Effects of Geometrical Isomerism on Emissive Behaviour of Heteroleptic Cyclometalated Ir(III) Complexes
Effects of Geometrical Isomerism on Emissive Behaviour of Heteroleptic Cyclometalated Ir(III) Complexes
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几何异构现象对杂配环金属化Ir(III)配合物发射行为的影响
DOI：
10.1039/d1dt00783a
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
and Hisako Sato
中科院分区：
文献类型：
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作者：
Yoshiki Jinsenji;Kazuyoshi Takimoto;Jun Yoshida;Shigeki Mori;Yutaka Watanabe;and Hisako Sato
在这项研究中，我们报告了一个杂配环取代的Ir（III）配合物，[Ir（bzq）2（PBO）]（bzqH =苯并[h]喹啉; PBOH = 2-（2-羟基苯基）苯并恶唑）的发光性能。合成了配合物[Ir（C^N）2（N^O）]，并用手性柱进行了光学拆分。两个几何异构体，反式-（N，N）和顺式-（N，N）异构体，得到的主要和次要产品的对映体纯的形式，分别。它们的分子结构用单晶X射线分析确定。在结晶状态下，PBO−和bzq−中的H原子之间的分子间C-H <$π相互作用是影响分子堆积的主要因素。当配合物溶于二氯甲烷中，在N2气氛下，在430 nm处激发时，反式-（N，N）和顺式-（N，N）异构体分别产生黄色（λ max = 550 nm）和橙子（λmax = 570 nm）荧光，且前者的量子产率高于后者.
In this study, we report the emissive properties of a heteroleptic cyclometalated Ir(III) complex, [Ir(bzq)2(PBO)] (bzqH = benzo[h]quinoline; PBOH = 2-(2-hydroxyphenyl)benzoxazole). The complex, [Ir(C^N)2(N^O)], was synthesised and optically resolved using a chiral column. Two geometrical isomers, trans-(N,N) and cis-(N,N) isomers, were obtained as the major and minor products in an enantiopure form, respectively. Their molecular structures were determined using single crystal X-ray analysis. In the crystalline states, the intermolecular C–H⋯π interaction between PBO− and an H atom in bzq− was the main factor influencing molecular packing. When the complexes were dissolved in CH2Cl2 and excited at 430 nm under N2 atmosphere, yellow (λmax = 550 nm) and orange emissions (λmax = 570 nm) were observed for the trans-(N,N) and cis-(N,N) isomers, respectively, with the quantum yield higher for the former than the latter.