RESUMO
The asymmetric unit of the title hydrated complex salt, (C18H14N5)2[Pt(CN)4]·4H2O, consists of one 2-[2,5-bis-(pyridin-2-yl)-1H-imidazol-4-yl]pyridinium cation, half a tetra-cyanidoplatinate(II) dianion, which is located about a crystallographic inversion center, and two water mol-ecules of crystallization. The Pt(II) atom has a square-planar coordination environment, with Pt-CCN distances of 1.992â (4) and 2.000â (4)â Å. In the cation, there is an N-Hâ¯N hydrogen bond linking adjacent pyridinium and pyridine rings in positions 4 and 5. Despite this, the organic component is non-planar, as shown by the dihedral angles of 10.3â (2), 6.60â (19) and 15.66â (18)° between the planes of the central imidazole ring and the pyridine/pyridinium substituents in the 2-, 4- and 5-positions. In the crystal, cations and anions are linked via O-Hâ¯O, O-Hâ¯N and N-Hâ¯O hydrogen bonds, forming a three-dimensional network. Additional π-π, C-Hâ¯O and C-Hâ¯N contacts provide stabilization to the crystal lattice.