Papers by Author: Wei Jun Liu

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Authors: Wei Jun Liu, Wei Ping Wang, Gang Liu
Abstract: A new blue photochromic diarylethene compound, 1-[5-(3,5-difluorinphenyl)-2-methyl-3-thienyl]-2-[5-(3-cyanophenyl)-2-methyl-3-thienyl]perfluoroclopentene (1a), was synthesized and its photochemical properties were investigated in detail. The results demonstrated that the compound has good photochromism in solution and in PMMA amorphous film, and good fluorescence and optical storage properties.
81
Authors: Hong Liang Liu, Shou Zhi Pu, Shi Qiang Cui, Wei Jun Liu
Abstract: A novel photochromic diarylethene based on pyrazole moiety was synthesized and its photochromic and fluorescent properties were also investigated. The compound exhibited remarkable photochromism, changing from colorless to purple after irradiation with UV light both in solution and in PMMA film. In hexane solution and in PMMA film, the open-ring isomer of the diarylethene 1 exhibited relatively remarkable fluorescence. The results indicated that the pyrazole moiety played a very important role during the process of photochromic reaction for the diarylethene derivative. Using this dithienylethene 1c as optical storage was performed successfully.
53
Authors: Hong Liang Liu, Shou Zhi Pu, Wei Jun Liu, Shi Qiang Cui
Abstract: A novel photochromic diarylethene based on isoxazole moiety was synthesized and its photochromic and fluorescent properties were also investigated. It underwent reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light in hexane and in PMMA film. The compound exhibited remarkable photochromism, changing from colorless to purple after irradiation with UV light. When irradiation with UV light, the fluorescence intensity declined remarkably. The results showed that the diarylethene exhibited a relatively strong fluorescence switch along with the photochromism from open-ring isomer to closed-ring isomer. Using this dithienylethene 1c as optical storage was performed successfully.
3290
Authors: Wei Jun Liu, Yan Lu, Shou Zhi Pu
Abstract: A novel unsymmetrical diarylethene derivative bearing both phenyl and thiophene moieties, in which a chlorine group was substituted at the para-positions of the terminal phenyl ring, was synthesized. At the same time, its photochromic properties and fluorescence switch were investigated in detail. The results showed that this compound exhibited reversible photochromism, undergoing reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light both in solution and in PMMA film, and its absorption maxima were observed at 541 nm in hexane and at 550 nm in PMMA amorphous film, respectively, upon irradiation with 297 nm UV light. The fluorescence intensity of diarylethene decreased dramatically along with the photochromism from open-ring isomer to closed-ring isomer upon irradiation with 297 nm UV light in PMMA. In hexane solution, the open-ring isomer of the diarylethene 1 exhibited relatively strong fluorescence at 462 nm when excited at 316 nm.
1519
Authors: Hong Liang Liu, Gang Liu, Shi Qiang Cui, Wei Jun Liu
Abstract: A novel photochromic diarylethene based on isoxazole moiety was synthesized and its photochromic and fluorescent properties were also investigated. This compound exhibited reversible photochromism, changing from colorless to red after irradiation with UV light both in solution and in poly-methyl methacrylate (PMMA) amorphous film. Also, it exhibited remarkable fluorescence switching in the solid state. The results showed that the diarylethene exhibited a relatively strong fluorescence switch along with the photochromism from open-ring isomer to closed-ring isomer. Using this dithienylethene 1c as optical storage was performed successfully.
1070
Authors: Duo Hua Jiang, Gang Liu, Wei Jun Liu
Abstract: An unsymmetrical diarylethene derivative was synthesized, and its photochromic properties and fluorescence switch were investigated in detail. The results showed that this compound exhibited reversible photochromism, undergoing reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light both in solution and in PMMA film, and its absorption maxima were observed at 548 nm in hexane and at 558 nm in PMMA amorphous film, respectively, upon irradiation with 297 nm UV light. The PMMA film of the diarylethene 1a exhibited relatively strong fluorescence at 413 nm when excited at 311 nm. The fluorscence intensity is highest at the concentration of 1.0×10-4 mol/L when excited at 311 nm.
13
Authors: Duo Hua Jiang, Gang Liu, Wei Jun Liu
Abstract: An unsymmetrical diarylethene derivative was synthesized and its photochromic properties and fluorescence switch were investigated in detail. The results showed that this compound exhibited reversible photochromism, undergoing reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light both in solution and in PMMA film, and its absorption maxima were observed at 524 nm in hexane and at 532 nm in PMMA amorphous film, respectively, upon irradiation with 297 nm UV light. The PMMA film of the diarylethene 1a exhibited relatively strong fluorescence at 415 nm when excited at 318 nm. The fluorscence intensity is highest at the concentration of 1.0×10-4 mol/L when excited at 300 nm.
49
Authors: Xue Li, Wei Jun Liu, Gang Liu
Abstract: A novel photochromic diarylethene,1-(3,5-dimethyl-4-isoxazolyl)-2-[2-methyl-5-(10-phenanthrenyl)-3-thienyl]Perfluorocyclopentene was synthesized and its photochromic and fluorescent properties were also investigated. The compound exhibited remarkable photochromism, changing from colorless to pink after irradiation with UV light both in solution and in PMMA film. The fluorescence intensity declined remarkably,when irradiation with UV light. Using this diarylethene 1 as optical storage was performed successfully.
130
Authors: Duo Hua Jiang, Mei Ping Wu, Shou Zhi Pu, Wei Jun Liu
Abstract: A novel unsymmetrical diarylethene derivative bearing both phenyl and thiophene moieties, in which a trifluoromethyl group was substituted at the meta-positions of the terminal phenyl ring, was synthesized. At the same time, its photochromic properties and fluorescence switch were investigated in detail. The results showed that this compound exhibited reversible photochromism, undergoing reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light both in solution and in PMMA film, and its absorption maxima were observed at 517 nm in hexane and at 523 nm in PMMA amorphous film, respectively, upon irradiation with 297 nm UV light. The fluorescence intensity of diarylethene decreased dramatically along with the photochromism from open-ring isomer to closed-ring isomer upon irradiation with 297 nm UV light in PMMA. In hexane solution, the open-ring isomer of the diarylethene 1 exhibited relatively strong fluorescence at 395 nm when excited at 295 nm.
1511
Authors: Zhi Peng Tong, Shou Zhi Pu, Shi Qiang Cui, Wei Jun Liu
Abstract: A newunsymmetrical photochromic diarylethene 1-(2-cyanophenyl)-2-[2-methy-5-(3-fluorophenyl)-3-thienyl]perfluorocyclopentene (1a) has been synthesized. Its photochromic properties in solution and PMMA film were investigated. Diarylethene 1a changed the color from colorless to purple upon irradiation with 297 nm UV light, in which absorption maxima were observed at 540 nm in hexane and at 545 nm in PMMA film, respectively. This new photochromic system also exhibited remarkable fluorescence switching in the solid state. The results demonstrated that it can be potentially used as polarization holographic optical recording medium.
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