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Design and Synthesis of Heteroleptic Cyclometalated Iridium(III) Complexes Containing Quinoline-Type Ligands that Exhibit Dual Phosphorescence

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posted on 06.04.2016, 16:19 authored by Sarvendra Kumar, Yosuke Hisamatsu, Yusuke Tamaki, Osamu Ishitani, Shin Aoki
The design and synthesis of some cyclometalated iridium­(III) complexes containing quinoline-type ligands as ancillary ligands are reported. The emission spectra of Ir­(III) complexes containing a quinolinolate (6, 8, 10) moiety exhibit a single emission peak at ca. 590 nm, resulting in a red colored emission. However, Ir­(III) complexes containing 8-sulfonamidoquinoline ligands (11, 1321) exhibit two different emission peaks (dual emission) at ca. 500 nm and ca. 600 nm upon excitation at 366 nm, resulting in a red-colored emission for 11 and a pale yellow-colored emission for 1418 at 298 K. Especially, a white emission was observed for 19 at 298 and 77 K in dimethyl sulfoxide. The mechanistic studies based on time-dependent density functional theory calculations and time-resolved emission spectroscopy suggest that this dual emission originates from two independent emission states.