Abstract
The title compound, [2,6-(CH3)2C6H3NH3]6P6O18·4H2O, crystallizes in the monoclinic space group P21/c with the unit-cell parameters: a = 13.855(6), b = 17.383(5), c = 12.696(4)Å, β = 92.15(4)°, V = 3135.5(19)Å3, Z = 2 and Dx = 1.355 g cm-3. The atomic arrangement can be described by inorganic layers built of P6O18 rings and water molecules, parallel to the (b, c) plane and between which are located the 2,6-xylidinium cations. The grouping is maintained by different types of interactions (electrostatic, H-bonds and van der Waals).
