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Updated: Mar 17, 2026

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
Published on: January 16, 2016
Towards an Observation of Active Conformations in Asymmetric Catalysis: Interaction-Induced Conformational
Nora M Kreienborg1, Corina H Pollok1, Christian Merten2
1Organische Chemie 2, Ruhr-Universität Bochum, Universitätsstraße 150, 44801, Bochum, Germany.
Abstract:
The observation of the active species is the goal of most spectroscopic investigations on enantioselective organocatalysts in solution. Although NMR spectroscopy is widely applied, it has low sensitivity for conformational changes or the chiral nature of the interactions. In the present work, we exemplify the use of vibrational circular dichroism (VCD) spectroscopy for the characterization of a chiral thiourea model compound in nonpolar and polar solvents, as well as for a detailed analysis of its interaction with a model reactant. We discuss solvent-induced conformational changes of the thiourea, and provide evidence for an unexpected binding topology between the thiourea and an acetate anion. The results clearly showcase the possibilities offered by using VCD spectroscopy in the characterization of chiral organocatalysts.
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