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Using electronic absorption spectroscopy, and steady-state and time-resolved fluorescence, we studied the singlet state properties of dendro[60]fullerene, a C60 methanoderivative whose addend is a water-soluble dendrimer. Fluorescence quenching, especially by halide ions in water, was characterized at several temperatures. From a new relation for the activation energy of a diffusion-influenced reaction and from a comparison with the quenching in organic solvents, it is concluded that the quenching occurs by the external heavy-atom effect. An efficient photoinduced oxidation of iodide in aerated solutions and in the presence of a fullerene is also reported. The photoinduced oxidation mechanism exclusively involves ground-state oxygen.

the journal of physical chemistry a

Photophysics and Photochemistry of a Water-Soluble C<sub>60</sub> Dendrimer: Fluorescence Quenching by Halides and Photoinduced Oxidation of I<sup>-</sup>

Photophysics and Photochemistry of a Water-Soluble C60 Dendrimer: Fluorescence Quenching by Halides and Photoinduced Oxidation of I-

Photophysics and Photochemistry of a Water-Soluble C₆₀ Dendrimer: Fluorescence Quenching by Halides and Photoinduced Oxidation of I^-