Electron Acceptors Based on Cyclopentannulated Anthanthrenes
2020
We demonstrate the preparation of anthanthrene derivatives with fused five-membered rings. These new derivatives are prepared by a palladium catalyzed cyclopentannulation reaction from precursors derived from the low-cost dye Vat Orange 3 (4,10-dibromoanthanthrone). The new cyclopenta-anthanthrene compounds possess reduced optical and electrochemical gaps (~0.9 eV) compared to anthanthrene derivatives and are electron acceptors with lowest unoccupied molecular orbital energies of ~ -3.4 eV to -3.9 eV.
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