Crystal Structures of Schiff Base Derivatives of 1-(3,4,5-Trimethoxybenzylidene)thiosemicarbazide and (E)-N'-(3-nitrobenzylidene)isonicotinohydrazide.

The crystal structures of 1-(3,4,5-trimethoxybenzylidene)thiosemicarbazide (1) and N'-(3-nitrobenzylidene) isonicotinohydrazide (2) have been determined by single-crystal X-ray diffraction. In compound 1, the position of C8, O1, O2, O3 atoms are in a distorted trigonal planar geometry. The mean plane of 3,4,5-trimethoxybenzylidene ring forms a dihedral angle of 5.39(14)° with the mean plane of thiosemicarbazide group. In the structure, the molecular packing is stabilized by intermolecular N-H··N, O-H··S and intramolecular C-H··O hydrogen bonds. In compound 2, the position of C8 atom and N1 atom are in a distorted trigonal planar geometry. The mean plane of phenyl ring forms a dihedral angle of 8.09° with that of the pyridine ring. In the structure, the molecular packing is stabilized by intermolecular N-H··N and intramolecular C-H··O hydrogen bonds. [ABSTRACT FROM AUTHOR]