Conductometric Studies of Sodium Tetraphenylborate, Tetrabutylammonium Bromide, and Sodium Tetrafluoroborate in N,N-Dimethylformamide at Temperatures from (283.15 to 318.15) K

2012 ◽  
Vol 57 (7) ◽  
pp. 2037-2043 ◽  
Author(s):  
Agnieszka Boruń ◽  
Adam Bald
Keyword(s):  
Tetrabutylammonium Bromide ◽  
Sodium Tetraphenylborate ◽  
Sodium Tetrafluoroborate

Electrical Conductances of Tetrabutylammonium Bromide, Sodium Tetraphenylborate and Sodium Bromide in 2-Ethoxyethanol in the Temperature Range 35–50°C

2004 ◽  
Vol 218 (5) ◽  
pp. 599-610 ◽  
Author(s):  
Purushottam Haldar ◽  
Bijan Das
Keyword(s):  
Ion Pairs ◽  
Tetrabutylammonium Bromide ◽  
Molar Conductance ◽  
Sodium Bromide ◽  
Sodium Tetraphenylborate ◽  
Temperature Range ◽  
Electrical Conductances ◽  
Conductance Data ◽  
Limiting Molar Conductance ◽  
Concentration Equation

AbstractThe electrical conductances of the solutions of tetrabutylammonium bromide (Bu4NBr), sodium tetraphenylborate (NaPh4B) and sodium bromide (NaBr) in 2-ethoxyethanol have been reported at 35, 40, 45 and 50°C. The conductance data have been analyzed by the 1978 Fuoss conductance–concentration equation in terms of the limiting molar conductance (Λ0), the association constant (KΛ) and the association diameter (R). The ionic contributions to the limiting molar conductances (Λ0) have been estimated using the “reference electrolyte” tetrabutylammonium tetraphenylborate (Bu4NPh4B). Appreciable ionic association was observed for all of these electrolytes which were found to exist in the form of solvent-separated ion-pairs in 2-ethoxyethanol. The tetrabutylammonium and tetraphenylborate ions are found to remain scarcely solvated whereas the sodium and bromide ions undergo substantial solvation in 2-ethoxyethanol medium in the temperature range investigated here.

Binding Constants for Cyclodextrin Inclusions by Competitive Spectrofluorometry Involving 6-(p-Toluidino)naphthalene-2-sulfonate

1992 ◽  
Vol 45 (12) ◽  
pp. 1961 ◽  
Author(s):  
MD Johnson ◽  
VC Reinsborough
Keyword(s):  
Binding Constants ◽  
Sodium Tetraphenylborate ◽  
Sodium Tetrafluoroborate

Binding constants of derivatized and simple β-cyclodextrins with a variety of inclusates were determined spectrofluorometrically through competition with 6-(p- toluidino )naphthalene- 2-sulfonate ( tns ). Inclusates in addition to tns were sodium alkane-1-sulfonates, sodium tetraphenylborate, sodium tetrafluoroborate, pyrazine and 4,4'-bipyridine.

Use of Nafion membranes in laboratory organic electrosynthesis

1988 ◽  
Vol 53 (12) ◽  
pp. 3164-3170 ◽  
Author(s):  
Jaromír Hlavatý ◽  
Jiří Volke
Keyword(s):  
Glassy Carbon ◽  
Quaternary Ammonium ◽  
Tetrabutylammonium Bromide ◽  
Nafion Membrane ◽  
Carbon Anode ◽  
Tetrabutylammonium Hydroxide ◽  
Nafion Membranes ◽  
Divided Cell ◽  
A Cell ◽  
Tetrabutylammonium Iodide

Electrolysis of quaternary ammonium bromides and iodides in a divided cell with a Nafion membrane yields quaternary polyhalogenides at a carbon anode in water-ethanolic anolytes. The electrodialysis of tetrabutylammonium iodide in a cell with a Nafion membrane enables generation of tetrabutylammonium hydroxide. In electrolytic reduction of nitrobenzene in presence of 1,3-dibromopropane, N-phenylisooxazolidine results in an approx. 60% yield. This electrosynthesis takes place in dimethylformamide with tetrabutylammonium bromide at a glassy-carbon cathode in a divided cell. In the electroreduction of lobelanine hydrogensulfate in a divided cell in acid water-ethanolic media at a lead cathode prevalently lobelanidine has been obtained.

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