Preparation and Properties of a Polycyclic p-Quinodimethane with Two Oxygen Bridges and its Radical Cation in Comparison with the Isomeric o-Quinodimethane

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We prepared an electron-rich p-quinodimethane compound, 2,9-dibromo-7,14-dimesityl-5,12-dioxapentacene (1). The quinoidal character was clarified by bond-length alternation in the central ring. Clear vibrational structures in both absorption and emission bands and small Stokes shift indicate the rigid dioxapentacene framework....

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