Gulay L D, Daszkiewicz M, Ruda I P, Marchuk O V
Department of Ecology and Protection of the Environment, Volyn National University, Voli Avenue 13, 43009 Lutsk, Ukraine.
Acta Crystallogr C. 2010 Mar;66(Pt 3):i19-21. doi: 10.1107/S0108270110000247. Epub 2010 Feb 3.
Crystals of La(2)Pb(SiS(4))(2), dilanthanum(III) lead(II) bis[tetrasulfidosilicate(IV)], were obtained from the La-Pb-Si-S system and structurally characterized using X-ray single-crystal diffraction. The La and Pb atoms are coordinated in bicapped trigonal prisms of S atoms, with the Si atoms in tetrahedra. An occupational disorder of the La and Pb centres was refined for one position in the structure. The bicapped trigonal prisms and tetrahedra share edges. A gap located 2.629 (1) A from the sulfide anions was found around the coordination polyhedra, which makes La(2)Pb(SiS(4))(2) a prospective material in crystal engineering. The Si and one S atom lie on a threefold axis.
通过La-Pb-Si-S体系得到了二镧（III）铅（II）双[四硫代硅酸根（IV）]（La(2)Pb(SiS(4))(2)）晶体，并利用X射线单晶衍射对其进行了结构表征。La和Pb原子由硫原子在双帽三角棱柱中配位，硅原子在四面体中。对结构中的一个位置细化了La和Pb中心的占位无序。双帽三角棱柱和四面体共享棱边。在配位多面体周围发现了一个距离硫阴离子2.629（1）Å的间隙，这使得La(2)Pb(SiS(4))(2)成为晶体工程中的一种潜在材料。硅原子和一个硫原子位于三重轴上。
