A Concise and Efficient Route to Electron-Accepting 2,2′-[2,2′-Arenediylbis(11-oxoanthra[1,2-<i>b</i>]thiophene-6-ylidene)]dipropanedinitriles
作者:Denis S. Baranov、Mikhail N. Uvarov、Maxim S. Kazantsev、Evgeni M. Glebov、Danil A. Nevostruev、Evgeny A. Mostovich、Olga V. Antonova、Leonid V. Kulik
DOI:10.1002/ejoc.201800275
日期:2018.5.24
A concise organolithium‐free route to build electron‐accepting molecules consisting of two 2‐(11‐oxoanthra[1,2‐b]thiophen‐6‐ylidene)propanedinitrile units connected by functionalized π‐conjugated linkers was developed. Annulation of two thiophene rings in one step was achieved through chemoselective cyclocondensation of a bis(ethynylanthraquinone) substrate with sodium sulfide. Finally, electron‐accepting dicyanomethylene moieties were introduced by Knoevenagel condensation with malodinitrile. The synthesized 2,2′‐[2,2′‐arenediylbis(11‐oxoanthra[1,2‐b]thiophene‐6‐ylidene)]dipropanedinitriles were studied by UV/Vis and fluorescence spectroscopy, cyclic voltammetry, and DFT calculations. The acceptor properties of these compounds were confirmed by efficient light‐induced electron transfer in their blend with a donor polymer, poly(3‐hexylthiophene‐2,5‐diyl), detected by electron paramagnetic resonance spectroscopy.