Appending Diverse π-Extended Acceptors with Tetrathiafulvalene/Dithiafulvalene Donors: Multistate Redox Properties, Radical Ion Generation, and Mid-IR-Absorbing Mixed-Valence States
作者:Sudhir Kumar Keshri、Deepak Asthana、Sonam Chorol、Yogendra Kumar、Pritam Mukhopadhyay
DOI:10.1002/chem.201704604
日期:2018.2.6
orbitals and influence the optoelectronic properties. The D moieties allow the formation of radical cations (D.+) and the π‐extended A moieties aid the formation of radical anions (A.−) by oxidation/reduction under ambient conditions. The molecules revealed UV/Vis/near‐IR absorption, fluorescence extending into the near‐IR region, and amphoteric electrochemical properties. Chromophores 10 and 12 show solvatochromism
通过亚磷酸酯介导的交叉偶联反应合成了三类供体-受体(D–A)π扩展发色团(1 – 12),其中酸酐或酰亚胺基π-As和四硫富瓦烯(TTF)的数目)/二硫富瓦烯(DTF)Ds被系统地改变了。大的π环,例如苯并ylene和co烯,首次被整合到TTF / DTF单元中,以克服它们的高不溶性。π受体中的酸酐和酰亚胺基团可显着改变边界轨道并影响光电性能。D部分允许形成自由基阳离子(D。+),而π扩展的A部分帮助形成自由基阴离子(A .-)通过在环境条件下进行氧化/还原。这些分子显示出UV / Vis /近红外吸收,荧光延伸到近红外区域以及两性电化学性质。发色团10和12在多种溶剂中均表现出溶剂变色现象。相对于酰亚胺基团,具有酸酐官能团的π-A使得电子吸收更容易,而D TTF / DTF单元数目的增加使它们易于氧化。有趣的是,反式-TTF稠合的分子(1,6,和11)在中红外区域显示出混合价态( = 5