A New Solution to an Old Problem: Synthesis of Unsubstituted Poly(para-phenylene)
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- 作者：Ali Abdulkarim ; Felix Hinkel ; Daniel Jänsch ; Jan Freudenberg ; Florian E. Golling ; Klaus Müllen
- 刊名：Journal of the American Chemical Society
- 出版年：2016
- 出版时间：December 21, 2016
- 年：2016
- 卷：138
- 期：50
- 页码：16208-16211
- 全文大小：322K
- ISSN：1520-5126
文摘
Unsubstituted and structurally well-defined poly(para-phenylene) (PPP) has been long-desired as an organic semiconductor prototype of conjugated polymers. To date, several attempts to synthesize unsubstituted, pristine, high-molecular-weight PPP have failed. Here we solved this synthetic problem by a versatile precursor route. Suzuki polymerization of kinked disubstituted 1,4-dimethoxycyclohexadienylene monomers yielded a well-soluble, nonaromatic precursor polymer. Its solubility allowed processing by spin-coating into nanometer-thick films. Subsequent additive-free thermal treatment induced aromatization and led to exclusively para-connected, highly fluorescent PPP with a length of about 75 phenylene units.