具有查尔根嵌合作用的扩展螺旋亚珀尔二亚胺二聚体中的高效系统间交叉

IF 2.9 2区 化学 Q3 CHEMISTRY, PHYSICAL
Xingyu Chen, Xiaoqi Luo, Kangwei Wang, Xiaoxiao You, Jingwen Xu, Shaoqian Peng, Di Wu* and Jianlong Xia*, 
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引用次数: 0

摘要

三重态是光功能器件中的关键中间体,因此其特性和形成机制受到了广泛研究。具体来说,螺旋 PDI 二聚体(PDI 的水平扩展 π 共轭衍生物)作为电子受体在提高光电性能方面表现出色。因此,探索螺旋 PDI 二聚体中三重态的产生对理解其机理和挖掘其进一步的应用具有至关重要的作用。我们利用 Se-annulation 技术诱导螺旋 PDI 二聚体中的体系间交叉(ISC),并通过瞬态吸收光谱和空穴电子分析方法进一步系统地探索了随着 Se 原子数量的增加而产生的三重态演化过程。结果表明,扭曲的分子构象为母体分子 PDI2 中潜在的 ISC 铺平了道路。与母体分子 PDI2(ϕTPDI2 = 26.5%)相比,硒原子的加入可明显提高 ISC 的效率(ϕTPDI2-2Se = 96.9%),这表明在 π 扩展体系中,缩醛嵌段也是一种有效的策略。我们的研究结果为理解三重进化过程提供了有益的启示,有助于拓宽 π 扩展 PDI 系统在高性能光伏领域的应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Efficient Intersystem Crossing in Extended Helical Perylene Diimide Dimers with Chalcogen-Annulation

Efficient Intersystem Crossing in Extended Helical Perylene Diimide Dimers with Chalcogen-Annulation

Efficient Intersystem Crossing in Extended Helical Perylene Diimide Dimers with Chalcogen-Annulation

The properties and formation mechanisms of the triplet state have been widely investigated since they are crucial intermediates in photo functional devices. Specifically, helical PDI dimers, horizontal expanded π-conjugated derivatives of PDI, have shown outstanding performance as electron acceptors in enhancing the performance of photovoltaics. Therefore, the exploration of triplet generation in helical PDI dimers plays a crucial role in understanding the mechanisms and excavating their further application. We make use of Se-annulation to induce intersystem crossing (ISC) in helical PDI dimers and further explore the triplet evolution process systematically as the number of Se atoms increases by transient absorption spectroscopy and the hole–electron analysis method. It shows that the twisted molecular conformation has paved the way for potential ISC in a parent molecule PDI2. The incorporation of Se atoms can result in evident promotion in the efficiency of ISC (ϕTPDI2-2Se = 96.9%) compared to the parent molecule PDI2TPDI2 = 26.5%), indicating that chalcogen-annulation is also an efficient strategy in a π-extended system. Our results provide useful insights for understanding the triplet evolution process, which can help broaden the application of the π-extended PDI system into high-performance photovoltaics.

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来源期刊
CiteScore
5.80
自引率
9.10%
发文量
965
审稿时长
1.6 months
期刊介绍: An essential criterion for acceptance of research articles in the journal is that they provide new physical insight. Please refer to the New Physical Insights virtual issue on what constitutes new physical insight. Manuscripts that are essentially reporting data or applications of data are, in general, not suitable for publication in JPC B.
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