catena-Poly­[[aqua­zinc(II)]-μ-2-carboxyl­ato­phenoxy­acetato]

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 2₁ 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.

mer-Tri­aqua(2-carboxyl­ato­phenoxy­acetato)­cobalt(II)

In the title compound, [Co(C₉H₆O₅)(H₂O)₃], the Co^II atom is coordinated by three O atoms from the 2-carboxyl­ato­phenoxy­acetate ligand in meridional sites, forming chelate rings. The other three coordination sites of the octahedron are occupied by the water mol­ecules.