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Tanaka M, Okuda T, Itoh K, Ishihara N, Oguro A, Fujii-Kuriyama Y, Nabetani Y, Yamamoto M, Vogel CFA, Ishihara Y. Polycyclic aromatic hydrocarbons in urban particle matter exacerbate movement disorder after ischemic stroke via potentiation of neuroinflammation. Part Fibre Toxicol 2023; 20:6. [PMID: 36797786 PMCID: PMC9933276 DOI: 10.1186/s12989-023-00517-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Accepted: 02/07/2023] [Indexed: 02/18/2023] Open
Abstract
BACKGROUND A recent epidemiological study showed that air pollution is closely involved in the prognosis of ischemic stroke. We and others have reported that microglial activation in ischemic stroke plays an important role in neuronal damage. In this study, we investigated the effects of urban aerosol exposure on neuroinflammation and the prognosis of ischemic stroke using a mouse photothrombotic model. RESULTS When mice were intranasally exposed to CRM28, urban aerosols collected in Beijing, China, for 7 days, microglial activation was observed in the olfactory bulb and cerebral cortex. Mice exposed to CRM28 showed increased microglial activity and exacerbation of movement disorder after ischemic stroke induction. Administration of core particles stripped of attached chemicals from CRM28 by washing showed less microglial activation and suppression of movement disorder compared with CRM28-treated groups. CRM28 exposure did not affect the prognosis of ischemic stroke in null mice for aryl hydrocarbon receptor, a polycyclic aromatic hydrocarbon (PAH) receptor. Exposure to PM2.5 collected at Yokohama, Japan also exacerbated movement disorder after ischemic stroke. CONCLUSION Particle matter in the air is involved in neuroinflammation and aggravation of the prognosis of ischemic stroke; furthermore, PAHs in the particle matter could be responsible for the prognosis exacerbation.
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Affiliation(s)
- Miki Tanaka
- Program of Biomedical Science, Graduate School of Integrated Sciences for Life, Hiroshima University, 1-7-1, Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8521, Japan
- Laboratory for Pharmacotherapy and Experimental Neurology, Kagawa School of Pharmaceutical Sciences, Tokushima Bunri University, Sanuki, Kagawa, 769-2101, Japan
| | - Tomoaki Okuda
- Faculty of Science and Technology, Keio University, Yokohama, Kanagawa, 223-8522, Japan
| | - Kouichi Itoh
- Laboratory for Pharmacotherapy and Experimental Neurology, Kagawa School of Pharmaceutical Sciences, Tokushima Bunri University, Sanuki, Kagawa, 769-2101, Japan
| | - Nami Ishihara
- Program of Biomedical Science, Graduate School of Integrated Sciences for Life, Hiroshima University, 1-7-1, Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8521, Japan
| | - Ami Oguro
- Program of Biomedical Science, Graduate School of Integrated Sciences for Life, Hiroshima University, 1-7-1, Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8521, Japan
| | - Yoshiaki Fujii-Kuriyama
- Medical Research Institute, Molecular Epidemiology, Tokyo Medical and Dental University, Bunkyo, Tokyo, 113-8510, Japan
| | - Yu Nabetani
- Department of Applied Chemistry, Faculty of Engineering, University of Miyazaki, Miyazaki, 889-2192, Japan
| | - Megumi Yamamoto
- Department of Environment and Public Health, National Institute for Minamata Disease, Minamata, Kumamoto, 867-0008, Japan
| | - Christoph F A Vogel
- Department of Environmental Toxicology, University of California, Davis, Davis, CA, 95616, USA
- Center for Health and the Environment, University of California, Davis, Davis, CA, 95616, USA
| | - Yasuhiro Ishihara
- Program of Biomedical Science, Graduate School of Integrated Sciences for Life, Hiroshima University, 1-7-1, Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8521, Japan.
- Center for Health and the Environment, University of California, Davis, Davis, CA, 95616, USA.
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Kou Y, Nabetani Y, Nakazato R, Pratheesh NV, Sato T, Nozawa S, Adachi SI, Tachibana H, Inoue H. Mechanism of the photoreduction of carbon dioxide catalyzed by the benchmarking rhenium dimethylbipyridine complexes; operando measurements by XAFS and FT-IR. J Catal 2022. [DOI: 10.1016/j.jcat.2021.11.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Ramakrishnan V, Nabetani Y, Yamamoto D, Tachibana H, Inoue H. Heat trapping in a nano-layered microenvironment: estimation of temperature by thermal sensing molecules. Phys Chem Chem Phys 2020; 22:7201-7209. [PMID: 32141449 DOI: 10.1039/c9cp05817f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have previously found reversible photo-induced expansion and contraction of organic/inorganic clay hybrids, and even sliding of niobate nano-sheets at the macroscopic level of organic/inorganic niobate hybrids, induced by the molecular photo-isomerization of the polyfluoroalkylated azobenzene derivative (C3F-Azo-C6H) intercalated within the interlayer, which is viewed as an artificial muscle model unit. Based on systematic investigations of the steady state photo-isomerization and transient behavior of the reaction, we comprehended that the phenomena is caused by trapping of excess energy liberated during the isomerization, as well as the relaxation processes upon excitation of azobenzene chromophores in the interlayers of the hybrid. In this paper, quantitative estimation of transient 'heat' trapped in various microenvironments has been studied by each co-intercalation of temperature sensing dye molecules - rhodamine B (RhB) or tris(bipyridine)ruthenium(ii) chloride (Rubpy) with C3F-Azo-C6H within clay (SSA) nano-layers. The amount of dye molecules co-intercalated was kept to trace amounts that did not alter the bi-layered structure of the hybrid. The temperature of the microenvironment surrounding the probe molecules was estimated from the emission lifetime analysis. The evidently reduced emission lifetimes in C3F-Azo-C6H/SSA and C3H-Azo-C6H/SSA hybrids in the film state, indicated the elevation of temperature of the microenvironment upon excitation of the chromophores, which demonstrated our previous hypothesis rationalizing that the high reactivity of isomerization in the hybrid film state is caused by heat trapping via multi-step dissipation of the excess energy. With the hybrid of a hydrocarbon analogue (C3H-Azo-C6H), a distinct difference in temperature gradient was found to show the crucial role of the perfluoroalkyl chain of the surfactant that traps the excess energy to retard its dissipation leading to three-dimensional morphological motion.
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Affiliation(s)
- Vivek Ramakrishnan
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1, Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan.
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Hassan SZ, Nabetani Y, Matsumoto A, Shiragami T, Tong Z, Tachibana H, Inoue H. Synthesis of a photo-responsive single-walled nanoscroll and its photo-reactivity in a nano-layered microenvironment. Phys Chem Chem Phys 2019; 21:21738-21745. [PMID: 31475700 DOI: 10.1039/c9cp03835c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A photo-responsive nanoscroll composed of niobate nanosheets and a polyfluoroalkyl azobenzene derivative (C3F-Azo-C6H) is one of the most interesting layered materials because the reversible winding and unwinding motion could be efficiently induced by photo-irradiations. Previously, we have studied a double-walled nanoscroll (DWNS) of niobate that could be synthesized by the intercalation of a cationic polyfluorinated surfactant only into the interlayer I of the layered niobate among the two interlayers, I and II. In this study, we have successfully synthesized another novel photo-responsive single-walled nanoscroll (SWNS) of niobate by a stepwise guest-guest ion-exchange method. All niobate nanosheets that were exfoliated at both interlayers I and II were efficiently converted to nanoscrolls by the intercalation of C3F-Azo-C6H. The synthetic yield has been quantitatively estimated. Though the photo-isomerization reaction of C3F-Azo-C6H was induced in the SWNS, its photo-reactivity was the lowest when compared with those of the nanosheet-stacked film and the DWNS. The photo-reactivity of C3F-Azo-C6H decreased in the order of DWNS > nanosheet-stacked film > SWNS. The different flexibility of the layered miroenvironment might influence the photo-reactivity of C3F-Azo-C6H in the niobate hybrid. The SWNS exhibited a reversible expansion and shrinkage of its interlayer spaces upon photo-irradiation, while the winding and unwinding motion was not observed, contrary to the DWNS. The direction of the expansion and shrinkage of the interlayer of the SWNS was opposite to those of the nanosheet-stacked film and the DWNS. Based on the experimental results, the tilt angle of C3F-Azo-C6H against the nanosheet surface and the matching structures of the top and bottom surfaces of the nanosheet could be the probable key factors that control the photo-reactivity of C3F-Azo-C6H in the layered microenvironment; the morphological changes of the nano hybrids was also discussed.
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Affiliation(s)
- Syed Zahid Hassan
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan.
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Kuttassery F, Mathew S, Remello SN, Thomas A, Sano K, Ohsaki Y, Nabetani Y, Tachibana H, Inoue H. Alternative route to bypass the bottle-neck of water oxidation: Two-electron oxidation of water catalyzed by earth-abundant metalloporphyrins. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2018.08.027] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kuttassery F, Yamamoto D, Mathew S, Remello SN, Thomas A, Nabetani Y, Iwase A, Kudo A, Tachibana H, Inoue H. Photochemical hydrogen evolution on metal ion surface-grafted TiO2-particles prepared by sol/gel method without calcination. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2017.09.048] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Mathew S, Kuttassery F, Remello SN, Thomas A, Yamamoto D, Onuki S, Nabetani Y, Tachibana H, Inoue H. Two-Electron Oxidation of Water Through One-Photon Excitation of Aluminium Porphyrins: Molecular Mechanism and Detection of Key Intermediates. CHEMPHOTOCHEM 2017. [DOI: 10.1002/cptc.201700155] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Siby Mathew
- Center for Artificial Photosynthesis; Tokyo Metropolitan University; 1-1 Minami-Osawa Hachioji Tokyo 192-0397 Japan
| | - Fazalurahman Kuttassery
- Center for Artificial Photosynthesis; Tokyo Metropolitan University; 1-1 Minami-Osawa Hachioji Tokyo 192-0397 Japan
| | - Sebastian Nybin Remello
- Department of Applied Chemistry; Cochin University of Science and Technology; Kerala 682022 India
| | - Arun Thomas
- Center for Artificial Photosynthesis; Tokyo Metropolitan University; 1-1 Minami-Osawa Hachioji Tokyo 192-0397 Japan
| | - Daisuke Yamamoto
- Center for Artificial Photosynthesis; Tokyo Metropolitan University; 1-1 Minami-Osawa Hachioji Tokyo 192-0397 Japan
| | - Satomi Onuki
- Center for Artificial Photosynthesis; Tokyo Metropolitan University; 1-1 Minami-Osawa Hachioji Tokyo 192-0397 Japan
| | - Yu Nabetani
- Department of Applied Chemistry; University of Miyazaki; 1-1, Gakuen-Kibanadai-nishi Miyazaki city Miyazaki 889-2192 Japan
| | - Hiroshi Tachibana
- Center for Artificial Photosynthesis; Tokyo Metropolitan University; 1-1 Minami-Osawa Hachioji Tokyo 192-0397 Japan
| | - Haruo Inoue
- Center for Artificial Photosynthesis; Tokyo Metropolitan University; 1-1 Minami-Osawa Hachioji Tokyo 192-0397 Japan
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Kuttassery F, Mathew S, Sagawa S, Remello SN, Thomas A, Yamamoto D, Onuki S, Nabetani Y, Tachibana H, Inoue H. One Electron-Initiated Two-Electron Oxidation of Water by Aluminum Porphyrins with Earth's Most Abundant Metal. ChemSusChem 2017; 10:1909-1915. [PMID: 28322007 DOI: 10.1002/cssc.201700322] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Revised: 03/20/2017] [Indexed: 05/25/2023]
Abstract
We report herein a new molecular catalyst for efficient water splitting, aluminum porphyrins (tetra-methylpyridiniumylporphyrinatealuminum: AlTMPyP), containing earth's most abundant metal as the central ion. One-electron oxidation of the aluminum porphyrin initiates the two-electron oxidation of water to form hydrogen peroxide as the primary reaction product with the lowest known overpotential (97 mV). The aluminum-peroxo complex was detected by a cold-spray ionization mass-spectrometry in high-resolution MS (HRMS) mode and the structure of the intermediate species was further confirmed using laser Raman spectroscopy, indicating the hydroperoxy complex of AlTMPyP to be the key intermediate in the reaction. The two-electron oxidation of water to form hydrogen peroxide was essentially quantitative, with a Faradaic efficiency of 99 %. The catalytic reaction was found to be highly efficient, with a turnover frequency up to ∼2×104 s-1 . A reaction mechanism is proposed involving oxygen-oxygen bond formation by the attack of a hydroxide ion on the oxyl-radical-like axial ligand oxygen atom in the one-electron-oxidized form of AlTMPyP(O- )2 , followed by a second electron transfer to the electrode.
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Affiliation(s)
- Fazalurahman Kuttassery
- Department of Applied Chemistry, Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiohji, Tokyo, 192-0397, Japan
| | - Siby Mathew
- Department of Applied Chemistry, Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiohji, Tokyo, 192-0397, Japan
| | - Shogo Sagawa
- Department of Applied Chemistry, Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiohji, Tokyo, 192-0397, Japan
| | - Sebastian Nybin Remello
- Department of Applied Chemistry, Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiohji, Tokyo, 192-0397, Japan
| | - Arun Thomas
- Department of Applied Chemistry, Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiohji, Tokyo, 192-0397, Japan
| | - Daisuke Yamamoto
- Department of Applied Chemistry, Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiohji, Tokyo, 192-0397, Japan
| | - Satomi Onuki
- Department of Applied Chemistry, Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiohji, Tokyo, 192-0397, Japan
| | - Yu Nabetani
- Department of Applied Chemistry, Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiohji, Tokyo, 192-0397, Japan
| | - Hiroshi Tachibana
- Department of Applied Chemistry, Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiohji, Tokyo, 192-0397, Japan
| | - Haruo Inoue
- Department of Applied Chemistry, Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiohji, Tokyo, 192-0397, Japan
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Ramakrishnan V, Nabetani Y, Yamamoto D, Shimada T, Tachibana H, Inoue H. Trapping of excess energy in a nano-layered microenvironment to promote chemical reactions. Phys Chem Chem Phys 2017; 19:4734-4740. [PMID: 28128823 DOI: 10.1039/c6cp08414a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nano-layered hybrid compounds composed of a polyfluoroalkyl azobenzene surfactant (abbreviated as C3F-Azo-C6H) and layered inorganic nanosheets undergo three-dimensional morphological changes such as reversible shrinkage and expansion of interlayer spaces, and nanosheet sliding by photo-irradiation. Previously, we have investigated the photoreactivity of C3F-Azo-C6H/clay nano-layered hybrids in various microenvironments and found a remarkable enhancement in the photoreactivity for the cis-trans photo-isomerization reaction (Φcis-trans = 1.9). In this paper, nanosecond and microsecond dynamics of trans-C3F-Azo-C6H and its assembly in various microenvironments have been studied by laser flash photolysis to get deeper insight into the extraordinary reactivity of the molecular assembly in the nano-layered microenvironment. In solution, the molecular trans-C3F-Azo-C6H exhibited only a depletion of the trans-form of azobenzene upon the laser pulse excitation. On the other hand, in the case of the C3F-Azo-C6H/clay hybrid film, the depletion of the trans-form was drastically recovered in three steps on nano- and microsecond timescales. This indicates that the once reacted C3F-Azo-C6H molecule (cis-C3F-Azo-C6H) was reverted back to the trans-form after the laser pulse. It is considered that the excess energy provided by the photo-excitation, which is immediately dissipated to the surrounding media through the intermolecular vibrational modes in solution, is trapped in the nano-layered microenvironment to thermally revert the cis-form back to the trans-form. Conversely, in the case of cis-trans isomerization of the C3F-Azo-C6H/clay hybrid film upon photo-irradiation, the reactivity would be much enhanced by the additional contribution of the thermal excess energy efficiently trapped in the nano-layered microenvironment. As compared with the hydrocarbon analogue (C3H-Azo-C6H), the subsequent recovery was very much enhanced in the C3F-Azo-C6H/clay film. The polyfluoroalkyl part of the surfactant layer plays a key role in the retarded dissipation of the excess energy by photo-excitation, which might be coupled with the three-dimensional morphological motion with efficient isomerization reactions.
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Affiliation(s)
- V Ramakrishnan
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan.
| | - Y Nabetani
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan. and Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan
| | - D Yamamoto
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan. and Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan
| | - T Shimada
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan. and Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan
| | - H Tachibana
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan. and Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan
| | - H Inoue
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan. and Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan
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Thomas A, Kuttassery F, Remello SN, Mathew S, Yamamoto D, Onuki S, Nabetani Y, Tachibana H, Inoue H. Facile Synthesis of Water-Soluble Cationic Tin(IV) Porphyrins and Water-Insoluble Tin(IV) Porphyrins in Water at Ambient Temperature. BCSJ 2016. [DOI: 10.1246/bcsj.20160091] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Nabetani Y, Takamura H, Uchikoshi A, Hassan SZ, Shimada T, Takagi S, Tachibana H, Masui D, Tong Z, Inoue H. Photo-induced morphological winding and unwinding motion of nanoscrolls composed of niobate nanosheets with a polyfluoroalkyl azobenzene derivative. Nanoscale 2016; 8:12289-12293. [PMID: 27273772 DOI: 10.1039/c6nr02177h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Photo-responsive nanoscrolls can be successfully fabricated by mixing a polyfluoroalkyl azobenzene derivative and a niobate nanosheet, which is exfoliated from potassium hexaniobate. In this study, we have found that the photo-responsive nanoscroll shows a morphological motion of winding and unwinding, which is basically due to the nanosheet sliding within the nanoscroll, by efficient photo-isomerization reactions of the intercalated azobenzene in addition to the interlayer distance change of the nanoscrolls. The relative nanosheet sliding of the nanoscroll is estimated to be ca. 280 nm from the AFM morphology analysis. The distance of the sliding motion is over 20 times that of the averaged nanosheet sliding in the azobenzene/niobate hybrid film reported previously. Photo-responsive nanoscrolls can be expected to be novel photo-activated actuators and artificial muscle model materials.
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Affiliation(s)
- Yu Nabetani
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan.
| | - Hazuki Takamura
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan.
| | - Akino Uchikoshi
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan.
| | - Syed Zahid Hassan
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan.
| | - Tetsuya Shimada
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan.
| | - Shinsuke Takagi
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan.
| | - Hiroshi Tachibana
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan.
| | - Dai Masui
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan.
| | - Zhiwei Tong
- Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, People's Republic of China
| | - Haruo Inoue
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan.
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Remello SN, Kuttassery F, Hirano T, Nabetani Y, Yamamoto D, Onuki S, Tachibana H, Inoue H. Synthesis of water-soluble silicon-porphyrin: protolytic behaviour of axially coordinated hydroxy groups. Dalton Trans 2016; 44:20011-20. [PMID: 26526697 DOI: 10.1039/c5dt03654b] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new water-soluble silicon(IV)-tetra(4-carboxyphenyl)porphyrin (SiTCPP) with silicon(iv), the second most abundant element on Earth, in the center of porphyrin was synthesized. Fundamental properties including protolytic behaviour of axially coordinating hydroxy groups, and electrochemical behaviour were characterized. The properties were compared with those of silicon(IV)-tetra(2,4,6-trimethylphenyl)porphyrin (SiTMP) and silicon(IV)-tetra(4-trifluoromethylphenyl)porphyrin (SiTFMPP) and discussed in respect to the electron donating/withdrawing effect of the substituents. Two axially coordinating hydroxy groups of SiTCPP exhibit a four-step protolytic behaviour under the acidic conditions along with a single step protolysis of peripheral carboxyl groups. Though SiTCPP and SiTFMPP did not show any reactivity in the photochemical oxygenation of a substrate with K2PtCl6 as a sacrificial electron acceptor, the first oxidation wave in the electrochemical process of SiTCPP and SiTFMPP showed catalytic behaviour in aqueous acetonitrile solution at any pH condition, in contrast to SiTMP which has only a reversible oxidation wave under neutral and weakly acidic conditions. The criteria for the electrochemical oxidative activation of water and the photooxygenation of the substrate were obtained. The higher oxidation wave of Si-porphyrins than ∼0.86 volt vs. SHE is required for the electrochemical oxidation of water, while suitable protecting groups such as a methyl substituent is a requisite for the photochemical oxygenation with K2PtCl6 as a sacrificial electron acceptor.
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Affiliation(s)
- Sebastian Nybin Remello
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan.
| | - Fazalurahman Kuttassery
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan.
| | - Takehiro Hirano
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan.
| | - Yu Nabetani
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan.
| | - Daisuke Yamamoto
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan.
| | - Satomi Onuki
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan.
| | - Hiroshi Tachibana
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan.
| | - Haruo Inoue
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan.
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Nabetani Y, Uchikoshi A, Miyajima S, Hassan SZ, Ramakrishnan V, Tachibana H, Yamato M, Inoue H. Synthesis of double-wall nanoscrolls intercalated with polyfluorinated cationic surfactant into layered niobate and their magnetic alignment. Phys Chem Chem Phys 2016; 18:12108-14. [PMID: 27074750 DOI: 10.1039/c6cp01547f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The orientation of nanomaterials with an anisotropic nature such as nanoscrolls is very important for realizing their efficient and sophisticated functions in devices, including nanostructured electrodes in artificial photosynthetic cells. In this study, we successfully synthesized a nanoscroll by intercalation of a cationic polyfluorinated surfactant into the interlayer spaces of layered niobate and successfully controlled its orientation by applying an external magnetic field in water. The exfoliated niobate nanosheets were efficiently rolled-up to form nanoscrolls, which have a fine layered structure (d020 = 3.64 nm), by mixing with heptafluorobutanoylaminoethylhexadecyldimethylammonium bromide (C3F-S) in water, whereas the corresponding hydrocarbon analogue (C3H-S) did not form nanoscrolls. The synthetic yield for the purified and isolated nanoscrolls from the nanosheets was estimated to be 62% by weight. It was confirmed by atomic force microscopy (AFM) that most of the niobate nanosheets (98%) were converted to nanoscrolls. An external magnetic field was applied to the nanoscrolls to force them to align. After the magnetic treatment, the orientation of the nanoscrolls was investigated by small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM). The non-uniform ring distribution of the SAXS patterns indicates that the nanoscrolls dispersed in water were aligned well on applying the magnetic field. The long axis of the nanoscroll was oriented in the direction of the applied field and long nanoscrolls were aligned more efficiently. When the intercalated C3F-S molecules were removed from the nanoscrolls by treating with an acid, the resultant nanoscrolls did not exhibit magnetic alignment, strongly suggesting that C3F-S plays an important role in the orientation control of the nanoscrolls by the magnetic field.
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Affiliation(s)
- Yu Nabetani
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan. and Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan
| | - Akino Uchikoshi
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan.
| | - Souki Miyajima
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan.
| | - Syed Zahid Hassan
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan.
| | - Vivek Ramakrishnan
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan.
| | - Hiroshi Tachibana
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan. and Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan
| | - Masafumi Yamato
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan.
| | - Haruo Inoue
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan. and Center for Artificial Photosynthesis, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo 192-0397, Japan
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Mathew S, Kuttassery F, Yamamoto D, Onuki S, Nabetani Y, Tachibana H, Inoue H. One-Pot Facile Synthesis of Water-Soluble Cationic Aluminum(III) Porphyrins in a Unique Heterogeneous System at Ambient Temperature. BCSJ 2016. [DOI: 10.1246/bcsj.20150388] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Siby Mathew
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Center for Artificial Photosynthesis, Tokyo Metropolitan University
| | - Fazalurahman Kuttassery
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Center for Artificial Photosynthesis, Tokyo Metropolitan University
| | - Daisuke Yamamoto
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Center for Artificial Photosynthesis, Tokyo Metropolitan University
| | - Satomi Onuki
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Center for Artificial Photosynthesis, Tokyo Metropolitan University
| | - Yu Nabetani
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Center for Artificial Photosynthesis, Tokyo Metropolitan University
| | - Hiroshi Tachibana
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Center for Artificial Photosynthesis, Tokyo Metropolitan University
| | - Haruo Inoue
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Center for Artificial Photosynthesis, Tokyo Metropolitan University
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15
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Remello SN, Hirano T, Kuttassery F, Nabetani Y, Yamamoto D, Onuki S, Tachibana H, Inoue H. Visible light induced oxygenation of alkenes with water sensitized by silicon-porphyrins with the second most earth-abundant element. J Photochem Photobiol A Chem 2015. [DOI: 10.1016/j.jphotochem.2015.07.016] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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16
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Mathew S, Kuttassery F, Gomi Y, Yamamoto D, Kiyooka R, Onuki S, Nabetani Y, Tachibana H, Inoue H. Photochemical oxygenation of cyclohexene with water sensitized by aluminium(III) porphyrins with visible light. J Photochem Photobiol A Chem 2015. [DOI: 10.1016/j.jphotochem.2015.06.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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17
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Kou Y, Nabetani Y, Masui D, Shimada T, Takagi S, Tachibana H, Inoue H. Direct detection of key reaction intermediates in photochemical CO2 reduction sensitized by a rhenium bipyridine complex. J Am Chem Soc 2014; 136:6021-30. [PMID: 24689747 DOI: 10.1021/ja500403e] [Citation(s) in RCA: 117] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Photochemical CO2 reduction sensitized by rhenium-bipyridyl complexes has been studied through multiple approaches during the past several decades. However, a key reaction intermediate, the CO2-coordinated Re-bipyridyl complex, which should govern the activity of CO2 reduction in the photocatalytic cycle, has never been detected in a direct way. In this study on photoreduction of CO2 catalyzed by the 4,4'-dimethyl-2,2'-bipyridine (dmbpy) complex, [Re(dmbpy)(CO)3Cl] (1), we successfully detect the solvent-coordinated Re complex [Re(dmbpy)(CO)3DMF] (2) as the light-absorbing species to drive photoreduction of CO2. The key intermediate, the CO2-coordinated Re-bipyridyl complex, [Re(dmbpy)(CO)3(COOH)], is also successfully detected for the first time by means of cold-spray ionization spectrometry (CSI-MS). Mass spectra for a reaction mixture with isotopically labeled (13)CO2 provide clear evidence for the incorporation of CO2 into the Re-bipyridyl complex. It is revealed that the starting chloride complex 1 was rapidly transformed into the DMF-coordinated Re complex 2 through the initial cycle of photoreduction of CO2. The observed induction period in the time profile of the CSI-MS signals can well explain the subsequent formation of the CO2-coordinated intermediate from the solvent-coordinated Re-bipyridyl complex. An FTIR study of the reaction mixture in dimethyl sulfoxide clearly shows the appearance of a signal at 1682 cm(-1), which shifts to 1647 cm(-1) for the (13)CO2-labeled counterpart; this is assigned as the CO2-coordinated intermediate, Re(II)-COOH. Thus, a detailed understanding has now been obtained for the mechanism of the archetypical photochemical CO2 reduction sensitized by a Re-bipyridyl complex.
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Affiliation(s)
- Youki Kou
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University , 1-1 Minami-osawa, Hachioji, Tokyo 192-0397, Japan
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18
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Ramakrishnan V, Yamamoto D, Sasamoto S, Shimada T, Nabetani Y, Tachibana H, Inoue H. Remarkable enhancement of the photoreactivity of a polyfluoroalkyl azobenzene derivative in an organic–inorganic nano-layered microenvironment. Phys Chem Chem Phys 2014; 16:23663-70. [DOI: 10.1039/c4cp03549f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The quantum yield of photo-isomerization exceeds unity (Φ = 1.9) in an organic–inorganic nano-layered microenvironment.
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Affiliation(s)
- Vivek Ramakrishnan
- Department of Applied Chemistry
- Tokyo Metropolitan University
- Hachioji, Japan
| | - Daisuke Yamamoto
- Department of Applied Chemistry
- Tokyo Metropolitan University
- Hachioji, Japan
- Center for artificial photosynthesis
- Tokyo Metropolitan University
| | - Shin Sasamoto
- Department of Applied Chemistry
- Tokyo Metropolitan University
- Hachioji, Japan
| | - Tetsuya Shimada
- Department of Applied Chemistry
- Tokyo Metropolitan University
- Hachioji, Japan
- Center for artificial photosynthesis
- Tokyo Metropolitan University
| | - Yu Nabetani
- Department of Applied Chemistry
- Tokyo Metropolitan University
- Hachioji, Japan
- Center for artificial photosynthesis
- Tokyo Metropolitan University
| | - Hiroshi Tachibana
- Department of Applied Chemistry
- Tokyo Metropolitan University
- Hachioji, Japan
- Center for artificial photosynthesis
- Tokyo Metropolitan University
| | - Haruo Inoue
- Department of Applied Chemistry
- Tokyo Metropolitan University
- Hachioji, Japan
- Center for artificial photosynthesis
- Tokyo Metropolitan University
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Kurimoto K, Yamazaki T, Suzuri Y, Nabetani Y, Onuki S, Takagi S, Shimada T, Tachibana H, Inoue H. Hydrogen evolution coupled with the photochemical oxygenation of cyclohexene with water sensitized by tin(iv) porphyrins by visible light. Photochem Photobiol Sci 2014; 13:154-6. [DOI: 10.1039/c3pp50271f] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Nabetani Y, Takamura H, Hayasaka Y, Sasamoto S, Tanamura Y, Shimada T, Masui D, Takagi S, Tachibana H, Tong Z, Inoue H. An artificial muscle model unit based on inorganic nanosheet sliding by photochemical reaction. Nanoscale 2013; 5:3182-93. [PMID: 23471173 DOI: 10.1039/c3nr34308a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
From the viewpoint of developing photoresponsive supramolecular systems in microenvironments to exhibit more sophisticated photo-functions even at the macroscopic level, inorganic/organic hybrid compounds based on clay or niobate nanosheets as the microenvironments were prepared, characterized, and examined for their photoreactions. We show here a novel type of artificial muscle model unit having much similarity with that in natural muscle fibrils. Upon photoirradiation, the organic/inorganic hybrid nanosheets reversibly slide horizontally on a giant scale, and the interlayer spaces in the layered hybrid structure shrink and expand vertically. In particular, our layered hybrid molecular system exhibits a macroscopic morphological change on a giant scale (~1500 nm) compared with the molecular size of ~1 nm, based on a reversible sliding mechanism.
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Affiliation(s)
- Yu Nabetani
- Department of Applied Chemistry, Tokyo Metropolitan University, 1-1, Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan.
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21
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Han WS, Wee KR, Kim HY, Pac C, Nabetani Y, Yamamoto D, Shimada T, Inoue H, Choi H, Cho K, Kang SO. Hydrophilicity Control of Visible-Light Hydrogen Evolution and Dynamics of the Charge-Separated State in Dye/TiO2/Pt Hybrid Systems. Chemistry 2012; 18:15368-81. [DOI: 10.1002/chem.201201500] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2012] [Revised: 08/13/2012] [Indexed: 11/11/2022]
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22
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Shimada T, Kumagai A, Funyu S, Takagi S, Masui D, Nabetani Y, Tachibana H, Tryk DA, Inoue H. How is the water molecule activated on metalloporphyrins? Oxygenation of substrates induced through one-photon/two-electron conversion in artificial photosynthesis by visible light. Faraday Discuss 2012; 155:145-63; discussion 207-22. [DOI: 10.1039/c1fd00069a] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Nabetani Y, Takamura H, Hayasaka Y, Shimada T, Takagi S, Tachibana H, Masui D, Tong Z, Inoue H. A Photoactivated Artificial Muscle Model Unit: Reversible, Photoinduced Sliding of Nanosheets. J Am Chem Soc 2011; 133:17130-3. [DOI: 10.1021/ja207278t] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yu Nabetani
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan, and SORST, Japan Science and Technology (JST)
| | - Hazuki Takamura
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan, and SORST, Japan Science and Technology (JST)
| | - Yuika Hayasaka
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan, and SORST, Japan Science and Technology (JST)
| | - Tetsuya Shimada
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan, and SORST, Japan Science and Technology (JST)
| | - Shinsuke Takagi
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan, and SORST, Japan Science and Technology (JST)
| | - Hiroshi Tachibana
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan, and SORST, Japan Science and Technology (JST)
| | - Dai Masui
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan, and SORST, Japan Science and Technology (JST)
| | - Zhiwei Tong
- Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, People’s Republic of China
| | - Haruo Inoue
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan, and SORST, Japan Science and Technology (JST)
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24
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Inoue H, Shimada T, Kou Y, Nabetani Y, Masui D, Takagi S, Tachibana H. The water oxidation bottleneck in artificial photosynthesis: how can we get through it? An alternative route involving a two-electron process. ChemSusChem 2011; 4:173-179. [PMID: 21271684 DOI: 10.1002/cssc.201000385] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2010] [Indexed: 05/30/2023]
Abstract
The state-of-the-art of research on artificial photosynthesis is briefly reviewed. Insights into how Nature takes electrons from water, the photon-flux density of sunlight, the time scale for the arrival of the next photon (electron-hole) at the oxygen-evolving complex, how Nature solves the photon-flux-density problem, and how we can get through the bottleneck of water oxidation are discussed. An alternate route for a two-electron process induced by one-photon excitation is postulated for getting through the bottleneck of water oxidation.
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Affiliation(s)
- Haruo Inoue
- SORST/JST, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiohji, Tokyo 192-0397, Japan.
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Nabetani Y, Yoshikawa H, Grimsdale AC, Müllen K, Masuhara H. Effects of optical trapping and liquid surface deformation on the laser microdeposition of a polymer assembly in solution. Langmuir 2007; 23:6725-9. [PMID: 17474761 DOI: 10.1021/la063341k] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
A polymer microassembly is formed by focusing a near-infrared (NIR) laser beam in a thin film of a polymer solution. We have investigated the mechanism of laser microdeposition of a polyfluorene assembly by measuring the surface deformation of the solution film and the morphology of the deposited assembly. It is clearly observed that a rupture is formed at the laser focus in the solution film by using laser interferometric imaging. The time necessary for the rupture formation and the volume of the deposited microassembly are analyzed as a function of laser power. Experimental results suggest that the solution surface deformation induced by local laser heating and optical trapping effects determined the volume of the laser microdeposition. By combining this method with multiple optical trapping, a polymer microassembly with a polygonal morphology is formed on the glass substrate.
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Affiliation(s)
- Yu Nabetani
- Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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Nabetani Y, Yoshikawa H, Masuhara H. Selective Optical Trapping and Deposition of Polymer and Aromatic Molecules from Binary Mixed Solution. J Phys Chem B 2006; 110:21399-402. [PMID: 17064084 DOI: 10.1021/jp065628w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have demonstrated size-selective optical trapping and deposition of polymer and aromatic molecules from binary mixed solution. As a near-infrared laser beam is tightly focused in polystyrene and perylene mixed solution and dropped on a glass substrate, a molecular assembly is deposited at the laser focus and fixed on the substrate. The fluorescence spectrum of the deposited microassembly depends on the laser power; perylene monomer fluorescence is dominant in the case of high laser power, whereas excimer emission of perylene crystal is observed in the case of low laser power. This suggests that polystyrene molecules are preferentially deposited by focusing a higher laser power so that the ratio of polystyrene and perylene in the assembly can be controlled by laser power. This mechanism can be explained in view of the molecular size selectivity in optical trapping.
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Affiliation(s)
- Yu Nabetani
- Department of Applied Physics, Graduate School of Engineering, Osaka University, Yamada-oka 2-1, Suita, Osaka, 565-0861, Japan
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Nabetani Y, Ito Y, Kamisawa K, Kato T, Matsumoto T, Hirai T. Composition control of ZnSSeO quaternary alloys grown on GaP. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/pssc.200564698] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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28
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Nabetani Y, Okuno T, Aoki K, Kato T, Matsumoto T, Hirai T. Photoluminescence properties of ZnTeO and ZnSeO alloys with dilute O concentrations. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/pssc.200564697] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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