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In the title compound, {(C 16 H 22 N 4 )[Co(C 10 H 2 O 8 )(H 2 O) 4 ]·2H 2 O}  n  , the octa­hedrally coordinated Co II  atom is situated on an inversion center and possesses four aqua ligands. The Co atoms are linked into an anionic coordination polymer chain by bis-monodentate pyromellitate ligands. The chain motifs are connected into a supra­molecular layer by hydrogen bonding mediated by uncoordinated water mol­ecules. Charge balance is provided by doubly protonated bis­(4-pyridylmeth­yl)piperazine units, which are anchored to the coordination polymer chain motifs by N—H⋯O hydrogen bonding.

acta crystallographica. section e

Poly[1,4-bis(4-pyridylmethyl)piperazinediium [[tetraaquacobaltate(II)]-μ-pyromellitato-κ2O1:O4] dihydrate]