一种容易获得的 1H-苯并 [f] 吲哚替代室温超长有机磷光,ChemRxiv

当前位置： X-MOL 学术 › ChemRxiv › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

一种容易获得的 1H-苯并 [f] 吲哚替代室温超长有机磷光
ChemRxiv Pub Date : 2022-10-12 , DOI: 10.26434/chemrxiv-2022-dd7pv
Xiaohua Fu ₁ , Xue Zhang ₁ , Chen Qian ₁ , Zhimin Ma ₂ , Zewei Li ₂ , Hong Jiang ₂ , Zhiyong Ma ₁

Affiliation

1H-苯并[f]吲哚（Bd）是室温超长有机磷光（RTUOP）领域的重要单元。然而，Bd的合成难度大、收率低，极大地限制了RTUOP的广泛应用。因此，探索容易获得的 Bd 替代品具有重要意义，尽管充满挑战，但仍需解决。在此，我们报告了一个名为 5H-苯并[b]咔唑 (BCz) 的新单元，它在 RTUOP 中的功能与 1H-苯并 [f]吲哚 (Bd) 类似。BCz可以通过两步反应轻松获得，而Bd的合成需要七步繁琐的反应。令人兴奋的是，容易获得的 BCz 是 RTUOP 中 Bd 的绝佳替代品，并且与 Bd 相比显示出一些优势。首先，BCz 及其衍生物在 77 K 时表现出独特的红移红色超长磷光，而 Bd 则没有。其次，BCz在室温下表现出显着的光激活黄色超长磷光，而Bd的磷光在室温下难以被激活。第三，BCz衍生物（CNPyBCz和CNBrBCz）在室温下显示出与Bd衍生物相似的光激活黄色超长磷光，但磷光寿命更长。第四，表明BCz及其衍生物在粉末基质中除了咔唑对应物外还发出黄色RTUOP。结果表明，BCz和Bd具有相同的阳离子自由基参与的磷光机制，即电荷分离和电荷重组，聚集态磷光的红移源于BCz单元之间增强的π-π相互作用。据我们所知，这项研究为 RTUOP 的未来应用铺平了道路。此外，这项工作表明阳离子自由基参与机制可能在 RTUOP 领域具有普遍性。

"点击查看英文标题和摘要"

A Readily Obtained Alternative of 1H-benzo[f]indole towards Room Temperature Ultralong Organic Phosphorescence

1H-benzo[f]indole (Bd) is a significant unit in the field of room temperature ultralong organic phosphorescence (RTUOP). However, the synthesis of Bd is rather hard and of low yield, which greatly limits the wide applications of RTUOP. Therefore, exploring readily obtained alternatives of Bd is of great significance and demands to be addressed though it is full of challenges. Herein, we report a new unit named 5H-benzo[b]carbazole (BCz) which can function similarly with 1H-benzo[f]indole (Bd) in RTUOP. BCz can be obtained facilely via two steps of reactions while the synthesis of Bd requires seven steps of tedious reactions. Excitingly, readily obtained BCz is an excellent alternative of Bd in RTUOP and shows some advantages in comparison with Bd. Firstly, BCz and its derivatives exhibit distinctive red-shifted red ultralong phosphorescence at 77 K while Bd does not. Secondly, BCz demonstrates remarkable photo-activated yellow ultralong phosphorescence at room temperature while the phosphorescence of Bd is difficult to be activated at room temperature. Thirdly, BCz derivatives (CNPyBCz and CNBrBCz) display similar photo-activated yellow ultralong phosphorescence with Bd derivatives at room temperature but the phosphorescent lifetimes are longer. Fourthly, it is shown that BCz and its derivatives emit yellow RTUOP in the powder matrixes besides their carbazole counterparts. It is revealed that BCz and Bd share the same cation radical-involved phosphorescence mechanism featuring charge separation and charge recombination and the redshift of phosphorescence in the aggregated state arises from the enhanced π-π interactions among BCz units. To our best knowledge, this study paves a simple way for the future applications of RTUOP. Moreover, this work indicates that cation radical-involved mechanism may be universal in the field of RTUOP.

更新日期：2022-10-12

点击分享查看原文

点击收藏

公开下载

阅读更多本刊新发论文