Received 1 December 2010
In the title mononuclear cadmium complex, [Cd(C10H5O4)2(H2O)2], the CdII atom, located on a crystallographic inversion center, exhibits a slightly distorted octahedral geometry and is six-coordinated by two O atoms from water molecules in the axial positions and four O atoms from two deprotonated coumarin-3-carboxylic acid ligands in the equatorial plane. Angles around the CdII atom vary between 81.00 (5) and 99.00 (0)°. The Cd-O bond lengths vary between 2.1961 (13) and 2.3360 (13) Å. O-HO hydrogen bonds between the H atoms of coordinated water molecules and the O atoms of carboxylate groups link the complex molecules into layers parallel to the ab plane.
For background to topological networks, see: Lin et al. (2010). For applications of self-assembling systems with organic ligands containing O donors, see: Bischof et al. (2010); Chen et al. (2008); Ghoshal et al. (2007); Li & Zhou (2009). For related structures, see: Georgieva et al. (2007); Li et al. (2009).
Data collection: APEX2 (Bruker, 2008); cell refinement: SAINT (Bruker, 2008); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008b); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008b); molecular graphics: SHELXTL (Sheldrick, 2008b); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: ZL2335 ).
This work was supported by the National Natural Science Foundation of China (No. 21075114), the Science and Technology Development Project of Beijing Education Committee and the Special Environmental Protection Fund for Public Welfare project (201009015).
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