catena-Poly[[[aqua(2-methyl-4-oxo-4H-pyran-3-olato-kappaO3,O4)copper(II)]-mu-chloro] monohydrate].

In the title complex, [Cu(C(6)H(5)O(3))Cl(H(2)O)].H(2)O(n), the Cu(II) atom has a deformed square-pyramidal coordination geometry formed by two O atoms of the maltolate ligand, two bridging Cl atoms and the coordinated water O atom. The Cu atoms are bridged by Cl atoms to form a polymeric chain. The deprotonated hydroxyl and ketone O atoms of the maltolate ligand form a five-membered chelate ring with the Cu atom. Stacking interactions and hydrogen bonds exist in the crystal.