), [Hg(bib)Br2]·0.5THF (2), [Hg(bib)I2] (3), [Hg3(tib)2I6]·2DMF (4), [Hg3(timpt)2I6]·4H2O (5), [Hg2(titmb)Br4] (6), and [Hg2(titmb)Cl4] (7) were synthesized by reactions of mercury(II) halides with the corresponding imidazole-containing bidentate or tripodal ligands, namely, 1-(1-imidazolyl)-4-(imidazol-1-ylmethyl)benzene (iimb), 1-bromo-3,5-bis(imidazol-1-ylmethyl)benzene (bib), 1,3,5-tris(1-imidazolyl)benzene (tib), 2,4,6-tris[4-(imidazol-1-ylmethyl)phenyl]-1,3,5-triazine (timpt), and 1,3,5-tris(imidazol-1-ylmethyl)-2,4,6-trimethylbenzene (titmb), respectively. The structures of the complexes were determined by single-crystal X-ray diffraction analyses, and the results revealed that 1, 2, and 4−7 are one-dimensional (1D) chain coordination polymers with different shapes. In the case of 3, two metal atoms and two bib ligands form M2L2 binuclear rings, which are further connected by weak Hg···I interactions to form an i...