The crystal structure of phthalyl sulfacetamide

N-Acetyl-4-[(2-hydroxybenzylidene)amino]benzenesulfonamide monohydrate andN-acetyl-4-[(5-bromo-2-hydroxybenzylidene)amino]benzenesulfonamide monohydrate

“…values. The S1ÐC11 distance of 1.760 (3) A Ê in (I) and (II) is a normal single-bond value and matches well with those observed in other sulfonamides (Singh et al, 1984;Abramenko & Sergienko, 2002). The SÐN bond distances in (I) and (II) have a considerable amount of double-bond character.…”

“…These molecules are linked by O1WÐH1WÁ Á ÁO4, O1WÐ H2WÁ Á ÁO4 and O1WÐH2WÁ Á ÁO2 hydrogen bonds (Tables 2 and 4), which leads to the close approach of atoms O2 and C14 due to rotation of the sulfonamide and acetyl moieties about the S1ÐN2 and N2ÐC14 bonds. In the related structures of 2-[4-(acetylaminosulfonyl)phenylcarbamoyl]benzoic acid (phthalylsulfacetamide), (III) (Singh et al, 1984), and p-aminobenzenesulfonacetamide, (IV) (Basak & Mazumdar, 1982), where the water molecule is absent in the crystal packing, the O2ÐS1ÐN2ÐC14 and S1ÐN2ÐC14ÐO4 torsion angles are À53.2 and À61.5 , and 6.8 and 7.2 , respectively, whereas in (I) and (II), these angles are À46.0 (3) and À45.8 (2) , and 4.3 (4) and 3.8 (4) , respectively. In (III) and (IV), the abovementioned intermolecular contacts between the carbonyl C and sulfonyl O atoms are 4.69 and 4.39 A Ê , respectively.…”

The Crystal Structure of Entrapped 8-Hydroxyquinoline Molecules in an Interleaved Hydrogen Bonded <i>Zigzag</i> Channel of Sulfamethoxazole Molecules

“…7 The S1-C27 distance of 1.737(14)Å matches wellwiththoseinothersulfonamides. 8 The packing structure of SMZ (Fig. 3a) is similar to the interleavedherringbonemotifdescribedinpolymorphIIIofthe parent SMZ structure.…”