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This packing motif with the sulfonate and carboxyl­ate groups directed to opposite sides of the layer is contrary to what was found in the silver salt of the isomeric 4-sulfo­benzoic acid (Squattrito et al., 2019 ).

The rings of these anions are significantly out of parallel with an inter­planar angle of ca 139°. The symmetry-independent anions alternate in the b-axis direction within the layer. Anions in adjacent layers are linked by O-H⋯O hydrogen bonds between neighboring carb­oxy­lic acid groups in the classic dimerization of such mol­ecules (Table 2 Fig. 3 ). The packing in (I) features layers of metal ions in the ab plane alternating with double-layers of 3-sulfo­benzoic acid anions stacking along the c-axis direction (Fig. 2 ). The carboxyl­ate group remains protonated with the acidic H atoms unambiguously located on O2 and O7. The extensive metal–sulfonate bonding is as expected given the softer nature of Ag + relative to most d-block transition-metal ions (Parr & Pearson, 1983 ), which generally show little tendency to bond directly to sulfonate groups (Ma et al., 2003 ). The Ag-O distances are consistent with those seen in other silver arene­sulfonates (Côté & Shimizu, 2004 ). This kind of pseudo-tetra­hedral coordination geometry significantly distorted by two somewhat longer Ag-O inter­actions was previously observed in the silver salt of 6-ammonio­naphthalene-1,3-di­sulfonate (Downer et al., 2006 ). Not surprisingly, the Ag-O distances are shorter by an average of 0.02 Å at 100 K than at 293 K. The silver ions are coordinated by six sulfonate O atoms with four shorter ( ca 2.4–2.5 Å) and two longer ( ca 2.7 Å) distances (Table 1 ) in an irregular hexa­coordinate geometry. The major features of the structure at 100 K are consistent with those at 293 K. We find the structure at 100 K to be triclinic ( P ) with two independent cations and anions in the asymmetric unit (Fig. 1 ). The room-temperature (293 K) structure of (I) was previously reported in the monoclinic space group C2/ c with one independent cation and anion in the asymmetric unit (Prochniak et al., 2008 ). The product of the reaction of silver nitrate and sodium 3-sulfo­benzoic acid is Ag(O 3SC 6H 4CO 2H), (I), an anhydrous monobasic silver(I) salt of 3-sulfo­benzoic acid.