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Abstract
Multistage organic redox systems,[1] in particular, electrochemically highly amphoteric compounds with a small
HOMO/LUMO gap (HLG, for example, EoxEred<0.5 eV),
are of current interest due to their potential applications in molecular electronics and optoelectronics.[2] Consequently,research efforts have been directed toward the design and synthesis of molecular systems composed of powerful electron donor (D) and acceptor (A) units. However, any strong electronic interaction in such molecules renders them neither strong electron donors nor acceptors. In practice, therefore,
D and A components are often covalently linked by saturated
flexible or rigid s spacers (D-s-A). Thereby, the
structural D and A moieties on which the HOMO and
LUMO are localized, respectively, are kept apart from each
other. This hinders their strong coupling in the electronic
ground state, so as to keep the HLG small.[3] Conjugated
bridges of D-p-A assemblies, although providing easier
steric control, generally favor stronger electronic coupling. Besides the amphoteric ground-state properties, photoinduced intramolecular charge-transfer (CT) processes may result in interesting photophysical phenomena such as longlived,charge-separated states.
Original language | English |
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Pages (from-to) | 63-66 |
Number of pages | 3 |
Journal | Chemistry - A European Journal |
Volume | 15 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2009 |
Keywords
- charge transfer
- donor-acceptor systems
- HOMO-LUMO gap
- redox chemistry
- tetrathiafulvalenes
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Projects
- 2 Finished