SYNTHESIS AND SPECTRAL STUDIES OF 3-AZACYCLOTHIOSEMICARBAZONES

Abstract

3-Azacyclothiosemicarbazones of benzaldehyde and 4-methoxy benzaldehyde have been prepared and physicochemically characterized. IR, NMR and electronic spectra of the ligand have been obtained. IR spectra suggest thiocarbonyl group stretching and bending vibrations at ~ 1320 and 840 cm-1, while additional bands in the broad region of 1500−700 cm-1 are due to vibrations involving interactions between C=S stretching and C−N stretching of the C=S group attached to a nitrogen atom. 1HNMR spectra of the ligands show signals corresponds to 7CH= proton. Absence of any coupling interactions by 2NH due to the unavailability of protons on neighboring atoms render singlet peak for the imine proton. On the basis of spectral and analytical studies, the ligands behave as monobasic bidentate NS donors. The complexes were given the formulae HL1 (1) and HL2 (2).