- Cyclometalated Platinum(II) Complexes with Donor-Acceptor-Containing Bidentate Ligands and Their Application Studies as Organic Resistive Memories
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A series of heteroleptic cyclometalated platinum(II) complexes, [Pt(C^N)(O^O)], (1–10) with various donors and acceptors has been synthesized and characterized by 1H NMR spectroscopy, elemental analyses, infrared spectroscopy and mass spectrometry. The X-ray structure of 2 has also been determined. The electrochemical and photophysical properties of the platinum(II) complexes were studied. These experimental results have been supported by computational studies. Furthermore, two of the complexes have been employed as the active material in the fabrication of resistive memory devices, exhibiting stable binary memory performance with low operating voltage, high ON/OFF ratio and long retention time.
- Poh, Wei Church,Au-Yeung, Ho-Leung,Chan, Alan Kwun-Wa,Hong, Eugene Yau-Hin,Cheng, Yat-Hin,Leung, Ming-Yi,Lai, Shiu-Lun,Low, Kam-Hung,Yam, Vivian Wing-Wah
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p. 3669 - 3676
(2021/09/29)
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- Cationic Polycarbazole Networks as Visible-Light Heterogeneous Photocatalysts for Oxidative Organic Transformations
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Photoredox catalysis has aroused great interest from chemists, as it offers a powerful tool for organic synthesis. Cationic polycarbazole networks (CPOP-28 and CPOP-29) were prepared via simple oxidative coupling reaction and applied as heterogeneous photocatalysts for a wide range of oxidative organic transformations, including oxidation of sulfides, hydroxylation of arylboronic acids, and cross-dehydrogenative coupling reactions, in the presence of visible light and air. Remarkably, photocatalytic activities are enhanced by ingenious introduction of trifluoromethyl groups to the polymeric network CPOP-29. The effects of the trifluoromethyl group on photocatalytic activities were elucidated in terms of photophysical and electrochemical properties. The appealing photocatalytic performance of the trifluoromethylated polymer is ascribed to superior light-absorption ability, longer fluorescence lifetime, and stronger oxidative capability. In addition, the photocatalysts showed good recyclability and could be reused after a simple separation workup.
- Liang, Hai-Peng,Chen, Qi,Han, Bao-Hang
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p. 5313 - 5322
(2018/05/14)
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- Substituent effects on the photophysical and electrochemical properties of iridium(III) complexes containing an arylcarbazolyl moiety
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A series of new heteroleptic cyclometalated iridium(III) complexes containing a 9-(4-(pyridin-2-yl)phenyl)-9H-carbazole molecular framework have been successfully synthesized and characterized. All of the iridium(III) complexes are thermally stable solids and highly efficient electrophosphors. Different substituents, electron-donating group (-CH3) and electron-withdrawing groups (-F, -CF3), were introduced into either the 4- or 5-position of the pyridyl ring in the ligands to verify their influence on the photophysical, electrochemical, photo- and electrophosphoresence properties of these iridium phosphors. Electrophosphorescent OLEDs with outstanding device performance can be fabricated based on the complex bearing a 5-CF3 unit which exhibited a maximum luminance efficiency of approximately 43.2 cd A-1, corresponding to an external quantum efficiency of approximately 12.6% and a power efficiency of 27.1 lm W-1.
- Liu, Chun,Rao, Xiaofeng,Lv, Xin,Qiu, Jieshan,Jin, Zilin
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