Synthesis and characterization of new helically chiral heptacyclic systems

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• 作者：Mourad Ben Braiek ; Faouzi Aloui ; Souad Moussa ; Bé ; chir Ben Hassine ; ^{bechirbenhassine@yahoo.fr" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Helicenes ; Heck coupling ; Photocyclization ; Optical properties ; Visible emission
• 刊名：Tetrahedron Letters
• 出版年：2015
• 出版时间：25 November 2015
• 年：2015
• 卷：56
• 期：47
• 页码：6580-6584
• 全文大小：778 K

文摘

New helically chiral heptacyclic systems with cyano groups at selected positions have been synthesized in good yields, via a four-step sequence, from readily available materials. The optical properties of the target helicenes were investigated by UV–visible absorption and photoluminescence spectroscopy and an emission in the visible region was observed. The energy levels of these organic materials were determined by cyclic voltammetry and showed a relatively high electronic affinity, indicating that they may be good candidates for electron-injection hole blocking layer in organic light-emitting diodes.