scholarly journals Photoactuation of Micromechanical Devices by Photochromic Molecules

2021 ◽  
Author(s):  
Jose Elias Angulo Cervera ◽  
Mario Piedrahita-Bello ◽  
Barbora Brachnakova ◽  
Alejandro Enriquez-Cabrera ◽  
Liviu Nicu ◽  
...  
Keyword(s):  
Uv Light ◽  
Nanocomposite Films ◽  
Ring Form ◽  
Open Ring ◽  
Photochromic Molecules ◽  
Micromechanical Devices

Spiropyran doped P(VDF-TrFE) nanocomposite films were spray-coated onto silicon micro-cantilevers. We show that switching the molecules from the closed- to the open-ring form by UV light gives rise to a...

Photochromism and Optical Recording of a Novel Diarylethene Bearing Phenanthrene Unit

2013 ◽  
Vol 763 ◽  
pp. 79-83 ◽  
Author(s):  
Xue Li ◽  
Cong Bin Fan ◽  
Gang Liu
Keyword(s):  
Uv Light ◽  
Light Stimulus ◽  
Optical Recording ◽  
Color Variation ◽  
Pmma Film ◽  
Fluorescent Properties ◽  
Closed Ring ◽  
Fluorescence Switch ◽  
Open Ring ◽  
Photochromic Molecules

Photochromic molecules are part of a large class of materials in which light stimulus not only induces a color variation but also affects other physicochemical properties. In the paper, an asymmetrical photochromic diarylethene, 1-(2,4-dimethyl-3-thiazole)-2-[2-methyl-5-(10-phenanthrenyl)-3-thienyPerfluorocyclopentene was synthesized and its photochromic and fluorescent properties were systematically investigated. The compound exhibited remarkable photochromic, changing from colorless to OrangeRed after irradiation with UV light both in solution and in PMMA film. In addition, its fluorescence property was also discussed. When irradiation with UV light, the fluorescence intensity declined remarkably. The results showed that the diarylethene exhibited a relatively strong fluorescence switch along with the photochromism from open-ring isomer to closed-ring isomer. Using this diarylethene 1a as optical storage was performed successfully.

Synthesis, Optoelectronic Properties of a New Photochromic Diarylethene Bearing Benzothienyl and Malononitrile Group

2011 ◽  
Vol 295-297 ◽  
pp. 208-211
Author(s):  
Cong Bin Fan ◽  
Shou Zhi Pu ◽  
Wei Jun Liu ◽  
Shi Qiang Cui
Keyword(s):  
Data Storage ◽  
Uv Light ◽  
Optical Data Storage ◽  
Optical Data ◽  
Visible Range ◽  
Technical Application ◽  
Ring Form ◽  
Closed Ring ◽  
Open Ring ◽  
Fundamental Research

An unsymmetrical diarylethene derivative bearing both benzothienyl and thienyl moieties, in which a malononitrile group was substituted at the 5-position of the thienyl ring, was synthesized. This compound undergo a reversible electrocyclic rearrangement, generating strongly colored closed-ring isomer upon irradiation with UV-light which show nonfluorescence, while exposure to light in the visible range triggers the cycloreversion to the colorless open-ring form that exhibits strong fluorescence properties. This properties of molecular photochromism were developed that showed both photo switches and fluorescence switches. The erasable and rewritable photo-images on this photochromic diarylethene were successfully demonstrated. This developments are crucial for fundamental research and eventual technical application for high-density optical data storage.

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

2012 ◽  
Vol 583 ◽  
pp. 125-129 ◽  
Author(s):  
Xiao Ting Li ◽  
Hui Li ◽  
Gang Liu
Keyword(s):  
Thermal Stability ◽  
Uv Light ◽  
Amorphous Film ◽  
Optical Storage ◽  
Optical Recording ◽  
Strong Fluorescence ◽  
Good Thermal Stability ◽  
Closed Ring ◽  
Open Ring ◽  
Hexane Solution

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 and Properties of 1-[2-trifluoromethylpheny-2-[2-methyl-5-(3,5-difluorophenyl)-3-thienyl] perfluorocyclopentene

2013 ◽  
Vol 468 ◽  
pp. 75-78
Author(s):  
Guang Ming Liao ◽  
Shou Zhi Pu ◽  
Zhi Yuan Sun
Keyword(s):  
Absorption Band ◽  
Fluorescence Intensity ◽  
Emission Intensity ◽  
Uv Light ◽  
Fluorescent Properties ◽  
Visible Absorption ◽  
Photostationary State ◽  
Closed Ring ◽  
Open Ring

An asymmetrical photochromic diarylethene 1-[2-trifluoromethylpheny-2-[2-methyl-5-(3,5-difluorophenyl)-3-thienyperfluorocyclopentene (1o) was synthesized and its phtochromic, fluorescent properties in both solution and PMMA films were investigated in detail. This compound exhibited remarkable photochromism, upon irradiation with 297 nm UV light, the colorless solution of 1o turned to plum with a new visible absorption band centered at 544 nm (ε =3.75 × 103 L mol-1 cm-1) attributable to the closed-ring isomer 1c.The fluorescence intensity of diarylethene decreased dramatically along with the photochromism from open-ring isomer to closed-ring isomer in PMMA films and in hexane. The emission intensity of diarylethene 1o in a photostationary state was quenched to ca. 64% in hexane and 27% in PMMA films.

Synthesis, Photochromism Properties of a Hybrid Diarylethene Based on Hydroxyl Group

2011 ◽  
Vol 393-395 ◽  
pp. 385-388
Author(s):  
Duo Hua Jiang ◽  
Wei Jun Liu ◽  
Shi Qiang Cui ◽  
Gang Liu
Keyword(s):  
Visible Light ◽  
Uv Light ◽  
Amorphous Film ◽  
Methanol Solution ◽  
Fluorescence Properties ◽  
Hydroxyl Group ◽  
Pmma Film ◽  
Open Ring ◽  
Reversible Cyclization

A novel unsymmetrical diarylethene derivative 1-[2-methyl-5-(3-trifluoromethylphenyl)-3-thienyl]-2-[2-methyl-5-(4-hydroxylphenyl)-3-thienyl]hexafluorocyclopentene (1a) was successfully synthesized. The properties of the compound, including photochromic and fluorescence properties of the diarylethene were also investigated systematically. 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 593 nm in methanol and at 598 nm in PMMA amorphous film, respectively, upon irradiation with 297 nm UV light. In methanol solution, the open-ring isomer of the diarylethene 1 exhibited relatively fluorescence at 569 nm when excited at 360 nm.

Synthesis and Application of 1-(2-methyl-3-benzothienyl)-2-[3-methyl-2-thienyl]perfluorocyclopentene

2014 ◽  
Vol 1078 ◽  
pp. 102-105
Author(s):  
Gang Li ◽  
Gang Liu ◽  
Shou Zhi Pu
Keyword(s):  
Fluorescence Intensity ◽  
Uv Light ◽  
Optoelectronic Properties ◽  
Closed Ring ◽  
Fluorescence Switch ◽  
Open Ring ◽  
Hexane Solution

A novel unsymmetrical photochromic diarylethene compound 1-(2-methyl-3-benzothienyl)-2-[3-methyl-2-thienyl] perfluorocyclopentene was designed and constructed successfully. Its optoelectronic properties have been discussed systematically, such as photochromic, fluorescence switch, kinetics experiments in hexane solution and PMMA. The consequences showed that this compound exhibited good reversible photochromism. The maxima absorption of compound closed-ring isomer 1c is 468nm. Upon irradiation with 297nm UV light, Its fluorescence intensity decreased along with the photochromism from open-ring isomers to closed-ring isomers upon irradiation with 297 nm UV light.

Efficient Synthesis and Properties of a Photochromic Diarylethene Bearing Thiophene and Isoxazole Moieties

2011 ◽  
Vol 295-297 ◽  
pp. 1070-1073
Author(s):  
Hong Liang Liu ◽  
Gang Liu ◽  
Shi Qiang Cui ◽  
Wei Jun Liu
Keyword(s):  
Uv Light ◽  
Amorphous Film ◽  
Optical Storage ◽  
Efficient Synthesis ◽  
Fluorescent Properties ◽  
Strong Fluorescence ◽  
Closed Ring ◽  
Fluorescence Switch ◽  
Open Ring ◽  
Fluorescence Switching

A novel photochromic diarylethene based on isoxazole moiety was synthesized and its photochromic and fluorescent properties were also investigated. This compound exhibited reversible photochromism, changing from colorless to red after irradiation with UV light both in solution and in poly-methyl methacrylate (PMMA) amorphous film. Also, it exhibited remarkable fluorescence switching in the solid state. The results showed that the diarylethene exhibited a relatively strong fluorescence switch along with the photochromism from open-ring isomer to closed-ring isomer. Using this dithienylethene 1c as optical storage was performed successfully.

Research on Photochromic Materials with Synthesis and Application of 1-(2-methyl-3-benzothienyl)-2-[2-methyl-(5-ethynyl)trimethylsilane-3-thienyl] Perfluorocyclopentene

2014 ◽  
Vol 1003 ◽  
pp. 35-38
Author(s):  
Le Le Ma ◽  
Hong Yan Xu ◽  
Gang Liu
Keyword(s):  
Fluorescence Intensity ◽  
Fluorescence Spectra ◽  
Uv Light ◽  
Optoelectronic Properties ◽  
Closed Ring ◽  
Open Ring ◽  
Photochromic Materials ◽  
Hexane Solution

A new unsymmetrical photochromic diarylethene compound, 1-(2-methyl-3-benzothienyl)-2-(2-methyl-(5-ethynyl) trimethylsilane-3-thienyl) perfluorocyclopentene (1o) has been synthesized, and its optoelectronic properties, such as photochromism and the fluorescence spectra of diarylethene 1o in hexane solution was investigated. The results showed that this compound exhibited reversible photochromism in solution. The maxima absorption of compound closed-ring isomer 1c are 538 nm. Its fluorescence intensity decreased along with the photochromism from open-ring isomers to closed-ring isomers upon irradiation with 297 nm UV light.

Synthesis and Properties of 1,2-Bis[2-Methyl-5-(9,9-Dihexyl-Fluorene)-3-Thienyl]Perfluorocyclopentene

2014 ◽  
Vol 662 ◽  
pp. 103-106
Author(s):  
Le Le Ma ◽  
Gang Liu
Keyword(s):  
Visible Light ◽  
Fluorescence Intensity ◽  
Fluorescence Spectra ◽  
Uv Light ◽  
Optoelectronic Properties ◽  
Acetonitrile Solution ◽  
Closed Ring ◽  
Open Ring

A new symmetrical photochromic diarylethene 1,2-bis [2-methyl-5-(9,9-dihexyl-fluorene)-3-thienyl] perfluorocyclopentene (1o) has been synthesized, and its optoelectronic properties, such as photochromism and the fluorescence spectra of diarylethene 1o in acetonitrile solution was investigated. The maxima absorption of compound closed-ring isomer 1c is 619 nm. The open-ring isomer of the diarylethene 1o exhibited fluorescence at 390 nm. Its fluorescence intensity decreased along with the photochromism from open-ring isomers to closed-ring isomers upon irradiation with 297 nm UV light,The results showed that this compound exhibited reversible photochromism and fluorescent switching in solution after irradiation with UV light and visible light.

Synthesis, and Properties of 1-[2-methyl-5-(1,3-difluorophenyl)-3-thienyl]-2-[2-methyl-5-(4-methoxylphenyl)-3-thienyl]perfluorocyclopentene

2014 ◽  
Vol 952 ◽  
pp. 88-91
Author(s):  
Zhao Yan Tian ◽  
Feng Xia Sun ◽  
Shou Zhi Pu
Keyword(s):  
Visible Light ◽  
Phenyl Ring ◽  
Uv Light ◽  
Maximum Absorption ◽  
Methoxyl Group ◽  
Pmma Film ◽  
Ring Form ◽  
Hexane Solution

A new unsymmetrical photochromic diarylethene 1-[2-methyl-5-(1,3-difluorophenyl)-3-thienyl]-2-[2-methyl-5-(4-methoxylphenyl)-3-thienyl] perfluorocyclopentene has been synthesized,which a methoxyl group was substituted at the para-positions of the terminal phenyl ring. The photochromism of this compound 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 a PMMA film. When irradiated 297 nm UV light, in hexane solution the maximum absorption was observed at 289 nm and 588 nm in opening-ring form and in close-ring form, respectively.

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