Silver(I) diaqua­magnesium catena-borodiphosphate(V) monohydrate, AgMg(H2O)2[BP2O8]·H2O

The title compound contains infinite one-dimensional [BP2O8]3− borophosphate helical ribbons, built up from alternate BO4 and PO4 tetra­hedra arranged around the 65 screw axes. The vertex-sharing BO4 and PO4 tetra­hedra form a spiral ribbon of four-membered rings in which BO4 and PO4 groups alternate. The ribbons are connected through slightly distorted MgO4(H2O)2 octa­hedra, in which the four O atoms belong to the phosphate groups. The free threads of the helices are occupied by silver ions, which are in an irregular environment surrounded by six O atoms. The central channels of the helices, running along the c axis, are filled with the water mol­ecules. The structure is stabilized by O—H⋯O hydrogen bonds between the water mol­ecules and O atoms that are part of the helices. The crystal structure of the title compound is isotopic with other analogous borophosphates such as A I M II(H2O)2[BP2O8]·H2O, where A I = Li, Na, K or NH4 + and M II = Mg, Mn, Fe, Co, Ni, Cu, Zn or Cd

A mixed indium–iron lithium diphosphate, In0.51Fe0.49LiP2O7

The structure of In0.51Fe0.49LiP2O7 consists of a three-dimensional network constructed from (InIII/FeIII)O6 octa­hedra and P2O7 groups. Each M IIIO6 octa­hedron is linked to six PO4 tetra­hedra belonging to five different P2O7 groups and shares two corners with the same P2O7 group so as to build infinite chains or rather parallel colums of [M IIIP2O11] running along the a axis. The linkage between these chains or columns defines hepta­gonal tunnels parallel to [100] in which the Li+ ions are located in off-centred positions. The In0.51Fe0.49LiP2O7 compound can be regarded as one composition of the continuous solid solution between LiFeP2O7 and LiInP2O7 whose structure is isotypic with the A IFeP2O7 (A I = Na, K, Rb, Cs and Ag) diphosphate family

Silver indium diphosphate, AgInP2O7

Polycrystalline material of the title compound, AgInP2O7, was synthesized by traditional high-temperature solid-state methods and single crystals were grown from the melt of a mixture of AgInP2O7 and B2O3 as flux in a platinium crucible. The structure consists of InO6 octa­hedra, which are corner-shared to PO4 tetra­hedra into a three-dimensional network with hexa­gonal channels running parallel to the c axis. The silver cation, located in the channel, is bonded to seven O atoms of the [InP2O7] framework with Ag–O distances ranging from 2.370 (2) to 3.015 (2) Å. The P2O7 diphosphate anion is characterized by a P—O—P angle of 137.27 (9) and a nearly eclipsed conformation. AgInP2O7 is isotypic with the M IFeP2O7 (M I = Na, K, Rb, Cs and Ag) diphosphate family

Silver diaquacobalt(II) catena-borodiphosphate(V) hydrate, (Ag0.79Co0.11)Co(H2O)2[BP2O8]·0.67H2O

The structure of the title compound, (Ag0.79Co0.11)Co(H2O)2[BP2O8]·0.67H2O is isotypic to that of its recently published counterparts AgMg(H2O)2[BP2O8]·H2O and (Ag0.57Ni0.22)Ni(H2O)2[BP2O8]·0.67H2O. It consists of infinite borophosphate helical ribbons [BP2O8]3−, built up from alternate BO4 and PO4 tetrahedra arranged around the 65 screw axes. The vertex-sharing BO4 and PO4 tetrahedra form a spiral ribbon of four-membred rings in which BO4 and PO4 groups alternate. The ribbons are connected through slightly distorted CoO4(H2O)2 octahedra whose four O atoms belong to the phosphate groups. The resulting three-dimensional framework is characterized by hexagonal channels running along [001] in which the remaining water molecules are located. The main difference between the Mg-containing and the title structure lies in the filling ratio of Wyckoff positions 6a and 6b in the tunnels. The refinement of the occupancy rate of the site 6a shows that it is occupied by water at 67%, while the refinement of that of the site 6b shows that this site is partially occupied by 78.4% Ag and 10.8% Co, for a total of 82.2%. The structure is stabilized by O—H...O hydrogen bonds between water molecules and O atoms that are part of the helices