Crystal structure of copper(II) fluoroindate(III) Cu(InF4)2·10H2O

Abstract

A new indium(III) fluoride complex Cu(InF₄)₂·10H₂O with the divalent Cu²⁺ cation is synthesized for first time, and its crystal structure, which is a new type of the structure of complex fluorides of trivalent metals with divalent cations, obtained from a hydrofluoric acid solution, is studied. The structure of Cu(InF₄)₂·10H₂O is monoclinic, space group P2₁/a. The structure is formed by isolated centrosymmetric distorted octahedral complex [Cu(H₂O)₆]²⁺ cations and isolated distorted octahedral complex [InF₄(H₂O)₂]^– anions with the cis arrangement of coordinated water molecules. The branched system of O–H·F hydrogen bonds, which is formed by the coordinated H₂O molecules with the F atoms of anions, combines the structural elements of the compound to form a three-dimensional framework.