The crystal structure of K2{Cu[TeO4(OH)2]} · H2O

H. Effenberger and E. Tillmanns

Abstract

K2{Cu[TeO4(OH)2]} · H2O was synthesized under moderate hydrothermal conditions. The structure was solved from single crystal X-ray data; a = 9.589(2), b = 6.235(1), c = 12.014(3) Å, β = 90.44(2)°, space group Cc, wR(F) = 0.038 for 2875 observed reflections with sin([unk]/λ < 0.90 Å−1. CuO4 squares and TeO4(OH)2 octahedra alternatingly share O–O edges to form chains in [110]. This part of the structure is pseudocentrosymmetric and shows in addition an approximate Cccm symmetry. The higher symmetry is violated by hydrogen bonds; refinements in C2/c or Cccm resulted in large anisotropic displacement parameters or split positions for K and Ow atoms. The {Cu[TeO4(OH)2]} chains are connected by potassium atoms and by hydrogen bonds of hydroxil groups (Oh…O = 2.643 and 2.650 Å) and water molecules (Ow…O = 2.782 and 2.955 Å), respectively.

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Zeitschrift für Kristallographie – Crystalline Materials offers a place for researchers to present results of their crystallographic studies. The journal includes theoretical as well as experimental research. It publishes Original Papers, Letters and Review Articles in manifold areas of crystallography.

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