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Shimizu K, Métivier R, Kobatake S. Synthesis and fluorescence on/off switching of hyperbranched polymers having diarylethene at the branching point. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2019.112341] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Sotome H, Une K, Nagasaka T, Kobatake S, Irie M, Miyasaka H. A dominant factor of the cycloreversion reactivity of diarylethene derivatives as revealed by femtosecond time-resolved absorption spectroscopy. J Chem Phys 2020; 152:034301. [PMID: 31968954 DOI: 10.1063/1.5134552] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Dynamics of the cycloreversion reaction of a photochromic diarylethene derivative with a small ring-opening reaction yield (∼1%) was investigated by using femtosecond transient absorption spectroscopy. The reaction rate constant and activation barrier on the reaction coordinate were quantitatively analyzed on the basis of the temperature and excitation wavelength dependencies of the reaction yield and excited state dynamics. From the comparison of the present results with those in a more reactive derivative, we concluded that a key factor regulating the overall reaction yield is the branching ratio at the conical intersection where the excited state population is split into the product and the initial reactant. The excitation wavelength dependence of the dynamics indicated that the geometrical relaxation and vibrational cooling proceed in a few picosecond time scale behind the cycloreversion process, and the vibrational excess energy assists the molecule to climb up the energy barrier.
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Seto Y, Yamada R, Kitagawa D, Kim D, Kobatake S. Photoluminescence ON/OFF Switching of CdSe/ZnS Core/Shell Quantum Dots Coated with Diarylethene Ligands. CHEM LETT 2019. [DOI: 10.1246/cl.190634] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Morimoto K, Tsujioka H, Kitagawa D, Kobatake S. Photoreversible Interference Color Modulation to Multicolor in Photochromic Molecular Crystals. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2019. [DOI: 10.1246/bcsj.20190114] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Noda S, Hasegawa S, Hamada H, Kobatake S, Imura K. Plasmon Enhanced Optical Responses of Diarylethene Molecules Adsorbed on Gold Nanorods. CHEM LETT 2019. [DOI: 10.1246/cl.190068] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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31
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Hirano A, Kitagawa D, Kobatake S. Photomechanical bending behavior of photochromic diarylethene crystals induced under polarized light. CrystEngComm 2019. [DOI: 10.1039/c9ce00175a] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The photoinduced bending velocity of photochromic diarylethene crystals depends on the polarization angle of UV light.
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Ishida S, Kitagawa D, Kobatake S, Kim S, Kurihara S, Fukaminato T. Efficient “turn-off” fluorescence photoswitching in a highly fluorescent diarylethene single crystal. Chem Commun (Camb) 2019; 55:5681-5684. [PMID: 31017136 DOI: 10.1039/c9cc02441g] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Efficient “turn-off” fluorescence photoswitching with full reversibility was successfully demonstrated in a fluorescent diarylethene single crystal.
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Sotome H, Kitagawa D, Nakahama T, Ito S, Kobatake S, Irie M, Miyasaka H. Cyclization reaction dynamics of an inverse type diarylethene derivative as revealed by time-resolved absorption and fluorescence spectroscopies. Phys Chem Chem Phys 2019; 21:8623-8632. [PMID: 30816903 DOI: 10.1039/c8cp07393g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Photocyclization reaction dynamics of an inverse type diarylethene derivative was investigated in alkane solutions by means of ultrafast laser spectroscopies. Femtosecond transient absorption spectroscopy showed that the Franck-Condon state formed by photoexcitation is geometrically relaxed to a transient species within 100 fs and subsequently the cyclization process takes place with a time constant of 36 ps. This time constant is much longer than those in normal type derivatives. Steady-state and time-resolved fluorescence measurements with the aid of quantum chemical calculations revealed that there exist three kinds of conformers, one parallel and two anti-parallel forms, in the ground state. One of the anti-parallel conformers undergoes the cyclization reaction, while the other two conformers are nonreactive species and their major relaxation processes are radiative decay and intersystem crossing into the triplet states. The triplet states thus formed no longer undergo the cyclization reaction in the late time region.
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Nakahama T, Kitagawa D, Sotome H, Fukaminato T, Ito S, Miyasaka H, Kobatake S. Fluorescence On/Off Switching in Nanoparticles Consisting of Two Types of Diarylethenes. ACS OMEGA 2018; 3:2374-2382. [PMID: 31458535 PMCID: PMC6641326 DOI: 10.1021/acsomega.8b00238] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Accepted: 02/14/2018] [Indexed: 06/10/2023]
Abstract
Single- and double-component nanoparticles consisting of two types of diarylethenes, 1,2-bis(3-methyl-5-phenyl-2-thienyl)perfluorocyclopentene (1a) and 1,2-bis(2-methyl-5-phenyl-3-thienyl)perfluorocyclopentene (2a), were fabricated by a reprecipitation method. Nanoparticles consisting of 1a exhibited orange or green fluorescence depending on the fabrication condition and did not undergo any photocyclization reaction. On the other hand, nanoparticles consisting of 2a underwent photoreversible photochromic reactions upon alternating irradiation with ultraviolet and visible light. Nanoparticles consisting of 1a and 2a exhibited fluorescence on/off switching with rapid switching speed and high on/off contrast, accompanying the photochromic reactions of 2a. The dependence of fluorescence on/off switching properties on Förster distance and molar fraction was observed and quantitatively evaluated by a simplified model.
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Kitagawa D, Tsujioka H, Tong F, Dong X, Bardeen CJ, Kobatake S. Control of Photomechanical Crystal Twisting by Illumination Direction. J Am Chem Soc 2018; 140:4208-4212. [PMID: 29451385 DOI: 10.1021/jacs.7b13605] [Citation(s) in RCA: 96] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Photomechanical molecular crystals have been investigated as mesoscopic photoactuators. Here, we report how the photomechanical twisting of 1,2-bis(2-methyl-5-phenyl-3-thienyl)perfluorocyclopentene (1a) crystals depends on illumination direction. The ribbon-like crystal of 1a could be successfully prepared by a sublimation method. The ribbon crystal exhibited reversible photomechanical crystal twisting upon alternating irradiation with ultraviolet (UV) and visible light. Moreover, changing the UV illumination direction with respect to the crystal resulted in different twisting modes, ranging from helicoid to cylindrical. Control of photomechanical crystal deformation by illumination direction provides a convenient and useful way to generate a variety of photomechanical motions from a single crystal.
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Nakahama T, Kitagawa D, Sotome H, Ito S, Miyasaka H, Kobatake S. Solid-State Fluorescence Behavior Induced by Photochemical Ring-Opening Reaction of 1,2-Bis(3-methyl-5-phenyl-2-thienyl)perfluorocyclopentene. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2018. [DOI: 10.1246/bcsj.20170322] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Tong F, Kitagawa D, Dong X, Kobatake S, Bardeen CJ. Photomechanical motion of diarylethene molecular crystal nanowires. NANOSCALE 2018; 10:3393-3398. [PMID: 29388653 DOI: 10.1039/c7nr09571f] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Crystalline nanowires composed of the photochromic diarylethene derivative 1,2-bis(2,4-dimethyl-5-phenyl-3-thienyl)perfluorocyclopentene (1a) are prepared and characterized. 200 nanometer diameter wires with a length of 60 microns are grown by slow solvent annealing in a porous anodic aluminum oxide template. The nanowires are oriented crystals, as determined by X-ray diffraction measurements, and can be liberated by dissolving the template in acid. They exhibit pronounced bending when exposed to ultraviolet light that can be reversed by visible light irradiation. The bending-unbending sequence can be repeated for more than 10 cycles without fatigue. This robustness results from the ability of the nanowires to maintain their crystallinity during the forward and reverse reactions. The small diameter of these nanowires allows them to achieve curvatures that are at least 40 times greater (200 mm-1versus 5 mm-1) than those observed for micron-thick diarylethene needles. This first demonstration of photomechanical nanostructures based on diarylethene photochromism opens up the possibility of making more complicated structures composed of this high-performance photochrome.
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Sotome H, Nagasaka T, Une K, Morikawa S, Katayama T, Kobatake S, Irie M, Miyasaka H. Cycloreversion Reaction of a Diarylethene Derivative at Higher Excited States Attained by Two-Color, Two-Photon Femtosecond Pulsed Excitation. J Am Chem Soc 2017; 139:17159-17167. [DOI: 10.1021/jacs.7b09763] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Nakahama T, Mukaiyama T, Kitagawa D, Kobatake S. Solvent effect of fluorescence on/off switching of diarylethene linked to excited-state intramolecular proton transfer fluorophore. RESEARCH ON CHEMICAL INTERMEDIATES 2017. [DOI: 10.1007/s11164-017-2928-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Sotome H, Nagasaka T, Une K, Okui C, Ishibashi Y, Kamada K, Kobatake S, Irie M, Miyasaka H. Efficient Cycloreversion Reaction of a Diarylethene Derivative in Higher Excited States Attained by Off-Resonant Simultaneous Two-Photon Absorption. J Phys Chem Lett 2017; 8:3272-3276. [PMID: 28677972 DOI: 10.1021/acs.jpclett.7b01388] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Off-resonant excitation of the closed-ring isomer of a photochromic diarylethene derivative at 730 nm induced the efficient cycloreversion reaction with a yield of ∼20%, while the reaction yield was only 2% under one-photon excitation at 365 nm. Excitation wavelength dependence of the one-photon cycloreversion reaction yield under steady-state irradiation in a wide wavelength range showed that the specific electronic state leading to the large cycloreversion reaction yield, which is originally forbidden in the optical transition but partially allowed owing to the low symmetry of the molecule, is spectrally overlapped with the electronic state accessible by the allowed one-photon optical transition in the UV region. Femtosecond transient absorption spectroscopy also revealed that the off-resonant two-photon excitation preferentially pumped the molecule into the specific state, leading to the 10-fold enhancement of the cycloreversion reaction.
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Shimizu K, Kobatake S. Synthesis and Optical Properties of Fluorescent Switchable Silica Nanoparticles Covered with Copolymers Consisting of Diarylethene and Fluorene Derivatives. ChemistrySelect 2017. [DOI: 10.1002/slct.201700698] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Ishida S, Fukaminato T, Kitagawa D, Kobatake S, Kim S, Ogata T, Kurihara S. Wavelength-selective and high-contrast multicolour fluorescence photoswitching in a mixture of photochromic nanoparticles. Chem Commun (Camb) 2017. [DOI: 10.1039/c7cc02938a] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Wavelength-selective and high-contrast multicolour fluorescence photoswitching was successfully demonstrated based on the nonlinear fluorescence quenching in photochromic nanoparticles.
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Kitagawa D, Kobatake S. Strategy for Molecular Design of Photochromic Diarylethenes Having Thermal Functionality. CHEM REC 2016; 16:2005-15. [DOI: 10.1002/tcr.201600060] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Indexed: 11/09/2022]
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44
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Kitagawa D, Tanaka R, Kobatake S. Photoinduced stepwise bending behavior of photochromic diarylethene crystals. CrystEngComm 2016. [DOI: 10.1039/c6ce00607h] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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45
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Nakahama T, Kitagawa D, Sotome H, Ito S, Miyasaka H, Kobatake S. Optical properties and solvatofluorochromism of fluorene derivatives bearing S,S-dioxidized thiophene. Photochem Photobiol Sci 2016; 15:1254-1263. [DOI: 10.1039/c6pp00126b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Fluorene derivatives having phenylthiophene or benzothiophene showed strong solvatofluorochromism by the oxidation of the thiophene ring.
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Kitagawa D, Kobatake S. Crystal thickness dependence of the photoinduced crystal bending of 1-(5-methyl-2-(4-(p-vinylbenzoyloxymethyl)phenyl)-4-thiazolyl)-2-(5-methyl-2-phenyl-4-thiazolyl)perfluorocyclopentene. Photochem Photobiol Sci 2015; 13:764-9. [PMID: 24618854 DOI: 10.1039/c3pp50417d] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Rod-like crystals of 1-(5-methyl-2-(4-(p-vinylbenzoyloxymethyl)phenyl)-4-thiazolyl)-2-(5-methyl-2-phenyl-4-thiazolyl)perfluorocyclopentene with lengths of over 1 mm showed photoreversible bending over 100 cycles upon irradiation with alternating ultraviolet (UV) and visible light. The crystals bent toward the incident light due to a contraction of the crystal length and a gradient of the crystal thickness, which depend on the extent of photoisomerization. It was observed that the bending speed depends on the crystal thickness, and the curvature change on changing the crystal thickness agrees well with Timoshenko's bimetal model, as well as with the observation that crystals of 1,2-bis(2-methyl-5-(4-(1-naphthoyloxymethyl)phenyl)-3-thienyl)perfluorocyclopentene bend away from the incident light due to an expansion of the crystal length and a gradient of the crystal thickness, which depend on the extent of photoisomerization. It was revealed that Timoshenko's bimetal model can be applied to photoinduced crystal bending behaviors caused by both contraction and expansion. These findings are very useful for evaluating and designing photomechanical actuators.
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Sugata E, Kobatake S. Synthesis and optical properties of gold nanoparticle networks cross-linked with chain-length-controlled polymers. RSC Adv 2015. [DOI: 10.1039/c5ra02264a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We synthesized gold nanoparticle networks by a cross-linking of gold nanoparticles with chain-length-controlled polymers having SH groups at both termini.
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Kitagawa D, Tanaka R, Kobatake S. Dependence of photoinduced bending behavior of diarylethene crystals on irradiation wavelength of ultraviolet light. Phys Chem Chem Phys 2015; 17:27300-5. [DOI: 10.1039/c5cp03073k] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A comprehensive mechanism for different photoresponsive bending behavior of diarylethene crystals depending on irradiation wavelength of ultraviolet light has been proposed.
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Ito S, Taga Y, Hiratsuka K, Takei S, Kitagawa D, Kobatake S, Miyasaka H. Restricted diffusion of guest molecules in polymer thin films on solid substrates as revealed by three-dimensional single-molecule tracking. Chem Commun (Camb) 2015. [DOI: 10.1039/c5cc03663a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
3D single-molecule tracking revealed that the translational diffusion of guest dyes in poly(2-hydroxyethyl acrylate) thin films on glass substrates was confined in a horizontal layer at a distance longer than 300–700 nm from the surface of the substrate.
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Kitagawa D, Kobatake S. Photoreversible current ON/OFF switching by the photoinduced bending of gold-coated diarylethene crystals. Chem Commun (Camb) 2015; 51:4421-4. [DOI: 10.1039/c5cc00355e] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Gold-coated diarylethene crystals exhibited photoreversible bending upon irradiation with UV and visible light without any breaking of the gold layer.
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