Nm In Hexane Solution Research Articles

Synthesis and Photochromic Properties of Diarylethene 1-[2,4-dimethyl-5-thiazolyl]-2-[2-methyl-5-(2-methylphenyl)-3-thienyl]perfluorocyclopentene

A new unsymmetrical photochromic diarylethene, 1-[2,4-dimethyl-5-thiazolyl]-2-[2-methyl-5-(3-4-trifluoromethylphenyl)-3-thienyl] perfluorocyclopentene (1o) was synthesized, and its properties, such as photochromism in solution as well as in poly-methylmethacrylate (PMMA) amorphous film, and fluorescence properties were investigated in detail. The results showed the compound exhibited good photochromism in hexane solution and in PMMA amorphous film, the maxima absorption of its closed-ring isomer1care 490 nm and 495 nm respectively. The open-ring isomer of the diarylethene1oexhibited relatively strong fluorescence at 449 nm in hexane solution (2 × 10-5mol/L) when excited at 330 nm and at 438 nm in PMMA amorphous film when excited at 280 nm. The fluorescence intensity decreased along with the photochromism upon irradiation with 297 nm light.

Photochromism, Kinetics and Fluorescence of 1-(2-methyl-3-benzofuranyl)-2-[2-methyl-5-(4-cyanophenyl)-3-thienyl]perfluorocyclopentene

An unsymmetrical photochromic diarylethene compound, 1-(2-methyl-3-benzofuranyl)-2-[2-methyl-5-(4-cyanophenyl)-3-thienyperfluorocyclopentene was synthesized, and its photochromic properties, kinetics of the photochromic cyclization/cycloreversion and fluorescence were investigated in detail. The compound exhibited good photochromism, changing from colorless to red after irradiation with 297 nm UV light, in which absorption maxima were observed at 530 nm in hexane solution. Simultaneously, cyclization/cycloreversion kinetics of this diarylethene was researched. The open-ring isomer of the diarylethene exhibited relatively strong fluorescence at 377 nm in hexane solution (2 × 10-5 mol L-1), when excited at 327 nm. The fluorescence intensity decreased along with the photochromism upon irradiation with 297 nm light. The fluorescence spectra of the diarylethene are depended on the concentration.

Syntheses and Properties of 1-(2-ethyl-1-benzofuran-3-yl)-2-(2-methyl-1-benzothiophene-3-yl)Perfluorocyclopentene

An unsymmertrical diarylethene compound 1-(2-methyl-1-benzofuran-3-yl)-2-[2-methyl-1-benzothiophene-3-y Perfluorocyclopentene was synthesized and its photochromism was investigated, the results showed that this compound exhibited reversible photochromism, inducing cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light both in solution and in PMMA film. When irradiated 297 nm UV light, the maximum absorption was observed at 498 nm and 509 nm in hexane solution and in PMMA film, respectively.

Photochemistry Properties of a Novel Photochromic Diarylethene Derivative

A new unsymmetrical photochromic diarylethene, 1-[2, 4-dimethyl-5-thiazoly-2-[2-methyl-5-(3-methylphenyl)-3-thienyperfluorocyclopentene (1o) were synthesized, and its properties, such as photochromism in solution as well as in poly-methylmethacrylate (PMMA) amorphous films, and fluorescence properties were investigated in detail. The results showed the compound exhibited good photochromism in hexane solution and in PMMA amorphous film, the maxima absorption of its closed-ring isomer 1c are 492 nm and 498 nm respectively. The open-ring isomer of the diarylethene 1 exhibited relatively strong fluorescence at 465 nm in hexane solution (5 × 10-5 mol/L) when excited at 289 nm. The fluorescence intensity decreased along with the photochromism upon irradiation with 297 nm light. The fluorescence intensity of diarylethene 1o also depended on the concentration. When the concentration of diarylethene 1o in hexane increase from 1 × 10-6 mol/L to 2 × 10-4 mol/L, the fluorescence intensity of the open-ring isomer become strong first, then become weak.

Synthesis and Properties of a Novel Photochromic Diarylethene 1-(2,4-dimethyl-5-thiazolyl)-2-[2-methyl-5-(4-formylphenyl)-3-thienyl]perfluorocyclopentene

A new unsymmetrical photochromic diarylethene, 1-(2, 4-dimethyl-5-thiazolyl)-2-[2-methyl-5-(4-formylphenyl)-3-thienyperfluorocyclopentene (1o) were synthesized. At the same time, its photochromic properties and fluorescence switch were investigated in detail. The results showed 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 of closed-ring isomer 1c were observed at 501 nm in hexane and at 510 nm in PMMA amorphous film, respectively, upon irradiation with 297 nm UV light. The open-ring isomer of the diarylethene 1 exhibited relatively strong fluorescence at 449 nm in hexane solution (2 × 10-5 mol/L) and 450 nm in PMMA amorphous film when excited at 300 nm and 292 nm, respectively. The fluorescence intensity decreased along with the photochromism upon irradiation with 297 nm light. The fluorescence intensity of diarylethene 1o also depended on the concentration. When the concentration of diarylethene 1o in hexane increase from 1 × 10-6 mol/L to 2 × 10-4 mol/L, the fluorescence intensity of the open-ring isomer become strong first, then become weak.

Synthesizes and Properties of a Novel Unsymmetrical Photochromic Diarylethene Material

A new unsymmetrical photochromic diarylethene, 1-(2,4-dimethoxy-5-pyrimidinyl)- 2-(2-methyl-5-pyridine-3-thienyl) perfluoroncyclopentene (1a) was synthesized and its photochemical and fluorescent properties were inverstigated. The measurement results demonstrated that the compound had good photochromism in hexane solution upon irradiation with 297 nm UV light. And the cyclization process of the compound were determined to be the zeroth order reaction by UV-Vis spectra. Besides, the open-ring isomer of the diarylethene exhibited relatively stronger fluorescence at 406 nm when excited at 289 nm in hexane solution.

Study on Photochromic Materials with Synthesizes and Properties of a Novel Unsymmetrical Photochromic Diarylethene

A novel unsymmetrical photochromic diarylethene 1-(2-methyl-3-benzofuran)-2-[5-(2-methylbenzene)-2-methyl-3-thieny perfluorocyclopentene1owas 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.

Synthesis, Photochromism and Optical Recording Properties of a Diarylethene Materials Bearing an Isoxazole Unit

A new unsymmetrical photochromic diarylethene, 1-(3,5-dimethyl-4-isoxazolyl)-2-[2-methyl-5-(4-formylphenyl)-3- thienyl]perfluorocyclopentene(1a) were synthesized, and its properties, such as photochromism and fluorescence properties, were investigated in detail. The results showed that this compound had good thermal stability and exhibited reversible photochromism, changing from colorless to darkred after irradiation with UV light both in solution and in PMMA amorphous film, the maxima absorption of its closed-ring isomer 1b are 529 nm and 541 nm respectively. The open-ring isomer of the diarylethene 1a exhibited relatively strong fluorescence at 492 nm in hexane solution (2 × 10-5 mol/L) when excited at 418 nm. The fluorescence intensity decreased along with the photochromism upon irradiation with 297 nm light. This new photochromic system also exhibited remarkable optical storage character.

Synthesis a New Function Materials and Photochromic Properties of Diarylethene Bearing a Naphthalene and Isoxazole Moiety

A new photochromic diarylethene compound 1-(2-methylnaphthyl)-2-(3, 5-dimethyl-4-isoxazolyl)perfluorocyclopentene (1o), was synthesized and its photochromic and fluorescent properties were investigated. Diarylethene 1o changed the color from colorless to yellow upon irraditation with 297 nm UV light, which the absorption maxima were observed at 446 nm in hexane solution. The kinetic experiments indicated that the cyclization/cycloreversion process of the compound was determined to be the zeroth/first order reaction in hexane solution. The fluorescence intensity decreased along with the photochromism upon irradiation with 297 nm light and its closed-ring isomer showed weak fluorescence

Synthesis and Properties of a Novel Photochromic Diarylethene Material Bearing Two Five-Membered Aryl Unit

A new unsymmetrical photochromic diarylethene, 1-(2,5-dimethyl-3-thienyl)-2-(2 -methyl-5-p-tolyl-3-thienyl)perfluorocyclopentene (1) was synthesized, and its photochromic and fluorescence properties were investigated. The results showed the compound exhibited good photochromism in hexane solution and in PMMA amorphous film with alternating irradiation by UV/Vis light, the maxima absorption of its closed-ring isomer 1c are 541 nm and 551 nm respectively. The open-ring isomer of the diarylethene 1 exhibited relatively strong fluorescence at 360 nm in hexane solution (5 × 10-5 mol/L) when excited at 305 nm. The fluorescence intensity decreased along with the photochromism upon irradiation with 297 nm light. The fluorescence intensity of diarylethene 1o also depended on the concentration. When the concentration of diarylethene 1 in hexane increase from 1 × 10-6 mol/L to 1 × 10-3 mol/L, the fluorescence intensity of the open-ring isomer become strong first, then become weak

Photochromic, Kinetics, and Fluorescence of a Novel Diarylethene

A new unsymmetrical photochromic diarylethene, 1-(2-ethyl-3-benzofuranyl)-2-(2,5 -dimethyl-3-thienyl)perfluorocyclopentene (1) was synthesized, and its photochromic properties and kinetics of the photochromic cyclization/cycloreversion were investigated. The results showed that the cyclization/cycloreversion process of these compounds were determined to be the zeroth/first order reaction.The compound exhibited good photochromism in hexane solution with alternating irradiation by UV/Vis light, and the maxima absorption of its closed-ring isomer 1c are 502 nm. The open-ring isomer of the diarylethene 1 exhibited relatively strong fluorescence at 402 nm in hexane solution (2 × 10-5 mol/L) and 412 nm in PMMA amorphous film when excited at 312 nm and 310 nm,respectively. The fluorescence intensity decreased along with the photochromism upon irradiation with 297 nm light and its closed-ring isomer showed almost no fluorescence.The fluorescence spectra of diarylethene 1o depended on the concentration.

Synthesis and Optical Property of an Asymmetric Photochromic Diarylethene Derivative Bearing Benzofuran

A new asymmetric photochromic diarylethene bearing a benzofuran unit was synthesized, namely [1-(2-methyl-3-benzofuranyl)-2-(2-methoxyphenyl)]perfluorocyclopentene (1o). Its photochromic and fluorescent properties were investigated, respectively. The compound exhibited reversible photochromism, changing from colorless to red upon irradiation with UV light both in solution and in PMMA film. The diarylethene exhibited relatively strong fluorescence at 410 nm in hexane solution and 462 nm in PMMA amorphous film when excited at 300 and 385 nm, respectively. The fluorescence intensity decreased along with the photochromism both in hexane and PMMA film upon irradiation with 297 nm light.

Photochromism of New Hybrid Diarylethenes Bearing a Thiophene and Isoxazole Moiety

A new photochromic diarylethene compound 1-[2-methyl-3-thienyl]-2-[3, 5-dimethyl-4-isoxazolyl]perfluorocyclopentene (1o), was synthesized and its photochromic and fluorescent properties were investigated. Diarylethene 1o changed the color from colorless to orange upon irraditation with 297 nm UV light, which the absorption maxima were observed at 486 nm in hexane solution. This new photochromic system also showed remarkable fluorescence switching in the solid state. Finally, rewritable optical storage using 1o was performed. The results demonstrated that the compound was very sensitive responding to 633 nm recording laser.

Synthesis, photochromism and holographic optical recording of a novel diarylethene bearing a pyrrole unit

A unsymmetrical photochromic diarylethene, 1-[2-methyl-5-(3-fluorophenyl)-3-thienyl]-2 -(2-cyano-1,5-dimethyl-4-pyrryl)hexafluorocyclopentene (1o), was synthesized. The photoconversion ratios from open-ring to closed-ring isomers at photostationary state under UV irradiation in hexane solution was measured by HPLC, and the properties, including photochromism and fluorescence properties were also investigated systematically. The results showed that this compound had good thermal stability and exhibited reversible photochromism, changing from colorless to blue after irradiation with UV light both in solution and in PMMA amorphous film. The open-ring isomer of the diarylethene 1 exhibited relatively strong fluorescence at 427 nm in hexane solution (5×10−5 mol/L) when excited at 340 nm. The fluorescence intensity decreased along with the photochromism upon irradiation with 297 nm light and its closed-ring isomer showed almost no fluorescence. Using diarylethene 1 as recording medium, polarization holographic optical recording was carried out successfully.