New deuterium isotope effects on 13C and 19F chemical shifts across intramolecular hydrogen bonds of non-resonance assisted systems

2005 ◽  
Vol 46 (5) ◽  
pp. 839-842 ◽  
Author(s):  
Jacek G. Sośnicki ◽  
Poul Erik Hansen
Keyword(s):  
Hydrogen Bonds ◽  
Chemical Shifts ◽  
Isotope Effects ◽  
Intramolecular Hydrogen Bonds ◽  
Deuterium Isotope Effects ◽  
Intramolecular Hydrogen

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.

scholarly journals Unusual Effects of Intramolecular Hydrogen Bonds and Dipole Interaction on FTIR and NMR of Some Imines

2019 ◽  
pp. 1-6 ◽  
Author(s):  
Elham Abdalrahem Bin Selim ◽  
Mohammed Hadi Al–Douh
Keyword(s):  
Hydrogen Bonds ◽  
Chemical Shifts ◽  
Dipole Interaction ◽  
Intramolecular Hydrogen Bonds ◽  
X Ray ◽  
X Ray Crystallography ◽  
Dipole Interactions ◽  
Intramolecular Hydrogen

Unusual effects of intramolecular hydrogen bonds and dipole interactions are investigated using FTIR, NMR and X-Ray crystallography analyses of some imines. These phenomena affect both FTIR absorptions and chemical shifts.

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