Isomers of Coumarin-Based Cyclometalated Ir(III) Complexes with Easily Tuned Phosphorescent Color and Features for Highly Efficient Organic Light-Emitting Diodes
作者:Zhao Feng、Yue Yu、Xiaolong Yang、Daokun Zhong、Dongdong Song、Hua Yang、Xi Chen、Guijiang Zhou、Zhaoxin Wu
DOI:10.1021/acs.inorgchem.9b00534
日期:2019.6.3
Three Ir(C∧N)2(acac)-type and one Ir(C1∧N)(C2∧N)(acac)-type coumarin-based cyclometalated Ir(III) complex isomers (IrC5, IrC7, IrC7-A, and IrC8) have been obtained using three coumarin-based isomers of 2-phenylpyridine (ppy)-type cyclometalating ligands (L-C5, L-C7, and L-C8). Two coordination isomers emerging as principal products (IrC7 and IrC7-A) are obtained in the synthesis of corresponding coumarin-based
三个红外(C ∧ N)2(ACAC)型和一个IR(C 1 ∧ N)(C 2 ∧ N)(ACAC)型香豆素系环金属化铱(III)配合物的异构体(IRC5,IrC7,IrC7- A和IrC8已使用2-苯基吡啶(ppy)型环金属化配体的三个香豆素基异构体(L-C5,L-C7和L-C8)获得。两种配位异构体成为主要产物(IrC7和IrC7-A)是在相应的香豆素基环金属化Ir(III)配合物的合成中获得的,因为配体L-C7中两个不同的配位点形成了C-Ir键。据我们所知,迄今尚无此类异构体的报道。有趣的是,通过改变香豆素骨架的稠合苯环上的吡啶基取代位置,已经实现了从绿色(IrC8,λ= 516 nm)到红色(IrC5,λ= 608 nm)的磷光色调节。此外,基于自然跃迁轨道(NTO)分析,这些基于香豆素的环金属化Ir(III)复杂异构体的最低三重态激发态(T 1)的特征也可以通过这些配体异构体轻松调整