Large solvation effect in the optical rotatory dispersion of norbornenone - PubMed (original) (raw)

. 2014 Jan 27;53(5):1386-9.

doi: 10.1002/anie.201306339. Epub 2013 Dec 16.

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Large solvation effect in the optical rotatory dispersion of norbornenone

Priyanka Lahiri et al. Angew Chem Int Ed Engl. 2014.

Abstract

The anomalously large chiroptical response of (1R,4R)-norbornenone has been probed under complementary vapor-phase and solution-phase conditions to assess the putative roles of environmental perturbations. Measurements of the specific rotation for isolated (gas-phase) molecules could not be reproduced quantitatively by comprehensive quantum-chemical calculations based on density-functional or coupled-cluster levels of linear-response theory, which suggests that higher-order treatments may be needed to accurately predict such intrinsic behavior. A substantial, yet unexpected, dependence of the dispersive optical activity on the nature (phase) of the surrounding medium has been uncovered, with the venerable Lorentz local-field correction reproducing solvent-mediated trends in rotatory dispersion surprisingly well, whereas more modern polarizable continuum models for implicit solvation performed less satisfactorily.

Keywords: ab initio calculations; chirality; chiroptical spectroscopy; optical activity; solvent effects.

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