1H and13C NMR spectra of para-substituted o-HOC6H4CH˭NC6H4X and YC6H4CH˭NC6H4OH-o were determined in CDC13. Reasonable correlations between the azomethine proton and13C chemical shifts and Hammett's σPconstants were obtained. The observed through-resonance effect was attributed to intramolecular hydrogen bonding between the hydrogen at the phenolic group and the imine nitrogen in the molecule.