Poly[triaqua­[μ(4)-3-(4-carboxyl­atophen­oxy)propionato-κ(4) O:O′:O′′:O′′′][μ(3)-3-(4-carboxyl­atophen­oxy)propionato-κ(3) O:O′:O′′]dizinc]

The coordination polymer [Zn(2)(C(10)H(8)O(5))(2)(H(2)O)(3)](n) adopts a layer structure in which the two independent Zn(II) ions exist in trigonal–bipyramidal coordination geometries. One carboxyl­ate dianion binds to a monoaqua-coordinated metal ion through the aliphatic carboxyl­ate end and to the diaqua-coordinated metal ion through the aromatic carboxyl­ate end; the other dianion binds in the reverse manner. Three of the four carboxyl­ate ends of the two dianions are also engaged in bridging inter­actions; these lead to a layer structure parallel to (100). Adjacent layers are linked by O—H(water)⋯O hydrogen bonds into a three-dimensional network.