Synthesis, crystal structure and photoluminescent property of an iridium complex with coumarin derivative ligand

Abstract

Novel iridium complex containing coumarin derivative as a cyclometalated ligand (L) and picolinate (pic) as the ancillary ligand, Ir(III) bis(3-(pyridin-2-yl)coumarinato N,C 4)(picolinate) [Ir(L) 2(pic)], was synthesized and characterized. It was demonstrated that the iridium (III) ion in Ir(L) 2(pic) is hexacoordinated by two C atoms and two N atoms from 3-(pyridin-2-yl)coumarin ligands and one N atom and one O atom from picolinate ligand, displaying a distorted octahedral coordination geometry. The Ir(L) 2(pic) has very strong absorption and intensive emission at 532 nm. These results show the promising future of that Ir(L) 2(pic) in fabrication organic light-emitting diodes.