Bis(5-hydroxy-2-hydroxymethyl-4-pyrone-kappa 2O4,O5)bis(2-hydroxymethyl-5-oxido-4-pyrone-kappa 2O4,O5)calcium(II) tetrahydrate.

Abstract

In the title compound, [Ca(C(6)H(5)O(4))(2)(C(6)H(6)O(4))(2)].4H(2)O, which is a kojic acid-Ca(2+) complex, the Ca atom is on a twofold axis and is octacoordinated by O atoms from four pyrone ligand molecules. The hydroxyl and ketone O atoms of each ligand form a five-membered chelate ring with the Ca atom. The crystal structure is stabilized by partial stacking and O-H.O hydrogen bonds.