Bis(2,2'-bipyridine-κ(2)N,N')(3-methyl-benzoato-κ(2)O,O')zinc 3-methyl-benzo-ate-3-methyl-benzoic acid-water (1/1/2).

The title compound, [Zn(C(8)H(7)O(2))(C(10)H(8)N(2))(2)](C(8)H(7)O(2))·C(8)H(8)O(2)·2H(2)O, is comprised of a Zn(2+) cation, two 2,2'-bipydine (bipy) ligands and one 3-methyl-benzoate anion (L(-)) together with one uncoordinating L(-) anion, one uncoordinating HL mol-ecule and two lattice water mol-ecules. The Zn(II) atom is coordinated by four N atoms of two bipy ligands and two O atoms from one L(-) ligand in a distorted octa-hedral geometry. Pairs of centrosymmetrically related complex mol-ecules form dimers via slipped π-stacking inter-actions between bipy ligands with an inter-planar distance of 3.470 (4) Å. The dimers are linked into supra-molecular chains along [111], via C-H⋯O hydrogen bonds. The uncoordinated L(-) anions, HL mol-ecules and water mol-ecules are connected with each other via O-H⋯O hydrogen bonds, forming chains between the metal complex chains and binding them together via C-H⋯O contacts. The resulting layers parallel to (010) are further assembled into a three-dimensional supra-molecular architecture through additional C-H⋯O inter-actions.