Anionic Effects on the Hydrolysis of p-Nitrophenyl Diphenyl Phosphate in Surface Active [Cu(R-tmed)X2] and [Cu(R-tmed)(acac)X] Complexes Where R-tmed = N, N, N′-Trimethyl-N′-alkylethylenediamine and X = Halide or Nitrate

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

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Abstract

The effects of the change of anion on the rate of hydrolysis of p -nitrophenyl diphenyl phosphate in [Cu(R-tmed)X2] and [Cu(R-tmed)(acac)X] micelles were studied at 25°C. It was found that the rate maxima of the bromide and nitrate complexes are lower than those of the chloride complexes. The effect is slightly more pronounced in the [Cu(R-tmed)X2] micelles. The pH-concentration profiles demonstrate the presence of the active copper(II)-OH species in the micelles and the kinetic results can be rationalized in terms of a multiple-equilibrium scheme which determines the concentration of the copper(II)-OH species under various conditions.

Original languageEnglish
Pages (from-to)442-446
Number of pages5
JournalJournal of Colloid and Interface Science
Volume157
Issue number2
DOIs
Publication statusPublished - May 1993
Externally publishedYes

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