陕西师范大学何晓明团队通过外部重原子调节吩噻嗪二氧化的室温磷光。相关研究成果于2024年11月18日发表在《德国应用化学》。

开发具有超长寿命和平衡量子效率的纯有机材料，是有吸引力但具有挑战性的。

该文中，研究人员提出了一种新的策略，通过柔性烷基链将分子发射体与卤素连接起来，研究外部重原子。X射线晶体分析清楚地揭示了通过卤素供体来调节的卤素C-X-π相互作用，以及它们之间的距离和几何形状。令人印象深刻的是，以氯原子为供体的DOPTZ-C3Cl表现出1351ms的平衡长磷光寿命和10.1%的磷光量子产率。

研究人员还首次证明，Cl在延长寿命方面比较重的卤素（Br和I）具有更积极的作用。该研究将通过外部重原子效应操纵室温磷光加快新的分子设计，并为超长磷光材料的发展突出一种特殊的C-Cl··π相互作用。

附：英文原文

Title: Modulating Room-Temperature Phosphorescence of Phenothiazine Dioxide via External Heavy Atoms

Author: Heyang Li, Huili Ma, Peng Zhang, Zhongfu An, Xiaoming He

Issue&Volume: 2024-11-18

Abstract: Developing pure organic materials with ultralong lifetimes and balanced quantum efficiency is attractive but challenging. In this study, we propose a novel strategy to investigate external heavy atoms by linking molecular emitters with halogen through a flexible alkyl chain. X-ray crystal analysis clearly reveal the halogen C-X-π interactions, which can be tuned by halogen donors, as well as the distance and geometry between them. Impressively, DOPTZ-C3Cl featuring a chloride atom as donor, exhibits a balanced long phosphorescence lifetime of 1351 ms and a phosphorescence quantum yield of 10.1%. We also first demonstrate that Cl can induce more positive effect than heavier halogens (Br and I) on prolonging the lifetime. We envisage that the present study will expedite new molecular design to manipulate the room temperature phosphorescence via external heavy atom effect, and highlight a special C-Cl··π interaction for the development of ultralong phosphorescent materials.

DOI: 10.1002/anie.202419366

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202419366