Disilver(I) trinickel(II) hydrogenphos-phate bis-(phosphate), Ag(2)Ni(3)(HPO(4))(PO(4))(2)

Abstract

The title compound, Ag(2)Ni(3)(HPO(4))(PO(4))(2), has been synthesized by the hydro-thermal method. Its structure is formed by two types of chains running along the b axis. The first chain results from a linear and continuous succession of NiO(6) octa-hedra linked to PO(4) tetra-hedra by a common vertex. The second chain is built up from two adjacent edge-sharing octa-hedra (dimers) whose ends are linked to two PO(4) tetra-hedra by a common edge. Those two types of chains are linked together by the phosphate groups to form polyhedral sheets parallel to the (001) plane. The three-dimensional framework delimits two types of hexa-gonal tunnels parallel to the a-axis direction, at (x, 1/2, 0) and (x, 0, 1/2), where the Ag atoms are located. Each silver cation is surrounded by eight O atoms. The same Ag(+) coordination is found in other phosphates with the alluaudite structure, for example, AgMn(3)(PO(4))(HPO(4))(2). Moreover, O-H⋯O hydrogen bonds link three PO(4) tetra-hedra so as to build a three-dimensional network.

Fig. 1.

Partial plot of Ag2Ni3(HPO4)(PO4)2 crystal structure. Displacement ellipsoids are drawn at the 50% probability level. Symmetry codes: (i) -x, -y + 1, z; (ii) x + 1/2, -y + 1, z; (iii) x, -y + 3/2, z - 1/2; (iv) -x + 1/2, -y + 3/2, z - 1/2; (v) -x + 1/2, -y + 1/2, z - 1/2; (vi) -x, y + 1/2, z - 1/2; (vii) x + 1/2, y + 1/2, z - 1/2; (viii) x, -y + 1/2, z - 1/2; (ix) -x, -y, z; (x) -x, y + 1/2, z + 1/2; (xi) x, -y + 1/2, z + 1/2; (xii) -x + 1/2, y, z.

Fig. 2.

View along the b axis of polyhedral sheets parallel to the (0 0 1) plane.

Fig. 3.

A three-dimensional polyhedral view of the crystal structure of the Ag2Ni3(HPO4)(PO4)2, showing tunnels running along the a direction, at x, 1/2, 0 and x, 0, 1/2.