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Source of material 0.3 mmol 3-(pyridin-2-yl)-1,2,4-triazole (Hpt) and 0.2 mmol copper acetate were dissolved in 10 ml water. The pH value was adjusted to 6.5 with 0.3 MNaOH solution. The reaction mixture was refluxed for nearly four hours under stirring. After that, the mixture was placed in a25mlhydrothermal autoclave. The vessel was sealted and heated at 430 Kfor 68 h. Afterwards the system was cooled to room temperature. The resultant solution was filtered and the filtrate was kept untouched to evaporate slowly at room temperature. The blue needle-like single crystal suitable for crystal structure determintaion were obtain. Experimental detailsHydrogen atoms bound to carbon atoms were placed in calculted positions and treated as riding on their parent atoms, with d(C-H aromtic)f rom 0.085 to 0. Å and Uiso(H) =1.2 Ueq(C).Hydrogen atoms attached to oxygen of water molecule were initially located in adifference Fourier map and refined. DiscussionIn the past few years, the design and synthesis of inorganicorganic hybrid materials have been increasingly developed for their potential application in catalysis, biology, electrical conductivity, magnetism, and photochemistry [1]. Alot of special structure and properties of coordination polymers are assigned to nitrogen (or oxygen) of bidentate (or polydentate) ligand and metal ions [2]. 3-(Pyridin-2-yl)-1,2,4-triazole (Hpt) is ap olydentate ligand. Acage structure can be formming with the three lone pairs of electrons of the nitrogen atoms chelating the metal ions. The nitrogen atom of the triazole ring with N-Hcan coordinate with the metal ions which take off the hydrogen ions [3].

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