catena-Poly[bis(μ3-2-methylbenzoato)disilver(I)]

The crystal structure of the title compound, [Ag2(C8H7O2)2]n, features polymeric chains extending along the a axis, with the two Ag+ cations in a distorted trigonal coordination. The range of Ag—O bond lengths is 2.169 (2)–2.433 (2) Å, whereas the Ag⋯Ag separations are in the range 2.8674 (4)–3.6256 (5) Å. The 2-methylbenzoate groups are oriented at a dihedral angle of 60.7 (1)° with respect to each other.

The crystal structure of the title compound, [Ag 2 (C 8 H 7 O 2 ) 2 ] n , features polymeric chains extending along the a axis, with the two Ag + cations in a distorted trigonal coordination. The range of Ag-O bond lengths is 2.169 (2)-2.433 (2) Å , whereas the AgÁ Á ÁAg separations are in the range 2.8674 (4)-3.6256 (5) Å . The 2-methylbenzoate groups are oriented at a dihedral angle of 60.7 (1) with respect to each other.

S2. Experimental
Aqueous solutions of silver nitrate (0.17 g, 1.0 mmol) and the sodium salt of o-toluic acid (0.122 g, 1.0 mmol) were prepared separately in 5.0 and 10.0 ml of water, respectively. The aqueous silver nitrate was added dropwise to the solution of the sodium salt of o-toluic acid with continuous stirring until a white precipitate appeared. The reaction mixture was filtered after treatment with liquid ammonia. It was concentrated and kept in the dark for crystallization.
White needle-like crystals appeared within two months.

S3. Refinement
The H-atoms were positioned geometrically (C-H = 0.93-0.96 Å) and refined as riding with U iso (H) = xU eq (C), where x = 1.5 for methyl and x = 1.2 for aryl H-atoms.     A partial packing diagram (PLATON; Spek, 2009) which shows that the polymeric chains are linked into pairs.

catena-Poly[bis(µ 3 -2-methylbenzoato)disilver(I)]
Crystal data Special details Geometry. Bond distances, angles etc. have been calculated using the rounded fractional coordinates. All su's are estimated from the variances of the (full) variance-covariance matrix. The cell e.s.d.'s are taken into account in the estimation of distances, angles and torsion angles 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.