scholarly journals Electron donor–acceptor complexes between naphthylamines and methyl viologen in aqueous sodium dodecyl sulphate solution

1986 ◽  
Vol 64 (5) ◽  
pp. 845-848 ◽  
Author(s):  
S. G. Bertolotti ◽  
J. J. Cosa ◽  
H. E. Gsponer ◽  
M. Hamity ◽  
C. M. Previtali
Keyword(s):  
Electron Donor ◽  
Sodium Dodecyl Sulphate ◽  
Methyl Viologen ◽  
Sodium Dodecyl ◽  
Local Concentration ◽  
Detergent Concentration ◽  
Aqueous Sodium ◽  
Sds Micelles ◽  
Donor Acceptor ◽  
Experimental Values

The electron donor–acceptor (EDA) interaction between methyl viologen (MV2+) and 1-naphthylamine (1NA), 2-naphthylamine (2NA), and N,N-dimethyl-1-naphthylamine (DMA) was studied in water and in aqueous sodium dodecyl sulphate (SDS). The experimental values of the association constants in water were 8.9, 9.8, and 2.8 M−1 for 1NA, 2NA, and DMA, respectively. In the presence of SDS the observed values were very much higher and strongly dependent upon the detergent concentration. The enhancement in the interaction is due to an increase in the local concentration of the partners in the micellar pseudophase. MV2+ itself was shown to strongly interact with the micelles. A new absorption is present at the red tail of the spectrum of MV2+ in the presence of SDS micelles. An association constant of 1700 M−1 was obtained from this absorption.

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.

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.

scholarly journals Solvation Study of Neem Oil in Aqueous Sodium Dodecyl Sulphate at different Temperatures

2017 ◽  
Vol Volume-2 (Issue-1) ◽  
pp. 652-661
Author(s):  
P. seethalakshmi ◽  
K. Renuka Devi ◽  
R.Seema | J. Benazir Jiya ◽  
Keyword(s):  
Sodium Dodecyl Sulphate ◽  
Sodium Dodecyl ◽  
Neem Oil ◽  
Aqueous Sodium ◽  
Different Temperatures

Interaction of Some Amino Acids with Sodium Dodecyl Sulphate in Aqueous Solution at Different Temperatures

2011 ◽  
Vol 66 (5) ◽  
pp. 345-352
Author(s):  
Anwar Ali ◽  
Firdoos Ahmad Itoo ◽  
Nizamul Haque Ansari
Keyword(s):  
Amino Acids ◽  
Molar Volume ◽  
Sodium Dodecyl Sulphate ◽  
Apparent Molar Volume ◽  
Sodium Dodecyl ◽  
Partial Molar Volumes ◽  
Molar Refraction ◽  
Viscosity Data ◽  
Different Temperatures ◽  
Experimental Values

The density ρ, and viscosity η of 0.00, 0.05, 0.10, 0.15, and 0.20 mol kg−1 glycine (Gly), dlalanine (Ala), dl-serine (Ser), and dl-valine (Val) have been measured in 0.002 mol kg−1 aqueous sodium dodecyl sulphate (SDS) at 298.15, 303.15, 308.15, and 313.15 K. These data have been used to calculate the apparent molar volume φv, infinite dilution apparent molar volume φv°, and the standard partial molar volumes of transfer φv° (tr), of the amino acids from water to the aqueous SDS solutions. Falkenhagen coefficient A, Jones-Dole coefficient B, free energies of activation per mole of solvent (aqueous SDS) Δμ1°*, and per mole solute (amino acids) Δμ2°*, also enthalpy ΔH* and entropy ΔS* of activation of viscous flow were evaluated using viscosity data. The molar refraction RD was calculated by using experimental values of the refractive index nD of the systems. The results have been interpreted in terms of ion-ion, ion-polar and hydrophobic-hydrophobic group interactions. The volume of the transfer data suggest that ion-ion intertactions are predominant.

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