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In the title one-dimensional coordination polymer, {[Ni(CHO 2 ) 2 (C 20 H 14 N 4 )(H 2 O) 2 ]·2H 2 O}  n  , the Ni II  atom lies on a crystallographic inversion centre. It is coordinated by two formate O atoms, two water O atoms and two N atoms from two 1,4-bis­(1 H -benzimidazol-1-yl)benzene (bzb) ligands, resulting in a distorted  trans -NiN 2 O 4  octa­hedral coordination geometry. The bzb mol­ecule acts as a bridging ligand to connect the metal atoms into a chain propagating in [1]. The dihedral angle between the benzimidazole ring and the central benzene ring in the ligand is 38.16 (9)°. In the crystal, O—H⋯O hydrogen bonds crosslink the chains into (010) sheets.

catena-Poly[[[diaquadiformatonickel(II)]-μ-1,4-bis(1H-benzimidazol-1-yl)benzene] dihydrate]