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Enhanced Rates of Organic Dehalogenations in a Microemulsion Using Adsorbed Metal Phthalocyanines on Electrodes
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    Enhanced Rates of Organic Dehalogenations in a Microemulsion Using Adsorbed Metal Phthalocyanines on Electrodes
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    Department of Chemistry, University of Nairobi, P.O. Box 30197, Nairobi, Kenya
    Department of Chemistry, Box U-60, University of Connecticut, Storrs, Connecticut 06269-4060
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    Langmuir

    Cite this: Langmuir 1996, 12, 11, 2645–2649
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    https://doi.org/10.1021/la951076p
    Published May 29, 1996
    Copyright © 1996 American Chemical Society

    Abstract

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    Copper and nickel phthalocyanines and their tetrasulfonates adsorbed onto carbon electrodes were used for electrochemical catalytic reduction of 1,2-dibromobutane (DBB), trans-1,2-dibromocyclohexane (DBCH), and trichloroacetic acid (TCA) in a bicontinuous microemulsion made from didodecyldimethylammonium bromide (DDAB), dodecane, and water and in homogeneous acetonitrile/water. Square wave voltammetry was used to obtain apparent pseudo-first-order rate constants (k‘) for the rate-determining step (rds) involving reaction of organohalides with catalysts reduced by two electrons. Reductions of DBCH and DBB gave larger k‘ values in the microemulsion than in homogeneous solvent. For reduction of TCA, larger k‘ values were found in the homogeneous solvent. Results suggest that DBCH and DBB give higher reaction rates in the microemulsion because of preconcentration of the relatively nonpolar organohalides into a surfactant film on the MPCTS-coated electrode. TCA may be partly rejected from the film, decreasing its reaction rate. Thus, when using electrodes with adsorbed catalysts in microemulsions, reactant concentration in an adsorbed film on the electrode appears to be an important rate-controlling factor.

    Copyright © 1996 American Chemical Society

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     Abstract published in Advance ACS Abstracts, May 1, 1996.

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    This article is cited by 23 publications.

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    Langmuir

    Cite this: Langmuir 1996, 12, 11, 2645–2649
    Click to copy citationCitation copied!
    https://doi.org/10.1021/la951076p
    Published May 29, 1996
    Copyright © 1996 American Chemical Society

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