SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF BISMUTH COMPLEXES WITH SULFUR-CONTAINING LIGANDS - THE CRYSTAL AND MOLECULAR-STRUCTURES OF 2 DERIVATIVES OF BIBR3 AND BI2(SO4)3 WITH IMIDAZOLIDINE-2-THIONE

The paper reports the structural and spectroscopic properties of two complexes between BiBr3, Bi2(SO4)3 and imidazolidine-2-thione (etu) having formulae BiBr3 . 3etu (I) and [Bi(etu)4]2(SO4)3 . 2H2O (II). Complex I is monoclinic, space group P2(1)/n, Z = 4, with a = 8.142(2), b = 15.611(3), c = 16.316(3) angstrom, beta = 97.38(3)-degrees, R = 0.041. II is orthorhombic, space group Pbcn, a = 10.930(1), b = 16.795(1), c = 27.890(1) angstrom, Z = 4 and R = 0.052. In both structures bismuth is octahedrally coordinated, in I three bromines and three sulphurs from etu molecules are present and the coordinated polyhedron is only moderately deformed, while in II four sulphurs of etu ligands and two oxygen sulphate with very different Bi 0 distances 12.413(12) and 2.715(13) angstrom] are present.