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Electrochemical Monitoring of Proton Transfer across Liquid/Liquid Interfaces on the Surface of Graphite Electrodes

Chung, Taek Dong and Anson, Fred C. (2001) Electrochemical Monitoring of Proton Transfer across Liquid/Liquid Interfaces on the Surface of Graphite Electrodes. Analytical Chemistry, 73 (2). pp. 337-342. ISSN 0003-2700. https://resolver.caltech.edu/CaltechAUTHORS:20160727-100827075

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Abstract

Equilibrium partitioning of HClO_4 between aqueous solutions and benzonitrile (BN) or nitrobenzene (NB) was measured and used to evaluate the pKa of the acid in the two organic solvents. The potential drop across the BN/H_2O interface was evaluated from the known potential drop across the NB/H_2O interface and the voltammetrically measured formal potential of a ferrocenium/ferrocene redox couple confined within thin layers of the two organic solvents. The voltammetric reduction of tetrachloro-1, 4-benzoquinone in thin layers of BN was used to monitor changes in the concentration of protons in the layer during proton-consuming faradaic reactions. The rate of proton transfer from the aqueous to the nonaqueous phase across the BN/H_2O interface was shown to be adequate to sustain proton-consuming reactions at the electrode/BN interface.


Item Type:Article
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http://dx.doi.org/10.1021/ac0009447DOIArticle
http://pubs.acs.org/doi/abs/10.1021/ac0009447PublisherArticle
Additional Information:© 2001 American Chemical Society. Received for review August 10, 2000. Accepted October 30, 2000. Publication Date (Web): December 14, 2000. This work was supported by the National Science Foundation. T.D.C. acknowledges partial support from the Korea Science and Engineering Foundation. Dr. Chunnian Shi provided essential expertise and helpful discussions. We are grateful to Prof. Steven Strauss of Colorado University for the generous gift of the hydrophobic ferrocene, HMFc.
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Korea Science and Engineering FoundationUNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20160727-100827075
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160727-100827075
Official Citation:Electrochemical Monitoring of Proton Transfer across Liquid/Liquid Interfaces on the Surface of Graphite Electrodes Taek Dong Chung and Fred C. Anson Analytical Chemistry 2001 73 (2), 337-342 DOI: 10.1021/ac0009447
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69244
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:27 Jul 2016 18:26
Last Modified:03 Oct 2019 10:20

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