The Role of C—H...O Bonds in Stabilizing 3-Furancarboxylic Acid and its Complexes with Calcium and Strontium

The crystal structures of 3-furancarboxylic acid, C₅H₄O₃, and both its calcium and strontium complexes, catena-poly[diaquacalcium-μ-(3-furancarboxylato-O,O':O)-μ-aqua 3-furancarboxylate], [Ca(C₅H₃O₃)(H₂O)₃](C₅H₃O₃), and catena-poly[diaquastrontium-μ-(3-furancarboxylato-O,O':O)-μ-aqua 3-furancarboxylate], [Sr(C₅H₃O₃)(H₂O)₃](C₅H₃O₃), respectively, are presented. The differences and similarities in the hydrogen-bonding schemes of the title acid and 2-furancarboxylic acid are discussed, and the importance of C—H...O hydrogen bonds in the crystal packing of 3-furancarboxylic acid and its strontium and calcium complexes is highlighted.

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