Chemically and Photochemically Stable Conjugated Poly(oxadiazole) Derivatives: A Comparison with Polythiophenes and Poly(p-phenyleneethynylenes)

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• 作者：Kangwon Lee ; Hyong-Jun Kim ; Jae Cheol Cho ; Jinsang Kim
• 刊名：Macromolecules
• 出版年：2007
• 出版时间：September 4, 2007
• 年：2007
• 卷：40
• 期：18
• 页码：6457 - 6463
• 全文大小：313K
• 年卷期：v.40,no.18(September 4, 2007)
• ISSN：1520-5835

文摘

We have designed and synthesized highly stable conjugated poly(oxadiazoles) derivatives (PO1and PO2). The oxadiazole-containing conjugated polymers have a strong photoluminescent property and arecompletely soluble in organic solvents. PO1 and two commonly used conjugated polymers, PPE and P3HT,were tested under strong acidic condition and strong UV irradiation condition to investigate their chemical andphotochemical stability. PO1 turned out to be intact through the harsh treatments while the two control polymerswere severely damaged in their conjugated backbone and lost their emissive property. Protonation of the oxadiazoleunit of PO1 by acids induced backbone planarization of PO1, resulting in emission color change from blue togreen. Reversible color change by adding and removing trifluoroacetic acid (TFA) to PO1 and latent fluorescentpatterning by using a photoacid generator and UV irradiation through a photomask were demonstrated. The resultsprovide a design principle to develop highly stable conjugated polymers for various applications wherephotobleaching and oxidation are a common challenging problem.