Electrical Conductances of Tetraethylammonium Bromide and Tetrapropylammonium Bromide in 2-Ethoxyethanol (1) + Water (2) Mixtures at (308.15, 313.15, 318.15, and 323.15) K

2005 ◽  
Vol 50 (5) ◽  
pp. 1768-1772 ◽  
Author(s):  
Purushottam Haldar ◽  
Bijan Das
Keyword(s):  
Tetraethylammonium Bromide ◽  
Electrical Conductances ◽  
Tetrapropylammonium Bromide

Viscosities of some tetraalkylammonium bromides in 2-ethoxyethanol at 308.15, 313.15, 318.15, and 323.15 K

2005 ◽  
Vol 83 (5) ◽  
pp. 499-504 ◽  
Author(s):  
Purushottam Haldar ◽  
Bijan Das
Keyword(s):  
Transition State ◽  
Tetrabutylammonium Bromide ◽  
Viscosity Data ◽  
Tetraethylammonium Bromide ◽  
Tetraalkylammonium Ions ◽  
Free Energy Of Activation ◽  
Tetrapropylammonium Bromide ◽  
Ionic Contribution ◽  
Tetraalkylammonium Ion ◽  
B Coefficients

The viscosities of the solutions of tetraethylammonium bromide (Et4NBr), tetrapropylammonium bromide (Pr4NBr), tetrabutylammonium bromide (Bu4NBr), tetrapentylammonium bromide (Pen4NBr), and tetraheptylammonium bromide (Hep4NBr) in 2-ethoxyethanol have been reported at 308.15, 313.15, 318.15, and 323.15 K. The viscosity data have been analyzed by the Jones–Dole equation for the associated electrolytes to evaluate the viscosity B coefficients of the electrolytes. These data have also been analyzed by the transition-state treatment to obtain the contribution of the solutes to the free energy of activation for viscous flow of the solution. The viscosity of the solvent is found to be greatly modified by the presence of all of the tetraalkylammonium ions investigated. Moreover, the tetraalkylammonium ions are found to be unsolvated in 2-ethoxyethanol solutions, they behave neither as structure-breaker nor as structure-maker and the formation of the transition state is made less favorable in their presence.Key words: viscosity, electrolytes, tetraalkylammonium ion, 2-ethoxyethanol, ionic contribution, solvation, transition-state treatment.

The effect of cation concentration on the nitrogen splitting constant of nitroxide free radicals

1990 ◽  
Vol 55 (10) ◽  
pp. 2377-2380
Author(s):  
Hamza A. Hussain
Keyword(s):  
Hydrogen Peroxide ◽  
Hydrogen Bonding ◽  
Free Radicals ◽  
Esr Spectroscopy ◽  
The Other ◽  
Tetraethylammonium Bromide ◽  
Splitting Constant ◽  
The One ◽  
Positively Charged ◽  
Two Equilibria

Nitroxide free radicals prepared from diethylamine, piperidine and pyrrolidine by oxidation with hydrogen peroxide were studied by ESR spectroscopy. The changes in the 14N splitting constant (aN) caused by the addition of KBr or tetraethylammonium bromide were measured in dependence on the concentration of the ions. For diethylamine nitroxide and piperidine nitroxide, the results are discussed in terms of two equilibria: the one, involving the anion, is associated with a gain or loss of hydrogen bonds to the nitroxide oxygen atom, the other is associated with the formation of solvent shared units involving the cation, which results in changes in the hydrogen bonding strenght. The large increase in the aN value in the case of pyrrolidine nitroxide is explained in terms of an interaction from one side of the positively charged N atom; the increase in aN in the case of diethylamine and piperidine nitroxides is explained in terms of interactions with both sides of the positively charged N atom.

Iodic Acid (HIO3) in Combination with Tetraethylammonium Bromide as a Catalyst for Selective and Accelerated Sulfoxidation

2005 ◽  
Vol 35 (21) ◽  
pp. 2805-2810 ◽  
Author(s):  
Paresh D. Salgaonkar ◽  
Vidyanand G. Shukla, ◽  
K. G. Akamanchi
Keyword(s):  
Tetraethylammonium Bromide ◽  
Iodic Acid

ChemInform Abstract: Tetraethylammonium Bromide-Catalyzed Oxidative Thioesterification of Aldehydes and Alcohols.

ChemInform ◽  
2014 ◽  
Vol 45 (21) ◽  
pp. no-no
Author(s):  
Xuebin Zhu ◽  
Yan Shi ◽  
Haibin Mao ◽  
Yixiang Cheng ◽  
Chengjian Zhu
Keyword(s):  
Tetraethylammonium Bromide
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