Issue 7, 2019

How to treat C–F stretching vibrations? A vibrational CD study on chiral fluorinated molecules

Abstract

The analysis of vibrational circular dichroism and infrared spectra typically requires the prediction of spectra on the density functional theory level. In particular for absolute configuration determinations, for which the comparison between experiment and theory is often supported by similarity analysis algorithms, it is important that frequencies, relative band intensities and VCD signs are predicted correctly. Due to the poor prediction of harmonic frequencies, carbon–fluorine stretching vibrations are often strongly misplaced by common hybrid functionals such as B3LYP. Herein we show that the M06-2X functional provides harmonic C–F stretching frequencies with an accuracy sufficient for a reliable spectra analysis. We briefly discuss the origin of this exceptional performance and show that it is likely to be related to a cancellation of errors.

Graphical abstract: How to treat C–F stretching vibrations? A vibrational CD study on chiral fluorinated molecules

Supplementary files

Article information

Article type
Paper
Submitted
14 Apr 2018
Accepted
25 Mai 2018
First published
25 Mai 2018

Phys. Chem. Chem. Phys., 2019,21, 3506-3511

How to treat C–F stretching vibrations? A vibrational CD study on chiral fluorinated molecules

N. M. Kreienborg and C. Merten, Phys. Chem. Chem. Phys., 2019, 21, 3506 DOI: 10.1039/C8CP02395F

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