Nearly 30 years after theoretical prediction, a stable and well-characterized compound that covalently links tetrathiafulvalene and tetracyanoquinodimethane fragments has been synthesized (1, see scheme). The extremely low HOMO–LUMO gap of 1 (0.17 eV) allows the first observation of thermoexcited electron transfer in a donor–acceptor diad. Langmuir–Blodgett films of 1 are not electrically conducting.
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Perepichka et al. (2003) studied this question.
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