(2,2′-Bipyridine-4,4′-dicarb­oxy­lic acid-κ(2) N,N′)chlorido(2,2′:6′,2′′-terpyridyl-κ(3) N,N′,N′′)ruthenium(II) perchlorate ethanol monosolvate monohydrate

In the title compound, [RuCl(C(15)H(11)N(3))(C(12)H(8)N(2)O(4))]ClO(4)·C(2)H(5)OH·H(2)O, the geometry of the ClN(5) coordination set around the Ru(II) atom is close to octa­hedral, but distorted on account of the limited bite angles of the polypyridyl ligands. The complexes are linked by O—H⋯O hydrogen bonds between the carboxyl groups and the crystal lattice water mol­ecules into chains along [110]. Face-to-face stacking inter­actions are formed between terpyridine ligands, with inter­planar separations of 3.66 (1) and 3.42 (1) Å, and between bipyridine-4,4′-dicarb­oxy­lic acid ligands, with inter­planar separations of 3.65 (1) and 3.72 (1) Å. Three O atoms of the perchlorate ion are each disordered equally over two positions. The hy­droxy group of the ethanol mol­ecule is also disordered over two sites with refined occupancies of 0.794 (9) and 0.206 (9).