INVESTIGADORES
CALVO Ernesto Julio
artículos
Título:
Some Evidence for the Formation of an Azo Bond during the Electroreduction of Diazonium Salts on Au Substrates
Autor/es:
CALVO, E.J.; ALEJANDRA M. RICCI; MENDEZ DE LEO, LUCILA; WILLIAMS, F.J.
Revista:
Chemphyschem
Editorial:
WILEY-V C H VERLAG GMBH
Referencias:
Lugar: Weinheim; Año: 2012 vol. 13 p. 1 - 7
ISSN:
1439-4235
Resumen:
Molecular films obtained by electrochemical reduction of diazoniuim
tetrafluoroborate salts [4-carboxybenzene (PhCOOH)
and 4-amino-(2,3,5,6-tetrafluoro)-carboxybenzene (PhF4COOH)]
on Au substrates and post-functionalization with an osmium
pyridil-bipyridine complex are studied by a combination of Xray
photoelectron (XPS) and polarization-modulation infrared
reflection absorption spectroscopy (PM-IRRAS). The spectroscopic
evidence suggests the formation of N=N bonds tethering
the complexes to Au. The surface coverage of the azobonded
osmium complexes strongly depends on the electrode
potential. The resulting tethered osmium redox centres were
characterized by cyclic voltammetry and impedance spectroscopy.
Similar electron transfer-rate constants were measured
for both fluorinated and non fluorinated benzene-linked Os
complexes.4COOH)]
on Au substrates and post-functionalization with an osmium
pyridil-bipyridine complex are studied by a combination of Xray
photoelectron (XPS) and polarization-modulation infrared
reflection absorption spectroscopy (PM-IRRAS). The spectroscopic
evidence suggests the formation of N=N bonds tethering
the complexes to Au. The surface coverage of the azobonded
osmium complexes strongly depends on the electrode
potential. The resulting tethered osmium redox centres were
characterized by cyclic voltammetry and impedance spectroscopy.
Similar electron transfer-rate constants were measured
for both fluorinated and non fluorinated benzene-linked Os
complexes.=N bonds tethering
the complexes to Au. The surface coverage of the azobonded
osmium complexes strongly depends on the electrode
potential. The resulting tethered osmium redox centres were
characterized by cyclic voltammetry and impedance spectroscopy.
Similar electron transfer-rate constants were measured
for both fluorinated and non fluorinated benzene-linked Os
complexes.