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The title compound, [Zn2(C6H4N5)2(H2O)6](CF3CO2)2·H2O, was synthesized by hydrothermal reaction of ZnBr2, CF3COOH and 2-(2H-tetrazol-5-yl)pyridine. The ZnII cation is coordinated by one N atom from the 5-(2-pyridyl)tetrazolate anion, two N atoms from another 5-(2-pyridyl)tetrazolate anion and three O atoms from three water molecules in a distorted octahedral geometry. The tetrazole ligands bridge the metal ions of the dimeric structure, and the dimers are located on crystallographic inversion centers. An interstitial solvent water molecule is located on a crystallographic mirror plane, and the CF3COO− counter-anions are also not coordinated to the metal complex. The F atoms of the anions are disordered with the F atoms statistically distributed over two positions in a 0.56 (3)/0.44 (3) ratio. All the water H atoms are involved in O—H...N and O—H...O hydrogen bonds with uncoordinated water O atoms, carboxylate O atoms and tetrazole N atoms. The interactions link the molecules into a three-dimensional network.