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Design and Synthesis of Heteroleptic Cyclometalated Iridium(III) Complexes Containing Quinoline-Type Ligands that Exhibit Dual Phosphorescence
Sarvendra Kumar†, Yosuke Hisamatsu†, Yusuke Tamaki‡, Osamu Ishitani‡, and Shin Aoki*†§
†Faculty of Pharmaceutical Science and §Imaging Frontier Cancer, Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
‡ Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1-NE-1 O-okayama, Meguro-Ku, Tokyo 152-8550, Japan
Inorg. Chem., 2016, 55 (8), pp 3829–3843
Publication Date (Web): April 06, 2016
Copyright © 2016 American Chemical Society
*E-mail: email@example.com. Phone: +81-4-7121-3670.
A new class of heteroleptic cyclometalated Ir(III) complexes having quinoline derivatives as ancillary ligands have been designed and synthesized. It is reported that Ir(III) complexes having 8-sulfonamidoquinolines as the third ligands exhibit dual emission at ca. 500 nm and ca. 600 nm, resulting in a near white-color emission at 298 K and a white emission at 77 K.
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, 13–21) 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 14–18 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.
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