蟺-Extended Thiadiazoles Fused with Thienopyrrole or Indole Moieties: Synthesis, Structures, and Properties

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• 作者：Shin-ichiro Kato ; Takayuki Furuya ; Atsushi Kobayashi ; Masashi Nitani ; Yutaka Ie ; Yoshio Aso ; Toshitada Yoshihara ; Seiji Tobita ; Yosuke Nakamura
• 刊名：The Journal of Organic Chemistry
• 出版年：2012
• 出版时间：September 7, 2012
• 年：2012
• 卷：77
• 期：17
• 页码：7595-7606
• 全文大小：607K
• 年卷期：v.77,no.17(September 7, 2012)
• ISSN：1520-6904

文摘

We report the syntheses, structures, photophysical properties, and redox characteristics of donor鈥揳cceptor-fused 蟺-systems, namely 蟺-extended thiadiazoles 1鈥?b>5 fused with thienopyrrole or indole moieties. They were synthesized by the Stille coupling reactions followed by the PPh₃-mediated reductive cyclizations as key steps. X-Ray crystallographic studies showed that isomeric 1b and 2b form significantly different packing from each other, and 1a and 4a afford supramolecular networks via multiple hydrogen bonding with water molecules. Thienopyrrole-fused compounds 1b and 2b displayed bathochromically shifted intramolecular charge-transfer (CT) bands and low oxidation potentials as compared to indole-fused analog 3b and showed moderate to good fluorescence quantum yields (桅_f) up to 0.73. In 3b鈥?b>5b, the introduction of electron-donating substituents in the indole moieties substantially shifts the intramolecular CT absorption maxima bathochromically and leads to the elevation of the HOMO levels. The 桅_f values of 3鈥?b>5 (0.04鈥?.50) were found to be significantly dependent on the substituents in the indole moieties. The OFET properties with 1b and 2b as an active layer were also disclosed.