1
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Nakanishi K, Lugo-Fuentes LI, Manabe J, Guo R, Kikkawa S, Yamazoe S, Komaguchi K, Kume S, Szczepanik DW, Solà M, Jimenez-Halla JOC, Nishihara S, Kubo K, Nakamoto M, Yamamoto Y, Mizuta T, Shang R. Redox Activity of Ir III Complexes with Multidentate Ligands Based on Dipyrido-Annulated N-Heterocyclic Carbenes: Access to High Valent and High Spin State with Carbon Donors. Chemistry 2023; 29:e202302303. [PMID: 37553318 DOI: 10.1002/chem.202302303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 08/08/2023] [Accepted: 08/08/2023] [Indexed: 08/10/2023]
Abstract
Synthetic strategies to access high-valent iridium complexes usually require use of π donating ligands bearing electronegative atoms (e. g. amide or oxide) or σ donating electropositive atoms (e. g. boryl or hydride). Besides the η5 -(methyl)cyclopentadienyl derivatives, high-valent η1 carbon-ligated iridium complexes are challenging to synthesize. To meet this challenge, this work reports the oxidation behavior of an all-carbon-ligated anionic bis(CCC-pincer) IrIII complex. Being both σ and π donating, the diaryl dipyrido-annulated N-heterocyclic carbene (dpa-NHC) IrIII complex allowed a stepwise 4e- oxidation sequence. The first 2e- oxidation led to an oxidative coupling of two adjacent aryl groups, resulting in formation of a cationic chiral IrIII complex bearing a CCCC-tetradentate ligand. A further 2e- oxidation allowed isolation of a high-valent tricationic complex with a triplet ground state. These results close a synthetic gap for carbon-ligated iridium complexes and demonstrate the electronic tuning potential of organic π ligands for unusual electronic properties.
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Affiliation(s)
- Kazuki Nakanishi
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan
| | - Leonardo I Lugo-Fuentes
- Department of Chemistry, Division of Natural and Exact Sciences, University of Guanajuato, Campus Gto, Noria Alta s/n, 36050, Guanajuato, Mexico
| | - Jun Manabe
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan
| | - Ronghao Guo
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan
| | - Soichi Kikkawa
- Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan
| | - Seiji Yamazoe
- Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan
| | - Kenji Komaguchi
- Department of Applied Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, 739-8527, Japan
| | - Shoko Kume
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan
| | - Dariusz W Szczepanik
- K. Guminski Department of Theoretical Chemistry, Faculty of Chemistry, Jagiellonian University, Gronostajowa, 2, 30-387, Kraków, Poland
| | - Miquel Solà
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, C/Maria Aurèlia Capmany, 69, 17003, Girona, Catalonia, Spain
| | - J Oscar C Jimenez-Halla
- Department of Chemistry, Division of Natural and Exact Sciences, University of Guanajuato, Campus Gto, Noria Alta s/n, 36050, Guanajuato, Mexico
| | - Sadafumi Nishihara
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan
| | - Kazuyuki Kubo
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan
| | - Masaaki Nakamoto
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan
| | - Yohsuke Yamamoto
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan
| | - Tsutomu Mizuta
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan
| | - Rong Shang
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan
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2
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Islam ATMR, Shinzato K, Miyaoka H, Komaguchi K, Koike K, Arakawa K, Kitamura K, Tanaka N. Isolation and characterization of blackish-brown BY2-melanin accumulated in cultured tobacco BY-2 cells. Biosci Biotechnol Biochem 2023; 87:395-410. [PMID: 36592962 DOI: 10.1093/bbb/zbac214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2022] [Accepted: 12/21/2022] [Indexed: 01/04/2023]
Abstract
The tobacco BY-2 cell line is one of the most utilized plant cell lines. After long-term culture, the cells turn brown to black, but the causal pigment is unknown. We successfully isolated a blackish-brown pigment from BY-2 cells cultured for 3 weeks. Morphological and spectroscopic analyses indicated that the pigment had similar features to a melanin-like substance reported previously. Furthermore, physicochemical analyses revealed that this pigment possessed most of the properties of melanin-like pigments. In addition, the high nitrogen content suggested that it differed from common plant melanins classified as allomelanins, suggesting a novel eumelanin-like pigment: "BY2-melanin". This is the first example showing that eumelanin-like pigments are produced in the cultures of plant cells for which the accumulation of melanin has not been reported. This tobacco BY-2 cell culture technique may represent a customizable and sustainable alternative to conventional melanin production platforms, with significant potential for industrial and pharmacological applications.
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Affiliation(s)
- Abul Taher Mohammed Rafiqul Islam
- Genome Biotechnology, Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
- Department of Botany, Faculty of Biosciences, University of Barishal, Barishal 8254, Bangladesh
| | - Keita Shinzato
- Advanced Materials Division, Natural Science Center for Basic Research and Development, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
| | - Hiroki Miyaoka
- Advanced Materials Division, Natural Science Center for Basic Research and Development, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
| | - Kenji Komaguchi
- Materials Analytical Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
| | - Kanae Koike
- Facility Management Division, Natural Science Center for Basic Research and Development, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
| | - Kenji Arakawa
- Cell Biochemistry, Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
| | - Kenji Kitamura
- Genome Biotechnology, Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
- Department of Gene Science, Natural Science Center for Basic Research and Development, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
| | - Nobukazu Tanaka
- Genome Biotechnology, Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
- Department of Gene Science, Natural Science Center for Basic Research and Development, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
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3
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Tadano W, Tanabe E, Stellhorn JR, Komaguchi K, Hayakawa S. Density estimations and comparisons of a fragmented single fiber using X-ray computed tomography. ANAL SCI 2023; 39:235-240. [PMID: 36418842 DOI: 10.1007/s44211-022-00225-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2022] [Accepted: 11/17/2022] [Indexed: 11/25/2022]
Abstract
A commercial X-ray computed tomography (CT) apparatus using a quasi-monochromatic beam was utilized for density estimations and comparisons of a fragmented single fiber. The validation of quasi-monochromaticity of the X-ray source was investigated by radiograph measurements. For the case of a transmittance higher than 50%, the contribution of Cu Kα characteristic X-rays was dominant. To realize a sufficient statistical quality, an attempt to increase the number of averaged voxels was demonstrated using the neighboring slices of the 3D-CT image. A minimum value of the coefficient of variation (CV) was achieved using multiple images rather than using a single image. The observed values of the inverse of the transmitted X-ray intensity (CT value) of the polymers showed a fairly good relationship with their density. An analytical curve derived from measurements of reference samples of known densities could provide the relative density of an unknown fragmented fiber down to the size of 30 μm in diameter and 35 μm in length. The CV of the estimated density was from 1.5 to 2%, which was estimated from the CV of CT values. Moreover, the correlation of CT values was improved with the linear absorption coefficient than the density. A better performance of discrimination of polymers including fibers might be realized with the difference of linear absorption coefficients for X-rays.
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Affiliation(s)
- Wataru Tadano
- Forensic Science Laboratory, Hiroshima Prefectural Police H.Q, 2-26-3 Konan, Naka, Hiroshima, 730-0825, Japan. .,Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, 739-8527, Japan.
| | - Eishi Tanabe
- West Region Industrial Research Center, Hiroshima Prefectural Technology Research Institute, 3-13-26 Kagamiyama, Higashi-Hiroshima, 739-0046, Japan
| | - Jens R Stellhorn
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, 739-8527, Japan.,Applied Chemistry Program, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, 739-8527, Japan
| | - Kenji Komaguchi
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, 739-8527, Japan.,Applied Chemistry Program, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, 739-8527, Japan
| | - Shinjiro Hayakawa
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, 739-8527, Japan. .,Applied Chemistry Program, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, 739-8527, Japan.
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4
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Tanaka R, Sogo K, Komaguchi K, Ae K, Nakayama Y, Shiono T. Impact of Methylaluminoxane Oxidation on Ethylene Polymerization Using Ni Catalysts. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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)
- Ryo Tanaka
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Kenji Sogo
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Kenji Komaguchi
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Kazuki Ae
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Yuushou Nakayama
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Takeshi Shiono
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
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5
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Sugiyama M, Akiyama M, Yonezawa Y, Komaguchi K, Higashi M, Nozaki K, Okazoe T. Electron in a cube: Synthesis and characterization of perfluorocubane as an electron acceptor. Science 2022; 377:756-759. [PMID: 35951682 DOI: 10.1126/science.abq0516] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Fluorinated analogs of polyhedral hydrocarbons have been predicted to localize an electron within their cages upon reduction. Here, we report the synthesis and characterization of perfluorocubane, a stable polyhedral fluorocarbon. The key to the successful synthesis was the efficient introduction of multiple fluorine atoms to cubane by liquid-phase reaction with fluorine gas. The solid-state structure of perfluorocubane was confirmed using x-ray crystallography, and its electron-accepting character was corroborated electrochemically and spectroscopically. The radical anion of perfluorocubane was examined by matrix-isolation electron spin resonance spectroscopy, which revealed that the unpaired electron accepted by perfluorocubane is located predominantly inside the cage.
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Affiliation(s)
- Masafumi Sugiyama
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Midori Akiyama
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Yuki Yonezawa
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kenji Komaguchi
- Department of Applied Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan
| | - Masahiro Higashi
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Kyoko Nozaki
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Takashi Okazoe
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.,AGC Inc., Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
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6
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Tadano W, Takeuchi M, Tanabe E, Stellhorn JR, Komaguchi K, Nakamoto A, Honda S, Hayakawa S. Non-destructive analysis of hollow-shaped single fibers using X-ray computed tomography. J Forensic Sci 2022; 67:1461-1467. [PMID: 35521892 DOI: 10.1111/1556-4029.15055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Revised: 04/23/2022] [Accepted: 04/25/2022] [Indexed: 11/28/2022]
Abstract
A commercial high-resolution X-ray computed tomography (CT) was utilized for non-destructive analysis of single fibers. The micro-CT apparatus was employed because it is applicable to both colored and colorless fibers. A sample preparation using adhesive sheets was demonstrated, and the method is similar to typical tape-lift sample collection method in crime cases. Different cross-sectional shapes of nylon and polyester single fibers were non-destructively distinguished, and the method is applicable to all types of fibers. Cross-sectional areas, aperture ratios, and volumes of individual fibers were directly and automatically measured using the open-source software. The observed parameters were within a coefficient of variation of 3%. In addition, a mass of a single fragment of a fiber can be estimated when the local density is given.
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Affiliation(s)
- Wataru Tadano
- Forensic Science Laboratory, Hiroshima Prefectural Police H.Q, Hiroshima, Japan.,Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Hiroshima, Japan
| | - Masaru Takeuchi
- Forensic Science Laboratory, Hiroshima Prefectural Police H.Q, Hiroshima, Japan
| | - Eishi Tanabe
- West Region Industrial Research Center, Hiroshima Prefectural Technology Research Institute, Hiroshima, Japan
| | - Jens R Stellhorn
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Hiroshima, Japan.,Applied Chemistry Program, Graduate School of Advanced Science and Engineering, Hiroshima University, Hiroshima, Japan
| | - Kenji Komaguchi
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Hiroshima, Japan.,Applied Chemistry Program, Graduate School of Advanced Science and Engineering, Hiroshima University, Hiroshima, Japan
| | - Akihiro Nakamoto
- Forensic Science Laboratory, Hiroshima Prefectural Police H.Q, Hiroshima, Japan
| | - Sadao Honda
- Japan Synchrotron Radiation Research Institute, Hyogo, Japan
| | - Shinjiro Hayakawa
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Hiroshima, Japan.,Applied Chemistry Program, Graduate School of Advanced Science and Engineering, Hiroshima University, Hiroshima, Japan
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7
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Tadano W, Tanabe E, Stellhorn JR, Komaguchi K, Takeuchi M, Hayakawa S. Feasibility Studies of X-Ray Computed Tomography for Forensic Examination of Single Fibers. ANAL SCI 2021; 37:1401-1406. [PMID: 33746141 DOI: 10.2116/analsci.21p031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Non-destructive observations of cross-sectional shapes of acrylic single fibers using X-ray computed tomography (CT) were performed. A commercial X-ray CT apparatus (Rigaku nano3DX) was employed because of its micrometer-scale spatial resolution and remarkable image contrast for soft matter. We assessed two types of sample support, a paraffin strip and a nylon string, for single fiber samples in terms of easy handling and sample recovery. Fixed individual single fibers were loaded into a narrow polyimide tube in both cases, and the tube ensured that the sample remained in the field of view during the CT measurements. In both cases, the cross-sectional shapes of individual single fibers could be distinguished, with a circular shape for one sample and a triangular shape for the other. However, the support using a nylon string was found to be more suitable for further analysis. The cross-sectional profile of the obtained tomographic image showed a clear difference between polyimide and nylon. The intensity ratio or the image contrast corresponded to that of the local densities. It was also found that the effect of the artifact appeared at around the boundaries of the objects, but the local density could still be utilized for examining individual single fibers.
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Affiliation(s)
- Wataru Tadano
- Forensic Science Laboratory, Hiroshima Prefectural Police H.Q.,Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University
| | - Eishi Tanabe
- West Region Industrial Research Center, Hiroshima Prefectural Technology Research Institute
| | - Jens R Stellhorn
- Department of Applied Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University
| | - Kenji Komaguchi
- Department of Applied Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University
| | - Masaru Takeuchi
- Forensic Science Laboratory, Hiroshima Prefectural Police H.Q
| | - Shinjiro Hayakawa
- Department of Applied Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University
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8
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Terada N, Kouge K, Komaguchi K, Hayakawa S, Tsutsumi H. Thermal Stability Change of Insoluble Sulfur by a Heat Treatment and Its Mechanism Study. ANAL SCI 2020; 36:75-79. [PMID: 31813896 DOI: 10.2116/analsci.19sap05] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Accepted: 11/27/2019] [Indexed: 08/09/2023]
Abstract
Insoluble sulfur (IS), used as a vulcanizing reagent of rubber, is prepared by the thermal ring-opening polymerization of sulfur (S8). Enhancing its thermal stability and content ratio (yield) is important for the industrial production of IS. The post-heating process at a high temperature of 70 or 90°C of the mixture of IS and S8 enhanced the thermal stability of IS and reduced the yield of IS. Further, the process at 30°C enhanced its thermal stability and maintained its yield. Since the thermal stability of IS is considered to be closely related to the chain length of polymer sulfur, a method for determining the chain length of IS was investigated by quantifying the amount of electron spin of radicals from sulfur, estimated from electron spin resonance (ESR) measurements. We confirmed that the long-period post-heating process at 30°C induced high thermal stability without reducing the yield of IS due to growth of the sulfur polymer chains.
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Affiliation(s)
- Naoki Terada
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Ube, Yamaguchi, 755-8611, Japan.
- Sanshin Chemical Industry Co., 4-4-6 Minamihama, Yanai, Yamaguchi, 742-0023, Japan.
| | - Katsushige Kouge
- Sanshin Chemical Industry Co., 4-4-6 Minamihama, Yanai, Yamaguchi, 742-0023, Japan
| | - Kenji Komaguchi
- Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima, 739-8527, Japan
| | - Shinjiro Hayakawa
- Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima, 739-8527, Japan
| | - Hiromori Tsutsumi
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Ube, Yamaguchi, 755-8611, Japan.
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9
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Ide Y, Tominaka S, Yoneno Y, Komaguchi K, Takei T, Nishida H, Tsunoji N, Machida A, Sano T. Condensed ferric dimers for green photocatalytic synthesis of nylon precursors. Chem Sci 2019; 10:6604-6611. [PMID: 31367311 PMCID: PMC6625416 DOI: 10.1039/c9sc01253b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 05/07/2019] [Indexed: 11/29/2022] Open
Abstract
Although iron oxides have been extensively studied as photocatalysts because of their abundance and environmental compatibility, their performance is notoriously low due to factors such as low photoinduced charge-separation efficiency. Iron oxides, thus, must be modified with expensive and/or toxic materials to attain higher performances, which devalues their appeal as sustainable materials. Here, we design an iron oxide exhibiting an unprecedentedly high photocatalytic performance unrealized by previous photocatalysts such as TiO2 for reactions including the selective oxidation of cyclohexane to industrial nylon precursors. The iron oxide photocatalyst consists of ferric dimers, otherwise extremely unstable, formed via etching of Fe and O sites from ferric oxide nanoparticles immobilized within porous silica. We demonstrate a remarkably high photoinduced charge-separation efficiency (long lifetime of active species) of the ferric dimers due to their electronic structure and the potential of this supported photocatalyst for many more reactions.
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Affiliation(s)
- Yusuke Ide
- International Center for Materials Nanoarchitectonics (MANA) , National Institute for Materials Science , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan . ;
| | - Satoshi Tominaka
- International Center for Materials Nanoarchitectonics (MANA) , National Institute for Materials Science , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan . ;
| | - Yumi Yoneno
- Department of Earth Sciences , Waseda University , 1-6-1 Nishiwaseda, Shinjuku-ku , Tokyo 165-8050 , Japan
| | - Kenji Komaguchi
- Graduate School of Engineering , Department of Applied Chemistry , Hiroshima University , 1-4-1 Kagamiyama , Higashi-Hiroshima 739-8527 , Japan
| | - Toshiaki Takei
- International Center for Materials Nanoarchitectonics (MANA) , National Institute for Materials Science , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan . ;
| | - Hidechika Nishida
- Graduate School of Engineering , Department of Applied Chemistry , Hiroshima University , 1-4-1 Kagamiyama , Higashi-Hiroshima 739-8527 , Japan
| | - Nao Tsunoji
- Graduate School of Engineering , Department of Applied Chemistry , Hiroshima University , 1-4-1 Kagamiyama , Higashi-Hiroshima 739-8527 , Japan
| | - Akihiko Machida
- Synchrotron Radiation Research Center , National Institutes for Quantum and Radiological Science and Technology , 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148 , Japan
| | - Tsuneji Sano
- Graduate School of Engineering , Department of Applied Chemistry , Hiroshima University , 1-4-1 Kagamiyama , Higashi-Hiroshima 739-8527 , Japan
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10
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Tsunoji N, Nishida H, Ide Y, Komaguchi K, Hayakawa S, Yagenji Y, Sadakane M, Sano T. Photocatalytic Activation of C–H Bonds by Spatially Controlled Chlorine and Titanium on the Silicate Layer. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01284] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [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)
- Nao Tsunoji
- Graduate School of Engineering, Department of Applied Chemistry, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Hidechika Nishida
- Graduate School of Engineering, Department of Applied Chemistry, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Yusuke Ide
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Kenji Komaguchi
- Graduate School of Engineering, Department of Applied Chemistry, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Shinjiro Hayakawa
- Graduate School of Engineering, Department of Applied Chemistry, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Yuya Yagenji
- Graduate School of Engineering, Department of Applied Chemistry, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Masahiro Sadakane
- Graduate School of Engineering, Department of Applied Chemistry, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Tsuneji Sano
- Graduate School of Engineering, Department of Applied Chemistry, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
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11
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Nakaya T, Tsuchiya Y, Horiguchi B, Sugikawa K, Komaguchi K, Ikeda A. 1H NMR Determination of Incorporated Porphyrin Location in Lipid Membranes of Liposomes. BCSJ 2018. [DOI: 10.1246/bcsj.20180115] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [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)
- Toshimi Nakaya
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8527, Japan
| | - Yuki Tsuchiya
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8527, Japan
| | - Banri Horiguchi
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8527, Japan
| | - Kouta Sugikawa
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8527, Japan
| | - Kenji Komaguchi
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8527, Japan
| | - Atsushi Ikeda
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8527, Japan
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12
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Yamazaki S, Shimizu D, Tani S, Honda K, Sumimoto M, Komaguchi K. Effect of Dispersants on Photochromic Behavior of Tungsten Oxide Nanoparticles in Methylcellulose. ACS Appl Mater Interfaces 2018; 10:19889-19896. [PMID: 29767503 DOI: 10.1021/acsami.8b04875] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Tungsten oxide-based photochromic films that change reversibly in air between colorless-transparent in the dark and dark blue under UV irradiation were prepared by using methylcellulose as a film matrix and various dispersants. Alpha-hydroxyl acid such as glycolic acid (GA) or glyceric acid (GlyA) is the best dispersant because it can make the film transparent by adding a small quantity much less than that of 3-hydroxypropionic acid or ethylene glycol. Fourier-transform infrared spectra and Raman spectra indicate that a strong interaction exists between WO3 and GA or GlyA. The coloration and bleaching processes of the prepared films were investigated to clarify the effect of the dispersants and the moisture contents. The bleaching rate remarkably decreased in the films containing GA or GlyA but accelerated by increasing the contact with O2. Measurements of electron-spin resonance reveals that GA and GlyA as dispersants stabilize the W5+ state. This paper shows that the coloring rate and the period for keeping the blue-colored state are tunable by changing the dispersants. The photochromic films containing α-hydroxyl acid as the dispersant have the potential for application as rewritable film on which information displayed with blue-colored state can be clearly readable for longer times compared with other dispersants.
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Affiliation(s)
- Suzuko Yamazaki
- Division of Earth Science, Biology, and Chemistry, Graduate School of Sciences and Technology for Innovation , Yamaguchi University , Yoshida, Yamaguchi 753-8512 , Japan
| | - Dai Shimizu
- Division of Earth Science, Biology, and Chemistry, Graduate School of Sciences and Technology for Innovation , Yamaguchi University , Yoshida, Yamaguchi 753-8512 , Japan
| | - Seiji Tani
- Division of Earth Science, Biology, and Chemistry, Graduate School of Sciences and Technology for Innovation , Yamaguchi University , Yoshida, Yamaguchi 753-8512 , Japan
| | - Kensuke Honda
- Division of Earth Science, Biology, and Chemistry, Graduate School of Sciences and Technology for Innovation , Yamaguchi University , Yoshida, Yamaguchi 753-8512 , Japan
| | - Michinori Sumimoto
- Division of Applied Chemistry, Graduate School of Sciences and Technology for Innovation , Yamaguchi University , Tokiwadai, Ube 755-8611 , Japan
| | - Kenji Komaguchi
- Department of Applied Chemistry, Graduate School of Engineering , Hiroshima University , 1-4-1 Kagamiyama , Higashi-Hiroshima , Hiroshima 739-8527 , Japan
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13
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Liao YT, Huang YY, Chen HM, Komaguchi K, Hou CH, Henzie J, Yamauchi Y, Ide Y, Wu KCW. Mesoporous TiO 2 Embedded with a Uniform Distribution of CuO Exhibit Enhanced Charge Separation and Photocatalytic Efficiency. ACS Appl Mater Interfaces 2017; 9:42425-42429. [PMID: 29182314 DOI: 10.1021/acsami.7b13912] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Mixed metal oxide nanoparticles have interesting physical and chemical properties, but synthesizing them with colloidal methods is still challenging and often results in very heterogeneous structures. Here, we describe a simple method to synthesize mesoporous titania nanoparticles implanted with a uniform distribution of copper oxide nanocrystals (CuO@MTs). By calcining a titanium-based metal-organic framework (MIL-125) in the presence of Cu ions, we can trap the Cu in the TiO2 matrix. Removal of the organic ligand creates mesoporosity and limits phase separation so that tiny CuO nanocrystals form in the interstices of the TiO2. The CuO@MTs exhibits superior performance for photocatalytic hydrogen evolution (4760 μmol h-1) that is >90 times larger than pristine titania.
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Affiliation(s)
- Yu-Te Liao
- Department of Chemical Engineering, National Taiwan University . No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Yu-Yuan Huang
- Department of Chemical Engineering, National Taiwan University . No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Hao Ming Chen
- Department of Chemistry, National Taiwan University , Taipei 106, Taiwan
| | - Kenji Komaguchi
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University , Hiroshima 739-0046, Japan
| | - Chia-Hung Hou
- Graduate Institute of Environmental Engineering, National Taiwan University , Taipei 106, Taiwan
| | - Joel Henzie
- International Center for Materials Nanoarchitectonics, National Institute for Materials Science (NIMS) , Japan 1-2-1 Sengen, Tsukuba-city, Ibaraki 305-0047, Japan
| | - Yusuke Yamauchi
- International Center for Materials Nanoarchitectonics, National Institute for Materials Science (NIMS) , Japan 1-2-1 Sengen, Tsukuba-city, Ibaraki 305-0047, Japan
- Australian Institute for Innovative Materials (AIIM) & School of Chemistry, University of Wollongong , Squires Way, North Wollongong, New South Wales 2500, Australia
| | - Yusuke Ide
- International Center for Materials Nanoarchitectonics, National Institute for Materials Science (NIMS) , Japan 1-2-1 Sengen, Tsukuba-city, Ibaraki 305-0047, Japan
| | - Kevin C-W Wu
- Department of Chemical Engineering, National Taiwan University . No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
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14
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Ikeda A, Mae T, Sugikawa K, Komaguchi K, Konishi T, Hirao T, Haino T. Slow Intermolecular Complexation-Decomplexation Exchanges of Cyclodextrins in Fullerene and Its Derivative Complexes. ChemistrySelect 2017. [DOI: 10.1002/slct.201702319] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Atsushi Ikeda
- Department of Applied Chemistry, Graduate School of Engineering; Hiroshima University; 1-4-1 Kagamiyama Higashi-Hiroshima 739-8527 Japan
| | - Tomoya Mae
- Department of Applied Chemistry, Graduate School of Engineering; Hiroshima University; 1-4-1 Kagamiyama Higashi-Hiroshima 739-8527 Japan
| | - Kouta Sugikawa
- Department of Applied Chemistry, Graduate School of Engineering; Hiroshima University; 1-4-1 Kagamiyama Higashi-Hiroshima 739-8527 Japan
| | - Kenji Komaguchi
- Department of Applied Chemistry, Graduate School of Engineering; Hiroshima University; 1-4-1 Kagamiyama Higashi-Hiroshima 739-8527 Japan
| | - Toshifumi Konishi
- Department of Chemistry, College of Engineering; Shibaura Institute of Technology; 307 Fukasaku, Minuma-ku Saitama 337-8570 Japan
| | - Takehiro Hirao
- Department of Chemistry, Graduate School of Science; Hiroshima University; 1-3-1 Kagamiyama Higashi-Hiroshima 739-8526 Japan
| | - Takeharu Haino
- Department of Chemistry, Graduate School of Science; Hiroshima University; 1-3-1 Kagamiyama Higashi-Hiroshima 739-8526 Japan
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15
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Ohshita J, Tsuchida T, Komaguchi K, Yamamoto K, Adachi Y, Ooyama Y, Harima Y, Tanaka K. Studies on Spherically Distributed LUMO and Electron-Accepting Properties of Caged Hexakis(germasesquioxanes). Organometallics 2017. [DOI: 10.1021/acs.organomet.6b00950] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [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)
- Joji Ohshita
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
| | - Toshiyuki Tsuchida
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
| | - Kenji Komaguchi
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
| | - Kazuki Yamamoto
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
| | - Yohei Adachi
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
| | - Yousuke Ooyama
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
| | - Yutaka Harima
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
| | - Kazuyoshi Tanaka
- Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4 Nishihiraki-cho, Takano, Sakyo-ku, Kyoto 606-8103, Japan
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16
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Ide Y, Inami N, Hattori H, Saito K, Sohmiya M, Tsunoji N, Komaguchi K, Sano T, Bando Y, Golberg D, Sugahara Y. Remarkable Charge Separation and Photocatalytic Efficiency Enhancement through Interconnection of TiO2
Nanoparticles by Hydrothermal Treatment. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201510000] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yusuke Ide
- International Center for Materials Nanoarchitectonics (MANA); National Institute for Materials Science (NIMS); 1-1 Namiki, Tsukuba Ibaraki 305-0044 Japan
- Graduate School of Creative Science and Engineering; Waseda University; 1-6-1 Nishiwaseda, Shinjuku-ku Tokyo 169-8050 Japan
| | - Nozomu Inami
- Department of Earth Sciences; Waseda University; 1-6-1 Nishiwaseda, Shinjuku-ku Tokyo 169-8050 Japan
| | - Hideya Hattori
- Graduate School of Engineering; Department of Applied Chemistry; Hiroshima University; 1-4-1 Kagamiyama Higashi-Hiroshima 739-8527 Japan
| | - Kanji Saito
- Department of Earth Sciences; Waseda University; 1-6-1 Nishiwaseda, Shinjuku-ku Tokyo 169-8050 Japan
| | - Minoru Sohmiya
- Department of Earth Sciences; Waseda University; 1-6-1 Nishiwaseda, Shinjuku-ku Tokyo 169-8050 Japan
| | - Nao Tsunoji
- Graduate School of Engineering; Department of Applied Chemistry; Hiroshima University; 1-4-1 Kagamiyama Higashi-Hiroshima 739-8527 Japan
| | - Kenji Komaguchi
- Graduate School of Engineering; Department of Applied Chemistry; Hiroshima University; 1-4-1 Kagamiyama Higashi-Hiroshima 739-8527 Japan
| | - Tsuneji Sano
- Graduate School of Engineering; Department of Applied Chemistry; Hiroshima University; 1-4-1 Kagamiyama Higashi-Hiroshima 739-8527 Japan
| | - Yoshio Bando
- International Center for Materials Nanoarchitectonics (MANA); National Institute for Materials Science (NIMS); 1-1 Namiki, Tsukuba Ibaraki 305-0044 Japan
| | - Dmitri Golberg
- International Center for Materials Nanoarchitectonics (MANA); National Institute for Materials Science (NIMS); 1-1 Namiki, Tsukuba Ibaraki 305-0044 Japan
| | - Yoshiyuki Sugahara
- Graduate School of Creative Science and Engineering; Waseda University; 1-6-1 Nishiwaseda, Shinjuku-ku Tokyo 169-8050 Japan
- Department of Applied Chemistry; School of Advanced Science and Engineering; Waseda University; 3-4-1 Ohkubo, Shinjuku-ku Tokyo 169-8555 Japan
- Kagami Memorial Research Institute for Materials Science and Technology; Waseda University; 2-8-26 Nishiwaseda, Shinjuku-ku Tokyo 169-0051 Japan
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17
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Ide Y, Inami N, Hattori H, Saito K, Sohmiya M, Tsunoji N, Komaguchi K, Sano T, Bando Y, Golberg D, Sugahara Y. Remarkable Charge Separation and Photocatalytic Efficiency Enhancement through Interconnection of TiO2 Nanoparticles by Hydrothermal Treatment. Angew Chem Int Ed Engl 2016; 55:3600-5. [PMID: 26891152 DOI: 10.1002/anie.201510000] [Citation(s) in RCA: 105] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Revised: 01/28/2016] [Indexed: 11/08/2022]
Abstract
Although tremendous effort has been directed to synthesizing advanced TiO2 , it remains difficult to obtain TiO2 exhibiting a photocatalytic efficiency higher than that of P25, a benchmark photocatalyst. P25 is composed of anatase, rutile, and amorphous TiO2 particles, and photoexcited electron transfer and subsequent charge separation at the anatase-rutile particle interfaces explain its high photocatalytic efficiency. Herein, we report on a facile and rational hydrothermal treatment of P25 to selectively convert the amorphous component into crystalline TiO2 , which is deposited between the original anatase and rutile particles to increase the particle interfaces and thus enhance charge separation. This process produces a new TiO2 exhibiting a considerably enhanced photocatalytic efficiency. This method of synthesizing this TiO2 , inspired by a recently burgeoning zeolite design, promises to make TiO2 applications more feasible and effective.
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Affiliation(s)
- Yusuke Ide
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan. .,Graduate School of Creative Science and Engineering, Waseda University, 1-6-1 Nishiwaseda, Shinjuku-ku, Tokyo, 169-8050, Japan.
| | - Nozomu Inami
- Department of Earth Sciences, Waseda University, 1-6-1 Nishiwaseda, Shinjuku-ku, Tokyo, 169-8050, Japan
| | - Hideya Hattori
- Graduate School of Engineering, Department of Applied Chemistry, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, 739-8527, Japan
| | - Kanji Saito
- Department of Earth Sciences, Waseda University, 1-6-1 Nishiwaseda, Shinjuku-ku, Tokyo, 169-8050, Japan
| | - Minoru Sohmiya
- Department of Earth Sciences, Waseda University, 1-6-1 Nishiwaseda, Shinjuku-ku, Tokyo, 169-8050, Japan
| | - Nao Tsunoji
- Graduate School of Engineering, Department of Applied Chemistry, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, 739-8527, Japan
| | - Kenji Komaguchi
- Graduate School of Engineering, Department of Applied Chemistry, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, 739-8527, Japan
| | - Tsuneji Sano
- Graduate School of Engineering, Department of Applied Chemistry, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, 739-8527, Japan
| | - Yoshio Bando
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
| | - Dmitri Golberg
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
| | - Yoshiyuki Sugahara
- Graduate School of Creative Science and Engineering, Waseda University, 1-6-1 Nishiwaseda, Shinjuku-ku, Tokyo, 169-8050, Japan. .,Department of Applied Chemistry, School of Advanced Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo, 169-8555, Japan. .,Kagami Memorial Research Institute for Materials Science and Technology, Waseda University, 2-8-26 Nishiwaseda, Shinjuku-ku, Tokyo, 169-0051, Japan.
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18
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Ide Y, Nagao K, Saito K, Komaguchi K, Fuji R, Kogure A, Sugahara Y, Bando Y, Golberg D. h-BN nanosheets as simple and effective additives to largely enhance the activity of Au/TiO2 plasmonic photocatalysts. Phys Chem Chem Phys 2016; 18:79-83. [DOI: 10.1039/c5cp05958e] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [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
Au/TiO2 plasmonic photocatalysts showed largely enhanced activity for the oxidation of formic acid in water into CO2 when simply mixed with h-BN nanosheets, as a result of electron transfer from photoexcited Au/TiO2 to the additive to retard charge recombination.
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Affiliation(s)
- Y. Ide
- International Center for Materials Nanoarchitectonics (WPI-MANA)
- National Institute for Materials Science (NIMS)
- Tsukuba
- Japan
- Graduate School of Creative Science and Engineering
| | - K. Nagao
- Graduate School of Creative Science and Engineering
- Waseda University
- Tokyo 169-8050
- Japan
| | - K. Saito
- Graduate School of Creative Science and Engineering
- Waseda University
- Tokyo 169-8050
- Japan
| | - K. Komaguchi
- Graduate School of Engineering
- Department of Applied Chemistry
- Hiroshima University
- Higashi-Hiroshima 739-8527
- Japan
| | - R. Fuji
- Shimadzu Cooperation
- Hadano-shi
- Japan
| | - A. Kogure
- Shimadzu Techno-Research
- INC
- Hadano-shi
- Japan
| | - Y. Sugahara
- Graduate School of Creative Science and Engineering
- Waseda University
- Tokyo 169-8050
- Japan
- Department of Applied Chemistry
| | - Y. Bando
- International Center for Materials Nanoarchitectonics (WPI-MANA)
- National Institute for Materials Science (NIMS)
- Tsukuba
- Japan
| | - D. Golberg
- International Center for Materials Nanoarchitectonics (WPI-MANA)
- National Institute for Materials Science (NIMS)
- Tsukuba
- Japan
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19
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Saito K, Kozeni M, Sohmiya M, Komaguchi K, Ogawa M, Sugahara Y, Ide Y. Unprecedentedly enhanced solar photocatalytic activity of a layered titanate simply integrated with TiO2 nanoparticles. Phys Chem Chem Phys 2016; 18:30920-30925. [DOI: 10.1039/c6cp05635k] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [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 report a simple, low-cost methodology for unprecedentedly enhancing the photocatalytic activity of layered inorganic semiconductors.
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Affiliation(s)
- Kanji Saito
- Graduate School of Creative Science and Engineering
- Waseda University
- Tokyo 169-8050
- Japan
- Department of Earth Sciences
| | - Misa Kozeni
- Department of Earth Sciences
- Waseda University
- Tokyo 169-8050
- Japan
| | - Minoru Sohmiya
- Department of Earth Sciences
- Waseda University
- Tokyo 169-8050
- Japan
| | - Kenji Komaguchi
- Department of Applied Chemistry
- Graduate School of Engineering
- Hiroshima University
- Higashi-Hiroshima 739-8527
- Japan
| | - Makoto Ogawa
- Graduate School of Creative Science and Engineering
- Waseda University
- Tokyo 169-8050
- Japan
- Department of Earth Sciences
| | - Yoshiyuki Sugahara
- Graduate School of Creative Science and Engineering
- Waseda University
- Tokyo 169-8050
- Japan
- Department of Applied Chemistry
| | - Yusuke Ide
- Graduate School of Creative Science and Engineering
- Waseda University
- Tokyo 169-8050
- Japan
- International Center for Materials Nanoarchitectonics (MANA)
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20
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Imae I, Ogino R, Tsuboi Y, Goto T, Komaguchi K, Harima Y. Synthesis of EDOT-containing polythiophenes and their properties in relation to the composition ratio of EDOT. RSC Adv 2015. [DOI: 10.1039/c5ra17235g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [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] Open
Abstract
Polythiophenes composed of 3,4-ethylenedioxythiophene and 3-hexylthiophene with different composition ratios are synthesized and their optical, electrochemical and electrical properties are investigated in terms of the composition ratio.
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Affiliation(s)
- Ichiro Imae
- Department of Applied Chemistry
- Graduate School of Engineering
- Hiroshima University
- Hiroshima 739-8527
- Japan
| | - Ryo Ogino
- Department of Applied Chemistry
- Graduate School of Engineering
- Hiroshima University
- Hiroshima 739-8527
- Japan
| | - Yoshiaki Tsuboi
- Department of Applied Chemistry
- Graduate School of Engineering
- Hiroshima University
- Hiroshima 739-8527
- Japan
| | - Tatsunari Goto
- Department of Applied Chemistry
- Graduate School of Engineering
- Hiroshima University
- Hiroshima 739-8527
- Japan
| | - Kenji Komaguchi
- Department of Applied Chemistry
- Graduate School of Engineering
- Hiroshima University
- Hiroshima 739-8527
- Japan
| | - Yutaka Harima
- Department of Applied Chemistry
- Graduate School of Engineering
- Hiroshima University
- Hiroshima 739-8527
- Japan
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21
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Imae I, Sagawa H, Mashima T, Komaguchi K, Ooyama Y, Harima Y. Synthesis of Soluble Polythiophene Partially Containing 3,4-Ethylenedioxythiophene and 3-Hexylthiophene by Polycondensation. ACTA ACUST UNITED AC 2014. [DOI: 10.4236/ojpchem.2014.43010] [Citation(s) in RCA: 16] [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: 11/20/2022]
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22
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Imae I, Imabayashi S, Komaguchi K, Tan Z, Ooyama Y, Harima Y. Synthesis and electrical properties of novel oligothiophenes partially containing 3,4-ethylenedioxythiophenes. RSC Adv 2014. [DOI: 10.1039/c3ra44129f] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
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23
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Tan Z, Imae I, Ooyama Y, Komaguchi K, Ohshita J, Harima Y. Low bandgap polymers with benzodithiophene and bisthienylacrylonitrile units for photovoltaic applications. Eur Polym J 2013. [DOI: 10.1016/j.eurpolymj.2013.02.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Ooyama Y, Yamaguchi N, Imae I, Komaguchi K, Ohshita J, Harima Y. Dye-sensitized solar cells based on D–π–A fluorescent dyes with two pyridyl groups as an electron-withdrawing–injecting anchoring group. Chem Commun (Camb) 2013; 49:2548-50. [DOI: 10.1039/c3cc40498f] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.7] [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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25
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Ogo S, Moroi S, Ueda T, Komaguchi K, Hayakawa S, Ide Y, Sano T, Sadakane M. Preparation of tetrabutylammonium salt of a mono-Ru(iii)-substituted α-Keggin-type silicotungstate with a 4,4′-bipyridine ligand and its electrochemical behaviour in organic solvents. Dalton Trans 2013; 42:7190-5. [DOI: 10.1039/c3dt50300c] [Citation(s) in RCA: 11] [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: 11/21/2022]
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26
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Imae I, Nakamura Y, Komaguchi K, Ooyama Y, Ohshita J, Harima Y. Development of a simple method for fabrication of transparent conductive films with high mechanical strength. Sci Technol Adv Mater 2012; 13:045005. [PMID: 27877505 PMCID: PMC5090561 DOI: 10.1088/1468-6996/13/4/045005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Accepted: 07/10/2012] [Indexed: 06/06/2023]
Abstract
We have developed a simple method of fabricating transparent conductive films with a high mechanical strength on glass and indium tin oxide substrates. It does not require a large excess of organic solvents and polymerization catalysts and can yield smooth films by spin-coating of a mixture of a commercially available aqueous dispersion of poly(3,4-ethylenedioxythiophene)-poly(4-styrene sulfonate) and a neat liquid of tetraethyl orthosilicate. Preparation conditions such as feed ratio, kinds of additives, and annealing temperature and time were optimized to give highly conductive, transparent and mechanically strong films.
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27
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Kano Y, Kushimoto K, Komaguchi K, Ooyama Y, Imae I, Ohshita J, Harima Y. Intermolecular distances of carboxylated TEMPO derivatives on TiO2 evaluated by spin-probe ESR. Phys Chem Chem Phys 2012; 14:15988-90. [DOI: 10.1039/c2cp43015k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [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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28
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Ooyama Y, Yamaguchi N, Inoue S, Nagano T, Miyazaki E, Fukuoka H, Imae I, Komaguchi K, Ohshita J, Harima Y. Mechanofluorochromism of carbazole-type D–π–A fluorescent dyes. Tetrahedron 2012. [DOI: 10.1016/j.tet.2011.11.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [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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Ooyama Y, Nagano T, Inoue S, Imae I, Komaguchi K, Ohshita J, Harima Y. Dye-Sensitized Solar Cells Based on Donor-π-Acceptor Fluorescent Dyes with a Pyridine Ring as an Electron-Withdrawing-Injecting Anchoring Group. Chemistry 2011; 17:14837-43. [DOI: 10.1002/chem.201101923] [Citation(s) in RCA: 120] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2011] [Revised: 08/04/2011] [Indexed: 11/07/2022]
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Ooyama Y, Inoue S, Nagano T, Kushimoto K, Ohshita J, Imae I, Komaguchi K, Harima Y. Dye-Sensitized Solar Cells Based On Donor-Acceptor π-Conjugated Fluorescent Dyes with a Pyridine Ring as an Electron-Withdrawing Anchoring Group. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201102552] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [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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Ooyama Y, Inoue S, Nagano T, Kushimoto K, Ohshita J, Imae I, Komaguchi K, Harima Y. Dye-Sensitized Solar Cells Based On Donor-Acceptor π-Conjugated Fluorescent Dyes with a Pyridine Ring as an Electron-Withdrawing Anchoring Group. Angew Chem Int Ed Engl 2011; 50:7429-33. [DOI: 10.1002/anie.201102552] [Citation(s) in RCA: 218] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2011] [Revised: 05/30/2011] [Indexed: 11/09/2022]
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Harima Y, Setodoi S, Imae I, Komaguchi K, Ooyama Y, Ohshita J, Mizota H, Yano J. Electrochemical reduction of graphene oxide in organic solvents. Electrochim Acta 2011. [DOI: 10.1016/j.electacta.2011.03.117] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [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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Ooyama Y, Shimada Y, Inoue S, Nagano T, Fujikawa Y, Komaguchi K, Imae I, Harima Y. New molecular design of donor-π-acceptor dyes for dye-sensitized solar cells: control of molecular orientation and arrangement on TiO2surface. NEW J CHEM 2011. [DOI: 10.1039/c0nj00585a] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [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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Ooyama Y, Sumomogi M, Nagano T, Kushimoto K, Komaguchi K, Imae I, Harima Y. Detection of water in organic solvents by photo-induced electron transfer method. Org Biomol Chem 2011; 9:1314-6. [DOI: 10.1039/c0ob00933d] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [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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Ooyama Y, Matsugasako A, Oka K, Nagano T, Sumomogi M, Komaguchi K, Imae I, Harima Y. Fluorescence PET (photo-induced electron transfer) sensors for water based on anthracene–boronic acid ester. Chem Commun (Camb) 2011; 47:4448-50. [DOI: 10.1039/c1cc10470e] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.0] [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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Imae I, Tokita D, Ooyama Y, Komaguchi K, Ohshita J, Harima Y. Charge transport properties of polymer films comprising oligothiophene in silsesquioxane network. Polym Chem 2011. [DOI: 10.1039/c0py00387e] [Citation(s) in RCA: 13] [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: 11/21/2022]
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Ooyama Y, Nagano T, Inoue S, Imae I, Komaguchi K, Harima Y. Dye-Sensitized Solar Cells Based on D–π–A Fluorescent Dyes with Pyridine Ring Forming Strong Interaction with Nanocrystalline TiO2. BCSJ 2010. [DOI: 10.1246/bcsj.20100098] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [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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Ooyama Y, Ito G, Fukuoka H, Nagano T, Kagawa Y, Imae I, Komaguchi K, Harima Y. Mechanofluorochromism of heteropolycyclic donor–π-acceptor type fluorescent dyes. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.07.018] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Harima Y, Komaguchi K, Oka K, Maruoka T, Imae I, Ooyama Y. Trapping of atomic hydrogens in cage-shaped silsesquioxanes by electric discharge. Chem Commun (Camb) 2010; 46:2076-8. [PMID: 20221497 DOI: 10.1039/b917165g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [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 simple and safe technique which is based on glow discharge is demonstrated for stable encapsulation of H atoms in cage-shaped silsesquioxanes at room temperature, leading to the encapsulation yield of ca. 10(-4) H atoms per molecule for 10-minute discharging, much faster than the conventional gamma-ray irradiation technique.
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Affiliation(s)
- Yutaka Harima
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan.
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Harima Y, Ishiguro Y, Fujikawa Y, Hashiguchi T, Komaguchi K, Ooyama Y, Imae I, Ohshita J. Absorption spectra of field-generated cation radical in triphenyldiamine film: Lack of intervalence-charge transfer band. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2009.12.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Ooyama Y, Ito G, Kushimoto K, Komaguchi K, Imae I, Harima Y. Synthesis and fluorescence and electrochemical properties of D–π-A structural isomers of benzofuro[2,3-c]oxazolo[4,5-a]carbazole-type and benzofuro[2,3-c]oxazolo[5,4-a]carbazole-type fluorescent dyes. Org Biomol Chem 2010; 8:2756-70. [DOI: 10.1039/c003526b] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Imae I, Takayama S, Tokita D, Ooyama Y, Komaguchi K, Ohshita J, Sugioka T, Kanehira K, Harima Y. Development of anchored oligothiophenes on substrates for the application to the tunable transparent conductive films. POLYMER 2009. [DOI: 10.1016/j.polymer.2009.10.058] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Ooyama Y, Inoue S, Asada R, Ito G, Kushimoto K, Komaguchi K, Imae I, Harima Y. Dye-Sensitized Solar Cells Based on a Novel Fluorescent Dye with a Pyridine Ring and a Pyridinium Dye with the Pyridinium Ring Forming Strong Interactions with Nanocrystalline TiO2 Films. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900983] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Ooyama Y, Shimada Y, Ishii A, Ito G, Kagawa Y, Imae I, Komaguchi K, Harima Y. Photovoltaic performance of dye-sensitized solar cells based on a series of new-type donor–acceptor π-conjugated sensitizer, benzofuro[2,3-c]oxazolo[4,5-a]carbazole fluorescent dyes. J Photochem Photobiol A Chem 2009. [DOI: 10.1016/j.jphotochem.2009.01.017] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Ooyama Y, Asada R, Inoue S, Komaguchi K, Imae I, Harima Y. Solvatochromism of novel donor–π–acceptor type pyridinium dyes in halogenated and non-halogenated solvents. NEW J CHEM 2009. [DOI: 10.1039/b9nj00332k] [Citation(s) in RCA: 27] [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: 11/21/2022]
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Imae I, Takenaka Y, Tokita D, Ooyama Y, Komaguchi K, Harima Y. Drastic Enhancement of Cycle Lifetime of Electrochromic Devices Using Polysilsesquioxane as an Anchoring Agent. CHEM LETT 2008. [DOI: 10.1246/cl.2008.964] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Harima Y, Jiang X, Patil R, Komaguchi K, Mizota H. Influence of film structure on mobilities of charge carriers in conducting polymers. Electrochim Acta 2007. [DOI: 10.1016/j.electacta.2007.07.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [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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Komaguchi K, Matsubara Y, Shiotani M, Gustafsson H, Lund E, Lund A. An ESR and ENDOR study of irradiated 6Li-formate. Spectrochim Acta A Mol Biomol Spectrosc 2007; 66:754-60. [PMID: 16875868 DOI: 10.1016/j.saa.2006.04.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2005] [Accepted: 04/26/2006] [Indexed: 05/11/2023]
Abstract
Lithium formate ((6)LiOOCH.H(2)O), 95% (6)Li enrichment, combined with an exchange of crystallization water with D(2)O was investigated. The ESR spectrum of the radiation induced free radicals stable at room temperature consists of a singlet with a narrow line width, 0.92mT. (6)Li has smaller magnetic moment and nuclear spin, which resulted in the narrower line width accompanied with an increase in peak amplitude. In comparison with lithium formate with natural isotopic composition, (6)Li (7.5%, I=1) and (7)Li (92.5%, I=3/2), the sensitivity was increased by a factor of two. With optimised spectrometer settings (6)Li formate had seven times higher sensitivity compared to alanine. Therefore this material is proposed as a dosimeter material in a dose range down to 0.1Gy. The g and the (13)C-hyperfine (hf) tensors of the CO(2)(-) radical anion, major paramagnetic products, were evaluated to be g=(2.0037, 1.9975, 2.0017), and A((13)C)=(465.5, 447.5, 581.3) MHz for polycrystalline samples at room temperature. Furthermore, the (1)H-hf and (6)Li-hf tensors observed for the surroundings of CO(2)(-) by ENDOR technique were in fairly good agreement with DFT calculations. The CO(2)(-) radicals are found to be so stable that the formate is applicable to the ESR dosimetry, because of fully relaxing in a fully relaxed geometrical structure of the CO(2)(-) component and remaining tight binding with the surroundings after the H atom detachment from HCO(2)(-).
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Affiliation(s)
- K Komaguchi
- Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan.
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Komaguchi K, Nomura K, Shiotani M. High-resolution ESR study of the H...CH3, H...CHD2, D...CH2D, and D...CD3 radical pairs in solid argon. J Phys Chem A 2007; 111:726-33. [PMID: 17249765 DOI: 10.1021/jp063723z] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
High-resolution electron spin resonance (ESR) spectra of radical pairs of a hydrogen atom that coupled with a methyl radical (H...CH3, H...CHD2, D...CH2D, and D...CD3) were observed for X-ray irradiated solid argon containing selectively deuterium-labeled methanes, CH4, CH2D2, and CD4, at 4.2 K. The double-quartet 1H-hyperfine (hf) splittings of ca. 26 and 1.16 mT at the Deltam(s) = +/-1 and Deltam(s) = +/-2 transitions, which are one-half of the isotropic 1H-hf splittings of an isolated H-atom and a CH3 radical, were attributed to the H...CH3 pair. The 1H-hf splittings at the Deltam(s) = +/-1 transition were further split by the fine structure (fs) due to the electron dipole-dipole coupling. Because of the high-resolution spectra, three different sets of the fs splitting, d, are clearly resolved in the spectra of both the H...CH3 and the D...CD3 pairs. The separation distance (inter-spin distance), R, between the H-atom and the CH3 radical being in pairs was evaluated from the d values based on a point-dipole interaction model. For the case of the H...CH3 pair, the observed d values of 4.2, 4.9, and 5.1 mT yield the respective separations, R = 0.87, 0.83, and 0.82 nm, to probe the trapping site of the pair in an Ar crystalline lattice (fcc). For the pair with R = 0.87 nm, for example, we propose that the CH3 radical occupies a substitutional site and the counter H-atom occupies either the interstitial tetrahedral sites directed away from the CH3 radicals by a distance of 0.87 nm or the interstitial octahedral sites by a distance of 0.88 nm. When a mixture of CH4 and CD4 in a solid Ar matrix was irradiated, only two different radical pairs, H...CH3 and D...CD3, were observed. This result clearly demonstrates that the hydrogen atom and methyl radicals, which undergo a pairwise trapping, can originate from the same methane molecule.
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Affiliation(s)
- Kenji Komaguchi
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan.
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Yamanaka S, Kubo A, Inumaru K, Komaguchi K, Kini NS, Inoue T, Irifune T. Electron conductive three-dimensional polymer of cuboidal C60. Phys Rev Lett 2006; 96:076602. [PMID: 16606117 DOI: 10.1103/physrevlett.96.076602] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2005] [Indexed: 05/08/2023]
Abstract
Single crystals of three-dimensional (3D) C60 polymer were prepared by the topotactic conversion of two-dimensional (2D) C60 polymer single crystals at a pressure of 15 GPa at 600 degrees C. The x-ray single crystal study revealed that the 3D C60 polymer crystallized in a body centered orthorhombic space group Immm, and spherical C60 monomer units were substantially deformed to rectangular parallelepiped (cuboidal) shapes, each unit being bonded to eight cuboidal C60 neighbors via [3 + 3] cycloaddition. The 3D C60 polymer was electron conductive, in contrast with the nonconductive behavior of 2D polymers.
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Affiliation(s)
- Shoji Yamanaka
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
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