SPECTRAL MEANS TO ESTIMATE THE ENERGY OF INTERNAL INTERACTIONS IN LIQUID SOLUTIONS

Autor/autori: CEZARINA MOROSANU and DANA ORTANSA DOROHOI

Abstract: Two cycloimmonium ylids with common carbanion were used as spectrally active molecules for measuring the amplitude of the internal electric field in liquid solutions. The wavenumbers in the maximum of the ylid visible absorption band with electronic charge transfer from the carbanion through the heterocycle can be considered as indicator of the strength of the internal interactions in solutions. This band is very sensitive to the solvent action. The wavenumbers in the maximum of the visible band depend on the solvent electric permittivity and also on the solvent chemical nature. The supplementary spectral shifts measured in protic solvents prove the existence of specific interactions between these solvents and the ylid molecules. A solvatochromic study allows us to separate the supply of the specific interactions from the total spectral shift recorded in a given solvent.

Keywords: electronic absorption spectra, cycloimmonium ylids, universal interactions, specific interactions.

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