(IUCr) Crystallography Journals Online

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Acta Cryst. (2012). E68, m1516-m1517
[ doi:10.1107/S1600536812047034 ]

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

I. H. Hwang, P.-G. Kim, J.-C. Lee, C. Kim and Y. Kim

Abstract: The asymmetric unit of the title compound, [Mn₂(C₆H₆O₇)₂(H₂O)₄]·C₁₂H₁₀N₂·2H₂O, 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-HO and O-HN hydrogen bonds link the centrosymmetric dimers and lattice water molecules into a three-dimensional structure which is further stabilized by intermolecular [pi] - [pi] interactions [centroid-centroid distance = 3.959 (2) Å]. Weak C-HO hydrogen bonding interactions are also observed.