A new photochromic diarylethene compound [1-(2-methyl-1-naphthyl), 2-(2-methyl-5-(2-1,3-dioxolanephenyl)-3-
thienyl)]perfluorocyclopentene 1o, and its photochromic properties, fluorescence switch and kinetic properties were
investigated in detail. Diarylethene 1o changed the color from colorless to red when irraditated with 297 nm UV light,
which the absorption maxima were observed at 503 nm in hexane solution. This new photochromic system also showed
remarkable fluorescence switching in the solid state. Finally, using this diarylethene as recording medium, polarization
optical recording was carried out successfully.
A novel unsymmetrical photochromic diarylethene bearing a benzothiazole unit, 1-[ (2,5-dimethyl-3-thienyl) ]-2-[(2-methyl-5-(2-benzothiazole)-3-thienyl)]perfluoroyclopentene (1O) have been synthesized. Its photochromic, fluorescence and optical strorage properties were investigated. The compound exhibited obviously photochromism both in hexane and in PMMA film. In hexane, the fluorescence intensity of 1O declined along with the photochromism upon irradiation with 297 nm light. This new photochromic system also exhibited remarkable optical storage characters.
A new unsymmetrical photochromic diarylethene 1-(2-methylthiophene-3-yl)-2-[(2-n-butyl-5-formyl)thiophene-3-yl]perfluoroncyclopentene(1a), 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 1b/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.
An unsymmetrical diarylethene derivative 1-(2,5-dimethyl-3-thienyl)-2-[2-methyl-5-(4-hydroxylphenyl)-3-
thienyl]hexafluorocyclopentene (1a) 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 547 nm in hexane and at 554 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 hexane. In hexane the open-ring isomer of the diarylethene 1 exhibited relatively fluorescence at 507
nm when excited at 375 nm. This new photochromic compound also exhibited remarkable optical storage character.
A novel photochromic diarylethene based on benzofuran moiety and a chlorine atom was synthesized, and its
photochromic and fluorescent properties were investigated. This compound exhibited reversible photochromism,
changing from colorless to violet after irradiation with UV light both in solution and in poly-methyl methacrylate
(PMMA) amorphous film. Also, it exhibited remarkable fluorescence switching in PMMA film. The results indicated
that the benzofuran moiety played a very important role during the process of photochromic reaction for the diarylethene
derivative. Using this diarylethene 1c/PMMA as optical storage was performed successfully.
A new unsymmetrical photochromic diarylethene compound,
[1-(2-methyl-5-phenyl-3-thienyl),2-(2-methyl-5-(2-pyridyl)-3-thienyl)]perfluorocyclopentene (1a), was synthesized and its photochemical properties, such as
photochromism and kinetics in solution as well as in PMMA amorphous film, electrochemical properties and optical
strorage properties were investigated in detail. The results showed that the cyclization/cycloreversion process of the
compound was determined to be the zeroth/first order reaction, the electrochemical properties suggests that the
diarylethene derivative can be used as an electrochemical switch and electrochemistry data storage, and the optical
propertis can be potential use for data storage.
Photochromic symmetrical diarylethenes derivatives 1a-4a bearing different long alkyl chains at 2-position of thiophene
rings have been synthesized and their photochromism and kinetics of the photochromic cyclization/cycloreversion both
in hexane and in PMMA film were investigated. The results showed that the cyclization/cycloreversion process of these
compounds were determined to be the zeroth/first order reaction, and the different long alkyl chains effects on kinetics
according to the data of reaction rates both in hexane and PMMA film.
A series of photochromic diarylethenes compounds were synthesized and the electrochemistry and electrochemistry
reaction mechanism properties were investigated. The cyclic voltammetry tests demonstrated that the colorless open-ring
isomers were assigned to the unique oxidation process, but the color closed-ring isomers of these compounds were
assigned to two oxidation processes. In addition, the electrochromism of diarylethene compound is observed in solution:
The closed-ring reaction can be triggered by electrochemical oxidation, while the open-ring reaction must be
photochemically driven. These oxidation processes properties can be useful as the oxidation processes electrochemical
switching and the oxidation electrochemical switching properties of these different diarylethene isomers can be potential
for electrochemistry data storages.
A symmetrical photochromic diarylethene, 1,2-bis[5-(3,5-difluorophenyl)-2-methyl-3-thienyl]-3,3,4,4,5,5-
hexafluorocyclopent- 1-ene (1a), was synthesized, and its photochromic and fluorescent properties were also
investigated. 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. In hexane solution, the open-ring
isomer of the diarylethene 1 exhibited relatively strong fluorescence at 350 nm when excited at 280 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.
A new photochromic diarylethene compound, 1-[2-methyl-5-(3-methoxylphenyl)-3-thienyl]-2-[2-methyl-5-(3-
trifluoromethylphenyl)-3-thienyl]perfluorocyclopentene (1a), was synthesized and its photochromism and photo-induced
anisotropy was investigated. It showed good photochromism both in solution and PMMA amorphous film by photoirradiation.
In hexane, the colorless solution turned to blue with a new broad absorption band centered at 579 nm upon
irradiation with 254 nm UV light. The blue colored solution returned to colorless upon irradiation with visible light (λ >
500 nm). The open-ring isomer of 1a exhibited relatively strong fluorescence at 352 nm when excited at 295 nm in
hexane. In PMMA film, diarylethene 1a also showed good photochromism. In addition, the result indicated that the
compound showed a photoinduced anisotropic phenomenon accompanying the photochromic reaction, which illustrated
that the diarylethene can be potentially used as polarization multiplexed image recording medium.
A new photochromic diarylethene bearing a six-membered aryl unit, 1-(2-methyl-5-pheny-3-thienyl)-2-(2-methyl-4-
pheny-phenyl)perfluorocyclopentene (1a), was synthesized and its photochromic and fluorescent properties were
investigated. Diarylethene 1a changed the color from colorless to violet upon irradiation with 313 nm UV light, in which
absorption maxima were observed at 554 nm in hexane and at 578 nm in PMMA film, respectively. This new
photochromic system also exhibited remarkable fluorescence switching in the solid state. Finally, rewritable holographic
optical storage using 1a was performed. The results demonstrated that the compound was very sensitive responding to
633 nm recording laser, and the recorded holographic images have good contrast.
Five new photochromic unsymmetrical diarylethenes bearing different substitutes have been synthesized. Substituent
effects on their optoelectronic properties, including photochromism, fluorescence properties were investigated in detail.
The strong electron-donating substituents have effective contributions to the absorption maxima of the closed-ring
isomers and the molar coefficients, while the electron-withdrawing substituents can shift significantly the absorption
maxima of the diarylethenes to a longer wavelength and increase their cyclization quantum yield. In addition, these
diarylethenes exhibited different color (red, purple, blue and green) both in solution and in PMMA film with alternating
irradiation by UV/vis light, which can be potentially applied in the devices of full-color display.
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