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Electron transfer at Au surfaces modified by Tethered Osmium bipyridine–pyridine complexes

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Abstract

Chemically modified electrodes by the osmium complex \( {\left[ {{\text{Os}}{\left( {{\text{bpy}}} \right)}_{2} {\text{Clpy}} - X} \right]}^{ + } {\text{PF}}^{ - }_{6} \) tethered to Au surfaces by (1) reaction of cysteamine with the aldehyde (X=CHO), (2) mercapto alkanoic acid reaction with amine [X=(CH2)2NH2], and (3) reduction of the diazonium salt of p-aminobenzoic acid and further amidation reaction with the amine derivative of the osmium complex [X=(CH2)2NH2] were performed to explore the electron transfer properties of these redox-modified surfaces. The modified Au surfaces were characterized by infrared reflection absorption spectroscopy and resonant Raman spectroscopy. Cyclic voltammetry was used to study the electrochemical properties of the osmium complexes covalently attached to the surface as a function of the type and length of the tether.

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Acknowledgement

The authors wish to dedicate this scientific contribution to the memory of Professor Francisco (Chico) Nart. The authors are grateful to Consejo Nacional de Investigaciones Científicas y Técnicas, University of Buenos Aires, and Agencia Nacional de Promoción Científica y Tecnológica (PICT 06-17170) for financial support. The authors wish to thank Dr. Federico Williams for the XPS measurements and helpful discussions.

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Authors and Affiliations

  1. INQUIMAE. Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, 1428, Buenos Aires, Argentina

    Alejandra Ricci, Claudio Rolli, Silvina Rothacher, Luis Baraldo, Cecilia Bonazzola & Ernesto J. Calvo

  2. Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica, 8400, San Carlos de Bariloche, Argentina

    Nicolas Tognalli & Alex Fainstein

Authors
  1. Alejandra Ricci
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  2. Claudio Rolli
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  3. Silvina Rothacher
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  4. Luis Baraldo
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  5. Cecilia Bonazzola
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  6. Ernesto J. Calvo
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  7. Nicolas Tognalli
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  8. Alex Fainstein
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Correspondence to Ernesto J. Calvo.

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Dedicated to the memory of Professor Francisco (Chico) Nart.

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Ricci, A., Rolli, C., Rothacher, S. et al. Electron transfer at Au surfaces modified by Tethered Osmium bipyridine–pyridine complexes. J Solid State Electrochem 11, 1511–1520 (2007). https://doi.org/10.1007/s10008-007-0339-8

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  • DOI: https://doi.org/10.1007/s10008-007-0339-8

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