Bis-Heteroleptic Cationic Iridium(III) Complexes Featuring Cyclometalating 2-Phenylbenzimidazole Ligands: A Combined Experimental and Theoretical Study
作者:Emiliano Martìnez-Vollbert、Charles Ciambrone、William Lafargue-Dit-Hauret、Camille Latouche、Frédérique Loiseau、Pierre-Henri Lanoë
DOI:10.1021/acs.inorgchem.1c02968
日期:2022.2.21
report, we investigate a new family of cationic iridium(III) complexes featuring the cyclometalating ligand 2-phenylbenzimidazole and ancillary ligand 4,4′-dimethyl-2,2′-bipyridine. Our benchmark complex IrL12 (L1 = 2-phenylbenzimidazole) displays emission properties similar to those of the archetypical complex 2,2′-dipyridylbis(2′,4′-phenylpyridine)iridium(III) in deaerated CH3CN (Φ = 0.20, λem = 584
在本报告中,我们研究了一类新的阳离子铱 (III) 配合物,其特征在于环金属化配体 2-苯基苯并咪唑和辅助配体 4,4'-二甲基-2,2'-联吡啶。我们的基准络合物IrL 1 2 ( L 1 = 2-苯基苯并咪唑) 的发射特性与脱气 CH 3 CN (Φ = 0.20,λ em = 584 nm 和 Φ = 0.14,λ em = 585 nm)但在脱气 CH 2 Cl 2中表现出更高的光致发光量子产率(Φ = 0.32,λ em = 566 nm 和 Φ = 0.20,λ时间= 595 nm),尤其是较低的非辐射常数(k nr = 6.6 × 10 5 s –1 vs k nr = 1.4 × 10 6 s –1)。作为初步研究,我们探讨了给电子基团和吸电子基团的引入对苯并咪唑部分的影响以及环金属化苯基部分在对位被相同取代基取代的协同效应。发射能量与引入的取代基的哈米特常数以及ΔE氧化还