Poly[diaquabis{μ-5-[4-(1H-imidazol-1-ylmethyl)phenyl]tetrazolato}copper(II)]

In the title compound, [Cu(C11H9N6)2(H2O)2]n, the CuII atom lies on an inversion center and is coordinated by four N atoms from four 5-[4-(1H-imidazol-1-ylmethyl)phenyl]tetrazolate ligands and two water molecules in a distorted octahedral geometry. The ligands bridge the CuII atoms, leading to the formation of a two-dimensional network parallel to (100). The structure is further stabilized by O—H⋯N hydrogen bonds within the network.

In the title compound, [Cu(C 11 H 9 N 6 ) 2 (H 2 O) 2 ] n , the Cu II atom lies on an inversion center and is coordinated by four N atoms from four 5-[4-(1H-imidazol-1-ylmethyl)phenyl]tetrazolate ligands and two water molecules in a distorted octahedral geometry. The ligands bridge the Cu II atoms, leading to the formation of a two-dimensional network parallel to (100). The structure is further stabilized by O-HÁ Á ÁN hydrogen bonds within the network.

Experimental
Crystal data [Cu(C 11

Poly[diaquabis{µ-5-[4-(1H-imidazol-1-ylmethyl)phenyl]tetrazolato}copper(II)] Yuan Li and Ruizhan Chen Comment
Metal-organic architectures constructed by flexible, multifunctional ligands often exhibit structural diversity (Song et al., 2012;Wang et al., 2010). Metal-azolate frameworks, being composed of transition metal ions and deprotonated fivemembered heterocycles, are regarded as a great achievement in understanding supramolecular isomerism (Masciocchi et al., 2005). The azolate nitrogen donors can be presicely controlled as coordination and guest binding sites. In addition to the strong coordination ability toward transition metal ions, azolate ligands also combine the negative charge of carboxylates and predictable coordination modes of pyridines. Recently, we obtained the title complex by the reaction of copper chloride with 5-(4-imidazol-1-yl-benzyl)-2H-tetrazole using hydrothermal method and its crystal structure is reported here.
In the title compound, the Cu II atom lies on an inversion center and adopts a distorted octahedral coordination geometry, being coordinated by four N atoms from four azolate ligands and two water molecules ( Fig. 1, Table 1). The Cu-O and Cu-N bond lengths and the bond angles are in the normal range (Zhang et al., 2006). The bridging azolate ligands allow the formation of a two-dimensional network parallel to (1 0 0) (Fig. 2). The crystal structure is further stabilized by O-H···N hydrogen bonds within the network (Table 2).

Figure 2
View of the two-dimensional network.

Poly[diaquabis{µ-5-[4-(1H-imidazol-1-ylmethyl)phenyl]tetrazolato}copper(II)]
Crystal data [Cu(C 11  Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.