Novel bis- and tris-cyclometalated iridium(<scp>iii</scp>) complexes bearing a benzoyl group on each fluorinated 2-phenylpyridinate ligand aimed at development of blue phosphorescent materials for OLED
Novel blue phosphorescent bis- and tris-cyclometalated iridium(iii) complexes with excellent PL quantum yields were developed, using fluorinated 2-(5-benzoylphenyl)pyridinate ligands.
Direct Decarboxylative<i>Meta</i>-Selective Acylation of Arenes via an<i>Ortho</i>-Ruthenation Strategy
作者:Kun Jing、Zhong-Yuan Li、Guan-Wu Wang
DOI:10.1021/acscatal.8b03695
日期:2018.12.7
using Ru3(CO)12 as the catalyst and α-oxocarboxylic acids as the acylation source, featured broad substrate scope, good functional group tolerance, and high regioselectivity. Mechanistic studies demonstrated that a radical process and an 18e-octahedral ruthenium species were involved in this reaction. The present work provides a new strategy for the regioselective meta-acylation reactions and will
Photokinetic study on remarkable excimer phosphorescence from heteroleptic cyclometalated platinum(<scp>ii</scp>) complexes bearing a benzoylated 2-phenylpyridinate ligand
作者:Naoki Okamura、Takeshi Maeda、Hideki Fujiwara、Anjaly Soman、K. N. Narayanan Unni、Ayyappanpillai Ajayaghosh、Shigeyuki Yagi
DOI:10.1039/c7cp06944h
日期:——
6-difluorophenyl)pyridinate-based complex was 3.5 times larger than that of monomer emission at a doping level of 0.20 mmmol g−1 in PMMA. From the analysis of PL lifetimes at varying concentrations, photokinetic profiles were fully analyzed according to the model system for the irreversible excimer formation, and the excimer formation rate constant of the 5′-benzoylated complex was determined in dichloromethane
合成了由5'-苯甲酰化2-苯基吡啶(ppy)环金属化和乙酰丙酮酸辅助配体组成的新型杂配环金属化铂(Ⅱ)配合物,并研究了它们的光致发光(PL)性能。没有任何其他取代基的5'-苯甲酰化配合物在二氯甲烷(10μM,rt)中于479 nm处显示基于磷光的单体发射,PL量子产率为0.28。另一方面,在聚(甲基丙烯酸甲酯)(PMMA)薄膜中,大约在200nm处还出现了显着的准分子发射。600 nm,当掺杂水平增加到0.20 mmmol g -1时, PL量子产率相对较高,为0.47,与单体排放相比,强度相对较高。在具有未取代的,4'-苯甲酰化和5'-氟化的ppy环金属化配体的配合物的情况下,在相同的掺杂水平下适度产生准分子发射,因此将苯甲酰基引入5'-位是有效的获得显着的准分子发射。苯甲酰基和氟基团的结合在诱导准分子发射方面更有效,并且2-(5-苯甲酰基-4,6-二氟苯基)吡啶基络合物的准分子发射强度是单体发射的3