Isolated large ¦Ð systems in pyrene-fluorene derivatives for intramolecular through-space interaction in organic semiconductors

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• 作者：Chao Tang^a ; ¹ ; ^{iamctang@njupt.edu.cn} ; Hui Xu^a ; ¹ ; Feng Liu^a ; ^b ; Yi-Jie Xia^b ; Wei Huang^a ; ^{wei-huang@njupt.edu.cn}
• 关键词：Organic semiconductors ; Intramolecular through-space interaction ; ¦Ð &ndash ; ¦Ð hyperconjugation ; Pyrene&ndash ; fluorene ; Isolated ¦Ð systems
• 刊名：Organic Electronics
• 出版年：2013
• 出版时间：March, 2013
• 年：2013
• 卷：14
• 期：3
• 页码：782-789
• 全文大小：634 K

文摘

In order to give an insight of the special spectra of isolated ¦Ð systems, a series of pyrene-fluorene derivatives, with conjugated or non-conjugated pyrene groups, were systematically studied. Besides absorption of non-conjugated pyrene itself and main conjugation chain, all the pyrene-non-conjugated large conjugated materials show a characteristic sharp absorption peak at ¡«352 nm. Through systematical investigation, this special absorption peak was attributed to the intramolecular through-space interaction between the two isolated large ¦Ð systems. Such interaction could also be defined as ¦Ð - ¦Ð hyperconjugation. And from quantum calculation, this intramolecular interaction does shorten the length of single bond. Through systematical research, the condition of this intramolecular through-space interaction is proved to be that the non-conjugated pyrene must have projection on fluorene plane. And then this effect is applied to explain the improved injection ability of the materials by bringing out one simple hopping model.