catena-Poly[[[aqua­zinc(II)]-μ-6-[bis­(2-pyridylmethyl)amino]caproato] perchlorate]

The tetra­dentate Schiff base carboxyl­ate-containing ligand bis­(2-pyridylmeth­yl)amino-6-caproic acid (Hpmca) reacts with zinc(II) perchlorate to give the title one-dimensional zinc(II) complex, {[Zn(C₁₈H₂₂N₃O₂)(H₂O)](ClO₄)}_n or {[Zn(μ-pmca)(H₂O)](ClO₄)}_n. Each Zn^II ion has a distorted octa­hedral geometry, being coordinated by three N atoms of the ligand, two O atoms belonging to another ligand, and one water mol­ecule.