C60Fullerene-based materials as singlet oxygen O2(1Δg) photosensitizers: a time-resolved near-IR luminescence and optoacoustic study
Literature Information
Cristina Martí, Santi Nonell, Xiaojun Zhang, Christopher S. Foote, Rafael González Moreno, José L. Bourdelande, Josep Font
The triplet properties of a series of fullerene dihydroderivatives of the o-quinodimethane type and of three representative inclusion complexes with γ-cyclodextrin and calix[8]arenes have been studied. It is found that chemical modification results in a decrease of the singlet oxygen quantum yield relative to C60, with an average ΦΔ = 0.76. On the other hand, encapsulation in either γ-cyclodextrin or calix[8]arene produces greatly varying results depending on host and solvent. Thus, in D2O the γ-cyclodextrin complex of C60 sensitizes O2(1Δg) with ΦΔ = 0.77, while the calixarene complex is totally ineffective, probably due to the occurrence of a fast charge transfer-mediated deactivation process. In CCl4 the calixarene complex acts very much like C60, i.e., ΦΔ = 0.84.
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