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Electron transfer reactions associated with ethyl viologen-β-cyclodextrin complexation: equilibrium and kinetic aspects

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Abstract

Formation of the complex of ethyl viologen in its cationic (Ev+•) and neutral (Ev∘) forms with β-cyclodextrin (β-CD) was investigated by means of voltammetric technique in buffer solution of pH 7.00. The number of βCD (n or m) per viologen species (Ev+•) or (Ev∘), bonding equilibrium constants as well as bonding rate constants was calculated. The calculated values of \(K_{\text{eq}}^{(1)}\) and \(K_{\text{eq}}^{ ( 2)}\) (pertaining to the bonding of Ev+• and Ev∘ with βCD) are 13.6 M–n and 2.1 × 103 M−m, respectively, whereas the calculated values of n and m are 0.54 and 1.25, respectively. The bimolecular rate constant for the Ev∘−βCD inclusion complex formation is 3.03 × 103 M−1s−1. These results are supported by the simulation of the experimental cyclic voltammograms. This study also highlights the significance of the proposed electrochemical method as compared to earlier studies on viologen-Cyclodextrin systems.

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Acknowledgments

Shaz Akber is thankful to Dr. M Tariq and Dr. Lubna Naz, ICCBS Karachi University for their useful suggestions and help in connection with the digital simulation.

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Authors and Affiliations

  1. Department of Chemistry, University of Karachi, House No. 4, Street No. 1, Area 2/A, Landhi No. 3, Karachi, 75160, Pakistan

    Shazia Akbar

  2. Department of Chemistry, Jinnah University for Women, Karachi, Pakistan

    I. I. Naqvi

  3. HEJ Research Institute of Chemistry, ICCBS, University of Karachi, Karachi, Pakistan

    M. Mohammad

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  1. Shazia Akbar
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  2. I. I. Naqvi
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  3. M. Mohammad
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Correspondence to Shazia Akbar.

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Akbar, S., Naqvi, I.I. & Mohammad, M. Electron transfer reactions associated with ethyl viologen-β-cyclodextrin complexation: equilibrium and kinetic aspects. J IRAN CHEM SOC 11, 615–621 (2014). https://doi.org/10.1007/s13738-013-0331-4

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