A Proton NMR Study on the Kinetics of Protolysis and Water Exchange in Mixed Solvent Systems, Beryllium(II) Nitrate in Water-Dimethyl Sulfoxide(d6) and Water-Acetone(d6) Mixtures

1980 ◽  
Vol 84 (8) ◽  
pp. 754-758 ◽  
Author(s):  
Jens Frahm
Keyword(s):  
Dimethyl Sulfoxide ◽  
Water Exchange ◽  
Mixed Solvent ◽  
Proton Nmr ◽  
Nmr Study ◽  
Solvent Systems ◽  
Kinetics Of

Rates of Dimethyl Sulfoxide Exchange in Monoalkyl Cationic Platinum(II) Complexes Containing Nitrogen Bidentate Ligands. A Proton NMR Study

1996 ◽  
Vol 35 (17) ◽  
pp. 5087-5096 ◽  
Author(s):  
Raffaello Romeo ◽  
Luigi Monsù Scolaro ◽  
Nicola Nastasi ◽  
Giuseppe Arena
Keyword(s):  
Dimethyl Sulfoxide ◽  
Proton Nmr ◽  
Bidentate Ligands ◽  
Nmr Study

Solute–solvent effects in the dissociation of thymolsulfonephthalein (an uncharged acid) in aqueous mixtures of acetonitrile (ACN), urea, and dimethyl sulfoxide (DMSO)

1986 ◽  
Vol 64 (8) ◽  
pp. 1521-1526 ◽  
Author(s):  
A. L. De ◽  
A. K. Atta
Keyword(s):  
Solvent Effect ◽  
Dimethyl Sulfoxide ◽  
Solvent Effects ◽  
Mixed Solvent ◽  
Dissociation Constants ◽  
Aqueous Mixtures ◽  
Solvent Interactions ◽  
Gibbs Energies ◽  
Gibbs Energies Of Transfer ◽  
Solvent Systems

The thermodynamic first dissociation constants, [Formula: see text] of thymolsulfonephthalein (H2A), an uncharged acid, have been determined at 25 °C in aqueous mixtures of 10, 30, 50, 70, and 80 wt% acetonitrile (ACN), 11.52, 20.31, 29.64, and 36.83 wt% urea, 20, 40, 60, and 80 wt% dimethyl sulfoxide (DMSO) by spectrophotometric measurements. The solvent effect represented by ∂(ΔG0) = 2.303RT[p(sK)N − p(wK)N] is found to increase in ACN + H2O system as mol% ACN increases in the solvent. In contrast, the corresponding values in urea + H2O as well as DMSO + H2O solvent systems decrease with increase in proportion of organic component in the solvent, the decrease being sharp in urea + H2O. The results have been discussed in terms of the standard Gibbs energies of transfer of H+ from water to the mixed solvent, [Formula: see text] and the relative values of the standard Gibbs energies of transfer of HA−, [Formula: see text] and of [Formula: see text] in all the solvent systems. The overall dissociation behaviour of the acid (H2A) is found to be dictated by the specific solute-solvent interactions of the species participating in the dissociation equilibria.

Gas and liquid phase proton NMR study of the conformational kinetics of ethyl, n-propyl, and neopentyl nitrite

1986 ◽  
Vol 90 (18) ◽  
pp. 4388-4393 ◽  
Author(s):  
Claire B. Conboy ◽  
J. Paul Chauvel ◽  
Nancy S. True
Keyword(s):  
Liquid Phase ◽  
Proton Nmr ◽  
Nmr Study ◽  
Kinetics Of
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