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A cyano-based electron-accepting building block to design n-type conjugated polymers with absorption wavelength of

Yinghui Wang^1,2, Bin Meng¹, Jian Liu^1,2

¹State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China. mengbin@ciac.ac.cn.

Chemical Communications (Cambridge, England)

|January 19, 2023

Abstract:

There are much fewer n-type conjugated polymers than p-type counterparts because of the lack of strong electron-accepting building blocks. We report a novel strong electron-accepting unit based on a dicyanomethylene unit. The resulting polymers exhibit LUMO energy levels of as low as -4.04 eV and narrow optical gaps with an onset absorption wavelength of 1050 nm. Moreover, the polymers exhibit near-infrared light absorption with good photostability because of their low-lying LUMO/HOMO energy levels.

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