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The asymmetric unit of the title compound, [NiCl2(C10H14N4)2]n, consists of one Ni2+ ion which is located on an inversion center, one 1,4-bis(imidazol-1-yl)butane (bimb) and one chloride ion. The Ni2+ ion exhibits a distorted octahedral coordination environment defined by four N atoms from four bimb ligands in the equatorial plane and two chloride ions in axial positions. The bridging coordination mode of the bimb ligands leads to the formation of interpenetrating square Ni4(bimb)4 units that are arranged parallel to (001). The separation between the Ni atoms in these units is 13.740 (3) Å.