Publication
549
Chem.
Mater., 14 (1), 392 -400, 2002
DOI: 10.1021/cm011212d S0897-4756(01
) 01212-1 |
|
|
The Electrochemical Reduction of Diazonium
Salts on Iron Electrodes. The Formation of
Covalently Bonded Organic Layers and Their
Effect on Corrosion
|
Annie Chaussé, Mohamed
M. Chehimi, Nadia Karsi, Jean
Pinson, Fetah Podvorica, and Christine
Vautrin-Ul
Laboratoire d'Electrochimie Moléculaire
de l'Université Paris 7, Unité Mixte
de Recherche Université-CNRS N° 7591.
Université Paris7-Denis Diderot, 2 Place
Jussieu, F-75251, Paris Cedex 05, France, Laboratoire
Analyse et Environnement de l'Université Evry
- Val d'Essonne, Unité Mixte de Recherche
Université-CNRS-CEA N° 8587, Université d'Evry,
Rue du Père Jarland, 91025 Evry, France,
and ITODYS, Université Paris 7-Denis Diderot,
Associé au CNRS (UPRESA 7086), 1 rue Guy
de la Brosse, F-75005 Paris, France
Electrochemical reduction of aryldiazonium salts
on an iron electrode in acetonitrile leads to the
attachment of aryl groups to the iron surface.
We investigated aryl groups substituted with 4-alkyl
chains (-CH3, -C4H9,
-C12H25, -OC12H25,
-OC16H33), with 4-halogeno
substituents (-I, -F, -CF3, -OCF3,
or -C6F13), or with five
fluorine atoms (pentafluoro phenyl, -C6F5).
Attachment of these groups was characterized by
FTIR, XPS, and capacity measurements. It is shown
by measuring the polarization resistance and the
corrosion current that these layers provide a significant
protection against corrosion. |
