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Article Dans Une Revue Journal of electroanalytical chemistry and interfacial electrochemistry Année : 2006

Direct versus indirect electron transfers in host-guest-inclusion complexes: Example of the oxidation of TTF-β-CD complexes

Résumé

The possibility of homogeneous electron transfers besides the heterogeneous transfers into host-guest electroactive systems have been examined in details with the case of a simple system: the TTF oxidation in water in presence of a cyclodextrin. The global mechanism can be described by a classical CE mechanism taking into account the existence of fast homogeneous electron transfers. It appears that the guest-host complex between the TTF and the cyclodextrin is efficiently oxidised in solution through a homogeneous pathway without prior to dissociation, the dication playing a role of catalyst able to access in the cavity. Contrarily to the generally reported behaviour for host-guest complexes, the direct electron transfer to the guest molecule is also possible even if its kinetics is relatively slow (ks,app in the 10−3 cm s−1 range).

Dates et versions

hal-00189934 , version 1 (22-11-2007)

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Citer

Jean-François Bergamini, Philippe Hapiot, Dominique Lorcy. Direct versus indirect electron transfers in host-guest-inclusion complexes: Example of the oxidation of TTF-β-CD complexes. Journal of electroanalytical chemistry and interfacial electrochemistry, 2006, 593 (1-2), pp.87-98. ⟨10.1016/j.jelechem.2006.03.013⟩. ⟨hal-00189934⟩
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