Bis(quinolin-8-ol)silver(I) 2-hydroxy-3,5-dinitrobenzoate

The title compound, [Ag(C9H7NO)2](C7H3N2O7), was prepared from 3,5-dinitrosalicylic acid (DNS), quinolin-8-ol and AgNO3. The AgI atom is coordinated by two N atoms and two O atoms from two quinolin-8-ols in a roughly planar [maximum deviation = 0.223 (2) Å] environment. The two quinolin-8-ol ligands are bent slightly with respect to each other, making a dihedral angle of 9.55 (9)°. The DNS anion interacts with the silver complex through O—H⋯O hydrogen bonds

The title compound, [Ag(C 9 H 7 NO) 2 ](C 7 H 3 N 2 O 7 ), was prepared from 3,5-dinitrosalicylic acid (DNS), quinolin-8-ol and AgNO 3 . The Ag I atom is coordinated by two N atoms and two O atoms from two quinolin-8-ols in a roughly planar [maximum deviation = 0.223 (2) Å ] environment. The two quinolin-8-ol ligands are bent slightly with respect to each other, making a dihedral angle of 9.55 (9) . The DNS anion interacts with the silver complex through O-HÁ Á ÁO hydrogen bonds
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: DN2508). supporting information Acta Cryst. (2009). E65, m1521 [doi:10.1107 Bis(quinolin-8-ol)silver(I) 2-hydroxy-3,5-dinitrobenzoate Chun-Lan Zhang and Fang-Fang Jian S1. Comment ] is well known as a particularly versatile ligand for use in metal complex chemistry (G. Smith, et al.,2001). It is also known that most of Ag I in biological systems is not in the form of free Ag I ions, but is coordinated by the abundance of biological ligands (Wu, et al.,2006). As part of our search for new biologically active compounds the title compound has been synthesized and we report its crystal structure here.

Scheme I
The Ag I atom is coordinated by two N atoms and two O atoms from two quinolin-8-ols in a roughly planar environment with the largest deviation from the mean plane of the non H atoms being 0.223 (2)Å at C14 (Fig. 1). However, the two quinolin-8-ols are slightly bent with respect to each other making a dihedral angle of 9.55 (9)°. In the DNS anion, the NO 2 and CO 2 groups are twisted with respect to the phenyl ring making dihedral angles of of 29.5 (1)° for C21, N4, O6, O7, 10.7 (2)° for C19, N3, O4, 05 and 10.0 (2)° for C23, C25, O8, O9. All of the bond lengths and bond angles are in normal ranges (Smith, et al.,1999;Smith, et al.,2001;Wu, et al., 2006).

S2. Experimental
The title compound(I) was prepared by the process as following: A mixture of 3,5-Dinitrosalicylic acid (0.01 mol), salt of quinolin-8-ol and sulfuric acid (0.02 mol) was stirred in distilled water (30 ml) for 3 h to obtain yellow deposit. A mixture of the deposit and AgNO3(0.01 mol) was stirred in ethanol (20 ml) at 353 K for 5 h, then afford the title compound (yield 83%). Single crystals suitable for X-ray measurements were obtailed by recrystallization from ethanol at room temperature.  The molecular structure of the title compound with the atom-labeling scheme. Displacement ellipsoids are drawn at the 30% probability level. H atoms are represented as small spheres of arbitrary radii. Hydrogen bonds are shown as dashed lines.

Crystal data
[Ag(C 9 H 7 NO) 2 ](C 7 H 3 N 2 O 7 ) M r = 625.30 Monoclinic, P2 1 Hall symbol: P 2yb a = 9.0154 (18) (18) 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 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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 )
x y z U iso */U eq