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Adsorption of Depocolin and Dimegin on Nickel from Neutral Aqueous Solutions

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Abstract

Electrochemical and adsorption behavior of porphyrin derivatives—dimegin and depocolin—on the surface of nickel from aqueous borate buffer solution with рН 7.4 have been studied. Both porphyrins shifted the pitting formation potential positively. According to the ellipsometric and XPS data, the porphyrins’ adsorption layer thicknesses were nearly equal and amounted to 0.6–0.8 nm, which corresponded to the molecule position at an angle of ~45° to the surface. Molecules are bound to the nickel surface by the oxygen atoms of carboxyl groups, whereas the porphyrin ring was not involved in the bond formation with nickel.

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ACKNOWLEDGEMENTS

This work was supported by the Russian Foundation for Basic Research, project no. 16-03-0646а.

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Authors and Affiliations

  1. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071, Moscow, Russia

    O. Yu. Grafov, M. O. Agafonkina, N. P. Andreeva, L. P. Kazanskii & Yu. I. Kuznetsov

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  1. O. Yu. Grafov
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  2. M. O. Agafonkina
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  3. N. P. Andreeva
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  4. L. P. Kazanskii
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  5. Yu. I. Kuznetsov
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Correspondence to Yu. I. Kuznetsov.

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Translated by D. Marinin

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Grafov, O.Y., Agafonkina, M.O., Andreeva, N.P. et al. Adsorption of Depocolin and Dimegin on Nickel from Neutral Aqueous Solutions. Prot Met Phys Chem Surf 55, 1304–1310 (2019). https://doi.org/10.1134/S2070205119070074

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  • DOI: https://doi.org/10.1134/S2070205119070074

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