5,13-Disulfamoyl-1,9-diazatetracyclo[7.7.1.02,7.010,15]heptadeca-2(7),3,5,10,12,14-hexaen-1-ium chloride

In the title salt, C15H17N4O4S2 +·Cl−, the chloride anion is disordered over two positions with occupancies of 0.776 (6) and 0.224 (6). The cation adopts an L shape and the dihedral angle between the benzene rings is 82.5 (3)°. In the crystal, inversion dimers of cations linked by pairs of N—H⋯N hydrogen bonds occur, with the bond arising from the protonated N atom. The cationic dimers are linked into chains via the disordered chloride ions by way of N—H⋯Cl hydrogen bonds and N—H⋯O, C—H⋯O and C—H⋯Cl interactions also occur, which help to consolidate the three-dimensional network.

In the title salt, C 15 H 17 N 4 O 4 S 2 + ÁCl À , the chloride anion is disordered over two positions with occupancies of 0.776 (6) and 0.224 (6). The cation adopts an L shape and the dihedral angle between the benzene rings is 82.5 (3) . In the crystal, inversion dimers of cations linked by pairs of N-HÁ Á ÁN hydrogen bonds occur, with the bond arising from the protonated N atom. The cationic dimers are linked into chains via the disordered chloride ions by way of N-HÁ Á ÁCl hydrogen bonds and N-HÁ Á ÁO, C-HÁ Á ÁO and C-HÁ Á ÁCl interactions also occur, which help to consolidate the threedimensional network.

Comment
Organic salts based on hydrogen bonding are a research field receiving great attention in recent years. As an extension of our study concentrating on hydrogen bonded assembly of organic acid and organic base (Jin et al., 2010), herein we report the crystal structure of 2,9-Dibenzenesulfonamide-1,5-diazaium-bicyclo[3.3.1]dimethanodibenzo chloride.
The compound is a salt. The asymmetric unit of the compound consists of one monocation, and one chloride anion ( Fig.   1), respectively.
The chloride anion is disordered over two positions with occupancies of 0.78, and 0.22 respectively. In the compound there is a mirror plane running through the C15 atom. Two cations formed dimers via the N-H···N hydrogen bond between the NH + cation and the amino group with N-N separation of 2.922 (6) A%. The cation dimers were connected together via the chloride anion through CH-Cl, Cl-O, and N-H···Cl contacts to form one-dimensional chain (A) running along the b axis direction (Fig. 2). Such adjacent chains were combined together by the CH 2 -O, and CH-O interactions to form two-dimensional sheet extending along the bc plane. Such kind of sheets were stacked along the a axis direction via the CH2-Cl interactions to form three-dimensional network structure. It is worthy to note that there are one-dimensional chains (B) that are running through the three-dimensional network. And such kind of chains were connected with the threedimensional network through the N-H···S, and N-H···O interactions.

Experimental
A solution of 2,9-dibenzenesulfonamide-1,5-diazabicyclo[3.3.1]dimethanodibenzo (38 mg, 0.1 mmol) was dissolved in 5 ml of methanol and 1 ml of conc. HCl under continuous stirring. The solution was stirred for about 1 h at room temperature, then the solution was filtered into a test tube. The solution was left standing at room temperature for several days, colorless block crystals were isolated after slow evaporation of the solution in air at ambient temperature. The crystals were collected and dried in air to give the title compound.

Refinement
Hydrogen atoms attached to the C atoms were placed in calculated positions with d(C-H) = 0.93-0.97 Å. Positions of the hydrogen atoms at the NH groups were located from the Fourier difference syntheses and refined independently. All U iso values were restrained on U eq values of the parent atoms.