Structural investigations on bismuth–thiourea derivative adducts: crystal structures of tetra[1-allyl-3-(2-pyridyl)thiourea-S]di-µ-chloro-tetrachlorodibismuth(III) and hexa[1-allyl-3-(2-pyridyl)thiourea-S]bismuth(III) nitrate

Abstract

The crystal structures of [{BiCl₃(aptu)₂}₂](1)[aptu = 1-allyl-3-(2-pyridyl)thiourea-S] and of [Bi(aptu)₆][NO₃]₃(2) have been determined from three-dimensional X-ray data and refined by least-squares methods to R= 0.056 and 0.092 respectively. Both crystals are triclinic with unit-cell dimensions: (1), a= 12.903(10), b= 11.084(10), c= 9.739(10)Å, α= 109.8(1), β= 97.5(1), γ= 107.3(1)°, Z= 1, space group P; (2), a= 13.104(10), b= 15.296(10), c= 11.591(10)Å, α= 126.7(1), β= 109.1(1), γ= 92.4(1)°, Z= 1, pace group P. The structure of (1) consists of a binuclear centrosymmetric neutral complex, in which each bismuth atom is surrounded by two sulphurs of the ligand molecules and two chlorine atoms; two other chlorines, forming asymmetrical bridges, complete the distorted octahedral co-ordination. In (2)[Bi(aptu)₆]³⁺ and NO₃^– ions are present. The heavy atom, lying on the centre of symmetry at the origin of the cell, is surrounded by six sulphur atoms from aptu molecules which are arranged in approximate symmetry to give a distorted octahedral co-ordination.