Photocontrolled Synthesis of n-Type Conjugated Polymers |
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Authors: | Eliot F. Woods Alexandra J. Berl Prof. Dr. Julia A. Kalow |
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Affiliation: | Department of Chemistry, Northwestern University, 2145 Sheridan Rd., Evanston, IL, 60208 USA |
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Abstract: | Current approaches to synthesize π-conjugated polymers (CPs) are dominated by thermally driven, transition-metal-mediated reactions. Herein we show that electron-deficient Grignard monomers readily polymerize under visible-light irradiation at room temperature in the absence of a catalyst. The product distribution can be tuned by the wavelength of irradiation based on the absorption of the polymer. Conversion studies are consistent with an uncontrolled chain-growth process; correspondingly, chain extension produces all-conjugated n-type block copolymers. Preliminary results demonstrate that the polymerization can be expanded to donor–acceptor alternating copolymers. We anticipate that this method can serve as a platform to access new architectures of n-type CPs without the need for transition-metal catalysis. |
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Keywords: | Grignard-Verbindungen Konjugierte Polymere Photopolymerisation Übergangsmetallfreie Chemie |
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