Improved deep-red phosphorescence in cyclometalated iridium complexes via ancillary ligand modification,Inorganic Chemistry Frontiers

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Improved deep-red phosphorescence in cyclometalated iridium complexes via ancillary ligand modification
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020/02/07 , DOI: 10.1039/c9qi01584a
Evanta Kabir _{1,

2,

3,

4} , Yanyu Wu _{1,

2,

3,

4} , Steven Sittel _{1,

2,

3,

4} , Boi-Lien Nguyen _{1,

2,

3,

4} , Thomas S. Teets _{1,

2,

3,

4}

Affiliation

In this work, we describe bis-cyclometalated iridium complexes with efficient deep-red luminescence. Two different cyclometalating (C^N) ligands-1-phenylisoquinoline (piq) and 2-(2-pyridyl)benzothiophene (btp)-are used with five strong π-donating ancillary ligands (L^X) to furnish a suite of nine new complexes with the general formula Ir(C^N)₂(L^X). Improvements in deep-red photoluminescence quantum yields were accomplished by the incorporation of sterically encumbering substituents onto the ancillary ligand, which can enhance the radiative rate constant (k_r) and/or reduce the non-radiative rate constant (k_nr). Five of the complexes were characterized by X-ray crystallography, and all of them were investigated by in-depth spectroscopic and electrochemical measurements.

中文翻译：

通过辅助配体修饰改善环金属化铱配合物中的深红色磷光

在这项工作中，我们描述了具有有效的深红色发光的双环金属化铱配合物。使用两个不同的环金属化（C ^ N）配体-1-苯基异喹啉（piq）和2-（2-吡啶基）苯并噻吩（btp）-与五个强π-供体辅助配体（L ^ X）结合使用，提供了九个通式为Ir（C ^ N）₂（L ^ X）的新配合物。深红色光致发光量子产率的提高是通过在辅助配体上引入位阻性取代基来实现的，这可以提高辐射速率常数（k _r）和/或降低非辐射速率常数（k _nr））。X射线晶体学表征了五种配合物，并通过深入的光谱和电化学测量对它们进行了研究。

更新日期：2020-03-19

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