3-Hydr­oxy-4-methoxy­benzaldehyde thio­semicarbazone hemihydrate

Abstract

The asymmetric unit of the title compound, C9H11N3O2S·0.5H2O, comprises two crystallograpically independent thio­semicarbazone mol­ecules (A and B) and a water mol­ecule of crystallization. In each of the thio­semicarbazone mol­ecules, intra­molecular O—H⋯O and N—H⋯N hydrogen bonds form five-membered rings, producing S(5) ring motifs. Inter­molecular O—H⋯S and N—H⋯O inter­actions between mol­ecule B and the water mol­ecule form a six-membered ring, producing an R 2 2(6) ring motif. Inter­molecular N—H⋯S hydrogen bonds form dimers involving pairs of both A and B mol­ecules, which form R 2 2(8) ring motifs. The angles between the aromatic ring and thio­urea unit in the two mol­ecules are 0.80 (6) and 3.28 (5)°, which proves that each mol­ecule is fairly planar. The crystal structure is stabilized by inter­molecular O—H⋯S (×2), O—H⋯O, N—H⋯S (×2) and N—H⋯O (×2) hydrogen bonds and C—H⋯O (×2) contacts to form a three-dimensional network