Crystal structure of the new compound Co6(TeO3)2(TeO6)Cl2

The new compound Co-6(TeO3)(2)(TeO6)Cl-2 has been isolated during an investigation of the system CoO:CoCl2:TeO2. The new compound is deep purple in color and crystallizes in the tetragonal system, space group P4(2)/mbc, a = 8.3871(7) Angstrom, c = 18.5634( 19) Angstrom, Z = 4. The Co(II) ions have octahedral [Co1O(6)] and tetrahedral [Co2O(3)Cl] coordinations. Tellurium is present both as Te(IV) with a tetrahedral [Te1O(3)E] coordination, where E is the 5s(2) lone-pair and as Te(VI) with an octahedral [Te2O(6)] coordination. The structure is made up of intersecting layers of tetrahedra forming channels comprising octahedra chains that run along the c-axis. The new compound is the first cobalt tellurium oxochloride described. (C) 2004 Elsevier SAS. All rights reserved.