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Vibrational Raman optical activity of 1‐phenylethanol and 1‐phenylethylamine: Revisiting old friends
Author(s) -
Kapitán Josef,
Johannessen Christian,
Bouř Petr,
Hecht Lutz,
Barron Laurence D.
Publication year - 2009
Publication title -
chirality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.43
H-Index - 77
eISSN - 1520-636X
pISSN - 0899-0042
DOI - 10.1002/chir.20747
Subject(s) - raman optical activity , chemistry , raman spectroscopy , anharmonicity , ab initio , enantiomer , chirality (physics) , spectral line , computational chemistry , ab initio quantum chemistry methods , molecular physics , molecule , stereochemistry , organic chemistry , optics , physics , quantum mechanics , nambu–jona lasinio model , quark , chiral symmetry breaking
The samples used for the first observations of vibrational Raman optical activity (ROA) in 1972, namely both enantiomers of 1‐phenylethanol and 1‐phenylethylamine, have been revisited using a modern commercial ROA instrument together with state‐of‐the‐art ab initio calculations. The simulated ROA spectra reveal for the first time the vibrational origins of the first reported ROA signals, which comprised similar couplets in the alcohol and amine in the spectral range ∼280–400 cm −1 . The results demonstrate how easy and routine ROA measurements have become, and how current ab initio quantum–chemical calculations are capable of simulating experimental ROA spectra quite closely provided sufficient averaging over accessible conformations is included. Assignment of absolute configuration is, inter alia, completely secure from results of this quality. Anharmonic corrections provided small improvements in the simulated Raman and ROA spectra. The importance of conformational averaging emphasized by this and previous related work provides the underlying theoretical background to ROA studies of dynamic aspects of chiral molecular and biomolecular structure and behavior. Chirality 21:E4–E12, 2009. © 2009 Wiley‐Liss, Inc.