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In the title hydrated mol-ecular salt, C 13 H 14 N 3 S + ·HSO 4  - ·H 2 O, the protonation of the azomethine N atom in sulfuric acid medium involves the formation of the bis-ulfate anion. The mol-ecular structure of the cation is obtained from the thiol tautomer of thio-semicarbazone wherein the naphthalene moiety and the conjugation of the bonds contribute to the planarity of the mol-ecular skeleton. In the crystal, the cation, anion and water mol-ecule of crystallization are linked by a series of O-H⋯O and N-H⋯O hydrogen bonds, forming a three-dimensional network. Within this network, there are also C-H⋯π inter-actions present involving symmetry-related naphthalene rings.

acta crystallographica. section e, crystallographic communications

Synthesis and crystal structure of ((<i>E</i>)-{2-[(<i>E</i>)-(4-hydroxynaphthalen-1-yl)methylidene]hydrazin-1-yl}(methylsulfanyl)methylidene)azanium hydrogen sulfate monohydrate

Synthesis and crystal structure of ((E)-{2-[(E)-(4-hydroxynaphthalen-1-yl)methylidene]hydrazin-1-yl}(methylsulfanyl)methylidene)azanium hydrogen sulfate monohydrate