A nearly planar arrangement of ions in 4,4′-bipiperidinium tetra­cyanido­platinate(II) monohydrate

The title compound, (C(10)H(22)N(2))[Pt(CN)(4)]·H(2)O, was isolated from solution as a mol­ecular salt. The compound contains discrete 4,4′-bipiperidinium cations and tetra­cyano­platinate(II) anions that are involved in a hydrogen-bonding network with one water mol­ecule of hydration. The structure differs from that of the similar acetonitrile solvate, (C(10)H(22)N(2))[Pt(CN)(4)]·2CH(3)CN, in the orientation of the ions relative to one another. The hydrate reported here contains layers of nearly parallel cations and anions with an angle between their mean planes of only 4.35 (11)°, while in the acetonitrile solvate the cations and anions are nearly perpendicular to one another (86.1° between mean planes). The crystal showed partial inversion twinning.