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

Abstract

The title compound, Ag 2Ni 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. © Assani et al. 2011.