Iridium(III) complexes with 1-phenylisoquinoline-4-carbonitrile units for efficient NIR organic light-emitting diodes.

Three Ir(III) complexes show a decreasing trend on the oxidation potentials (from 0.72 V to 0.51 V vs. ferrocene), and this can be explained by the fact that the electron-withdrawing group, i.e., CN, can increase the electron deficiency at the meta -position (C C-Ir ), while the electron-donating groups, i.e., C(CH 3 ) 3 , and a pair of CH 3 groups can increase the electron richness of the phenyl ring, resulting in the different degrees of electron donation from CˆN ligand to the d orbitals of Ir(III) center of three complexes, hence leading to the gradually elevated HOMO levels.

also in 47,180 other papers