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The asymmetric unit of the title compound, (C(3)H(12)N(2))[Zn(C(7)H(3)NO(5))(2)]·3.5H(2)O, contains two formula units. The compound consists of an anionic complex, a doubly protonated propane-1,3-diamine as a counter-ion and 3.5 uncoord-inated water mol-ecules. The coordination polyhedron around the Zn(II )atom is distorted octa-hedral, defined by four O atoms and two N atoms from two Hchel (H(3)chel = 4-hydroxy-pyridine-2,6-dicarboxylic acid) ligands. In the crystal structure, O-H⋯O, N-H⋯O and C-H⋯O hydrogen bonds along with π-π stacking inter-actions [centroid-centroid distance = 3.473 (2) Å] are observed to reinforce the crystal cohesion.

(Propane-1,3-diammonium) bis(4-hydroxypyridine-2,6-dicarboxylato-κ3O2,N,O6)zinc(II) 3.5-hydrate

(Propane-1,3-diammonium) bis(4-hydroxypyridine-2,6-dicarboxylato-κ³O²,N,O⁶)zinc(II) 3.5-hydrate