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Yan J, Xue Q, Yang H, Yiu SM, Zhang YX, Xie G, Chi Y. Regioselective Syntheses of Imidazo[4,5- b]pyrazin-2-ylidene-Based Chelates and Blue Emissive Iridium(III) Phosphors for Solution-Processed OLEDs. Inorg Chem 2022; 61:8797-8805. [PMID: 35652376 DOI: 10.1021/acs.inorgchem.2c00750] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Six homoleptic Ir(III) complexes bearing imidazo[4,5-b]pyrazin-2-ylidene chelates were successfully designed and synthesized. Narrowband blue emission (λmax = 466-485 nm) and broadened green emission (λmax = 518-532 nm) in degassed toluene solution with high photoluminescent quantum yields in the range of 75-81 and 45-48% were observed for f-timpz, t2impz, and t2empz as well as m-timpz, t2impz, and t2empz, respectively. In addition, the tert-butylphenyl cyclometalate is more electron donating than N-phenyl cyclometalate and, hence, all tert-butylphenyl-substituted derivatives, that is, m- and f-t2impz and m- and f-t2empz, give more red-shifted emission in comparison to that of m- and f-timpz. Moreover, solution-processed OLED with f-t2empz (20 wt %) as the dopant gave electrophosphorescence at 474 nm with maximum external quantum efficiency (max. EQE) of 5.1%, while hyper-OLED with assistant sensitizer f-t2empz (10 wt %) and the multi-resonance thermally activated delayed fluorescence emitter BCzBN (0.5 wt %) afforded narrowband emission centered at 485 nm and max. EQE up to 17.4%, confirming the high potential of this class of Ir(III) metal phosphors.
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Affiliation(s)
- Jie Yan
- Department of Materials Science and Engineering, Department of Chemistry, Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Kowloon 999077, Hong Kong SAR, China
| | - Qin Xue
- Department of Physical Science and Technology, Central China Normal University, Wuhan 430079, China
| | - Hui Yang
- Department of Materials Science and Engineering, Department of Chemistry, Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Kowloon 999077, Hong Kong SAR, China
| | - Shek-Man Yiu
- Department of Materials Science and Engineering, Department of Chemistry, Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Kowloon 999077, Hong Kong SAR, China
| | - Ye-Xin Zhang
- Suzhou Joysun Advanced Materials Co., Ltd., Suzhou 215126, Jiangsu, China
| | - Guohua Xie
- Sauvage Center for Molecular Sciences, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Department of Chemistry, Wuhan University, Wuhan 430072, China
| | - Yun Chi
- Department of Materials Science and Engineering, Department of Chemistry, Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Kowloon 999077, Hong Kong SAR, China
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Ding Y, Zhang R, Ma R, Ma Y. Iodine‐Catalyzed Double [4+2] Oxidative Annulations for the Synthesis of Bipyrazines from Ketones and Diamines by a Domino Strategy. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100991] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yuxin Ding
- Institute of Advanced Studies and School of Pharmaceutical and Chemical Engineering Taizhou University 1139 Shifu Avenue Taizhou 318000 People's Republic Of China
- School of Pharmaceutical Science Zhejiang Chinese Medical University Hangzhou 310053 People's Republic Of China
| | - Ruiqin Zhang
- School of Pharmaceutical Science Zhejiang Chinese Medical University Hangzhou 310053 People's Republic Of China
| | - Renchao Ma
- Institute of Advanced Studies and School of Pharmaceutical and Chemical Engineering Taizhou University 1139 Shifu Avenue Taizhou 318000 People's Republic Of China
| | - Yongmin Ma
- Institute of Advanced Studies and School of Pharmaceutical and Chemical Engineering Taizhou University 1139 Shifu Avenue Taizhou 318000 People's Republic Of China
- School of Pharmaceutical Science Zhejiang Chinese Medical University Hangzhou 310053 People's Republic Of China
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Jiménez-Cruz JC, Guzmán-Mejía R, Juaristi E, Sánchez-Antonio O, García-Revilla MA, González-Campos JB, Aviña-Verduzco J. Preparation of aromatic γ-hydroxyketones by means of Heck coupling of aryl halides and 2,3-dihydrofuran, catalyzed by a palladium( ii) glycine complex under microwave irradiation. NEW J CHEM 2020. [DOI: 10.1039/d0nj02630a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The synthesis of phenyl-γ-hydroxyketones through Heck coupling and subsequent opening of the tetrahydrofuran ring by the nucleophilic attack of a water molecule catalyzed by PdCl2·Gly2 under microwave irradiation.
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Affiliation(s)
- Juan C. Jiménez-Cruz
- Instituto de Investigaciones Químico Biológicas
- Universidad Michoacana de San Nicolás de Hidalgo
- 58030 Morelia
- Mexico
| | - Ramón Guzmán-Mejía
- Instituto de Investigaciones Químico Biológicas
- Universidad Michoacana de San Nicolás de Hidalgo
- 58030 Morelia
- Mexico
| | - Eusebio Juaristi
- Departamento de Química
- Centro de Investigación y de Estudios Avanzados
- Avenida Instituto Politécnico
- 07360 Ciudad de México
- Mexico
| | - Omar Sánchez-Antonio
- Departamento de Química
- Centro de Investigación y de Estudios Avanzados
- Avenida Instituto Politécnico
- 07360 Ciudad de México
- Mexico
| | | | - J. Betzabe González-Campos
- Instituto de Investigaciones Químico Biológicas
- Universidad Michoacana de San Nicolás de Hidalgo
- 58030 Morelia
- Mexico
| | - Judit Aviña-Verduzco
- Instituto de Investigaciones Químico Biológicas
- Universidad Michoacana de San Nicolás de Hidalgo
- 58030 Morelia
- Mexico
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Affiliation(s)
- Steven M. Bachrach
- School of Science, Monmouth University, 400 Cedar Avenue, West Long Branch, New Jersey 07764, United States
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