Bis(4-methyl-3,5-diphenyl-1H-pyrazole-κN 2)silver(I) nitrate

In the title complex, [Ag(C16H14N2)2]NO3, the geometry around the AgI ion is T-shaped with two short Ag—N bonds to the pyrazole ligand and one long Ag—O bond to the nitrate anion. The crystal structure is stabilized by intermolecular N—H⋯O, C—H⋯O and C—H⋯π interactions.

In the title complex, [Ag(C 16 H 14 N 2 ) 2 ]NO 3 , the geometry around the Ag I ion is T-shaped with two short Ag-N bonds to the pyrazole ligand and one long Ag-O bond to the nitrate anion. The crystal structure is stabilized by intermolecular N-HÁ Á ÁO, C-HÁ Á ÁO and C-HÁ Á Á interactions.

Comment
The chemistry of coinage metals with pyrazole derived ligands has attracted much interest, mainly to their diverse structures and applications in areas such as modeling C-H bond activations. The abundance and variety of pyrazole complexes of copper is in contrast to the small number of the corresponding silver and gold complexes (Rasika Dias et al., 2007). In continuation of our research on pyrazolate complexes (Hossaini Sadr et al., 2008a;Hossaini Sadr et al., 2008b;Hossaini Sadr et al., 2006;Hossaini Sadr et al., 2004), we synthesized the title compound and determined its structure by X-ray diffraction.
The asymmetric unit of the title complex, Fig. 1, comprises a cation complex and a nitrate ion. The bond lengths (Allen, et al., 1987) and angles are within the normal ranges. The geometry around Ag(I) is T-shaped which is coordinated by two pyrazolate ligands and a nitrate ion. The crystal structure is stabilized by the intermolecular N-H···O, C-H···O and C-H···π interactions (Table 1).

Experimental
To an acetone (40 ml) solution of 4-methyl-3,5-diphenyl-1H-pyrazole (0.1 g, 1 mmol) under a dry nitrogen atmosphere, AgNO 3 (0.07 g, 1 mmol) was added and the solution was stirred for 3 h. The resulting mixture was filtered and the precipitate was washed with cold acetone (2 X 10 ml). The bright yellow precipitate was dissolved in acetonitrile and the filtrate was left to evaporate slowly at ambient temperature. Single crystals suitable for X-ray diffraction analysis were obtained after 4 days.

Refinement
All hydrogen atoms were positioned geometrically with C-H = 0.95-0.98 Å and included in a riding model approximation with U iso (H) = 1.2 or 1.5 U eq (C), except the N-bound H atoms which was located from the difference Fourier map and constrained to refine with the parent atom with U iso (H) = 1.2 U eq (N). A rotating model were applied to the methyl groups.  Bis(4-methyl-3,5-diphenyl-1H-pyrazole-κN 2 )silver(I) nitrate Crystal data [Ag(C 16