Received 8 November 2012
aDepartment of Fine Chemistry, Seoul National University of Science & Technology, Seoul 139-743, Republic of Korea,bDepartment of Forest & Environment Resources, Kyungpook National University, Sangju 742-711, Republic of Korea,cDepartment of Forest Resources Development, Korea Forest Research Institute, Suwon 441-350, Republic of Korea, and dDepartment of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Republic of Korea
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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 MnII ions, and each MnII 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 - interactions [centroid-centroid distance = 3.959 (2) Å]. Weak C-HO hydrogen bonding interactions are also observed.
For interactions of metal ions with biologically active molecules, see: Daniele et al. (2008); Parkin (2004); Tshuva & Lippard (2004); Stoumpos et al. (2009). For manganese citrate and zinc citrate complexes, see: Hwang et al. (2012a,b). For related complexes, see: Yu et al. (2009); Kim et al. (2011).
Data collection: SMART (Bruker, 1997); cell refinement: SAINT (Bruker, 1997); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: SJ5281 ).
Financial support from Forest Science & Technology Projects (S121012L080111) and the Converging Research Center Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2012001725) is gratefully acknowledged.
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