title: S-5-Amino-2-(dimethyl-ammonio)phenyl sulfothio-ate.
abstract: The title compound, C(8)H(12)N(2)O(3)S(2), has been isolated as a by-product in the synthesis of methyl-ene blue dye. The compound crystallizes with four independent mol-ecules in the unit cell (Z'= 4). The zwitterionic form of the mol-ecule was established on the basis of the hydrogen atom located at the dimethyl-amino group. The crystal structure is dominated by inter-molecular hydrogen bonds of the N-H⋯O type formed between amino and ammonio N-H groups and O atoms from the sulfothio-ate group. There are in addition two weak inter-molecular N-H⋯N inter-actions and some non-conventional C-H⋯O hydrogen bonds.
authors.affiliation: Faculty of Textile Technology, Laboratory of Applied Chemistry, University of Zagreb, Prilaz baruna Filipovića 28a, HR-10000 Zagreb, Croatia.
authors.forename: Gordana
authors.initials: G
authors.lastname: Pavlović
authors.forename: Livio
authors.initials: L
authors.lastname: Racané
authors.forename: Vesna
authors.initials: V
authors.lastname: Tralić-Kulenović