Abstract
The effects of fluorine substitution in benzene rings and quaternization of the nitrogen atom in Schiff bases of the general formula R−CH=N−R′ on the vibration characteristics of the azomethine group are analyzed. Normal vibrations and intensities of IR bands are calculated. It is shown that the spectroscopic behavior of the C=N bond is almost independent of the electronic effects of substituents in the benzene rings of the molecules studied, and the changes in the intensities of νC=N bands are caused by interactions between vibrations. This points to the stability of this bond in the series of molecules under consideration. For diphenylnitrones, N→O vibrations are identified.
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Additional information
L. M. Litvinenko Institute of Physical Organic Chemistry and Carbon Chemistry. Translated fromZhurnal Strukturnoi Khimii, Vol. 36, No. 2, pp. 310–315, March–April, 1995.
Translated by L. Smolina
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Kozhevina, L.I., Prokopenko, E.B., Rybachenko, V.I. et al. Investigation of azomethine group vibrations in aromatic schiff bases and their N-oxides by vibrational spectroscopy methods. J Struct Chem 36, 276–280 (1995). https://doi.org/10.1007/BF02578067
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DOI: https://doi.org/10.1007/BF02578067