4-Formyl- and I-acetylpyridine N(4)-methyl- and N(4)-ethylthiosemicarbazone
have been prepared, their structures solved and IR, NMR and UV spectra rec
orded. Intramolecular and intermolecular hydrogen bonding are both present,
but the mode of the intermolecular interaction differs in the four compoun
ds. Further, there is a significant difference in their angles between the
mean planes of the pyridine ring and thiosemicarbazone moiety. The H-1 NMR
spectral studies show significant differences between the compounds as do U
V and IR spectra. (C) 2001 Elsevier Science B.V. All rights reserved.