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Kinetics of dissociation of tris-(2,2′-bipyridyl) iron(II) in water solubilized by Triton X-100 reverse micelles
- Source :
- Journal of Colloid and Interface Science. 288:591-596
- Publication Year :
- 2005
- Publisher :
- Elsevier BV, 2005.
-
Abstract
- The dissociation of tris-(2,2'-bipyridyl) iron(II) ([Fe(bipy)(3)](2+)) has been studied in the Triton X-100/hexanol/cyclohexane reverse micellar medium. The reaction obeys simple first-order kinetics with no evidence of autoinhibition. The first-order rate constant (k(1)) has been determined at different values of W ([H2O]/[Triton X-100]). The rate (k(1)) decreases with increasing value of W. k(1) also increases with increase in Triton X-100 concentration at constant values of W, showing that the reaction takes place at greater speed at the micellar interface. The kinetic results can be interpreted by the monomolecular pseudo-phase model. The effect of W on rate (k(1)) is more pronounced in the range of W from 1.55 to 4.2 but less pronounced at higher W. The reaction is further accelerated by Cl- and SCN- ions and the kinetic results provide evidence for the formation of ion pairs between the cation [Fe(bipy)(3)](2+) and each of these anions. The formation of such ion pairs has not been observed in aqueous medium but has been reported earlier in aqueous-alcohol mixtures. This result therefore provides evidence for the lower micropolarity of solubilized water compared to ordinary water. (c) 2005
- Subjects :
- Racemization
Cyclohexane
Inorganic chemistry
Kinetics
Methanol Solutions
X-100
Micelle
Dissociation (chemistry)
Ion
Biomaterials
chemistry.chemical_compound
Colloid and Surface Chemistry
Reaction rate constant
Aerosol Ot
Water Pool
Triton X-100
Chemistry
Hydrolysis
Systems
Tris-(2,2 '-Bipyridyl) Iron(Ii)
Micropolarity
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Mixtures
Reverse Micelles
Ion Pair Formation
Microemulsions
Physical chemistry
Alcohol
Hexanol
Subjects
Details
- ISSN :
- 00219797
- Volume :
- 288
- Database :
- OpenAIRE
- Journal :
- Journal of Colloid and Interface Science
- Accession number :
- edsair.doi.dedup.....f3f4676291aa2a454a1052037542e8d8