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

Abstract K 2 {Cu[TeO 4 (OH) 2 ]} · H 2 O 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 . CuO 4 squares and TeO 4 (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 C 2/ c or Cccm resulted in large anisotropic displacement parameters or split positions for K and O w atoms. The {Cu[TeO 4 (OH) 2 ]} chains are connected by potassium atoms and by hydrogen bonds of hydroxil groups (O h …O = 2.643 and 2.650 Å) and water molecules (O w …O = 2.782 and 2.955 Å), respectively.