Potential Modulation Reflectance of Self-Assembled Naphthoquinone Monolayers on Gold Electrodes

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Abstract

<p>Potential modulation reflectance (PMR) was measured as a function of potential and wavelength of light for self-assembled monolayers (SAMs) formed from dialkyl disulfide-linked naphthoquinones with different spacer alkyl chain on a gold electrode. On the cyclic voltammogram a redox reaction between naphthoquinone and naphtho-hydroquinone in the SAMs is clearly observed. The oxidation and reduction peak currents are strongly dependent on the spacer alkyl chain length. On the PMR spectra two peaks are observed: one at 470 nm wavelength originates from the redox change between the naphthoquinone and naphtho-hydroquinone and the other peak at 530 nm wavelength may be due to formation of a charge transfer complex between naphthoquinone and naphtho-hydroquinone. From the phase retardations of PMR and differential capacitance, it is supposed that relatively slow processes like a configuration change of the naphthoquinone derivative accompanied by proton transfer are included in the redox reaction.</p>

Journal

  • Electrochemistry

    Electrochemistry 67 (12), 1184-1186, 1999-12-05

    The Electrochemical Society of Japan

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