Jinsenji Yoshiki, Takimoto Kazuyoshi, Yoshida Jun, Mori Shigeki, Watanabe Yutaka, Sato Hisako
Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan.
Dalton Trans. 2021 Jun 22;50(24):8506-8511. doi: 10.1039/d1dt00783a.
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-Hπ 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.
在本研究中，我们报道了一种杂配环金属化铱（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）的发光性质。该配合物[Ir(C^N)2(N^O)]通过手性柱进行合成和光学拆分。获得了两种几何异构体，反式-(N,N)和顺式-(N,N)异构体，分别作为对映体纯形式的主要和次要产物。使用单晶X射线分析确定了它们的分子结构。在晶体状态下，PBO-与bzq-中的一个H原子之间的分子间C-Hπ相互作用是影响分子堆积的主要因素。当配合物溶解在二氯甲烷中并在氮气气氛下于430 nm处激发时，反式-(N,N)和顺式-(N,N)异构体分别观察到黄色发射（λmax = 550 nm）和橙色发射（λmax = 570 nm），前者的量子产率高于后者。
