Donor Numbers for Binary Mixtures of Dimethyl Sulfoxide with Dipolar Aprotic Solvents

1994 ◽  
Vol 59 (10) ◽  
pp. 2201-2208 ◽  
Author(s):  
Jadwiga Rzeszotarska ◽  
Przemyslaw Ranachowski ◽  
Marek K. Kalinowski
Keyword(s):  
Solvent Effect ◽  
Dimethyl Sulfoxide ◽  
Binary Mixtures ◽  
Mixed Solvent ◽  
Aprotic Solvents ◽  
Visible Absorption ◽  
Stability Constants Of Complexes ◽  
Donor Numbers ◽  
The Stability ◽  
Dipolar Aprotic Solvents

Solvent effect on the visible absorption spectrum of (acetylacetonato)(N,N,N',N'-tetramethylethylene-diamine)copper(II) was applied to estimate DN, the donor numbers of the binary mixtures of dimethyl sulfoxide with a series of other dipolar aprotic solvents. It was found that resulting DN values may be treated as explanatory parameters in the description of the mixed solvent effect on the stability constants of complexes formed by some macrocyclic ligands with univalent cations.

Acceptor Numbers for Binary Mixtures of Dipolar Aprotic Solvents with Methanol

1994 ◽  
Vol 59 (6) ◽  
pp. 1349-1355 ◽  
Author(s):  
Malgorzata Podsiadla ◽  
Jadwiga Rzeszotarska ◽  
Marek K. Kalinowski
Keyword(s):  
Dimethyl Sulfoxide ◽  
Binary Mixtures ◽  
Preferential Solvation ◽  
Molar Fraction ◽  
Liquid Structure ◽  
Aprotic Solvents ◽  
Hexamethylphosphoric Triamide ◽  
Acceptor Numbers ◽  
Dipolar Aprotic Solvents

Using bis(cyano)bis(9,10-phenanthroline)iron(II) as solvatochromic indicator, the acceptor numbers, AN, were determined for binary mixtures of benzene, benzonitrile, acetonitrile, acetone, N,N-dimethylformamide, dimethyl sulfoxide and hexamethylphosphoric triamide with methanol. Deviations from linearity of the plots of AN values against the molar fraction of the components were interpreted both in terms of changes in solvent liquid structure and in cathegories of preferential solvation.

Solvation of ions by dipolar aprotic solvents and water. A CNDO/2 study

1985 ◽  
Vol 50 (11) ◽  
pp. 2493-2508 ◽  
Author(s):  
Petr Kyselka ◽  
Zdeněk Havlas ◽  
Ivo Sláma
Keyword(s):  
Binary Mixtures ◽  
Quantum Chemical ◽  
Chemical Method ◽  
Molecular Structures ◽  
Dimethyl Sulphoxide ◽  
Ternary Mixtures ◽  
Aprotic Solvents ◽  
Quantum Chemical Method ◽  
Solvation Of Ions ◽  
Dipolar Aprotic Solvents

Solvation of Li+, Be2+, Na+, Mg2+, and Al3+ ions has been studied in binary mixtures with dimethyl sulphoxide, dimethylformamide, acetonitrile and water, and in ternary mixtures of the organic solvents with water. The CNDO/2 quantum chemical method was used to calculate the energies of solvation, molecular structures and charge distributions for the complexes acetonitrile...ion (1:1, 2:1, 4:1), dimethyl sulphoxide...ion (1:1), dimethylformamide...ion (1:1), and acetonitrile (dimethyl sulphoxide, dimethylformamide)...ion...water (1:1:1).

Solvation of the halide anions in dimethyl sulfoxide. Factors involved in enhanced reactivity of negative ions in dipolar aprotic solvents

1984 ◽  
Vol 106 (21) ◽  
pp. 6140-6146 ◽  
Author(s):  
Tom F. Magnera ◽  
Gary Caldwell ◽  
Jan Sunner ◽  
Sigeru Ikuta ◽  
Paul Kebarle
Keyword(s):  
Dimethyl Sulfoxide ◽  
Negative Ions ◽  
Aprotic Solvents ◽  
Halide Anions ◽  
Dipolar Aprotic Solvents

Electron-transfer reactions in non-aqueous media. VII. Reduction of CoF(NH3)52+ and Co(HCOO)(NH3)52+ by copper(I) in dimethyl sulfoxide-water mixtures

1983 ◽  
Vol 36 (10) ◽  
pp. 1923 ◽  
Author(s):  
JMB Harrowfield ◽  
L Spiccia ◽  
DW Watts
Keyword(s):  
Electron Transfer ◽  
Dimethyl Sulfoxide ◽  
Aqueous Media ◽  
Mixed Solvents ◽  
Transfer Reactions ◽  
Aprotic Solvents ◽  
Aqueous Mixtures ◽  
Electron Transfer Reactions ◽  
Dipolar Aprotic Solvents ◽  
Sphere Mechanism

Previous work on the reduction of a series of cobalt(III) complexes by iron(II) in dipolar aprotic solvents and in aqueous mixtures has been extended to reduction by copper(I). The greater stability of copper(I) to disproportionation in these media has permitted the study of the reduction of CoF(NH3)52+ and Co(HCOO)(NH3)52+ in range of solvents over a number of temperatures with a precision not possible in previous studies in water. The results are consistent with an inner-sphere mechanism in which the copper(I) reductant is preferentially solvated by dimethyl sulfoxide to the exclusion of water in mixed solvents.

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.

Complexing ability of monensin anion for alkali metal cations in binary mixtures of dipolar aprotic solvents

1997 ◽  
Vol 101 (8) ◽  
pp. 1154-1157 ◽  
Author(s):  
E. Wagner-Czauderna ◽  
J. Rzeszotarska ◽  
E. Orłowska ◽  
M. K. Kalinowski
Keyword(s):  
Alkali Metal ◽  
Binary Mixtures ◽  
Metal Cations ◽  
Aprotic Solvents ◽  
Alkali Metal Cations ◽  
Complexing Ability ◽  
Dipolar Aprotic Solvents
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