Micellar properties of some surface active mixed copper(II) chelates

Y. Y. Lim, Eric H.L. Tan

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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(C16-dmed)(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.

Original languageEnglish
Pages (from-to)167-173
Number of pages7
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Issue number2-3
Publication statusPublished - 22 Jan 1996
Externally publishedYes


  • aggregation number
  • copper(II) mixed chelate micelles
  • degree of dissociation
  • micellization
  • surface properties

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