Papers by Keyword: Photochromism

Abstract: The optically transparent organic-inorganic terpolymers were obtained on the basis of poly (titanium oxide) and organic monomers of the vinyl series, characterized by the reversible wettability of the surface. The poly (titanium oxide) inside the material had a structure close to anatase and was uniformly distributed over the surface of the sample as it was determined by X-ray phase analysis and electron microscopy. A single-electron transition Ti⁴⁺+ e ^̅ → Ti³⁺ occurred in the samples under UV-irradiation accompanied by a breaking of the Ti-O bond and a decreasing of the terpolymers transparency from 90% to 20%; the process was reversible in time. The reversible of the samples surfaces from hydrophobic to hydrophilic were observed. The water wetting angle varied within 80 °↔ 5 ° range.

Abstract: A new unsymmetrical diarylethene derivative 1-(1, 5-dimethyl-2-pyrrolecarbonitrile) -2-[2-methyl-5-(4-aminomethyl) phenyl-3-thienyl] perfluorocyclopentene (1o) was designed and constructed successfully. Its optoelectronic properties have been discussed systematically, such as photochromic, kinetics experiments in acetonitrile solution and PMMA.

Abstract: A novel photochromic diarylethene was successfully synthesized, which is named 1-[2-methyl-5-phenyl-3-thienyl]-2-[2-methyl-5-(3-aldehyde-4-methoxy)-3-thienyl] perfluorocyclopentene. The compound showed good photochromic behavior. Upon irradiated with UV/vis lights, the color of the compound could be changed between colorless and blue, accompanied by a fluorescence switch between the open-ring isomer and closed-ring isomer.

Abstract: A new unsymmetrical photochromic diarylethene 1-[2-cyano-1, 5-dimethyl-4-pyrryl] -2-[2-methyl-5-(1, 3-dioxolane)-3-thienyl] perfluorocyclopentene has been synthesized, and its properties including photochromism, kinetics and fluorescence have been investigated in detail. The results showed that its photochromic behaviors could be modulated by UV/Vis light, changing from colorless to blue in acetonitrile solution.

Abstract: An unsymmetrical photochromic diarylethene, 1-[2-methyl-3-benzothiophene]-2-[2-methyl-5-(4-pentylphenyl)-3-thienyl] perfluorocyclopentene (1a), has been synthesized, and its properties including photochromism and fluorescence have been investigated. The results showed that this compound undergo reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light in solution.

Abstract: A new compound which called 1-[2,4-dimethyl-5-thiazole]-2-[2-methyl-5-(4-pentylphenyl)-3-thienyl] perfluorocyclopentene (1a) was synthesized. As an photochromic diarylethenes, its properties such as photochromism, photochromic reaction kinetics were investigated in detail. The results showed that 1a has shown good photochromic behavior upon alternating irradiation with UV and visible light in both solution and a PMMA film.

Abstract: A new unsymmetrical photochromic diarylethene compound, 1-[2-methyl-5-(4-trifluoromethylphenyl)-3-thienyl]-2-[2-methyl-5-(3-fluoro-4-chloro) phenyl-3-thienyl] perfluorocyclopentene (1o) was synthesized, and its properties, such as photochromism and fluorescence properties in solution as well as in PMMA amorphous film, were investigated specifically. 1o exhibits good photochromism and fluorescence upon alternating irradiation with UV light and visible light (> 510 nm) in hexane and a PMMA film.

Abstract: A photochromic diarylethene of [1-(3,5-dimethyl-4-iodoisoxazole)-2-(2-methyl-(5-ethynyl) trimethylsilane-3-thienyl) perfluorocyclopentene (1o) was synthesized and characterized. Its properties, including photochromic behavior and fluorescent properties have been investigated. Upon irradiation with UV light with the extended response time, the diarylethene underwent a ring opening reaction to produce closed forms and color change in solution. The results showed the compound exhibited good photochromism in acetonitrile solution. The kinetic experiments showed that the cyclization and cycloreversion processes were zeroth and first order reaction, respectively. Moreover, diarylethene 1o also exhibited obviously fluorescence switches along with the photochromism.

Abstract: A symmetrical photochromic diarylethene was synthesized, and its optoelectronic properties were also investigated. The results showed that this compound exhibited reversible photochromism, changing from colorless to blue after irradiation with UV light in solution. The open-ring isomer of the diarylethene 1o exhibited relatively strong fluorescence at 477 nm in acetonitrile solution (2×10^-5 mol L^-1) when excited at 325 nm. The fluorescence intensity decreased along with the photochromism upon irradiation with 297 nm light. What is more, the kinetic experiments illustrated that the cyclization/cycloreversion process of this compound was determined to be the zeroth/first reaction. In addition, the results demonstrated that the diarylethene 1o had remarkable photochromic properties.

Abstract: A photochromic diarylethene was synthesized and explored, The compound shown good photochromic behavior. When irradiated with UV light. the compound changed from colorless to violet, which showed a relatively strong fluorescence switch along with the photochromism from open-ring isomer to closed-ring isomer.