通过[Pt(C^N^C) ((L) ]复合体中的重辅助联体增强发光特性,L=AsPh3和SbPh3
Rose Jordan1, Iván Maisuls2, Shruthi S Nair3,4
1University of Cologne, Faculty for Mathematics and Natural Sciences, Department of Chemistry, Institute for Inorganic Chemistry, Greinstrasse 6, D-50939 Köln, Germany. rjordan1@uni-koeln.de.
Dalton transactions (Cambridge, England : 2003)
|November 28, 2023
概括
在复合体中引入重型核素原子,通过增强旋转轨道合来增强三重排放. 像这样的更重元素显示出更好的光发光率和辐射率,为高效的三重发射材料铺平了道路.
科学领域:
- 材料科学 材料科学 材料科学
- 无机化学 无机化学 有机化学
- 光物理学的光学物理学
背景情况:
- 开发高效的三重发射材料对于先进的光电子应用至关重要.
- 重原子效应,特别是旋转轨道合 (SOC),是增强系统间交叉 (ISC) 和三重排放的关键.
- 循环金属化过渡金属复合物为调整光物理性质提供了一个多功能平台.
研究的目的:
- 为了研究引入重型核素 (Pn) 原子进入双环金属化Pt(II) 复合体对三重排放的影响.
- 探索重原子的性质和光物理性质之间的关系,如光发光量子产量和辐射速率.
- 了解辅助PnPh3配体在通过SOC提高排放效率方面的作用.
主要方法:
- 用单晶X射线衍射,紫外线吸收和发射光谱学,短暂吸收 (TA) 光谱学和循环电量计 (CV) 来合成和全面描述Pt(II) 复合物与Pn = P,As,Sb.
- 结合实验和理论 (混合TD-DFT) 方法来分析激发状态和光物理过程.
- 通过重型化物联体对自旋轨道合 (SOC) 增强的研究.
主要成果:
- 在整个系列P < As < Sb.中观察到吸收和排放最大值的红移,以及光学和电化学的HOMO-LUMO差距.
- 对于较重的 pnictogen 同类物来说,观察到光发光量子产量 (ΦL) 和辐射速率 (kr) 的增加,这归因于混合金属到联体电荷转移 (MLCT) /联体中心 (LC) 三重状态.
- TA光谱学揭示了通过ISC分配给T1状态群体的ps范围过程,重型PnPh3配体通过更强的SOC和Pt-Pn键强度提高了排放效率.
结论:
- 在Pt(II) 复合体中引入较重的核素原子 (P,As,Sb) 通过增加旋转轨道合,有效地增强三重排放.
- PnPh3辅助配体在提高排放效率方面发挥着重要作用.
- 理论计算有助于理解实验结果,并推断出难以获得的Bi导数,突出显示转移的挑战.
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