Band Gap Control in Conjugated Oligomers via Lewis Acids

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• 作者：Gregory C. Welch ; Robert Coffin ; Jeff Peet ; Guillermo C. Bazan
• 刊名：Journal of the American Chemical Society
• 出版年：2009
• 出版时间：August 12, 2009
• 年：2009
• 卷：131
• 期：31
• 页码：10802-10803
• 全文大小：154K
• 年卷期：v.131,no.31(August 12, 2009)
• ISSN：1520-5126

文摘

A simple and effective strategy for optical band gap control is demonstrated through the use of a novel small acceptor/donor/acceptor molecule, 1, and group-13 Lewis acids. Chromophore 1 contains a dithienolesilole donor unit end-capped with benzo-2,1,3-thiadiazole (BT) acceptor units. Addition to 1 of stoichiometeric quantities of Lewis acids of varying strength resulted in the formation of Lewis adducts with progressively red-shifted primary charge-transfer absorption bands. These complexes have absorption spectra that approach those of known conjugated copolymers containing related units. NMR spectroscopy and X-ray diffraction studies revealed that 1 binds 2 equiv of Lewis acid via the nitrogen at the 3-position of BT.