scholarly journals Medium Effects for Single Ions in Dimethyl Sulfoxide,N,N′-Dimethylformamide, and Propylene Carbonate

1974 ◽  
Vol 47 (6) ◽  
pp. 1334-1337 ◽  
Author(s):  
Niro Matsuura ◽  
Kisaburo Umemoto
Keyword(s):  
Dimethyl Sulfoxide ◽  
Propylene Carbonate ◽  
Medium Effects

Hammett-Streitwieser Reaction Constants for the Electroreduction of Diaryl Ketones in Aprotic Media

1996 ◽  
Vol 49 (8) ◽  
pp. 901 ◽  
Author(s):  
E Wagnerczauderna ◽  
MK Kalinowski
Keyword(s):  
Cyclic Voltammetry ◽  
Dimethyl Sulfoxide ◽  
Propylene Carbonate ◽  
Radical Anion ◽  
Electrode Reaction ◽  
Hexamethylphosphoric Triamide ◽  
Ketyl Radical ◽  
Donor Numbers ◽  
Reaction Constants ◽  
Solvent Acidity

Cyclic voltammetry has been used to measure formal potentials of seven aromatic ketone/ketyl radical anion systems in benzonitrile, acetonitrile , propylene carbonate, acetone, N,N- dimethylformamide, N-methylpyrrolidin-2-one, dimethyl sulfoxide and hexamethylphosphoric triamide. The values measured in each solvent obey the Hammett- Streitwieser equation; the reaction constants were found to depend on the solvent acidity and basicity expressed by acceptor and donor numbers, respectively. The results are discussed in terms of the solvation of the products and reactants of the electrode reaction.

Picosecond Dynamics of Molecular Entities in Lithium Salt Solutions in Dimethyl Sulfoxide, Propylene Carbonate, and Dimethyl Carbonate

2018 ◽  
Vol 63 (3) ◽  
pp. 245 ◽  
Author(s):  
M. I. Gorobets ◽  
S. A. Kirillov
Keyword(s):  
Dimethyl Sulfoxide ◽  
Propylene Carbonate ◽  
Molten Salts ◽  
Dimethyl Carbonate ◽  
Lithium Salt ◽  
Ion Pairs ◽  
Lithium Salts ◽  
Strong Interactions ◽  
Solvent Molecules ◽  
Contact Ion Pairs

An analysis of the Raman spectra of the solutions of lithium salts in dimethyl sulfoxide, propylene carbonate, and dimethyl carbonate in a concentration range from diluted solutions to the mixtures of molten solvates with salts has been performed in terms of the dynamics, specifically, the dephasing (тv) and modulation (тw) times of all molecular entities present in solutions are determined and analyzed. It has been found that, in the picosecond time domain, the dephasing and modulation in solvent molecules hydrogen-bonded with an anion and/or solvating a cation are slower than in free solvent molecules. In solvent separated ion pairs, both тv and тw are much longer than in solvated anions, thus indicating the strong interactions between anions and their surrounding. In contact ion pairs, тv are great, whereas тw appear close to those for free anions. This reflects that the structure of the liquid tends to the structure of molten salts.

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