AIPE-active Pt(II) complexes with a tunable triplet excited state: design, mechanochromism and application in anti-counterfeiting,Inorganic Chemistry Frontiers

当前位置： X-MOL 学术 › Inorg. Chem. Front. › 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.)

AIPE-active Pt(II) complexes with a tunable triplet excited state: design, mechanochromism and application in anti-counterfeiting
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020-10-10 , DOI: 10.1039/d0qi00735h
Senqiang Zhu _{1,

2,

3,

4} , Jinyang Hu _{1,

2,

3,

4} , Shengliang Zhai _{1,

2,

3,

4} , Yutian Wang _{1,

2,

3,

4} , Zengchuang Xu _{4,

5,

6,

7} , Rui Liu _{1,

2,

3,

4} , Hongjun Zhu _{1,

2,

3,

4}

Affiliation

To understand the fundamental mechanism of aggregation-induced phosphorescent emission (AIPE) and to improve the development of mechanochromic molecules, five new Pt(II) complexes Pt-1–Pt-5 bearing different terminal substituents on 1,3-di(2-pyridyl)benzene (N^C^N) ligands were designed and synthesized. Their photophysical properties have been investigated systematically via a series of spectroscopic methods. Upon excitation, the solid states of these Pt complexes exhibit tunable emissions from yellow to red, and complexes Pt-2 and Pt-3 with a large steric hindrance display remarkable AIPE properties in a tetrahydrofuran/H₂O mixture. All complexes, except Pt-5, show evident mechanochromic and vapochromic behaviors. Based on in-depth experimental studies, the reason for the mechanochromic behavior could be the change in the distance of the neighboring Pt complexes, which causes a switching of the emission state from ³π,π*/³MLCT (metal-to-ligand charge transfer) to ³MLCT. The above results suggest an example of phosphorescence tuning by a switching of the triplet excited state in the solid state, and provide a mechanism of mechanochromic behavior. Furthermore, complex Pt-2 was used as an emission ink in the field of advanced anti-counterfeiting.

中文翻译：

具有可调三重态激发态的AIPE活性Pt（II）配合物：设计，机械变色及其在防伪中的应用

为了了解聚集诱导的磷光发射（AIPE）的基本机理并改善机械变色分子的发展，在1,3-di（2-）上带有五个不同末端取代基的五个新的Pt（II）络合物Pt-1–Pt-5设计并合成了吡啶基）苯（N ^ C ^ N）配体。它们的光物理性质已通过一系列分光镜方法进行了系统研究。激发后，这些Pt配合物的固态表现出从黄色到红色的可调发射，并且具有大位阻的配合物Pt-2和Pt-3在四氢呋喃/ H ₂ O混合物中显示出显着的AIPE性能。所有复合物，Pt-5除外表现出明显的机械变色和气相变色行为。基于深入的实验研究，为对力致行为的原因可能是在邻近的Pt配合物的距离的变化，这会导致发光状态的切换从³ π，π* / ³ MLCT（金属-配体电荷转移）到³ MLCT。以上结果提出了通过在固态下三重态激发态的切换来进行磷光调节的示例，并提供了机械变色行为的机制。此外，在先进的防伪领域中，络合物Pt-2被用作发光油墨。

更新日期：2020-11-03

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11