title: Tetrathiafulvalene-benzothiadiazoles as redox-tunable donor-acceptor systems: synthesis and photophysical study.
abstract: Electrochemical and photophysical analysis of new donor-acceptor systems 2 and 3, in which a benzothiadiazole (BTD) unit is covalently linked to a tetrathiafulvalene (TTF) core, have verified that the lowest excited state can be ascribed to an intramolecular-charge-transfer (ICT) π(TTF)→π*(benzothiadiazole) transition. Owing to better overlap of the HOMO and LUMO in the fused scaffold of compound 3, the intensity of the (1)ICT band is substantially higher compared to that in compound 2. The corresponding CT fluorescence is also observed in both cases. The radical cation TTF(+·) is easily observed through chemical and electrochemical oxidation by performing steady-state absorption experiments. Interestingly, compound 2 is photo-oxidized under aerobic conditions.
authors.affiliation: LUNAM Université, CNRS UMR 6200, Laboratoire MOLTECH-Anjou, 2 bd Lavoisier, 49045 Angers, France.
authors.forename: Flavia
authors.initials: F
authors.lastname: Pop
authors.forename: Anneliese
authors.initials: A
authors.lastname: Amacher
authors.forename: Narcis
authors.initials: N
authors.lastname: Avarvari
authors.forename: Jie
authors.initials: J
authors.lastname: Ding
authors.forename: Latevi Max Lawson
authors.initials: LM
authors.lastname: Daku
authors.forename: Andreas
authors.initials: A
authors.lastname: Hauser
authors.forename: Marius
authors.initials: M
authors.lastname: Koch
authors.forename: Jürg
authors.initials: J
authors.lastname: Hauser
authors.forename: Shi-Xia
authors.initials: SX
authors.lastname: Liu
authors.forename: Silvio
authors.initials: S
authors.lastname: Decurtins