Mediating Reductive Charge Shift Reactions in Electron Transport Chains
- Maximilian Wolf ,
- Carmen Villegas ,
- Olga Trukhina ,
- Juan Luis Delgado
- Tomás Torres ,
- Nazario Martín
- Timothy Clark
- Dirk M. Guldi
Abstract

We report the synthesis of a full-fledged family of covalent electron donor–acceptor1–acceptor2 conjugates and their charge-transfer characterization by means of advanced photophysical assays. By virtue of variable excited state energies and electron donor strengths, either Zn(II)Porphyrins or Zn(II)Phthalocyanines were linked to different electron-transport chains featuring pairs of electron accepting fullerenes, that is, C60 and C70. In this way, a fine-tuned redox gradient is established to power a unidirectional, long-range charge transport from the excited-state electron donor via a transient C60•– toward C70•–. This strategy helps minimize energy losses in the reductive, short-range charge shift from C60 to C70. At the forefront of our investigations are excited-state dynamics deduced from femtosecond transient absorption spectroscopic measurements and subsequent computational deconvolution of the transient absorption spectra. These provide evidence for cascades of short-range charge-transfer processes, including reductive charge shift reactions between the two electron-accepting fullerenes, and for kinetics that are influenced by the nature and length of the respective spacer. Of key importance is the postulate of a mediating state in the charge-shift reaction at weak electronic couplings. Our results point to an intimate relationship between triplet–triplet energy transfer and charge transfer.
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