Potassium nickel(II) gallium phosphate hydrate, K[NiGa(2)(PO(4))(3)(H(2)O)(2)]

The title compound, potassium nickel(II) digallium tris­(phosphate) dihydrate, K[NiGa(2)(PO(4))(3)(H(2)O)(2)], was synthesized hydro­thermally. The structure is constructed from distorted trans-NiO(4)(H(2)O)(2) octa­hedra linked through vertices and edges to GaO(5) trigonal bipyramids and PO(4) tetra­hedra, forming a three-dimensional framework of formula [NiGa(2)(PO(4))(3)(H(2)O)(2)](−). The K, Ni and one P atom lie on special positions (Wyckoff position 4e, site symmetry 2). There are two sets of channels within the framework, one running parallel to the [10[Image: see text]] direction and the other parallel to [001]. These inter­sect, forming a three-dimensional pore network in which the water mol­ecules coordinated to the Ni atoms and the K(+) ions required to charge balance the framework reside. The K(+) ions lie in a highly distorted environment surrounded by ten O atoms, six of which are closer than 3.1Å. The coordinated water mol­ecules are within hydrogen-bonding distance to O atoms of bridging Ga—O—P groups.