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A broadband visible light-absorbing [ 70 ]fullerene-BODIPY-triphenylamine triad ( C 70 -B-T ) has been synthesized and applied as a heavy atom-free organic triplet photosensitizer for photooxidation. By attaching two triphenylmethyl amine units (TPAs) to the π-core of BODIPY via ethynyl linkers, the absorption range of the antenna is extended to 700 nm with a peak at 600 nm. Thus, the absorption spectrum of C 70 -B-T almost covers the entire UV-visible region (270-700 nm). The photophysical processes are investigated by means of steady-state and transient spectroscopies. Upon photoexcitation at 339 nm, an efficient energy transfer (ET) from TPA to BODIPY occurs both in C 70 -B-T and B-T , resulting in the appearance of the BODIPY emission at 664 nm. Direct or indirect (via ET) excitation of the BODIPY-part of C 70 -B-T is followed by photoinduced ET from the antenna to C 70 , thus the singlet excited state of C 70 ( 1 C 70  * ) is populated. Subsequently, the triplet excited state of C 70 ( 3 C 70  * ) is produced via the intrinsic intersystem crossing of C 70 . The photooxidation ability of C 70 -B-T was studied using 1,5-dihydroxy naphthalene (DHN) as a chemical sensor. The photooxidation efficiency of C 70 -B-T is higher than that of the individual components of C 70 -1 and B-T , and even higher than that of methylene blue (MB). The photooxidation rate constant of C 70 -B-T is 1.47 and 1.51 times as that of C 70 -1 and MB, respectively. The results indicate that the C 70 -antenna systems can be used as another structure motif for a heavy atom-free organic triplet photosensitizer.

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Broadband Visible Light-Absorbing [70]Fullerene-BODIPY-Triphenylamine Triad: Synthesis and Application as Heavy Atom-Free Organic Triplet Photosensitizer for Photooxidation