Poly[(μ4-1,2,3-benzothiadiazole-7-carboxylato)silver(I)]

In the crystal structure of the title compound, [Ag(C7H3N2O2S)]n, the AgI atom is coordinated by two N atoms and three O atoms of four organic ligands forming a distorted square pyramid. The carboxylate group acts as a bidentate ligand on one AgI atom and as a bridging group for a symmetry-related AgI atom, forming a dimer. Futhermore, the two N atoms of two thiadiazole rings bridge a third symmetry-related AgI atom, forming a six-membered ring. These two frameworks, AgO2Ag and AgN4Ag, extend in three directions, forming a three-dimensionnal polymer. The whole polymer is organized around inversion centers.

In the crystal structure of the title compound, [Ag(C 7 H 3 -N 2 O 2 S)] n , the Ag I atom is coordinated by two N atoms and three O atoms of four organic ligands forming a distorted square pyramid. The carboxylate group acts as a bidentate ligand on one Ag I atom and as a bridging group for a symmetry-related Ag I atom, forming a dimer. Futhermore, the two N atoms of two thiadiazole rings bridge a third symmetryrelated Ag I atom, forming a six-membered ring. These two frameworks, AgO 2 Ag and AgN 4 Ag, extend in three directions, forming a three-dimensionnal polymer. The whole polymer is organized around inversion centers.

Comment
Metal organic complexes have drawn much attentions owing to their various structures and their interesting properties (Yaghi et al., 2003). As a bridging ligand benzo[d][1,2,3]thiadiazole-7-carboxylate (L) with three types of heteroatoms has been less investigated. Here we reported the structure of the title complex.
In the title compound, Ag I is coordinated by two N atoms and three oxygen atoms of four organic ligands forming a distorted square pyramid. The carboxylate group acts as a bidentate ligand on one silver atom and as a bridging group for a symmetry related silver forming a dimer. Futhermore the two nitrogen atoms of two thiadiazole rings bridge a third symmetry related Ag atom forming a six membered ring (Fig. 1). The Ag-O and Ag-N distances are in good agreement with the values observed in related Ag I complexes (Chen et al., 2005;Ng & Othman, 1997;Brammer et al., 2002) . The thiadiazole groups bridge two Ag I anions using two nitrogen atoms living the sulfur atoms uncoordinated. In the dimer formed by the carboxylate group, Ag···Ag distance is 3.1168 (12)Å.
The two frameworks AgO2Ag and AgN4Ag extend in the three direction to form a three dimensionnal polymer (Fig. 2) .The whole polymer is organised around inversion centers.

Experimental
A mixture of Ag(I)nitrate (1.5mmol), benzo[d][1,2,3]thiadiazole-7-carboxylate acid (0.75 mmol), in 10 ml water solvent was sealed in a Teflon-lined stainless-steel Parr bomb that was heated at 413 K for 48 h. Red crystals of the title complex were collected after the bomb was allowed to cool to room temperature.Yield 20% based on metal salte.

Figures
Crystal data [Ag(C 7

Special details
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.
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 Rfactors(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.
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 )