scholarly journals Hydrogen-Bond Detection, Configuration Assignment and Rotamer Correction of Side-Chain Amides in Large Proteins by NMR Spectroscopy through Protium/Deuterium Isotope Effects

ChemBioChem ◽  
2008 ◽  
Vol 9 (17) ◽  
pp. 2860-2871 ◽  
Author(s):  
Aizhuo Liu ◽  
Jifeng Wang ◽  
Zhenwei Lu ◽  
Lishan Yao ◽  
Yue Li ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Nmr Spectroscopy ◽  
Isotope Effects ◽  
Side Chain ◽  
Large Proteins ◽  
Configuration Assignment ◽  
Deuterium Isotope Effects

Deuterium isotope effects in liquid-liquid phase diagrams : methanol + n-hexane systems

1982 ◽  
Vol 35 (7) ◽  
pp. 1281 ◽  
Author(s):  
JR Khurma ◽  
DV Fenby
Keyword(s):  
Hydrogen Bond ◽  
Liquid Phase ◽  
Phase Diagrams ◽  
Isotope Effects ◽  
Dispersion Interactions ◽  
Deuterium Isotope Effects ◽  
London Dispersion ◽  
Critical Solution Temperatures

Liquid-liquid phase diagrams have been measured for the systems CH3OH+n-C6H14, CH3OH + n-C6D14, CH3OD + n-C6HI4 and CH3OD + n-C6D14. The upper critical solution temperatures of these systems are 306.70, 304.30, 307.59 and 304.84 K, respectively. The results are in accord with the qualitative predictions of the Rabinovich theory, which considers hydrogen bond and London dispersion interactions.

scholarly journals A Spectroscopic Overview of Intramolecular Hydrogen Bonds of NH…O,S,N Type

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2409
Author(s):  
Poul Erik Hansen
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Ring Current ◽  
Chemical Shifts ◽  
Isotope Effects ◽  
Intramolecular Hydrogen Bonding ◽  
Bond Energies ◽  
Deuterium Isotope Effects ◽  
Intramolecular Hydrogen ◽  
Hydrogen Bond Energies

Intramolecular NH…O,S,N interactions in non-tautomeric systems are reviewed in a broad range of compounds covering a variety of NH donors and hydrogen bond acceptors. 1H chemical shifts of NH donors are good tools to study intramolecular hydrogen bonding. However in some cases they have to be corrected for ring current effects. Deuterium isotope effects on 13C and 15N chemical shifts and primary isotope effects are usually used to judge the strength of hydrogen bonds. Primary isotope effects are investigated in a new range of magnitudes. Isotope ratios of NH stretching frequencies, νNH/ND, are revisited. Hydrogen bond energies are reviewed and two-bond deuterium isotope effects on 13C chemical shifts are investigated as a possible means of estimating hydrogen bond energies.

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