Two triphenylamines with thieno [3,2-b] thiophene units were designed and synthesized. The radical cations obtained by the one-electron oxidation of these amines show a significant absorption in the near-infrared region. In particular, the derivative with three hexyl groups has excellent solubility, and its radical cation has a maximum absorption wavelength above 1400 nm. DFT calculations support these experimental results. A novel design strategy for NIR-II dyes is described.

中文翻译：

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噻吩并[3,2-b]噻吩附加三芳胺自由基阳离子的合成与性质：吸收超过1400 nm的近红外吸收染料

设计并合成了两种具有噻吩并[3,2- b ]噻吩单元的三苯胺。通过这些胺的单电子氧化获得的自由基阳离子在近红外区域表现出显着的吸收。特别是具有三个己基的衍生物具有优异的溶解性，其自由基阳离子的最大吸收波长在1400nm以上。DFT 计算支持这些实验结果。描述了 NIR-II 染料的新颖设计策略。