TR-EPR of single and double spin labelled C60derivatives: observation of quartet and quintet excited states in solution
| العنوان: | TR-EPR of single and double spin labelled C60derivatives: observation of quartet and quintet excited states in solution |
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| المؤلفون: | Valentina P. Gubskaya, I. A. Nuretdinov, Lorenzo Franco, Carlo Corvaja, Martina Mazzoni, L. Sh. Berezhnaya |
| المصدر: | Molecular Physics. 104:1543-1550 |
| بيانات النشر: | Informa UK Limited, 2006. |
| سنة النشر: | 2006 |
| مصطلحات موضوعية: | Nitroxide mediated radical polymerization, Spin polarization, Chemistry, Radical, Nitroxide, Biophysics, Condensed Matter Physics, Photochemistry, law.invention, Photoexcitation, Fullerene, law, EPR spectroscopy, Excited state, Physics::Chemical Physics, Physical and Theoretical Chemistry, Triplet state, Atomic physics, Spin (physics), Electron paramagnetic resonance, Molecular Biology |
| الوصف: | Time-resolved EPR spectra recorded after pulsed laser photoexcitation of two fullerene nitroxide radicals 1a and 1b and two fullerene nitroxide biradicals 2a and 2b in solution have been investigated at room temperature. The TR-EPR spectra of all the radicals are interpreted as arising from spin-polarized ground and excited states, the latter being obtained by the spin coupling of the nitroxide unpaired spins with the fullerene excited triplet state. The TR-EPR spectra of the monoradicals are consistent with strong (1a) or weak (1b) spin coupling, giving rise to pure quartet/doublet excited states (1a) or mixed states (1b). In the latter, the spectral simulation allowed the determination of the magnitude of the exchange coupling constant J TR between the triplet and the radical. The spin polarization of the excited and ground states is attributed to CIDEP effect induced by the radical triplet pair mechanism (RTPM). The sign of J TR is inferred from the sign of the spin polarization. In the case of biradic... |
| تدمد: | 1362-3028 0026-8976 |
| DOI: | 10.1080/00268970600577614 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b103404b015e95a06c9a647c443b4d1d https://doi.org/10.1080/00268970600577614 |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi.dedup.....b103404b015e95a06c9a647c443b4d1d |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13623028 00268976 |
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| DOI: | 10.1080/00268970600577614 |