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Abstract
AbstractInfrared spectra have been obtained for pyridoxal isonicotinoyl hydrazone, pyridoxal benzoyl hydrazone, salicylaldehyde isonicotinoyl hydrazone and salicylaldehyde benzoyl hydrazone. Vibrational assignments are proposed mainly in the 2000‐1200 cm−1 region. Evidence is given that a intramolecular bond exists between the phenolic hydroxyl and the nitrogen of imine group. Trans amide III band located near 1550 cm−1 presents a drastic shift from usual results (more than 50 cm−1). Conformational equilibrium is discussed with AM1 and ab‐initio methods. IR and NMR (NOE measurements) studies show that one conformation seems to be predominant.
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