The photochemistry of EDA complexes in micellar solutions. II. The stilbene–methylviologen system in the presence of oxygen

1991 ◽  
Vol 69 (1) ◽  
pp. 146-150 ◽  
Author(s):  
M. Hamity ◽  
R. H. Lema
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Key Words ◽  
Methyl Viologen ◽  
Sodium Dodecyl ◽  
Cation Radical ◽  
Reaction Scheme ◽  
Quantum Yields ◽  
Micellar Solutions ◽  
Trans Stilbene ◽  
Donor Acceptor

The photolyses of electron donor–acceptor (EDA) complexes formed between both cis-stilbene (cS) and trans-stilbene (tS) as donors and mefhylviologen (MV+2) as acceptor have been carried out in homogeneous ethanolic and in micellar sodium dodecyl sulfate (SDS) solutions, in the presence of oxygen. The stilbene loss quantum yields (Φ−S) have been determined in both media. Quantum yields were observed to be dependent upon methylviologen concentration and the acidity of media. A reaction scheme is proposed, which accounts for experimental results and can be related to the photochemistry of MV+2 and its cation radical MV•+. Key words: EDA complexes, micelles, methyl viologen, stilbene.

The photochemistry of electron donor–acceptor (EDA) complexes in micellar solutions. I. The stilbene–methylviologen system

1988 ◽  
Vol 66 (7) ◽  
pp. 1552-1557 ◽  
Author(s):  
M. Hamity ◽  
R. H. Lema
Keyword(s):  
Electron Donor ◽  
Sodium Dodecyl ◽  
Reaction Scheme ◽  
Local Concentration ◽  
Micellar Solutions ◽  
Yield Value ◽  
Trans Stilbene ◽  
Donor Acceptor ◽  
Volmer Plot ◽  
Upward Curvature

The association constants for the electron donor–acceptor (EDA) complexes formed between both cis-stilbene (cS) and trans-stilbene (tS) as donors and methylviologen (MV+2) as acceptor were determined in ethanol and micellar sodium dodecyl sulfate (SDS) solutions in the range of SDS concentration 0.05–0.1 M. The values obtained in micellar solutions were much higher than those in ethanol and were heavily dependent upon SDS concentration. This effect is due to an increase in the local concentration of the reactants in the micellar pseudophase. The tS fluorescence quenching by MV+2 was also studied in the same solvent media. In ethanol, the Stern–Volmer plot was found to be linear, with quenching constant (KSV) similar to the association constant determined by the absorption method. In micellar solutions, although upward curvature of the Stern–Volmer plots was observed, a reaction scheme based on static quenching via ground state EDA complex is proposed, which explains the experimental results. Irradiation in the absorption band of the EDA complexes formed by tS or cS and MV+2 was carried out in ethanol and SDS solutions, in the absence of oxygen. Only cis–trans isomerization of cS in SDS solution was observed, with a quantum yield value of Φcis = 0.012.

Synthesis of Copper Nanoparticles Using Hydrazine in Micellar Solutions of Sodium Dodecyl Sulfate

2019 ◽  
Vol 74 (1) ◽  
pp. 14-19
Author(s):  
N. N. Begletsova ◽  
O. A. Shinkarenko ◽  
E. I. Selifonova ◽  
O. Yu. Tsvetkova ◽  
A. J. K. Al-Alwani ◽  
...  
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Copper Nanoparticles ◽  
Sodium Dodecyl ◽  
Micellar Solutions ◽  
Dodecyl Sulfate

Receptor properties of calix[4]resorcinarenes toward tetramethylammonium and choline cations in micellar solutions of sodium dodecyl sulfate

2006 ◽  
Vol 55 (8) ◽  
pp. 1419-1424 ◽  
Author(s):  
A. R. Mustafina ◽  
Yu. G. Elistratova ◽  
V. V. Syakaev ◽  
R. R. Amirov ◽  
A. I. Konovalova
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Sodium Dodecyl ◽  
Micellar Solutions ◽  
Dodecyl Sulfate

Protein composition of Methanococcus thermolithotrophicus flagella

1992 ◽  
Vol 38 (11) ◽  
pp. 1162-1166 ◽  
Author(s):  
Alla S. Kostyukova ◽  
Georgi M. Gongadze ◽  
Anna Ya. Obraztsova ◽  
Konstantin S. Laurinavichus ◽  
Oleg V. Fedorov
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Key Words ◽  
Gel Electrophoresis ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Protein Composition ◽  
Complete Removal ◽  
Methanococcus Thermolithotrophicus ◽  
Molecular Weights ◽  
Dodecyl Sulfate

Sodium dodecyl sulfate – polyacrylamide gel electrophoresis of flagella from the thermophilic methanogen Methanococcus thermolithotrophicus indicated that they were composed of three major proteins, with molecular weights of 62 000,44 000, and 26 000, whereas all previously studied flagella of mesophilic methanogens consisted of two subunits. Proteins were isolated by preparative electrophoresis followed by complete removal of sodium dodecyl sulfate and their renaturation. It was shown that at least two of the proteins contain a thermostable domain whose complete denaturation proceeds only upon prolonged boiling in the presence of sodium dodecyl sulfate. Key words: flagellin, thermostability, archaebacteria, Methanococcus thermolithotrophicus.

Structure and dynamics of concentrated micellar solutions of sodium dodecyl sulfate

2016 ◽  
Vol 65 (1) ◽  
pp. 158-166 ◽  
Author(s):  
A. T. Gubaidullin ◽  
I. A. Litvinov ◽  
A. I. Samigullina ◽  
O. S. Zueva ◽  
V. S. Rukhlov ◽  
...  
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Sodium Dodecyl ◽  
Micellar Solutions ◽  
Structure And Dynamics ◽  
Dodecyl Sulfate
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