Tetrahalogenotellurate(II): Synthese und Kristallstrukturen von Verbindungen mit den Ionen TeX42- (X = Cl, Br, I)/Tetrahalotellurates(II): Syntheses and Crystal Structures of Compounds with TeX42- Ions (X = Cl, Br, I)

TLDR: In this paper, the structures of 1-3 were determined from single crystal X-ray data, and the structure of 2-3 Te(II) exhibits a square planar coordination and Te-I bond lengths were found to be 260.7 (mean), 275.3, and 298.5 pm.

Abstract: The compounds [(C₆H₅)₄As]₂ TeCl₄ (1), [(C₂H₅)₄ N]₂ TeBr₄ · CH₃CN (2), and [(C₂H₅)₄N]₂TeI₄ (3) were prepared by the reaction of Te, X₂ , and excess (C₂H₅)₄NX (X = Br, I) in acetonitrile solution or by heating of [(C₆H₅)₄ As]₂TeCl₆ , Te, and (C₆H₅)₄ ASCl for several hours in the same solvent.The structures of 1-3 were determined from single crystal X-ray data.1 crystallizes in the monoclinic space group P2₁/n with a = 1061.8(2), b = 1614.2(3), c = 1341.7(3) pm, β = 94.21° and Z = 2; 2: tetragonal, P4/mmm, a = 1039.7(2), c = 690.5(1), Z = 1; 3: tetragonal, I4/mmm, a = 1061.7(2), c = 1342.8(4), Z = 2. In 1-3 Te(II) exhibits a square planar coordination. The Te -CI, Te -Br, and Te-I bond lengths were found to be 260.7 (mean), 275.3, and 298.5 pm, respectively.