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

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,C4)(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.

Graphical abstractA new iridium organometallic compounds, Ir(III)bis(3-(pyridin-2-yl)coumarinato N,C4)(picolinate), was synthesized and characterized. X-ray crystallography demonstrated that Ir atom is six coordinated in the complex. The iridium organometallic complex emits intense green emission, indicating that it is useful for fabrication organic light-emitting diodes.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A novel iridium complex containing coumarin derivative as ligand was synthesized, which exhibits strong emission. ► The crystal structure and the coordination mode of the complex were discussed. ► The complex reported is found to be intense green emitters which is desirable for example in OLED applications.