Bis(dihydrogen norfloxacinium) tri-μ(2)-chlorido-bis­[trichloridobismuthate(III)] chloride dihydrate

The title compound, {systematic name: (3-carb­oxy-1-ethyl-6-fluoro-7-piperazin-4-ium-1-yl-1H-quinolin-4-yl­idene)oxonium tri-μ(2)-chlorido-bis­[trichloridobismuthate(III)] chloride dihydrate], (C(16)H(20)FN(3)O(3))(2)[Bi(2)Cl(9)]Cl·2H(2)O, is composed of [Bi(2)Cl(9)](3−) anions lying on crystallographic twofold rotation axes, Cl(−) anions also on twofold axes, C(16)H(20)FN(3)O(3) (2+) cations, and water mol­ecules. The Bi(III) coordination polyhedron is a distorted octa­hedron and two such octa­hedra share a triangular face to form the complex anion. There are three short terminal Bi—Cl bonds [2.5471 (6)–2.5781(5 Å] and three longer bridging bonds [2.8599 (5)–2.9984 (6) Å] in each octa­hedron. Anions, cations and water mol­ecules are linked by hydrogen bonds to form a three-dimensional network. There are also π–π stacking inter­actions between quinoline ring systems, with an inter­planar distance of 3.27 (1) Å.