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DOI: 10.1039/A808540D (Paper) Reference Section for: J. Chem. Soc., Perkin Trans. 2, 1999, 505-514

Electron acceptors of the fluorene series. Part 8.1 Electrochemical and intramolecular charge transfer studies of thiophene functionalised fluorenes

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Peter J. Skabara, Igor M. Serebryakov and Igor F. Perepichka

Abstract

The degree of intramolecular charge transfer (ICT) in 9-(1,3-dithiol-2-ylidene)fluorenes bearing fused thiophene and 2,5-dihydrothiophene units (2 and 16, respectively), has been investigated by UV-VIS spectroscopy. Both series of compounds show a good correlation between the ICT energies and Σσp– values of the corresponding molecules. The sensitivity parameters ρICT– are 0.18 eV for 2 and 0.16 eV for 16. Cyclic voltammetry of both series, 2 and 16, reveals a single irreversible oxidation process in all compounds. However, electropolymerisation under oxidative conditions does not take place, since the radical cation intermediate is most probably derived from the electroactivity of the 1,3-dithiole–fluorene fragment. In parallel to ICT, the values of E1red½ and E2red½ in relevant compounds also show a linear relationship with σp– constants in the fluorene ring. The sensitivity parameters for series 2 are 0.20 V (ρ1red–) and 0.17 V (ρ2red–), whilst those for 16 are 0.26 V (ρ1red–) and 0.18 V (ρ2red–).

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