Electron-transfer reactions of copper complexes. 1. A kinetic investigation of the oxidation of bis(1,10-phenanthroline)copper(I) by hydrogen peroxide in aqueous and sodium dodecyl sulfate solution

Effect of Biologically Significant Metal Complex Additives on the Micellar Properties of SDS

“…We found that the CMC value decreased in the following order. calcium oxalate < calcium fluoride < calcium chloride < calcium acetate Ponganis et al [13] interpreted the turbidity observed in aqueous solutions of SDS containing [Cu(phen) 2 ] + (phen=1,10-phenanthroline) below the CMC occurred from ion pair formation between the metal chelate ion and the polar head groups of the surfactant anions. Meisel et al [14] compared the absorption spectra of [Ru(bpy) 3 ] 2+ (bpy=2,2′-bipyridine) in aqueous SDS solutions with those in aliphatic alcohols and observed evidence that [Ru(bpy) 3 ] 2+ interacted with the hydrocarbon part rather than the polar head group of SDS.…”

Diffusion Interactions of Some Biologically Important Transition Metal Complexes on Micellar Properties of Sodium Dodecyl Sulphate

“…As the concentration of the metal complexes increase gradually, there is a sharp decrease in CMC values from 8.20 mM. There have been inconsistent reports about the effect of metal complexes on the micelle formation of anionic surfactant in solution; one is that the effect is similar to that of a simple cation of the same charge [11][12][13][14], and the other claims that the CMC is greatly reduced [15,16] and sometimes induces separation of viscous liquid phase [15]. Generally, the CMC of anionic surfactants should systematically decrease by the addition of an electrolyte [17][18][19].…”

“…Generally, the CMC of anionic surfactants should systematically decrease by the addition of an electrolyte [17][18][19]. Ponganis et al [14] interacted with the hydrocarbon part rather than the polar head group of SDS. The association of the metal complexes to pre-micellar aggregates is fundamentally considered as hydrophobic interaction but electrostatic interaction is significant too.…”

Kinetics and mechanisms of decomposition reaction of hydrogen peroxide in presence of metal complexes

“…The kinetics and stoichiometry of the hydrogen peroxide oxidation of Cu(I) to Cu(II) have been investigated for bis(1,10-phenanthroline) complex and its substituents [17 -19]. At pH ϭ 5.8, the Cu(I) : H 2 O 2 stoichiometry was 2 : 1 [17]. Under pseudo-first-order conditions, the reaction rate was first order in oxidant and reductant [17 -19], zero order in [H ϩ ] (5.8 Յ pH Յ 7.8), and reaches a limiting value at high phenanthroline concentrations.…”

“…Under pseudo-first-order conditions, the reaction rate was first order in oxidant and reductant [17 -19], zero order in [H ϩ ] (5.8 Յ pH Յ 7.8), and reaches a limiting value at high phenanthroline concentrations. In the presence of added anionic surfactants, sodium dodecyl sulphate (0.05 M), the stoichiometric ratio of Cu(I) : H 2 O 2 changes to 1 : 1, removes the phenanthroline dependence, and slows the reaction 20-fold [17]. This rate retardation was ascribed either to the increase in the redox potential of Cu(phen) / 2ϩ 2 Cu(phen) couple as a result of decreasing polarity of ϩ 2 the medium or to the ion pair formation between Cu(I)-complex and an anionic head group, resulting in the hindered approach of the peroxide molecule.…”