Electronic circular dichroism spectra from the complex polarization propagator

Area of Science:

• Computational Chemistry
• Spectroscopy
• Quantum Mechanics

Background:

• Electronic Circular Dichroism (ECD) spectroscopy is crucial for determining molecular chirality.
• Accurate calculation of ECD spectra is computationally intensive and challenging.
• Existing methods often struggle to capture the full range of electronic transitions.

Purpose of the Study:

• To develop and apply an efficient computational method for calculating ECD spectra.
• To validate the complex linear polarization propagator approach for diverse molecules.
• To enable ECD spectrum determination across visible, UV, and X-ray regions.

Main Methods:

• Application of the complex linear polarization propagator approach.
• Utilizing time-dependent Kohn-Sham density functional theory (TD-KS-DFT).
• Calculation of ECD spectra for a range of chiral molecules, including a fullerene.

Main Results:

• Demonstrated a direct and efficient evaluation of ECD spectra.
• Successfully calculated ECD spectra for 3R-chloro-1-butyne, 3R-methylcyclopentanone, 3S-methylcyclohexanone, 4R-1,1-dimethyl-[3]-(1,2)ferrocenophan-2-on, S-3,3,3',3'-tetramethyl-1,1'-spirobi[3H,2,1]-benzoxaselenole, and C84.
• The method covers visible, UV, and X-ray spectral ranges.

Conclusions:

• The complex linear polarization propagator approach provides an efficient and accurate method for ECD spectral calculations.
• This method accounts for the entire manifold of excited states, improving upon traditional techniques.
• The approach is versatile and applicable to a wide array of molecules and spectral regions.