Bis(μ-2-carb­oxy­methyl-2-hy­droxy­butane­dioato)bis­[diaqua­manganese(II)]–1,2-bis­(pyridin-4-yl)ethene–water (1/1/2)

The asymmetric unit of the title compound, [Mn(2)(C(6)H(6)O(7))(2)(H(2)O)(4)]·C(12)H(10)N(2)·2H(2)O, contains half of the centrosymmetric Mn complex dimer, half of a 1,2-bis­(pyridin-4-yl)ethene mol­ecule, which lies across an inversion center, and one water mol­ecule. Two citrate ligands bridge two Mn(II) ions, and each Mn(II) atom is coordinated by four O atoms from the citrate ligands (one from hy­droxy and three from carboxyl­ate groups) and two water O atoms, forming a distorted octa­hedral environment. In the crystal, O—H⋯O and O—H⋯N hydrogen bonds link the centrosymmetric dimers and lattice water mol­ecules into a three-dimensional structure which is further stabilized by inter­molecular π–π inter­actions [centroid–centroid distance = 3.959 (2) Å]. Weak C—H⋯O hydrogen bonding interactions are also observed.