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C24H26N4O6S2, monoclinic, C12/c1 (no. 15), a = 13.429(1) Å, b = 9.7934(9) Å, c = 20.331(2) Å, * = 105.808(2)°, V = 2572.7 Å, Z = 4, Rgt(F) = 0.039, wRref(F ) = 0.098, T = 296 K. Source of material All reagents were commercially available and of analytical grade. The 5 ml ethanol soloution of 2-aminopyridine (1.0 mmol, 0.094 g) was slowly added to an aqueous solution (25 ml) of 2,2'dithiodibenzoic acid (1.0 mmol, 0.301 g). The mixture was stirred for 10 minutes at 100 °C. The solution was filtered, and the filtrate was kept at the room temperature. After 6 d, crystals suitable for single crystal X-ray diffraction were obtained. Experimental details Hydrogen atoms bonded to N and O were located in difference Fourier maps and refined isotropically with distance restraints d(N—H) = 0.89(2), d(O—H) = 0.82(2) and d(H—H) = 1.34(2) Å, respectively. All the remaining H atoms were positioned geometrically and treated as riding with d(C—H) = 0.93 Å and Uiso(H) = 1.2 Ueq(C). Discussion Rational design and assembly of novel supramolecular aducts through hydrogen bonding interaction are still an important research area due to their striking structures [1,2]. This work continues our previously investigations of supra-molecular interactions between aromatic molecular salts and adducts [3]. The asymmetric unit of the title crystal structure consists of two 2aminopyridinium cations, one 2,2'-dithiobis(benzoate) anion and two discrete water molecules. 2,2'-Dithiobis(benzoate) anion has an inversion centre at the midpoint of the S1—S1 (–x,y,–z+1⁄2) bond. Two benzene rings of 2,2'-dithiobis(benzoate) anion are nearly perpendicular to each other with the dihedral angles of 103.4° and C6–S1–S1A angle of 105°. 3-Aminopyridinium cation and 2,2'-dithiobis(benzoate) anion are linked together through a pair of N–H···O hydrogen bonds forming a R2(6) motif, in which 3-aminopyridinium cation uses another N–H donor contacting to one water molecule via N–H···O hydrogen bonds. In addition, each R2(6) motif interacts with neighbor two water molecule through O···H–O hydrogen bonds. In contrast, each water molecule links adjacent three R2(6) motifs leading to an infinite three-dimensional hydrogen-bonded framework. Z. Kristallogr. NCS 225 (2010) 367-368 / DOI 10.1524/ncrs.2010.0161 367 © by Oldenbourg Wissenschaftsverlag, München Crystal: colorless block, size 0.13 × 0.18 × 0.20 mm Wavelength: Mo K+ radiation (0.71073 Å) .: 2.53 cm−1 Diffractometer, scan mode: Bruker SMART Apex CCD, ' 2,max: 52° N(hkl)measured, N(hkl)unique: 6999, 2520 Criterion for Iobs, N(hkl)gt: Iobs > 2 )(Iobs), 1851 N(param)refined: 183 Programs: SHELXS-97, SHELXL-97, SHELXTL [4] Table 1. Data collection and handling.

Crystal structure of bis(2-aminopyridinium) 2,2′-dithiobis(benzoate) dihydrate, [C 5 H 7 N 2 ] 2 [C 14 H 8 O 4 S 2 ] · 2H 2 O