Vibrational circular dichroism of 2,6-di-sec-butyl-4-methylpyridine and 2,6-di-sec-butyl-4-methylpyridine-N-oxide: theoretical evidence on the existence of multiple –CH, –CH2, and –CH3⋯O intramolecular hydrogen bonds on the nitroxide oxygen

2014 ◽  
Vol 25 (9) ◽  
pp. 725-735 ◽  
Author(s):  
Florina Teodorescu ◽  
Jean-Valère Naubron ◽  
Cornelia Uncuţa ◽  
Petru Ivan Filip ◽  
Emeric Bartha ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Hydrogen Bonds ◽  
Vibrational Circular Dichroism ◽  
Intramolecular Hydrogen Bonds ◽  
Theoretical Evidence ◽  
Intramolecular Hydrogen ◽  
Circular Dichroïsm

Vibrational Circular Dichroism of Proline-Containing Oligopeptides

1996 ◽  
Vol 50 (5) ◽  
pp. 644-648 ◽  
Author(s):  
Mitsuhiro Miyazawa ◽  
Katsuhiko Inouye ◽  
Tadao Hayakawa ◽  
Yoshimasa Kyogoku ◽  
Hiromu Sugeta
Keyword(s):  
Hydrogen Bond ◽  
Circular Dichroism ◽  
Vibrational Circular Dichroism ◽  
Type Ii ◽  
Dilute Solutions ◽  
Infrared Absorption Spectra ◽  
High Concentrations ◽  
Intramolecular Hydrogen ◽  
Circular Dichroïsm ◽  
Hydrogen Bonded

Vibrational circular dichroism (VCD) and infrared absorption spectra in the amide A region of blocked oligopeptides containing proline have been obtained in apolar organic solvents in order to clarify the characteristic VCD for the intramolecularly hydrogen-bonded NH stretching involved in the turn structures of peptide chains as well as the intermolecularly hydrogen-bonded NH stretching in associated molecules. The γ-turn with the intramolecularly hydrogen-bonded C7 conformation exhibits a characteristic positive VCD band at about 3330 cm−1 in dilute solutions of Piv-Pro-NHMe and Ac-Pro-NHMe. The intramolecularly hydrogen-bonded NH stretching in the type II β-turn with C10 conformation gives rise to a positive VCD band at 3345 cm−1 for Piv-Pro-Gly-NHMe. The Gly NH group of Piv-Pro-Gly-OMe and Ac-Pro-Gly-OMe in dilute solutions assumes C7C5 conformation stabilized by a bifurcated three-center intramolecular hydrogen bond and exhibits a positive VCD band near 3300 cm−1 at a lower frequency than the intermolecularly hydrogen-bonded band. All the peptides studied give a characteristic negative—positive bisignate couplet from the high wavenumber side for the intermolecularly hydrogen-bonded NH stretching band at high concentrations.

Controlling emissive properties by intramolecular hydrogen bonds: alkyl and aryl meso‐substituted porphycenes

2021 ◽  
Author(s):  
Jacek Waluk ◽  
Arkadiusz Listkowski ◽  
Natalia Masiera ◽  
Michał Kijak ◽  
Roman Luboradzki ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Intramolecular Hydrogen Bonds ◽  
Intramolecular Hydrogen

Energies of intramolecular hydrogen bonds in some alcohols

1974 ◽  
Vol 20 (3) ◽  
pp. 414-415
Author(s):  
Ya. A. Shuster ◽  
V. A. Granzhan ◽  
P. M. Zaitsev
Keyword(s):  
Hydrogen Bonds ◽  
Intramolecular Hydrogen Bonds ◽  
Intramolecular Hydrogen
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