Time-dependent density functional calculations of optical rotatory dispersion including resonance wavelengths as a potentially useful tool for determining absolute configurations of chiral molecules

Jochen Autschbach, Lasse Jensen, George C Schatz, Y. C Electra Tse, Mykhaylo Krykunov

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

The optical rotations for six organic molecules (verbenone, fenchone, camphor, nopinone, Tröger's base, dimethyl-cyclopropane) and the transition metal complex [Co(en) 3] 3+ were calculated as a function of wavelength using time-dependent density functional theory (TDDFT). In the calculations, a realistic behavior of the optical rotation in the vicinity of an electronic transition was obtained by using a phenomenological damping parameter of the order of 0.2 eV (0.007 au). In comparison with experiment, for the molecules studied here the sign and order of magnitude of the optical rotation as well as the excitation energies were reasonably well reproduced in most computations. These findings apply to the investigated wavelength ranges typically between about 200 and 650 nm even when using comparatively small basis sets. Such calculations might therefore routinely be applied to help assigning the absolute configurations of chiral molecules. Supplementary calculations of the circular dichroism (CD) and comparison with experimental CD were used for further assessment of the optical rotation calculations. In particular, a combined study of optical rotation and CD turned out to be useful in cases where the optical rotatory dispersion in a specific energy range exhibits a considerable blue or red shift or where it is difficult to reproduce because of an interplay of several competing Cotton effects. The influence of basis set, density functional, and the damping parameter was also investigated.

Original languageEnglish
Pages (from-to)2461-2473
Number of pages13
JournalJournal of Physical Chemistry A
Volume110
Issue number7
DOIs
Publication statusPublished - Feb 23 2006

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Optical rotation
Density functional theory
Wavelength
Molecules
dichroism
configurations
wavelengths
molecules
Damping
damping
Camphor
camphor
cyclopropane
Excitation energy
cotton
Coordination Complexes
blue shift
red shift
Cotton
Transition metals

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Time-dependent density functional calculations of optical rotatory dispersion including resonance wavelengths as a potentially useful tool for determining absolute configurations of chiral molecules. / Autschbach, Jochen; Jensen, Lasse; Schatz, George C; Tse, Y. C Electra; Krykunov, Mykhaylo.

In: Journal of Physical Chemistry A, Vol. 110, No. 7, 23.02.2006, p. 2461-2473.

Research output: Contribution to journalArticle

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