Discrimination of Enantiomers at Microgram Level Using Liquid Crystalline Solutions

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In a nematic liquid crystal a cholesteric, i.e., helical, arrangement of molecules is induced by doping with a low concentration of chiral molecules. This structure is oppositely coiled for enantiomers leading to countercurrent infrared rotatory dispersion curves. It is shown that by employing this effect, enantiomers can be discriminated even if only microgram quantities are available. The measurement of the rotatory dispersion using a normal infrared spectrometer is described, and examples to demonstrate the applicability are given.

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

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370278774330784

Affiliations: Institut für Spektrochemie und angewandte Spektroskopie, D-4600 Dortmund, Federal Republic of Germany

Publication date: November 1, 1978

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