Endohedral metallofullerenes - filled fullerene derivatives toward multifunctional reaction center mimics
Physical Chemistry of Molecules, Liquids and Interfaces, Biophysical Chemistry
Final Report Abstract
Our earlier starting point was the reduction of endohedral metallofullerenes in electron-donor acceptor systems; a reactivity pathway similar to that established for fullerenes. As a complement, we demonstrated in a few cases that endohedral metallofullerenes also act as electron donors, namely undergoing one-electron oxidation, when combined with strong electron acceptors. A direct comparison between these two opposing pathways was, however, impeded by the fact that too many parameters were changed at the same time; electron donor/acceptor strength, electron-donor acceptor distance, excited state energy, reorganization energy, to name just a few. To this end, the first milestone of the current project was to limit the variables to just one, that is, the electron donor/acceptor strength in a series of phthalocyanines. This turned out to be essential in terms of either photo-oxidizing or -reducing Sc3N@Ih-C80 as a representative case for endohedral metallofullerenes. The second milestone was to take that concept further and focus on electron deficient subphthalocyanines to photo-oxidize endohedral metallofullerenes such as La2@C80. As a matter of fact, the oxidizing power of these electron deficient subphthalocyanines was so high that it enabled the third milestone, that is, for the first time the photo-oxidation of empty fullerenes. All of the aforementioned set the stage for the fourth milestone that is photo-oxidation of endohedral metallofullerenes and photoreduction of empty fullerenes in one and the same electron-donor acceptor system: We designed, synthesized, and probed a Lu3N@Ih-C80-C60 electron-donor acceptor system and demonstrated that the presence of Lu3N facilitatest triplet radical ion state formation and that that this triplet radical ion state is longer-lived by nearly two orders of magnitude when compared to the corresponding singlet radical ion state.
Publications
- (2019) All-Fullerene Electron Donor-Acceptor Conjugates. Angewandte Chemie (International ed. in English) 58 (21) 6932–6937
Izquierdo, Marta; Platzer, Benedikt; Stasyuk, Anton J.; Stasyuk, Olga A.; Voityuk, Alexander A.; Cuesta, Sergio; Solà, Miquel; Guldi, Dirk M.; Martín, Nazario
(See online at https://doi.org/10.1002/anie.201901863) - Chem. Comm. 2015, 41, 330
L. Feng, M. Rudolf, O. Trukhina, Z. Slanina, F. Uhlik, X. Lu, T. Torres, D.M. Guldi, T. Akasaka
(See online at https://doi.org/10.1039/c4cc08072f) - Chem. Eur. J. 2015, 21, 746
B. Liu, H. Fang, X. Li, W. Cai, L. Bao, M. Rudolf, F. Plass, L. Fan, X. Lu, D.M. Guldi
(See online at https://doi.org/10.1002/chem.201405572) - Chem. Sci. 2015, 6, 4141
M. Rudolf, O. Trukhina, J. Perles, L. Feng, T. Akasaka, T. Torres, D.M. Guldi
(See online at https://doi.org/10.1039/c5sc00223k) - J. Am. Chem. Soc. 2015, 137, 12914
O. Trukhina, M. Rudolf, G. Bottari, T. Akasaka, L. Echegoyen, T. Torres, D.M. Guldi
(See online at https://doi.org/10.1021/jacs.5b06454) - Chem. Soc. Rev. 2016, 45, 612
M. Rudolf, S.V. Kirner, D.M. Guldi
(See online at https://doi.org/10.1039/c5cs00774g)
