A Supramolecular [10]CPP Junction Enables Efficient Electron Transfer in Modular Porphyrin–[10]CPP⊃Fullerene Complexes |
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| Authors: | Youzhi Xu Bingzhe Wang Ramandeep Kaur Martin B. Minameyer Michael Bothe Prof. Dr. Thomas Drewello Prof. Dr. Dirk M. Guldi Prof. Dr. Max von Delius |
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| Affiliation: | 1. Institute of Organic Chemistry and Advanced Materials, University of Ulm, Ulm, Germany;2. Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany |
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| Abstract: | Efficient photoinduced electron transfer was observed across a [10]cycloparaphenylene ([10]CPP) moiety that serves as a rigid non‐covalent bridge between a zinc porphyrin and a range of fullerenes. The preparation of iodo‐[10]CPP is the key to the synthesis of a porphyrin–[10]CPP conjugate, which binds C60, C70, (C60)2, and other fullerenes (KA>105 m ?1). Fluorescence and pump–probe spectroscopy revealed intramolecular energy transfer between CPP and porphyrin and also efficient charge separation between porphyrin and fullerenes, affording up to 0.5 μs lifetime charge‐separated states. The advantage of this approach towards electron donor–acceptor dyads is evident in the case of dumbbell‐shaped (C60)2, which gave intricate charge‐transfer behavior in 1:1 and 2:1 complexes. These results suggest that [10]CPP and its cross‐coupled derivatives could act as supramolecular mediators of charge transport in organic electronic devices. |
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| Keywords: | electron transfer fullerenes host– guest systems strained molecules time-resolved spectroscopy |
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