Non-Stereogenic Dinuclear Ir(III) Complex with a Molecular Rack Design to Afford Efficient Thermally Enhanced Red Emission
作者:Marsel Z. Shafikov、Ross Martinscroft、Craig Hodgson、Anna Hayer、Armin Auch、Valery N. Kozhevnikov
DOI:10.1021/acs.inorgchem.0c03251
日期:2021.2.1
Cyclometalated complexes containing two or more metal centers were recently shown to offer photophysical properties that are advantageous compared to their mononuclear analogues. Here we report the design, synthesis, and luminescent properties of a dinuclear Ir(III) complex formed by a ditopic N^C^N–N^C^N bridging ligand (L1) with pyrimidine as a linking heterocycle. Two dianionic C^N^C terminal ligands
最近显示,含有两个或多个金属中心的环金属化配合物具有光物理性质,与它们的单核类似物相比,具有优势。在这里,我们报告了由双位N ^ C ^ N–N ^ C ^ N桥连配体(L 1)与嘧啶为连接杂环形成的双核Ir(III)配合物的设计,合成和发光性质。两个二阴离子C ^ N ^ C末端配体被用来获得电荷中性和非立体生成的双核络合物5。该复合物显示出高效的红色发射,最大值为λem对于甲苯溶液测得的λ= 642nm。用于脱气的样品测得的复合物的衰减时间和发射量子产率是τ= 1.31微秒和Φ PL = 80%,分别相应于辐射率ķ - [R = 6.11·10 5小号-1。该速率值比发绿光的单核类似物3快大约四倍。低温温度测量结果显示,最低三重态T 1为5的三个基板发射的衰变时间为τ(I)= 120μs,τ(II)= 7μs和τ(III)= 1μs与单核复合物3相比,其值为τ(I)= 192μs,τ(II)=