Organized media as redox catalysts

Pal, Tarasankar and de Lusignan, Swati and Jana, Nikhil R. and Pradhan, Narayan and Mandal, Rampada and Palmer, Ann P. and Beezer, Anthony E. and Mitchell, John C. (1998) Organized media as redox catalysts. Langmuir, 14 (17). pp. 4724-4730. ISSN 0743-7463. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Micellar catalysis for a methylene blue (MB)-ascorbate ion (AA(-)) redox reaction (activation energy 114 kJ mol(-1)) has been observed to occur because of the binding of the substrates onto the micellar surface by hydrophobic and electrostatic interaction. This increases the encounter probability, leading to a substantially accelerated reaction. The reported study indicates that the most likely substrate solubilization sites in micelles and reverse micelles are the interfacial and Stern regions. Studies on the effect of various salting-in and salting-out agents, an increase in the hydrophobicity of the dye, and the size of the reverse micellar water pool provide no evidence of deeper penetration into the micellar core. In addition, a fascile reversible electron-transfer reaction for the MB-AA(-) and MB-BH4- systems has been observed with coinage metal sol particles. Metal sol-induced catalysis occurs due to the availability of a suitable substrate which acts as a mediator for the electron-transfer reaction between MB and the reductant.

Item Type: Article
Subjects: Q Science
Q Science > QD Chemistry
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: M.A. Ziai
Date Deposited: 29 Mar 2009 09:17
Last Modified: 09 May 2014 08:05
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