Synthesis and photophysics of a new deep red soluble phosphorescent iridium(III) complex based on chlorine-methyl-substituted 2,4 diphenyl quinoline

A new iridium complex with a chlorine-methyl-substituted 2,4 diphenyl quinoline, (Cl-MDPQ) ligand has been synthesized. The synthesized iridium metal complex, Ir(Cl-MDPQ)(2)(acac) where Cl-MDPQ=chlorinemethyl substituted, 2,4 diphenyl quinoline, acac=acetyl acetone is characterized by employing different techniques such as mass spectrometry, H-1 NMR, DTA/TGA, XRD, and FTIR. The molecular structures of Cl-MDPQ and Ir(Cl-MDPQ)(2)(acac) complexes are confirmed by the FTIR spectra. Strong singlet metal-to-ligand charge-transfer ((MLCT)-M-1) and triplet metal-to-ligand charge-transfer ((MLCT)-M-3) absorption peaks at 353 and 437 rim in tetrahydrofuran (THF) are reported in the synthesized complex, respectively. A deep red emitting Ir(Cl-MDPQ)(2)(acac) complex at 662 nm is promising for flexible organic devices. (C) 2011 Elsevier Ltd. All rights reserved.