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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.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks global, 3FA, cafu3, srfu3

fcf

Structure factor file (CIF format)
Contains datablock fu3

fcf

Structure factor file (CIF format)
Contains datablock ca3sym

fcf

Structure factor file (CIF format)
Contains datablock srks

CCDC references: 126321; 126322; 126323

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