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• W2019235763 endingPage "2473" @default.
• W2019235763 startingPage "2461" @default.
• W2019235763 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." @default.
• W2019235763 created "2016-06-24" @default.
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• W2019235763 date "2006-01-31" @default.
• W2019235763 modified "2023-10-16" @default.
• W2019235763 title "Time-Dependent Density Functional Calculations of Optical Rotatory Dispersion Including Resonance Wavelengths as a Potentially Useful Tool for Determining Absolute Configurations of Chiral Molecules" @default.
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• W2019235763 doi "https://doi.org/10.1021/jp054847z" @default.
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