Journal
INORGANIC CHEMISTRY
Volume 55, Issue 8, Pages 3829-3843Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.5b02872
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Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXI) of Japan [26860016, 24659055, 24640156]
- Grants-in-Aid for Scientific Research [24659055, 26860016, 26460156] Funding Source: KAKEN
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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 run, 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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