PROTON MAGNETIC RESONANCE SHIFTS FOR THE H2O–SO3 SYSTEM AND SOME ELECTROLYTE SOLUTIONS IN SULPHURIC ACID

1960 ◽  
Vol 38 (8) ◽  
pp. 1371-1380 ◽  
Author(s):  
R. J. Gillespie ◽  
R. F. M. White
Keyword(s):  
Hydrogen Bonding ◽  
Magnetic Resonance ◽  
Aqueous Solutions ◽  
Sulphuric Acid ◽  
Proton Magnetic Resonance ◽  
Electrolyte Solutions ◽  
Degree Of Ionization ◽  
Solvent Interactions ◽  
Ionization Of Water

Proton magnetic resonance shifts have been measured for the H2O–SO3 system. The results have been used to calculate the degree of ionization of water in solutions containing excess sulphuric acid. The shifts produced by a number of electrolytes in sulphuric acid have also been measured. The results are interpreted in terms of solute–solvent interactions, particularly polarization and hydrogen bonding, and are compared with the results of similar previous measurements on aqueous solutions.

A proton magnetic resonance study of the deuterium-protium fractionation in aqueous solutions of alkali-metal chlorides

1984 ◽  
Vol 88 (12) ◽  
pp. 2669-2671 ◽  
Author(s):  
Omar A. El Seoud ◽  
Monica I. El Seoud ◽  
Paulo A. R. Pires ◽  
Joao P. S. Farah
Keyword(s):  
Magnetic Resonance ◽  
Alkali Metal ◽  
Aqueous Solutions ◽  
Proton Magnetic Resonance ◽  
Magnetic Resonance Study ◽  
Alkali Metal Chlorides ◽  
Metal Chlorides ◽  
Proton Magnetic Resonance Study

Proton magnetic resonance in aqueous solutions of poly-l-lysine hydrobromide

1975 ◽  
Vol 19 (3) ◽  
pp. 267-278 ◽  
Author(s):  
D.R Woodhouse ◽  
W Derbyshire ◽  
P Lillford
Keyword(s):  
Magnetic Resonance ◽  
Aqueous Solutions ◽  
Proton Magnetic Resonance

Solvent effects in ultraviolet spectral studies of hydrogen bonding between phenol and N,N-dimethylacetamide

1967 ◽  
Vol 45 (18) ◽  
pp. 2033-2038 ◽  
Author(s):  
F. Takahashi ◽  
W. J. Karoly ◽  
J. B. Greenshields ◽  
N. C. Li
Keyword(s):  
Hydrogen Bonding ◽  
Magnetic Resonance ◽  
Complex Formation ◽  
Equilibrium Constant ◽  
Proton Magnetic Resonance ◽  
Mixed Solvent ◽  
Resonance Method ◽  
Spectral Studies ◽  
Magnetic Resonance Method ◽  
Hydrogen Bonded

Ultraviolet spectral studies of hydrogen bonding between phenol and N,N-dimethylacetamide (DMA) in several media are reported. The equilibrium constant for the formation of the phenol–DMA complex is strongly solvent dependent, varying from 295 1/mole in cyclohexane to 130 in CCl4 and 16 in CHCl3, all at 28°. The greatly reduced value in CHCl3 indicates that the measured equilibrium constant is only an apparent one which does not take into account the decrease in free DMA concentration resulting from hydrogen-bonded complex formation with the solvent acting as hydrogen donor. In CCl4/CHCl3 mixed solvent, in the range of [chloroform] = 0 to 1.227 M, the measured equilibrium constant, K′, varies linearly with K′ [chloroform]. The slope of the line corresponds to the equilibrium constant for the formation of the hydrogen-bonded complex between CHCl3 and DMA in CCl4. The value, 0.9 1/mole, agrees with that obtained from a proton magnetic resonance method. The agreement is particularly noteworthy when we consider that the concentrations of phenol used in the proton magnetic resonance and ultraviolet spectral methods differ by a factor of 200, which leads definitely to the conclusion that the hydrogen-bonded CHCl3–DMA complex formed is 1:1. In cyclohexane/CHCl3 mixed solvent, similar results are obtained.

Selective deshielding of aromatic protons in some ortho-substituted acetanilides

1968 ◽  
Vol 46 (15) ◽  
pp. 2593-2600 ◽  
Author(s):  
James R. Bartels-Keith ◽  
Ronald F. W. Cieciuch
Keyword(s):  
Hydrogen Bonding ◽  
Magnetic Resonance ◽  
Solvent Effects ◽  
Proton Magnetic Resonance ◽  
Aromatic Proton ◽  
Intramolecular Hydrogen Bonding ◽  
Low Field ◽  
Intramolecular Hydrogen

Certain ortho-substituted acetanilides exhibit proton magnetic resonance signals at unusually low field for the amido proton and the aromatic proton adjacent to the acetamido group. This effect, explicable in terms of intramolecular hydrogen-bonding, has been observed for nitro, carbonyl, sulfamoyl, and sulfonyl substituents. Solvent effects are discussed.

Proton magnetic resonance of some methyl-substituted pyridines and pyridinium ions in aqueous solutions

1972 ◽  
Vol 7 (3) ◽  
pp. 247-252 ◽  
Author(s):  
Melvyn W Mosher ◽  
Chandra B Sharma ◽  
M.R Chakrabarty
Keyword(s):  
Magnetic Resonance ◽  
Aqueous Solutions ◽  
Proton Magnetic Resonance ◽  
Substituted Pyridines ◽  
Pyridinium Ions
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