Blue phosphorescent iridium complexes based on 2-(fluoro substituted phenyl)-4-methylpyridines: Synthesis, crystal structure, and photophysics
摘要:
A series blue phosphorescent emitting materials based on 2-(fluoro substituted phenyl)-4-methylpyridine as the cyclometalated ligands have been synthesized and characterized. The complexes have the general structure (C(boolean AND)N)(2)Ir(pic), where C(boolean AND)N is a monoanionic cyclometalating ligand (e.g., 2-(2,4-difluorophenyl)4-methylpyridine (24f(2)pmpyH), 2-(3,4-difluorophenyl)-4-methylpyridine (34f(2)pmpyH), 2-(3,5difluorophenyl)-4-methylpyridine (35f(2)pmpyH), and 2-(3,4,5-trifluorophenyl)-4-methyl-pyridine (345f(3) pmpyH)), pic is 2-picolinic acid. The absorption, emission, cyclic voltammetry and thermostability of the complexes were systematically investigated. The (46f(2)pmpy)(2)Ir(pic) has been characterized using X-ray crystallography and the electronic ground state calculated using B3LYP density functional theory. HOMO levels are a mixture of Ir and 2-(fluoro phenyl)-4-methylpyridine ligand orbitals, while the LUMO is predominantly pic ligand based. Introduction of fluorine atoms and methyl group into ppy ligand and changing in position of F substituents in phenyl ring can finely tune emission of the complexes, showing bright blue-to-green luminescence at a wavelength of 463-501 nm at room temperature in CH(2)Cl(2). (c) 2008 Elsevier B.V. All rights reserved.
PdF: A simple catalytic system, broad substrate scope, and high versatility provide a useful and facileaccess to partiallyfluorinatedaromatics (see scheme). Tuning the reaction conditions enables a diverse range of product structures to be prepared.
Blue phosphorescent iridium complexes based on 2-(fluoro substituted phenyl)-4-methylpyridines: Synthesis, crystal structure, and photophysics
作者:Maoliang Xu、Rui Zhou、GeYang Wang、Jiyi Yu
DOI:10.1016/j.ica.2008.09.054
日期:2009.5
A series blue phosphorescent emitting materials based on 2-(fluoro substituted phenyl)-4-methylpyridine as the cyclometalated ligands have been synthesized and characterized. The complexes have the general structure (C(boolean AND)N)(2)Ir(pic), where C(boolean AND)N is a monoanionic cyclometalating ligand (e.g., 2-(2,4-difluorophenyl)4-methylpyridine (24f(2)pmpyH), 2-(3,4-difluorophenyl)-4-methylpyridine (34f(2)pmpyH), 2-(3,5difluorophenyl)-4-methylpyridine (35f(2)pmpyH), and 2-(3,4,5-trifluorophenyl)-4-methyl-pyridine (345f(3) pmpyH)), pic is 2-picolinic acid. The absorption, emission, cyclic voltammetry and thermostability of the complexes were systematically investigated. The (46f(2)pmpy)(2)Ir(pic) has been characterized using X-ray crystallography and the electronic ground state calculated using B3LYP density functional theory. HOMO levels are a mixture of Ir and 2-(fluoro phenyl)-4-methylpyridine ligand orbitals, while the LUMO is predominantly pic ligand based. Introduction of fluorine atoms and methyl group into ppy ligand and changing in position of F substituents in phenyl ring can finely tune emission of the complexes, showing bright blue-to-green luminescence at a wavelength of 463-501 nm at room temperature in CH(2)Cl(2). (c) 2008 Elsevier B.V. All rights reserved.