Papers by Keyword: Diarylethene

Abstract: A novel unsymmetrical photochromic diarylethene 1-(2-methyl-3-benzofuran)-2-[5-(2-methylbenzene)-2-methyl-3-thieny perfluorocyclopentene 1o was synthesized, then its photochromic, Kinetics and fluorescence properties were investigated. The results showed that the diarylethene compound had good photochromism upon irradiation with 297 nm UV light, in which the absorption maximum were observed at 510 nm in hexane solution and 524 nm in poly methyl methacrylate (PMMA) film. Besides, the cyclization and cycloreversion process of the compound were determined to be the zeroth and first order reaction by UV-Vis spectra, respectively. And, the open-ring isomer of the diarylethene exhibited relatively stronger fluorescence at 427 nm when excited at 273 nm in hexane solution.

Abstract: A novel unsymmetrical photochromic diarylethene, 1-[2-methyl-5-(3,5-difluorophenyl)- 3-thienyl]-2-(2-methyl-5-formyl-3-thienyl) perfluorocyclopentene (1) has been synthesized. Its photochromic and properties have been investigated in detail. Specifically, photochromism in solution and in polymethylmethacrylate (PMMA) amorphous films were studied. The results showed that this compound exhibited reversible photochromism, changing from colorless to blue after irradiation with UV light both in solution and in PMMA amorphous film. The photochromic reaction kinetics indicated that the cyclization processes of 1 belong to the zeroth order reaction and the cycloreversion process belong to the first order reaction. In addition, photomode rewritable optical storage using 1b was performed. The images demonstrated that the compound can be used as optical storage material.

Abstract: A novel unsymmetrical diarylethene derivative bearing thiophene moieties, in which a methyl group was substituted at the ortho-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 556 nm in hexane and at 560 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.

Abstract: A novel unsymmetrical diarylethene derivative bearing both benzofuran and thiophene moieties, 1-(2-methyl--3-benzofuranyl)-2-[(2-methyl-3-thienyl-5-thienyl)-3-thieny perfluorocyclopentene (1o), was synthesized. At the same time, its photochromic properties 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 523 nm in hexane and at 539 nm in PMMA amorphous film, respectively, upon irradiation with 297 nm UV light. Finally, using this diarylethene as recording medium, polarization optical recording was carried out successfully.

Abstract: A new photochromic diarylethene bearing thiophene and naphtyl unit 1-(2-methyl-1-naphthyl)-2-[2-methyl-5-(2-cyanophenyl)-3-thienyl]perfluorocyclopentene (1o), was synthesized and its phtochromic, fluorescence, kinetics and optical recording properties were investigated in detail. This compound exhibited remarkable photochromism, changing from colorless to red after irradiation with 297 nm UV light both in solution and in PMMA film. Finally, using diarylethene 1c as recording medium, polarization optical recording was carried out successfully.

Abstract: A new unsymmetrical photochromic diarylethene 1-(2-methyl-benzofuran-3-yl)-2-(2-n-butyl-5-(1,3-dithiolane)-thiophene-3-yl) perfluoroncyclopentene (1o), was synthesized and its optoelectronic properties, such as photochromism in solution as well as in poly-methylmethacrylate (PMMA) amorphous films, and the fluorescence spectra of diarylethene 1a was investigated. Using diarylethene 1c/PMMA film as recording medium and a linearly polarized 633 nm laser diode for recording and readout, polarization multiplexed image recording can be carried out in this film, which illustrated that the diarylethene can be potentially used as holographic optical recording medium.

Abstract: A novel unsymmetrical photochromic diarylethene 1-(2-methyl-3-benzothienyl)-2-{2-n-butyl-5-[2-(1,3-dioxolane)]-3-thienyl}perfluorocyclopentene(1O) was synthesized, and its photochromic, fluorescent and optical strorage properties were investigated. The compounds 1O exhibited remarkable photochromism both in solution and in PMMA film, and the results showed that the cyclization/cycloreversion process of the compound was determined to be the zeroth/first order reaction. In addition, this new photochromic system also exhibited remarkable optical storage character.

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 599 nm in hexane and at 609 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 light in PMMA. In hexane solution, the open-ring isomer of the diarylethene 1 exhibited relatively strong fluorescence at 419 nm when excited at 309 nm. The fluorescence intensity is highest at the concentration of 5.0×10^-5 mol/L when excited at 309 nm.

Abstract: 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.

Abstract: A novel photochromic diarylethene, 1-[(2-methyl-5-(4-fluorophenyl)-3-thienyl)]-2-(2-methyl-1-naphthyl) perfluorocyclopentene (1o), was synthesized. Its optoelectronic properties, such as photochromism in solution as well as in poly-methylmethacrylate (PMMA) amorphous films, fluorescences 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 511 nm in hexane and at 522 nm in PMMA amorphous film, respectively, upon irradiation with 297 nm UV light.