2-Hydroxy-4-methoxybenzaldehyde thiosemicarbazone

The title Schiff base compound, C(9)H(11)N(3)O(2)S, was prepared by the reaction of equimolar quantities of 2-hydroxy-4-methoxybenzaldehyde with thiosemicarbazide in methanol. The molecule adopts a trans configuration with respect to the azomethine group and an intramolecular O-H center dot center dot center dot N hydrogen bond generates an S(6) ring. In the crystal structure, molecules are linked through intermolecular N-H center dot center dot center dot O and N-H center dot center dot center dot S hydrogen bonds, forming a three-dimensional network.