| Summary: | The biomolecule chelidonic acid (H<sub>2</sub>chel, 4-oxo-4<i>H</i>-pyran-2,6-dicarboxylic acid) has been used to build new coordination polymers with the bridging <i>N</i>,<i>N</i>’-ligands 4,4′-bipyridine (4,4-bipy) and 1,2-bis(4-pyridyl)ethane (bpe). Four compounds have been obtained as single crystals: 1D cationic coordination polymers [M(4,4-bipy)(OH<sub>2</sub>)<sub>4</sub>]<sup>2+</sup> with chelidonate anions and water molecules in the second coordination sphere in <sup>1</sup><sub>∞</sub>[Zn(4,4-bipy)(H<sub>2</sub>O)<sub>4</sub>]chel·3H<sub>2</sub>O (<b>2</b>) and in the two pseudopolymorphic <sup>1</sup><sub>∞</sub>[Cu(4,4-bipy)(H<sub>2</sub>O)<sub>4</sub>]chel·nH<sub>2</sub>O (<i>n</i> = 3, <b>4a</b>; <i>n</i> = 6, <b>4b</b>), and the 2D neutral coordination polymers <sup>2</sup><sub>∞</sub>[Zn(chel)(4,4-bipy)(H<sub>2</sub>O)]·2H<sub>2</sub>O (<b>1</b>) and <sup>2</sup><sub>∞</sub>[Zn(chel)(bpe)(H<sub>2</sub>O)]·H<sub>2</sub>O (<b>3</b>) where the chelidonate anion acts as a bridging ligand. The effects of the hydrogen bonds on the crystal packing were analyzed. The role of the water molecules hosted within the crystals lattices was also studied.
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