Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 117, Issue 17, Pages 5136-5147Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp400562n
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Funding
- Wroclaw Centre for Networking and Supercomputing
- European Union - the European Regional Development Fund within the Operational Programme Innovative economy
- COST-CMTS Action [CM 1002]
- Polish National Science [2012/05/B/ST4/01236]
- Research Council of Norway [210973/F11]
- Norwegian Research Council through a Center of Excellence [179568/V30]
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The performance of implicit and explicit solvent models (polarizable continuum model (PCM) and microsolvation with positions of water molecules obtained either from molecular dynamics (MD) simulations or quantum mechanical geometry optimization) for calculations of electronic circular dichroism (CD) and optical rotation (OR) is examined for two polar and flexible molecules: lactamide and 2-aminopropanol. The vibrational structure of the CD spectrum is modeled for lactamide. The results are compared with the newly obtained experimental data. The signs of the bands are correctly reproduced using all three methods under investigation and the CAM-B3LYP functional for the CD spectrum of lactamide, but not for aminopropanol. The sign of the calculated optical rotation is correctly predicted by means of PCM, but its magnitude is somewhat underestimated in comparison with experiment for lactamide and overestimated for 2-aminopropanol. To some extent it is rectified by employing explicit hydration. Overall, microsolvation with geometry optimization seems more cost-effective than classical MD, but this is likely to be a consequence of inadequate classical potential and electronic structure model.
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