Bis(4'-chloro-2,2':6',2''-terpyridine-κ(3)N,N',N'')ruthenium(II) dichloride dihydrate.

In the cation of the title compound, [Ru(C(15)H(10)ClN(3))(2)]Cl(2)·2H(2)O, the metal atom exhibits a distorted octa-hedral coordination geometry provided by the N atoms of two tridentate terpyridine ligands. The ligands are approximately planar [maximum deviation = 0.156 (5) Å] and form a dihedral angle of 87.0 (3)°. In the crystal, the cations, anions and water mol-ecules are linked into a three-dimensional network by C-H⋯Cl, C-H⋯O and O-H⋯Cl hydrogen bonds.