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Solution phase electron transfer versus bridge mediated electron transfer across carboxylic acid terminated thiols

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Abstract

Self-assembled monolayers (SAMs) of thiols with carboxylic acid terminal groups were formed on gold substrates. The electron transfer characteristics of redox species on the above SAM-modified electrodes were studied in acid and neutral media with the help of voltammetry under two different conditions: (1) solution phase electron transfer and (2) bridge mediated electron transfer. Two redox systems, viz., [Fe(CN)6]4-/3− and Ru[(NH3)6]2+/3+ were chosen for the solution phase study. Investigations of bridge mediated electron transfer were carried out by functionalising the SAM with redox moieties and then studying their redox behaviour. For this study, ferrocene carboxylic acid and 1,4-diamino anthraquinone were used and they were linked to carboxylic acid terminated thiols by covalent linkage. The voltammetric results with mercaptoundecanoic acid SAM demonstrate the difference in behaviour between solution phase and bridge mediated electron transfer processes.

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Acknowledgements

The DRDO, New Delhi is gratefully acknowledged for financial support.

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Authors and Affiliations

  1. Central Electrochemical Research Institute, Karaikudi, 630006, India

    Sheela Berchmans, R. G. Nirmal, G. Prabaharan & V. Yegnaraman

  2. Institute of Mathematical Sciences, Chennai, 600113, India

    A. K. Mishra

Authors
  1. Sheela Berchmans
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  2. R. G. Nirmal
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  3. G. Prabaharan
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  4. A. K. Mishra
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  5. V. Yegnaraman
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Correspondence to V. Yegnaraman.

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Berchmans, S., Nirmal, R.G., Prabaharan, G. et al. Solution phase electron transfer versus bridge mediated electron transfer across carboxylic acid terminated thiols. J Solid State Electrochem 10, 439–446 (2006). https://doi.org/10.1007/s10008-005-0011-0

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  • DOI: https://doi.org/10.1007/s10008-005-0011-0

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