Single Crystal X-Ray Diffraction Study of Indium(III) and Gallium(III) Fluoride Complexes MIIAF5·7H2O (M = Co, Ni, Cu, Zn, Cd; A = In, Ga)

Abstract

Crystal structures of CuInF₅·7H₂O and ZnGaF₅·7H₂O are determined. They are composed of centrosymmetric octahedral complex [Cu(1)(H₂O)₆]²⁺ and [Cu(2)(H₂O)₆]²⁺ ([Zn(1)(H₂O)₆]²⁺ and [Zn(2)(H₂O)₆]²⁺ respectively) cations and two types of centrosymmetric octahedral complex [In(1)F₄(H₂O)₂]^– and [In(2)F₆]^3– ([Ga(1)F₄(H₂O)₂]^– and [Ga(2)F₆]^3– respectively) anions. Coordinated H₂O molecules in the complex [In(1)F₄(H₂O)₂]^– and [Ga(1)F₄(H₂O)₂]^– anions are in trans-positions. Branched systems of O–H...F and O–H...O hydrogen bonds organize the structural elements of the studied compounds into a three-dimensional framework. The unit cell parameters of some complex fluorides M^IIAF₅·7H₂O (M = Co, Ni, Cu, Cd; A = In, Ga) are determined by X-ray diffraction of polycrystals and two isostructural series are identified.