Papers by Author: Shi Qiang Cui

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-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 new photochromic diarylethene, 1-[2-methyl-(5-(4- dioxolane)phenyl)-3-thienyl]-2-(2-methyl-3-benzofuran) perfluorocyclopentene (1o), was synthesized and its photochromic and fluorescent properties were investigated.The product has been characterized by elemental analyses, NMR spectrometry, UV/vis spectrophotometry and Fluorescence spectrophotometry. This diarylethene exhibited reversible photochromism and notable fluorescence photoswitches both in solution and in PMMA films, changing from colorless to pink after irradiation with 297 nm UV light.

Abstract: A new unsymmetrical photochromic diarylethene bearing a benfuran and a thiophene aryl unit 1-(2-methyl-3-benfuran)-2-{2-methyl-5-[2-(1,3-dioxolane)]-3-thienyl}perfluorocyclopentene (1o) has been synthesized. It’s optoelectronic properties, such as photochromism in solution as well as in polymethylmethacrylate(PMMA) amorphous films, fluorescence and photon-mode polarization multiplexing holographic recording were investigated. Diarylethene 1o changed the color from colorless to red upon irradiation with 313 nm UV light, in which absorption maxima were observed at 509 nm in hexane and at 520 nm in PMMA amorphous film, respectively. This new photochromic system also exhibited remarkable fluorescence intensity and clear fluorescent switches by photo irradiation in solution. Finally, rewritable holographic optical storage using 1a was performed.

Abstract: A novel photochromic diarylethene 1-{[2-methyl-5-formyl-3-thienyl]}-2-[2-methyl-5-(4-cyanophenyl)-3- thienyl]perfluorocyclopentene(1a) has been synthesized for the examination of its properties including photochromism， fluorescence properties and optical recording. Diarylethene 1a changed the color from colorless to cadet blue upon irradiation with 297 nm UV light, in which absorption maxima were observed at 600 nm in hexane and at 610 nm in PMMA film, respectively. The open-ring isomer of the diarylethene 1 exhibited good fluorescence switch in hexane solution. In hexane solution, the open-ring isomer of the diarylethene 1a exhibited relatively fluorescence at 383 nm when excited at 310 nm.

Abstract: Photochromism; Diarylethene materials; Fluorecence; Reaction kinetics. Abstract. A new unsymmetrical photochromic diarylethene, 1-(2-methyl-5-phenyl-3-thienyl)-2-[2-methyl-5-(4-formyl-phenyl)-3-thienyl]perfluorocyclopentene (1a), was synthesized, and its photochromic properties and reaction kinetics were investigated, respectively. The compound exhibited good photochromism both in solution and in PMMA film with alternating irradiation by UV/Vis light. The cyclization processes of compound 1a belong to the zeroth order reaction, while the cycloreversion processes belong to the first order reaction. The optical recording results indicated that the new photochromic diarylethene can be applied in high capacity optical storage.

Abstract: 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.

Abstract: A new photochromic diarylethene 1a has been synthesized, and its photochromic, fluorescent and optical recording strorage properties were investigated. The compound exhibited remarkable photochromism and clear fluorescent switches both in solution and in PMMA film. This new photochromic system also exhibited remarkable optical recording storage character.

Abstract: A new class of diarylethenes based on a hybrid structure of thiophene and naphthalene has been developed and its properties including photochromism, kinetics and fluorescence were investigated in detail. The results showed that the compound exhibited obvious photochromism, changing from colorless to red after irradiation with 297 nm UV light both in solution and in PMMA film. The kinetic experiments indicated that the cyclization/cycloreversion process of the compound was determined to be the zeroth/first order reaction in hexane solution. At last, the results demonstrated that the diarylethene compound had attractive properties for potential application in optical storage.

Abstract: A new unsymmetrical photochromic diarylethene 1-(2-methyl-3-benzofuranyl )-2- (2-n-butyl-5-hydroxymethyl-3-thienyl ) perfluoroncyclopentene (1o) , was synthesized and its optoelectronic properties, such as photochromism in solution as well as in poly-methylmethacrylate (PMMA) amorphous films, fluorescences were investigated. This new photochromic system also exhibited remarkable optical storage character.