Spectrophotometric study of metal-ligand reactions in isooctane/Brij30/water nonionic microemulsions

Celia Cabaleiro-Lago, L. Garcia-Rio, P. Herves, J. Perez-Juste

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The complexation between Ni2+ and pyridine-2-azo-p-dimethylaniline (PADA) was studied in isooctane/polyoxyethylenglycol dodecyl ether (Brij30)/water microemulsions at 25 degrees C. The apparent complexation constant depends on microemulsion composition. The proposed model, which takes into account the heterogeneity of the system at the microscopic scale, allows us to determine the distribution constants of both reactants and the complexation constant at the interface. The complex is less stable in microemulsion than in water due to a more efficient hydration of the nickel hexahydrate coordination complex that arises from the interaction between the polar head group of the surfactant and the interfacial water. (c) 2006 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)49-54
Number of pages5
JournalColloids and Surfaces APhysicochemical and Engineering Aspects
Issue number1-3
Publication statusPublished - 2007
Externally publishedYes

Swedish Standard Keywords

  • Physical Chemistry (10402)


  • metal ligand reaction
  • microemulsion


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