Photoinduced electroreduction of chlorophyllide on alkanethiol-coated mercury.
J Am Chem Soc
; 127(7): 2231-7, 2005 Feb 23.
Article
em En
| MEDLINE
| ID: mdl-15713101
ABSTRACT
Monolayers of n-alkanethiols of chain length from C12 to C18 were self-assembled on a hanging mercury drop electrode, and a film of chlorophyllide (Chlide) was adsorbed on top of them. The reduction photocurrents following illumination of the Chlide film were measured over the potential range in which the Chlide is electroinactive in the dark, and their action spectra were determined. Plotting the derivative of the photocurrents with respect to the applied potential against potential yields bell-shaped curves that can be fitted to a Gaussian. The potential of the Gaussian maximum was used to determine the reorganization energy lambda for the Chlide electroreduction process. An increase in the thiol chain length causes lambda to decrease regularly and the photocurrent to decay exponentially with the monolayer thickness, with a decay constant beta of about 0.17 A(-1).
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Compostos de Sulfidrila
/
Clorofilídeos
/
Mercúrio
Idioma:
En
Revista:
J Am Chem Soc
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
Itália