Abstract
Abstract Micellar properties of surface active mixed copper(II) chelates, [Cu(R-tmed)(acac)X] (where R-tmed = N,N,N′-trimethyl-N′-alkylethylenediamine, R = C12H25 to C16H33, acac = acetylacetonate and X = Cl, Br) and [Cu(C12-tmed)(acac)Cl] (where C16-dmed = N,N′-dimethyl-N-cetylethylenediamine) were investigated by surface tensiometry, conductivity, viscosity and light scattering studies. In aqueous solution, they have a large negative standard free energy of adsorption at the air/water interface and a negative standard free energy of micellization. The degree of dissociation of the halide ions from the positively charged micelles falls in the range 0.22–0.29, with the [Cu(C12-tmed)(acac)Cl] micelle having the largest degree in the series studied. Viscosity and light scattering experiments suggest that the shape of the [Cu(C12-tmed)(acac)Cl] micelle is a sphere and that of its C16 analogue is an ellipsoid.
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