Long-Lived Photoproduced Radical Ions in Tetrathiafulvalenes Covalently Tethered to C60 Научная публикация
Журнал |
Journal of the Chemical Society. Perkin Transactions 2 (up to 2002)
ISSN: 0300-9580 |
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Вых. Данные | Год: 1999, Номер: 3, Страницы: 657-665 Страниц : 9 DOI: 10.1039/A803737J | ||||||||||
Ключевые слова | PHOTOINDUCED ELECTRON-TRANSFER; BUCKMINSTERFULLERENE C-60; INTRAMOLECULAR ELECTRON; CYCLIC VOLTAMMETRY; CONDUCTING POLYMER; CHARGE SEPARATION; SPIN-RESONANCE; DONOR; FULLERENES; PHOTOSYNTHESIS | ||||||||||
Авторы |
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Организации |
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Реферат:
C60, or [60]fullerene, a reversible one- to six-electron acceptor with moderate first electron affinity, was covalently linked, via a 1,3-dipolar addition reaction using azomethine ylides and two flexible insulating σ-chains of different lengths, to a tetrathioalkyltetrathiafulvalene, a reversible one- to two-electron donor with low first ionization potential, yielding molecules 1 and 2. The electrochemical oxidation and reduction waves are the same as those of the separate components; UV-VIS spectra indicate no appreciable charge transfer in the ground state between the donor and acceptor moieties of these D-σ-A systems 1 and 2: there is only a weak shoulder at 800 nm (ε ≈ 200 L mol-1 cm-1), which could be the intervalence transfer band. These same molecules, as well as their donor and acceptor components taken separately, were electrochemically oxidized/reduced in liquid solutions, and also irradiated with laser light in low-temperature glasses. The electron paramagnetic resonance (EPR) spectra revealed photoexcited electron transfer at 77 K, with resulting S = 1/2 radical cation and radical anion states. In a glass at 77 K these radical signals survive a long time (up to several days) after the end of light irradiation. This may be separately solvated pairs of long-lived radicals D.+-σ-A and D-σ-A.- or, less likely, a long-lived excited-state zwitterionic biradical D.+-σ-A.-. With increasing temperature and the onset of diffusional motion, the EPR signals disappear.
Библиографическая ссылка:
Simonsen K.B.
, Konovalov V.V.
, Konovalova T.A.
, Kawai T.
, Cava M.
, Kispert L.D.
, Metzger R.M.
, Becher J.
Long-Lived Photoproduced Radical Ions in Tetrathiafulvalenes Covalently Tethered to C60
Journal of the Chemical Society. Perkin Transactions 2 (up to 2002). 1999. N3. P.657-665. DOI: 10.1039/A803737J WOS Scopus РИНЦ
Long-Lived Photoproduced Radical Ions in Tetrathiafulvalenes Covalently Tethered to C60
Journal of the Chemical Society. Perkin Transactions 2 (up to 2002). 1999. N3. P.657-665. DOI: 10.1039/A803737J WOS Scopus РИНЦ
Даты:
Поступила в редакцию: | 17 мая 1998 г. |
Принята к публикации: | 16 дек. 1998 г. |
Опубликована в печати: | 1 мар. 1999 г. |
Идентификаторы БД:
Web of science | WOS:000079319300034 |
Scopus | 2-s2.0-0001323127 |
РИНЦ | 13306198 |
Chemical Abstracts | 1999:136475 |
Chemical Abstracts (print) | 130:337764 |
OpenAlex | W2162799115 |