catena-Poly[[aquazinc(II)]-μ-2-carboxylato-phenoxyacetato]

The - OCH2CO2 arm of the ligand in the title compound, [Zn(C9H6O5)(H2O)](n), uses the single- bond carboxyl O atom, as well as the ether O atom, to chelate to the Zn atom; the other - CO2 arm bridges adjacent Zn atoms into a helical chain that propagates by means of a 2(1) screw axis. The - OCH2CO2 arm features distinct single- and double-bond C - O distances; in the other - CO2 arm, the C - O distances are interpreted in terms of a delocalized carboxyl group. The coordination about zinc is completed by a water molecule, resulting a distorted ZnO5 square-pyramidal arrangement in which the apical position is occupied by water.