Main Group Metal Halide Complexes with Sterically Hindered Thioureas XI. Complexes of Antimony(III) and Bismuth(III) Chlorides with a New Bidentate Thiourea — 1,1′-methylenebis(3-methyl-2H-imidazole-2-thione)

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Bidentate 1,1'-methylenebis(3-methyl-2H-imidazole-2-thione) (L), SbCl3L, and BiCl3L were synthesized and characterized. SbCl3L is monoclinic, space group P21/c, a 11.812(9), b 7.699(4), c 18.100(9) Å, β 101.29(5)°, Z = 4, R = 0.042, Rw = 0.041. Geometry at Sb was distorted octahedral with bridging S atoms creating long zigzag chains of octahedra sharing vertexes cis to each other. Two Cl atoms are trans to each other, and the 3rd Cl is trans to the bridging S. The Sb-S bridges are 3.41 Å in length. There is not strong evidence for a stereospecific lone pair in the coordination sphere of Sb. The ligand forms an 8-membered ring with the Sb atom included. Solid state IR data showed little change in L vibrational modes normally sensitive to coordination; NMR gave evidence for a high degree of assocn.