J. Phys. IV France 114 (2004) 509
Intramolecular electron transfer mediated by a tetrathiafulvalene (TTF) bridgeP. Hudhomme1, 1, F. Dumur1, N. Gautier1, A. Gorgues1, V. Lloveras2, J. Vidal-Gancedo2, J. Veciana2, J. Veciana2 and C. Rovira2
1 Laboratoire Ingénierie Moléculaire et Matériaux Organiques, UMR CNRS 6501, 2 Bd. Lavoisier, 49045 Angers, France
2 Institut de Ciència de Materials de Barcelona (CSIC), Campus Universitari de Bellaterra, 08193 Cerdanyola, Spain
Unprecedented fused acceptor-donor-acceptor triad (Q-TTF-Q) incorporating the donor tetrathiafulvalene (TTF) and the acceptor p-benzoquinone (Q) has been synthesized. The solution UV-Vis spectrum displays a low energy absorption band which is attributed to an intramolecular charge transfer between both antagonistic units. The presence of reversible oxidation and reduction waves for the donor and acceptor moieties was in agreement with the ratio TTF/quinones units. The monoradical anion Q-TTF-Q -. was generated upon chemical reduction and monitored by ESR spectroscopy. This was demonstrated as a Class II mixed valence system with the existence of a temperature dependent intramolecular electron transfer. Key words. Electron transfer - Tetrathiafulvalene - Quinone.
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