An Ultra‐Long‐Lived Triplet Excited State in Water at Room Temperature: Insights on the Molecular Design of Tridecafullerenes

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Ramos Soriano, Javier and Pérez Sánchez, Alfonso and Ramírez Barroso, Sergio and Illescas, Beatriz M. and Azmani, Khalid and Rodríguez Fortea, Antonio and Poblet, Josep M. and Hally, Cormac and Nonell, Santi and García Fresnadillo, David and Rojo, Javier and Martín León, Nazario (2021) An Ultra‐Long‐Lived Triplet Excited State in Water at Room Temperature: Insights on the Molecular Design of Tridecafullerenes. Angewandte Chemie International Edition, 60 (29). pp. 16109-16118. ISSN 1433-7851

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Official URL: https://doi.org/10.1002/anie.202104223



Abstract

Suitably engineered molecular systems exhibiting triplet excited states with very long lifetimes are important for high-end applications in nonlinear optics, photocatalysis, or biomedicine. We report the finding of an ultra-long-lived triplet state with a mean lifetime of 93 ms in an aqueous phase at room temperature, measured for a globular tridecafullerene with a highly compact glycodendrimeric structure. A series of three tridecafullerenes bearing different glycodendrons and spacers to the C60 units have been synthesized and characterized. UV/Vis spectra and DLS experiments confirm their aggregation in water. Steady-state and time-resolved fluorescence experiments suggest a different degree of inner solvation of the multifullerenes depending on their molecular design. Efficient quenching of the triplet states by O2 but not by waterborne azide anions has been observed. Molecular modelling reveals dissimilar access of the aqueous phase to the internal structure of the tridecafullerenes, differently shielded by the glycodendrimeric shell.


Item Type:Article
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CRUE-CSIC (Acuerdos Transformativos 2021)

Uncontrolled Keywords:fullerenes; glycoconjugates; photochemistry; triplet lifetime; triplet quenching
Subjects:Sciences > Chemistry > Chemistry, Organic
ID Code:70674
Deposited On:23 Feb 2022 12:17
Last Modified:23 Feb 2022 12:50

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