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Determination of pK a of benzoic acid- and p-aminobenzoic acid-modified platinum surfaces by electrochemical and contact angle measurements

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Abstract

Acidity constant values of benzoic acid (BA)-modified platinum electrode (Pt-BA) and p-aminobenzoic acid (pABA)-modified platinum electrode (Pt-NHBA) surfaces were determined using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and contact angle measurements (CAM). Diazonium tetrafluoroborate salt reduction and pABA oxidation reactions were used to prepare (Pt-BA) and (Pt-NHBA) surfaces, respectively. Both surfaces exhibited pH dependence with [Fe(CN)6]3−/4− redox probe solutions at different pH; this allowed us to estimate the surface pK a values. Acidity constants for Pt-BA surface were found to be pK a (3.09 ± 0.25), (4.89 ± 0.11), and (3.91 ± 0.54) by CV, EIS, and CAM techniques, respectively, while the values for Pt-NHBA surface were pK a (3.16 ± 0.45), (4.24 ± 0.40), and (5.64 ± 0.12). The Pt-BA surface pK a values were lower in CV and CAM measurements relative to the bulk solution of BA, while a higher value was observed in EIS for Pt-BA surface. The pK a values determined for Pt-NHBA surface via both CV and EIS were lower than the bulk value; however, the result obtained from CAM was one unit higher than pK a of bulk pABA.

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  1. Department of Chemistry, Faculty of Science, Ankara University, 06100, Ankarara, Turkey

    Secil Tekin-Celebi & Ali Osman Solak

  2. Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061, USA

    Secil Tekin-Celebi

  3. Department of Chemical Engineering, Kyrgyzstan-Turkiye Manas University, 720044, Bishkek, Kyrgyzstan

    Ali Osman Solak

  4. Department of Chemistry, Faculty of Arts and Sciences, Dumlupınar University, 43270, Kütahyara, Turkey

    Zafer Ustundag

  5. Department of Chemistry, Faculty of Arts and Sciences, Amasya University, 05100, Amasyara, Turkey

    Serkan Demirci

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  1. Secil Tekin-Celebi
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Tekin-Celebi, S., Solak, A.O., Ustundag, Z. et al. Determination of pK a of benzoic acid- and p-aminobenzoic acid-modified platinum surfaces by electrochemical and contact angle measurements. Chem. Pap. 66, 1146–1156 (2012). https://doi.org/10.2478/s11696-012-0237-0

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