Primary tritium and deuterium isotope effects on chemical shifts of compounds having an intramolecular hydrogen bond

2000 ◽  
Vol 38 (7) ◽  
pp. 525-535 ◽  
Author(s):  
Simon Bolvig ◽  
Poul Erik Hansen ◽  
Hiromi Morimoto ◽  
David Wemmer ◽  
Philip Williams
Keyword(s):  
Hydrogen Bond ◽  
Intramolecular Hydrogen Bond ◽  
Chemical Shifts ◽  
Isotope Effects ◽  
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.

Temperature dependence of chemical shifts of protons in hydrogen bonds. Experimental evidence on an intramolecular hydrogen bond

1968 ◽  
Vol 46 (17) ◽  
pp. 2865-2868 ◽  
Author(s):  
T. Schaefer ◽  
G. Kotowycz
Keyword(s):  
Hydrogen Bond ◽  
Carbon Tetrachloride ◽  
Chemical Shift ◽  
Hydrogen Bonds ◽  
Temperature Dependence ◽  
Intramolecular Hydrogen Bond ◽  
Chemical Shifts ◽  
Hydroxyl Proton ◽  
Intramolecular Hydrogen ◽  
Strong Intramolecular Hydrogen Bond

A temperature dependence of the chemical shift of the hydroxyl proton in the strong intramolecular hydrogen bond in 3,5-dichlorosalicylaldehyde is observed in carbon tetrachloride and benzene-d6 solutions. Its magnitude of 0.25 to 0.30 × 10−2 p.p.m. per ° C over a range of 100 °C is in agreement with the model described by Muller and Reiter (1).

Sign in / Sign up

Export Citation Format

Share Document