A quasi-diamondoid hydrogen-bonded framework in anhydrous sulfanilic acid

Abstract

The title compound (C(6)H(7)NO(3)S) exists as a zwitterion (4-ammoniobenzenesulfonate), +H(3)NC(6)H(4)SO(3)-, and these units are linked into a three-dimensional framework by two distinct two-centre N-H* * *O hydrogen bonds [H* * *O 1.84 and 1.87 A; N* * *O 2.767 (2) and 2.746 (2) A; N-H* * *O 166 and 172 degrees ] and a planar three-centre N-H* * *(O)(2) hydrogen bond [H* * *O 2.03 and 2.37 A; N* * *O 2.816 (2) and 2.877 (2) A; N-H* * *O 162 and 111 degrees; O* * *H* * *O 86 degrees ].

Surprises in a ‘Simple' System: 2,4‐Diaminobenzenesulfonic Acid

“…These data and the location of the NH 3 Hatoms from the difference maps (all with full occupancy) support the zwitterionic nature of the material. This is in good agreement with the structures of 2-amino- [17], and 4-aminobenzenesulfonic acid (AFAZEM) [14] and its monohydrate (SANACM) [12]. The ORTEP diagram of the asymmetric unit of DBSA ( Fig.…”

“…A comparison of the SÀO bond lengths in the various forms of DBSA reveals no major differences, indicating that there is no evidence of distinct single and double bonds [14]. Also an examination of the CÀN bond lengths reveals the expected bond lengths for NH 3 and NH 2 groups [15].…”

Electron Paramagnetic Resonance Study of the Paramagnetic Center in Gamma-Irradiated Sulfanilic Acid Single Crystal

“…The radiation damage center formed in gammairradiated sulfanilic acid single crystal was studied by EPR method at 120 K. It was observed that the EPR parameters of the radical formed in the sulfanilic acid single crystal exhibited anisotropic property. The hyperfine splittings are determined by the interaction of the N(5) nitrogen nucleus with the unpaired electron, the interaction of the two magnetically equivalent H (16) and H (17) hydrogen nuclei with the unpaired electron, the interaction of the two magnetically equivalent H (12) and H(13) nuclei with the unpaired electron, and the interaction of the two magnetically equivalent H (14) and H (15) nuclei with the unpaired electron. The NH 2 fragment in the structure shows its effect in the spectra.…”

“…Owing to the nitrogen atom, the spectra exhibit a triplet (1:1:1). Then, due to the two magnetically equivalent H (16) and H (17) hydrogen nuclei, the spectra exhibit a triplet (1:2:1). Due to the two magnetically equivalent H (12) and H(13) nuclei, the spectra exhibit a triplet (1:2:1).…”

Crystal structure of tetramethylammonium sulfanilate, C10H18N2O3S

“…the proton derived from the sulfonate to form the neutral compound [1]. It also can be found the acid can lose its proton of the sulfonate to become the related anion to interact with di erent organic cations such as ammonium [2], methylammonium [3], hydroxylammonium [4], guanidinium [5] and triethylammonium [6].…”