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.

Deuterium isotope effects in liquid-liquid phase diagrams: Water + phenol and water + 2-methylpropanoic acid systems

1983 ◽  
Vol 36 (2) ◽  
pp. 215 ◽  
Author(s):  
DV Fenby ◽  
JR Khurma ◽  
ZS Kooner ◽  
RF Smith
Keyword(s):  
Liquid Phase ◽  
Phase Diagrams ◽  
Isotope Effects ◽  
Dispersion Interactions ◽  
Exchange Reactions ◽  
Molar Excess ◽  
Deuterium Isotope Effects ◽  
London Dispersion ◽  
Molar Excess Volumes ◽  
System Water

Phase-separation temperatures Tp have been measured for the systems H2O+C6H5OH, H2O+ C6H5OD, H20+ CsD5OD, D20+ C6H50H, D2O+ C6H5OD, D2O+ C6DsOD, H2O+ (CH3)2CHCO2H and D2O+ (CH3)2CHCO2H. For water+ 2-methylpropanoic acid, the differences in the Tp-x curves for the exchange and no-exchange systems are striking. For water + phenol, on the other hand, the effect of deuterium-exchange reactions on the Tp-x curves is very small. The results for all systems are in accord with the qualitative predictions of the Rabinovich theory, which accounts for deuterium isotope effects in liquid-liquid phase diagrams in terms of hydrogen bond and London dispersion interactions. Molar excess enthalpies and molar excess volumes at 300.15 K are reported for the system water + 2-methylpropanoic acid. The results are compared with those for water + acetic acid.

Deuterium isotope effects in liquid–liquid phase diagrams of aniline+cyclohexane mixtures

2005 ◽  
Vol 238 (2) ◽  
pp. 169-173 ◽  
Author(s):  
Agnieszka Siporska ◽  
Ewa Starościak ◽  
Anna Makowska ◽  
Jerzy Szydłowski
Keyword(s):  
Liquid Phase ◽  
Phase Diagrams ◽  
Isotope Effects ◽  
Deuterium Isotope Effects

Deuterium isotope effects in liquid—liquid phase diagrams: A review

1981 ◽  
Vol 7 (3-4) ◽  
pp. 327-338 ◽  
Author(s):  
D.V. Fenby ◽  
Z.S. Kooner ◽  
J.R. Khurma
Keyword(s):  
Liquid Phase ◽  
Phase Diagrams ◽  
Isotope Effects ◽  
Deuterium Isotope Effects

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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