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Glycine conformational preferences have mostly been explained as due to the formation of intramolecular hydrogen bonding, despite other possible relevant intramolecular interactions that may be present in this molecular system. This paper, within the framework of the quantum theory of atoms in molecules and natural bond orbital analysis, at the B3LYP/aug-cc-pVDZ level, shows that hydrogen bonding...
We report conformational analysis of an end-protected tripeptide, BOC–Phe–Aib–Leu–OMe in CCl 4 solution and solid crystal at room temperature by infrared spectroscopy and quantum chemistry calculation. The measured spectra in those physical conditions appear different, which has been attributed to different secondary structures of the peptide in the two phases. Our analysis reveals that the...
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