Baumann Alexandra, Curiac Christine, Delcamp Jared H
Department of Chemistry and Biochemistry, Coulter Hall, University of Mississippi, University, MS, 38677, USA.
ChemSusChem. 2020 May 22;13(10):2503-2512. doi: 10.1002/cssc.202000409. Epub 2020 Mar 25.
"The Hagfeldt donor" is a bulky triarylamine building block with four alkyl chains in a 3-dimensional arrangement that is used with organic dyes in dye-sensitized solar cells (DSCs) in over 140 publications. Many of the highest performing DSC devices in literature make use of this group due to exceptional TiO surface protection properties, which slows recombination of electrons in TiO with the electrolyte. Importantly, record-setting cobalt and copper redox shuttle-based DSCs require exceptional surface protection to slow a facile recombination of electrons to these positively charged redox shuttles. Several syntheses have emerged for the Hagfeldt donor due to the need for iterative aryl-halide cross- coupling reactions complicating a straightforward route. Six synthetic strategies found in literature are described along with the challenges of each route. A recent method that has been put forward in the literature as a scalable, regioisomerically pure route is highlighted.
“哈格费尔特供体”是一种体积较大的三芳基胺结构单元，带有四条呈三维排列的烷基链，在140多篇出版物中，它与有机染料一起用于染料敏化太阳能电池（DSC）。文献中许多性能最佳的DSC器件都使用了该基团，这是因为它具有出色的二氧化钛表面保护性能，能够减缓二氧化钛中电子与电解质的复合。重要的是，创纪录的基于钴和铜氧化还原穿梭体的DSC需要出色的表面保护，以减缓电子与这些带正电的氧化还原穿梭体的快速复合。由于需要进行迭代芳基卤化物交叉偶联反应，使得直接合成路线变得复杂，因此出现了几种合成哈格费尔特供体的方法。本文描述了文献中发现的六种合成策略以及每条路线面临的挑战。重点介绍了文献中最近提出的一种可扩展、区域异构体纯的路线。
