Measurement of the IR-ORD of Induced Cholesteric Solutions in Presence of Linear Dichroism

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The sign of absorption-induced Cotton effects in the IR-ORD spectra of induced cholesteric solutions allows us to distinguish between enantiometric solutes. It is shown here that the often distorted shape of these rotatory anomalies, sometimes making the evaluation ambiguous (in particular for highly diluted solutions), is due to the superimposition of a linear dichroism band and that this can be compensated for by appropriate orientation of the sample. In this way the necessary quantity of optically active solute can be lowered considerably.

Keywords: Chiral discrimination; Induced cholesteric solutions; Infrared rotatory dispersion; Linear dichroism

Document Type: Research Article


Affiliations: 1: Institute of Organic Chemistry, Bulgarian Academy of Sciences, BG-1113 Sofia, Bulgaria 2: Institut für Spektrochemie und angewandte Spektroskopie, D-4600 Dortmund 1, F.R.G. 3: Institut für Physikalische und Theoretische Chemie, Universität Essen-GHS, D-4300 Essen 1, F.R.G.

Publication date: January 1, 1984

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