Synthesis and structural characterization of bismuth complexes with sulphur-containing ligands: The crystal and molecular structures of two 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 P21/n, Z=4, with a=8.142(2), b=15.611(3), c=16.316(3) Å, β=97.38(3)°, R=0.041. II is orthorhombic, space group Pbcn, a=10.930(1), b=16.795(1), c=27.890(1) Å, 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-O distances [2.413(12) and 2.715(13) Å] are present. © 1992 Plenum Publishing Corporation.