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The asymmetric unit of the polymeric title compound, {[Zn(C 8 H 12 N 6 )(H 2 O) 4 ](C 14 H 8 O 4 )}  n   or {[Zn(BTB)(H 2 O) 4 ](BPDC)}  n   [BTB is 1,4-bis­(1,2,4-triazol-1-yl)butane and H 2 BPDC is biphenyl-4,4′-dicarb­oxy­lic acid], contains half a [Zn(BTB)(H 2 O) 4 ] 2+  cation and half a BPDC anion, both ions lying about a crystallographic inversion centre. The crystal structure consists of zigzag polymeric cationic chains parallel to the  c  axis and uncoordinated anions linked into a three-dimensional supra­molecular architecture by O—H⋯O, C—H⋯O hydrogen bonds and C—H⋯π inter­actions.

acta crystallographica. section e

catena-Poly[[[tetraaquazinc(II)]-μ-1,4-bis(1,2,4-triazol-1-yl)butane-κ2N4:N4′] biphenyl-4,4′-dicarboxylate]