Abstract
Three di-Schiff bases of 2-hydroxy-5-methyl-isophthalaldehyde with 4-R-anilines (RH, CH 3, OCH 3) and their 1:1 complexes with HClO 4 were studied by FT-IR, 1H, and 13C NMR spectroscopy in acetonitrile and [ 2H 3]acetonitrile solutions, respectively. In di-Schiff bases intramolecular OH…N hydrogen bonds have been detected; however, they show no proton polarizability. Hydrogen-bonded systems with fast proton fluctuation and large proton polarizability have been found in the 1:1 complexes of di-Schiff bases with HClO 4.
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