Key indicators: single-crystal X-ray study; T = 296 K; mean (C-C) = 0.003 Å; R factor = 0.034; wR factor = 0.106; data-to-parameter ratio = 13.1.In the title compound, {[Na(C 8 H 9 N 2 O 4 )(H 2 O)]Á0.5H 2 O} n , the Na + ion is coordinated by two bridging water molecules, one N atom and three O atoms from three 4-carboxy-2-propyl-1H-imidazole-5-carboxylate (H 2 pimdc) ligands. Adjacent Na + ions are linked alternately by two water O atoms and two carboxy O atoms into a chain along [001]. These chains are connected through the coordination of the carboxylate O atoms to the Na + ions, forming a three-dimensional structure. An intramolecular O-HÁ Á ÁO hydrogen bond and intermolecular N-HÁ Á ÁO and O-HÁ Á ÁO hydrogen bonds are present in the crystal structure. Related literature ExperimentalCrystal data [Na(C 8 Data collectionBruker APEX CCD diffractometer Absorption correction: multi-scan (SADABS; Sheldrick, 1996) T min = 0.528, T max = 0.562 5971 measured reflections 1986 independent reflections 1669 reflections with I > 2 (I) R int = 0.020

Source of materialAm ixture of pyridine-2,5-dicarboxylic acid (2.0 mmol, 0.3342 g), gadolinium oxide (1.0 mmol, 0.3625 g), zinc chloride (1.0 mmol, 0,1363 g), KOH (2.0 mmol, 0.102 g), and H 2 O (10 mL) was placed in aTeflon-lined autoclave heated to 433 K for three days. The autoclave was then allowed to cool to room temperature. Colorlessc rystalsw ere collected by filtration and washed repeatedly with distilled water and diethyl ether.

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