[1H-1,2,4-Triazole-5(4H)-thione-κS]bis(triphenylphosphane-κP)(nitrato-κO)silver(I) methanol monosolvate

In the title complex, [Ag(NO3)(C2H3N3S)(C18H15P)2]·CH3OH, the AgI ion exhibits a distorted tetrahedral coordination geometry formed by two P atoms from two triphenylphosphine ligands, one S atom from a 1H-1,2,4-triazole-5(4H)-thione ligand and one O atom from a nitrate ion. In the crystal, complex and solvent molecules are linked by O—H⋯O and N—H⋯O hydrogen bonds forming a chain along the b-axis direction. The chains are linked by weak C—H⋯O hydrogen bonds forming a two-dimensional supramolecular architecture parallel to (001). In addition, an intramolecular N—H⋯O hydrogen bond is observed.

In the title complex, [Ag(NO 3 )(C 2 H 3 N 3 S)(C 18 H 15 P) 2 ]Á-CH 3 OH, the Ag I ion exhibits a distorted tetrahedral coordination geometry formed by two P atoms from two triphenylphosphine ligands, one S atom from a 1H-1,2,4triazole-5(4H)-thione ligand and one O atom from a nitrate ion. In the crystal, complex and solvent molecules are linked by O-HÁ Á ÁO and N-HÁ Á ÁO hydrogen bonds forming a chain along the b-axis direction. The chains are linked by weak C-HÁ Á ÁO hydrogen bonds forming a two-dimensional supramolecular architecture parallel to (001). In addition, an intramolecular N-HÁ Á ÁO hydrogen bond is observed.  Table 1 Hydrogen-bond geometry (Å , ). Financial support from the Science Achievement Scholarship of Thailand (SAST) and the Department of Chemistry, Prince of Songkla University, are gratefully acknowledged. We metal-organic compounds 1. Comment 1,2,4-Triazoles and their derivatives are compounds of considerable interest because of variety of biological properties such as antimicrobial, antiviral, anticonvulsant, activities, anti fungal and antitumor (Holla et al., 1998;Jones et al., 1988;Kömürcü et al., 1995;Küçükgüzel et al., 2001) and also potent inhibitors of enzymes. Therefore, some are approved as drugs, for example, alprazolam, etizolam, or vibrunazole (Wujec & Paneth, 2007).

Related literature
The coordination chemistry of silver(I) complexes with phosphorus and sulfur donor ligands has attracted great interest in recent years because of their potential applications due to antimicrobial activities and they also often show interesting luminescence properties (Ferrari et al., 2007;Isab et al., 2010). Herein, the crystal structure of a mononuclear silver(I) nitrate complex containing both triphenylphosphine and 1H-1,2,4-triazole-5(4H)-thione is described.

Experimental
Triphenylphosphine, PPh 3 , (0.31g,1.18 mmol) was dissolved in 30 cm 3 of methanol at 333 K. AgNO 3 (0.10g,0.59 mmol) was added and the mixture was stirred for 3 hours. 1H-1,2,4-Triazole-5(4H)-thione, (0.06g,0.59 mmol) was added and new reaction mixture was heated under reflux for 3 hours. The resulting clear solution was filtered off and left to evaporate at room temperature. Colorless crystal, which was deposited upon standing for few days, was filtered off and dried under reduced pressure.

Figure 1
The molecular structure with displacement ellipsoids drawn at the 50% probability level. All hydrogen atoms are omitted for clarity.

Figure 2
Part of the crystal structure showing intermolecular hydrogen bonds (red dashed lines) forming a 1-D chain.  Part of the crystal structure with hydrogen bonds shown as dashed lines.

[1H-1,2,4-Triazole-5(4H)-thione-κS]bis(triphenylphosphane-κP)(nitrato-κO)silver(I) methanol monosolvate
Special details Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes.