Acta Cryst. (2007). E63, i146-i147  [ doi:10.1107/S1600536807024014 ]

The solid solution Co_3.6Mg_1.4Cl₂(TeO₃)₄

R. Takagi, D. T. Hjelmqvist and M. Johnsson

Abstract: Single crystals of the cobalt magnesium dichloride tetrakis[trioxotellurate(IV)] solid solution Co_5-yMg_y(TeO₃)₄Cl₂ [y = 1.4] were obtained from solid-gas phase reactions in sealed evacuated silica tubes. The crystal symmetry is monoclinic and the compound is isostructural with Co₅(TeO₃)₄X₂ and Ni₅(TeO₃)₄X₂ (X = Cl, Br). The layered structure comprises distorted MO₆ and MO₅Cl octahedra (M = statistically occupied Co and Mg sites) and TeO₃E tetrahedra (E = stereochemically active electron lone pair of Te^IV). Five face-sharing MO₆ octahedra make up claw-like [M₅O₁₆Cl₂] units which form layers by corner-sharing with four other such units and by corner- and edge-sharing with TeO₃E tetrahedra. The layers are held together only by weak van der Waals forces with a closest TeCl distance of 3.184 (2) Å between two layers.

Online 26 May 2007

Copyright © International Union of Crystallography
IUCr Webmaster