Zhi Peng Tong

Synthesis, Properties and Application in Optical Memory of a New Photochromic Diarylethene Based on a Chlorine Atom

A new unsymmetrical photochromic diarylethene 1-(2,4-dimethyl-3-isoxazol)-2-[2-methyl-5-(2-chlorophenyl) -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 red upon irradiation with 297 nm UV light, in which absorption maxima were observed at 515 nm in hexane and at 526 nm in PMMA film, The results demonstrated that it can be potentially used as polarization holographic optical recording medium.

Synthesis and Properties of a New Photochromic Compound Bearing Isoxazol Moiety

A new unsymmetrical photochromic diarylethene, 1-(2,4-dimethyl-3-isoxazol)-2-[2-methyl-5-(3- formyl-4- methoxyl)-3-thienyl]perfluorocyclopentene (1a) was synthesized, its photochromic properties were examined, the result indicated that the Diarylethene 1a changed the color from colorless to purple upon irradiation with 297 nm UV light, in which absorption maxima were observed at 538 and 541 nm in methanol and PMMA film, respectively. In methanol solution, the open-ring isomer of the diarylethene 1 exhibited relatively fluorescence at 501 nm when excited at 305 nm.

Synthesis and Photochromism of a Novel Diarylethene Bearing Xylosyltriazolyl Groups

A new unsymmetrical photochromic diarylethene, 1-{2-methyl-5-[5-(2,3,5-trihydroxyl-β-D-xylosyl)-3-(1,2,3-triazolyl)] methylene-3-thienyl}-2-[2-methyl-5-(4-methoxylphenyl) methyl-3-thienyl] perfluorocyclopentene (1a), was synthesized, and its photochromic properties were investigated in detail. The compound exhibited good photochromism both in acetonitrile solution and in PMMA film with alternating irradiation by UV/vis light, and the maxima absorption of its closed-ring isomer 1b are 556 and 560 nm, respectively. There almost no fluorescence switches of 1a in acetonitrile solution and PMMA amorphous film. The diarylethene 1a has promising application for photo-switching, which can use for data storage.

Study on Composite Synthesis and Properties of a Novel Diarylethene Material Bearing Nitrile Group

A new unsymmetrical photochromic diarylethene, 1-(2-methyl-5-methylenehydroxyl-3-thienyl)-2-(2-cyanophenyl)perfluorocyclopentene(1a) was synthesized, its photochromic properties were examined, the result indicated that the diarylethene 1a changed the color from colorless to red upon irradiation with 297 nm UV light, in which absorption maxima were observed at 510 and 523 nm in hexane and PMMA film, respectively. In hexane solution, the open-ring isomer of the diarylethene 1 exhibited relatively fluorescence at 441 nm when excited at 294 nm.

Photoinduced Anisotropy in a New Diarylethene Bearing Five and Six-Membered Aryl

A new symmetrical photochromic diarylethene, 1-(2-methyl-5-formyl)-2-(2- cyanophenyl) perfluorocyclopentene(1a), was synthesized, and its photochromic properties were investigated in detail. The compound exhibited good photochromism both in solution and in PMMA film with alternating irradiation by UV/VIS light, and the maxima absorption of its closed-ring isomer 1b are 544 and 549 nm, respectively. The photochromism properties of 1a diarylethene show good photochromism in hexane and in PMMA amorphous film. Steady state fluorescence studies indicated that 1a diarylethene is higher fluorescent in the open-ring isomer, but there almost no fluorescence in the closed-ring isomer in PMMA amorphous film. The diarylethene 1a has promising application for photo-switching, fluorescence-switching which can use for data storage.

Synthesis and Optoelectronic Properties of a Novel Photochromic Diarylethene Bearing a Six-Membered Aryl Unit

A new photochromic diarylethene, 1-(2-ethyl-3-benzothienyl)-2-[2-methyl-5-(3-trifluoromethylphenyl)-3-thieny] perfluorocyclopentene (1a) was synthesized, and its photochromic and fluorescent properties were also investigated. such as photochromism in solution as well as in polymethylmethacrylate (PMMA) amorphous films, Diarylethene 1a changed the color from colorless to purple upon irradiation with 297 nm UV light, in which absorption maxima were observed at 555 nm in hexane and at 581nm in PMMA amorphous film, the result showed that it can be useful in molecular scale optoelectronics and potential use for data storage. In hexane solution, the open-ring isomer of the diarylethene 1 exhibited relatively strong fluorescence at 413 nm when excited at 303 nm. The fluorescence intensity decreased along with the photochromism upon irradiation with 297 nm light and its closed-ring isomer showed weak fluorescence.

A Photochromic Diarylethene with Five and Six-Membered Aryl Units

A photochromic diarylethene bearing a six-membered aryl unit 1-[(2,5-dimethyl-3-thienyl)]-2-[2-methy-4-(3,5-difluorophenyl)-phenyl]perfluoroyclopentene (1a) was synthesized and its photochromic and fluorescent properties were also investigated in detail. The results showed that this compound exhibited reversible photochromism, changing from colorless to red after irradiation with UV light, in which absorption maxima were observed at 521 and 536nm in hexane and PMMA film, respectively. The fluorescence intensity decreased along with the photochromism upon irradiation with 297 nm light in hexane.

Synthesis and Optoelectronic Properties of a New Photochromic Diarylethene Bearing a Cyano Group

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.

Synthesis，Properties and Application in Optical Memory of a Novel Photochromic Diarylethene Bearing a Six-Membered Aryl Unit

A new unsymmetrical photochromic diarylethene 1-(2-ethyl-3-benzothienyl)-2-[2-octyl-5-formyl-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 blue upon irradiation with 297 nm UV light, in which absorption maxima were observed at 581 nm in hexane and at 582 nm in PMMA film, The results demonstrated that it can be potentially used as polarization holographic optical recording medium.

Synthesis and Properties of a Novel Photochromic Diarylethene Bearing Methyl Group

A new unsymmetrical photochromic diarylethene 1-(2,4-dimethyl-3-isoxazol)-2-[2-methyl-5-(2-methyl)-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 pink upon irradiation with 297 nm UV light, in which absorption maxima were observed at 518 nm in hexane and at 527 nm in PMMA film, respectively. In hexane solution, the open-ring isomer of the diarylethene 1 exhibited relatively fluorescence at 386 nm when excited at 309 nm.