title: S-2-Amino-5-(dimethyl-ammonio)phenyl sulfothio-ate.
abstract: The title compound, C(8)H(12)N(2)O(3)S(2), has been isolated as an inter-mediate in the synthesis of methyl-ene blue dye, the best known phenothia-zine dye, and structurally characterized as a zwitterion. The crystal structure is dominated by inter-molecular N-H⋯O hydrogen bonds between the amine and sulfothio-ate groups, with graph-set motif C(9)R(2) (2)(8), involving anti-parallel chains and a centrosymmetric eight-membered ring. A hydrogen bond with graph-set motif R(2) (2)(14) between the ammonium and sulfothio-ate groups completes the two-dimensional network in the ab plane. Inter-molecular C-H⋯O hydrogen bonds are also present in the crystal.
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