BIDENTATE CHELATING AND BRIDGING BIIMIDAZOLE LIGANDS IN COMPLEXES OF 2,2'-BIIMIDAZOLE AND N,N'-DIMETHYL-2,2'-BIIMIDAZOLE WITH SNX(4) (X=CL,BR, I)

The complexes [(SnX(4))(n)(LL)] (X = Cl, Br or I; n = 1, 2), where LL is 2,2'-biimidazole (H(2)Blm) or N,N'-dimethyl-2,2'-biimidazole (DMBIm ) and [SnX(4)(H(2)BIm)(2)] (X = Cl or Br) were prepared from tin(IV) h afides and the corresponding ligands and subsequently characterized. F or complexes with n = 1, IR and Mossbauer data are in keeping with a h exa-coordinate tin atom chelated by the bidentate ligands LL. For n = 2, the tin atom is also hexacoordinate: the species LL act as bidentat e bridging ligands, and the coordination number is made up to six by S nXSn bridges. In [SnX(4)(H(2)BIm)(2)], one H(2)BIm is a bidentate chel ating ligand and the other is occluded in the lattice. Conductivity me asurements indicated that the compounds were not ionic in CH3CN, and N MR data suggest extensive dissociation in DMSO.