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The structure framework of the title compound, (Ag 0.57 Ni 0.22 )Ni(H 2 O) 2 [BP 2 O 8 ]·0.67H 2 O, is the same as that of its recently published counterpart AgMg(H 2 O) 2 [BP 2 O 8 ]·H 2 O. In the title structure, the Ag, Ni, B and one O atom are located on special positions (sites symmetry 2). The structure consists of infinite borophosphate helical [BP 2 O 8 ] 3−  ribbons, built up from alternate BO 4  and PO 4  tetra­hedra arranged around the 6 5  screw axes. The vertex-sharing BO 4  and PO 4  tetra­hedra form a spiral ribbon of four-membered rings in which BO 4  and PO 4  groups alternate. The ribbons are connected through slightly distorted NiO 4 (H 2 O) 2  octa­hedra, four O atoms of which belong to the phosphate groups. The resulting three-dimensional framework is characterized by hexa­gonal channels running along [001]. However, the main difference between the structures of these two compounds lies in the filling ratio of Wyckoff positions 6 a  and 6 b  in the tunnels. Indeed, in this work, the refinement of the occupancy rate of sites 6 a  and 6 b  shows that the first is occupied by water at 67% and the second is partially occupied by 56.6% of Ag and 21.6% of Ni. In the AgMg(H 2 O) 2 [BP 2 O 8 ]·H 2 O structure, these two sites are completely occupied by H 2 O and Ag + , respectively. The title structure is stabilized by O—H⋯O hydrogen bonds between water mol­ecules and O atoms that are part of the helices.

acta crystallographica. section e

Silver(I) diaquanickel(II)catena-borodiphosphate(V) hydrate, (Ag0.57Ni0.22)Ni(H2O)2[BP2O8]·0.67H2O