Received 23 June 2011
In the title complex, [Ca(C10H6NO4)2(H2O)2]n, the CaII atom lies on a twofold rotation axis and adopts a dodecahedral geometry. The CaII atom is octacoordinated by two O atoms from two water molecules and six O atoms from four acetate ligands. Each acetate acts as a tridentate ligand bridging two CaII atoms, resulting in a chain running along the c axis. O-HO and C-HO hydrogen bonds connect the chains into a two-dimensional network parallel to . - interactions between adjacent isoindoline-1,3-dione rings [centroid-centroid distance = 3.4096 (11) Å] further consolidate the structure. One of the carboxylate O atoms is disordered over two sites in a 0.879 (12):0.121 (12) ratio.
Data collection: APEX2 (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008b); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008b); molecular graphics: Mercury (Macrae et al., 2008); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: PV2422 ).
SS is grateful to the University of Hong Kong for providing facilities for crystallographic studies.
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