Mechanochemical changes on cyclometalated Ir(III) acyclic carbene complexes – design and tuning of luminescent mechanochromic transition metal complexes,Inorganic Chemistry Frontiers

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Mechanochemical changes on cyclometalated Ir(III) acyclic carbene complexes – design and tuning of luminescent mechanochromic transition metal complexes
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2019/12/02 , DOI: 10.1039/c9qi01278h
Jingqi Han _{1,

2,

3,

4} , Kin-Man Tang _{1,

2,

3,

4} , Shun-Cheung Cheng _{1,

2,

3,

4} , Chi-On Ng _{1,

2,

3,

4} , Yuen-Kiu Chun _{1,

2,

3,

4} , Shing-Lun Chan _{1,

2,

3,

4} , Shek-Man Yiu _{1,

2,

3,

4} , Man-Kit Tse _{1,

2,

3,

4} , Vellaisamy A. L. Roy _{2,

3,

4,

5} , Chi-Chiu Ko _{1,

2,

3,

4}

Affiliation

A new class of luminescent mechanochromic cyclometalated Ir(III) complexes with pyridyl acyclic carbene ligands have been developed. These complexes shown predominant MLCT phosphorescence mixed with ³LC character. In the solid state and neat film, the emission of these complexes show significant red-shift upon mechanical grinding. On the basis of XRD, X-ray crystallography, Raman spectroscopy and DFT calculation, the mechanically-induced variations of the molecular packing and the structural conformation have been elucidated. With the understanding of their mechanochemical changes, it enables the design of luminescent mechanochromic compounds with tailored mechanochromic properties, including the emission color and the mechanochromic shift, through judicious structural modifications of the ligands as illustrated in the complexes reported in this work. It would also open up new design of mechanoresponsive materials.

中文翻译：

环金属化的Ir（III）无环卡宾配合物的机械化学变化-发光的机械变色过渡金属配合物的设计和调谐

已经开发了具有吡啶基无环卡宾配体的新型的发光机械变色环金属化的Ir（III）配合物。这些复合物显示出主要的MLCT磷光与^3种混合LC字符。在固态和纯净薄膜中，这些配合物的发射物在机械研磨后显示出明显的红移。在X射线衍射，X射线晶体学，拉曼光谱和DFT计算的基础上，阐明了分子堆积和结构构象的机械诱导变化。通过了解它们的机械化学变化，可以通过对配体进行明智的结构修饰，设计出具有定制的机械致变色特性的发光机械致变色化合物，包括发射色和机械致变色，如本研究报道的配合物中所示。它还将开辟机械响应材料的新设计。

更新日期：2020-02-13

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