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Structural investigation of aroylhydrazones in dimethylsulphoxide/water mixtures

Molecular structures of aroylhydrazones derived from salycilaldehyde, o-vanilin and nicotinic acid hydrazide in DMSO and DMSO/H2O mixtures have been studied by NMR, UV-Vis, ATR and Raman spectroscopy. The addition of water to the system did not induce tautomeric conversion of the existing form constituted of the ketoamino hydrazide part and the enolimino aldehyde part, but it was involved in formation of hydrated molecules. Vibrational spectra (ATR and Raman) clearly indicated hydrogen bonding of the studied hydrazones through the carbonyl, amino and hydroxyl groups with water molecules. Increasing the water content conversion from E to Z isomer was not observed.

aroylhydrazones; FT IR; ATR; Raman; NMR; UV-Vis

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