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In the title coordination polymer, {[Zn(C 8 H 5 NO 4 )(C 3 H 4 N 2 )]·0.25H 2 O}  n  , the Zn 2+  cation has an N 2 O 2  donor set involving two carboxyl­ate O atoms from two 5-amino­isophthalate anions, one N atom from a 5-amino­isophthalate anion, and one imidazole N atom displaying a slightly distorted tetra­hedral geometry with two additional O-atom neighbours, with Zn-to-ligand distances of 2.711 (2) and 2.717 (2) Å, respectively. Each 5-amino­isophthalate anion acts as a μ 3 -bridge linking symmetry-related Zn II  ions into a layered polymeric structure parallel to (100). The asymmetric unit also comprises a disordered crystal water molecule located on an inversion centre with 0.25 occupancy. In the crystal, N—H⋯O hydrogen bonds form a three-dimensional network.

acta crystallographica. section e

Poly[[(μ3-5-aminoisophthalato-κ3O1:O3:N)(1H-imidazole-κN3)zinc] 0.25-hydrate]