Induced circular dichroism of chiral amine–benzoylbenzoic acid systems

Abstract

Induced circular dichroism for the ion-pair systems of benzoylbenzoic acid–chiral amine displays two typical shapes associated with the origins of the carbonyl n–π* transition, i.e., the electronically allowed and vibronically allowed transitions. In the former case the i.c.d. spectra display Gaussian shapes with the sign dependent on the helical structure of the acid. In the latter case the spectra display definite vibrational structure.