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=chlorine-methyl substituted, 2,4 diphenyl quinoline, acac=acetyl acetone is characterized by employing different techniques such as mass spectrometry, 1H 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 (1MLCT) and triplet metal-to-ligand charge-transfer (3MLCT) absorption peaks at 353 and 437 nm 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.

► Synthesized chlorine-methyl-substituted 2,4 diphenyl quinoline Iridium(III) complex.
► Soluble Ir(Cl-MDPQ)2(acac) complex emits at deep red wavelength of 662 nm.
► This complex is very promising for applications in flexible organic devices.