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Zhang L, Yan W, Kohtani S, Fukuyoshi S, Hu M, Nagao S, Tang N. Promotive effects of marine-derived dimethyl sulfoxide on the photodegradation of phenanthrene in the atmosphere. Sci Total Environ 2024; 926:171938. [PMID: 38527541 DOI: 10.1016/j.scitotenv.2024.171938] [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] [Subscribe] [Scholar Register] [Received: 12/03/2023] [Revised: 02/26/2024] [Accepted: 03/22/2024] [Indexed: 03/27/2024]
Abstract
Dimethyl sulfoxide (DMSO), a versatile medium, is a particular component in the marine atmosphere that possibly causes polycyclic aromatic hydrocarbons (PAHs) to degrade differently than they do in the continental atmosphere. In this study, phenanthrene (Phe) was used as a model PAH in batch photochemical experiments to investigate the chemical actions of DMSO and the underlying mechanisms. The photodegradation of Phe in aqueous solutions with DMSO volume fractions from 0 % to 100 % was initiated by ultraviolet (UV) radiation and promoted by singlet oxygen, which was consistent with pseudo-first-order kinetics. Phe photodegraded faster in a mixture of DMSO and water than in water or DMSO alone, and the rate constant showed a unimodal distribution over the DMSO fraction range, peaking at 33 % DMSO (0.0333 ± 0.0009 min-1) and 40 % DMSO (0.0199 ± 0.0005 min-1) under 254 nm and 302 nm UV radiation, respectively. This interesting phenomenon was attributed to the competition of DMSO for UV radiation and singlet oxygen and changes in dissolved oxygen and free water contents caused by the interaction between DMSO and water molecules. In addition, 9,10-phenanthrenequinone (9,10-PhQ) with high cytotoxicity was the main photodegradation product of Phe under various conditions. The photodegradation rate of Phe in the mixtures of DMSO and water was comparable to its reaction rate with OH radicals, suggesting that 9,10-PhQ can be rapidly generated in the marine atmosphere, driven by a mechanism different from that in the continental or urban atmosphere. Under the presented experimental conditions, UV intensity and DMSO fraction were the primary factors that affected the photodegradation rate of Phe and 9,10-PhQ and altered their integrated toxicity. The findings of this study support the conclusion that the marine atmosphere is an essential field in the atmospheric transport of PAHs, in which DMSO is an important component that affects their photodegradation.
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Affiliation(s)
- Lulu Zhang
- Key Laboratory of Ecological Remediation of Lakes and Rivers and Algal Utilization of Hubei Province, School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, China; Key Laboratory of Intelligent Health Perception and Ecological Restoration of Rivers and Lakes, Ministry of Education, Hubei University of Technology, Wuhan 430068, China; Institute of Nature and Environmental Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
| | - Wenwen Yan
- Key Laboratory of Ecological Remediation of Lakes and Rivers and Algal Utilization of Hubei Province, School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, China.
| | - Shigeru Kohtani
- Faculty of Pharmacy, Hyogo Medical University, 1-3-6 Minatojima, Kobe 650-8530, Japan.
| | - Shuichi Fukuyoshi
- Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
| | - Min Hu
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, International Joint Laboratory for Regional Pollution Control, Ministry of Education (IJRC), College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
| | - Seiya Nagao
- Institute of Nature and Environmental Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
| | - Ning Tang
- Institute of Nature and Environmental Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan; Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan; College of Energy and Power, Shenyang Institute of Engineering, Shenyang 110136, China.
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Yoshioka E, Takahashi H, Miyabe H, Wanibe H, Hontani Y, Hatsuse K, Shimizu R, Kawashima A, Kohtani S. Oxidation of α,β-Unsaturated Ketones by Organophotocatalysis Using Rhodamine 6G under Visible Light Irradiation: Insight into the Reaction Mechanism. SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/a-1652-3370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
AbstractThe oxidative transformation of α,β-unsaturated ketones was investigated under visible-light-induced photocatalytic conditions using rhodamine 6G as an organophotocatalyst. In this organocatalysis, the mild co-oxidant bromotrichloromethane (BrCCl3) acts not only as a quencher toward the activated photocatalyst species, having reductant properties, but also as a brominating reagent for the intermediate radicals. This study shows that bromine atom transfer from BrCCl3 to intermediate radicals is a key step in the reaction mechanism of our oxidation method.
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Kohtani S, Kawashima A, Miyabe H. Stereoselective Organic Reactions in Heterogeneous Semiconductor Photocatalysis. Front Chem 2019; 7:630. [PMID: 31620425 PMCID: PMC6759509 DOI: 10.3389/fchem.2019.00630] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Accepted: 09/02/2019] [Indexed: 01/09/2023] Open
Abstract
The most significant feature of heterogeneous semiconductor photocatalysis is that both oxidation and reduction occur in a one-pot process. Thus, photocatalysis leads to unique redox organic reactions that cannot be achieved by conventional techniques using oxidants or reductants. Semiconductor photocatalysis is expected to be a new method for fine chemical syntheses of highly valuable molecules such as chiral medicines. However, the use of semiconductor photocatalysts in stereoselective reactions has been limited so far. This mini-review highlights recent progress in stereoselective organic reactions using semiconductor photocatalysts, briefly summarizing the enantio- and diastereoselective reactions based on the currently available literature.
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Affiliation(s)
- Shigeru Kohtani
- School of Pharmacy, Hyogo University of Health Sciences, Kobe, Japan
| | - Akira Kawashima
- School of Pharmacy, Hyogo University of Health Sciences, Kobe, Japan
| | - Hideto Miyabe
- School of Pharmacy, Hyogo University of Health Sciences, Kobe, Japan
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Yoshioka E, Inoue M, Nagoshi Y, Kobayashi A, Mizobuchi R, Kawashima A, Kohtani S, Miyabe H. Oxidative Functionalization of Cinnamaldehyde Derivatives: Control of Chemoselectivity by Organophotocatalysis and Dual Organocatalysis. J Org Chem 2018; 83:8962-8970. [DOI: 10.1021/acs.joc.8b01099] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Eito Yoshioka
- School of Pharmacy, Hyogo University of Health Sciences, Minatojima, Chuo-ku, Kobe 650-8530, Japan
| | - Maika Inoue
- School of Pharmacy, Hyogo University of Health Sciences, Minatojima, Chuo-ku, Kobe 650-8530, Japan
| | - Yuka Nagoshi
- School of Pharmacy, Hyogo University of Health Sciences, Minatojima, Chuo-ku, Kobe 650-8530, Japan
| | - Ayumi Kobayashi
- School of Pharmacy, Hyogo University of Health Sciences, Minatojima, Chuo-ku, Kobe 650-8530, Japan
| | - Rumiko Mizobuchi
- School of Pharmacy, Hyogo University of Health Sciences, Minatojima, Chuo-ku, Kobe 650-8530, Japan
| | - Akira Kawashima
- School of Pharmacy, Hyogo University of Health Sciences, Minatojima, Chuo-ku, Kobe 650-8530, Japan
| | - Shigeru Kohtani
- School of Pharmacy, Hyogo University of Health Sciences, Minatojima, Chuo-ku, Kobe 650-8530, Japan
| | - Hideto Miyabe
- School of Pharmacy, Hyogo University of Health Sciences, Minatojima, Chuo-ku, Kobe 650-8530, Japan
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Kohtani S, Kawashima A, Masuda F, Sumi M, Kitagawa Y, Yoshioka E, Hasegawa Y, Miyabe H. Chiral α-hydroxy acid-coadsorbed TiO2 photocatalysts for asymmetric induction in hydrogenation of aromatic ketones. Chem Commun (Camb) 2018; 54:12610-12613. [DOI: 10.1039/c8cc07295g] [Citation(s) in RCA: 10] [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]
Abstract
In enantioselective photohydrogenation of aromatic ketones on TiO2, the enantioselectivity is strongly affected by not only chiral reagents but also the crystalline phase, surface structure, and morphology of TiO2.
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Affiliation(s)
- Shigeru Kohtani
- Department of Pharmacy
- School of Pharmacy
- Hyogo University of Health Sciences
- Kobe
- Japan
| | - Akira Kawashima
- Department of Pharmacy
- School of Pharmacy
- Hyogo University of Health Sciences
- Kobe
- Japan
| | - Fumie Masuda
- Department of Pharmacy
- School of Pharmacy
- Hyogo University of Health Sciences
- Kobe
- Japan
| | - Momono Sumi
- Department of Pharmacy
- School of Pharmacy
- Hyogo University of Health Sciences
- Kobe
- Japan
| | - Yuichi Kitagawa
- Division of Applied Chemistry
- Faculty of Engineering
- Hokkaido University
- Sapporo 060-8628
- Japan
| | - Eito Yoshioka
- Department of Pharmacy
- School of Pharmacy
- Hyogo University of Health Sciences
- Kobe
- Japan
| | - Yasuchika Hasegawa
- Division of Applied Chemistry
- Faculty of Engineering
- Hokkaido University
- Sapporo 060-8628
- Japan
| | - Hideto Miyabe
- Department of Pharmacy
- School of Pharmacy
- Hyogo University of Health Sciences
- Kobe
- Japan
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Miyabe H, Kawashima A, Yoshioka E, Kohtani S. Frontispiece: Progress in Enantioselective Radical Cyclizations. Chemistry 2017. [DOI: 10.1002/chem.201782661] [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: 11/05/2022]
Affiliation(s)
- Hideto Miyabe
- School of Pharmacy; Hyogo University of Health Sciences, Minatojima, Chuo-ku; Kobe 650-8530 Japan
| | - Akira Kawashima
- School of Pharmacy; Hyogo University of Health Sciences, Minatojima, Chuo-ku; Kobe 650-8530 Japan
| | - Eito Yoshioka
- School of Pharmacy; Hyogo University of Health Sciences, Minatojima, Chuo-ku; Kobe 650-8530 Japan
| | - Shigeru Kohtani
- School of Pharmacy; Hyogo University of Health Sciences, Minatojima, Chuo-ku; Kobe 650-8530 Japan
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Affiliation(s)
- Hideto Miyabe
- School of Pharmacy; Hyogo University of Health Sciences, Minatojima, Chuo-ku; Kobe 650-8530 Japan
| | - Akira Kawashima
- School of Pharmacy; Hyogo University of Health Sciences, Minatojima, Chuo-ku; Kobe 650-8530 Japan
| | - Eito Yoshioka
- School of Pharmacy; Hyogo University of Health Sciences, Minatojima, Chuo-ku; Kobe 650-8530 Japan
| | - Shigeru Kohtani
- School of Pharmacy; Hyogo University of Health Sciences, Minatojima, Chuo-ku; Kobe 650-8530 Japan
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Miyabe H, Yoshioka E, Imoto Y, Yoshikawa T, Kohtani S. Iron(III) Chloride Promoted Oxidative Radical Cyclization for the Synthesis of Lactams Having a Quaternary Carbon. Synlett 2017. [DOI: 10.1055/s-0036-1588931] [Citation(s) in RCA: 3] [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: 10/20/2022]
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Yoshioka E, Kohtani S, Hashimoto T, Takebe T, Miyabe H. Photo-Induced Atom-Transfer Radical Reactions Using Charge–Transfer Complex between Iodine and Tertiary Amine. Chem Pharm Bull (Tokyo) 2017; 65:33-35. [DOI: 10.1248/cpb.c16-00814] [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: 11/22/2022]
Affiliation(s)
- Eito Yoshioka
- School of Pharmacy, Hyogo University of Health Sciences
| | | | | | - Tomoko Takebe
- School of Pharmacy, Hyogo University of Health Sciences
| | - Hideto Miyabe
- School of Pharmacy, Hyogo University of Health Sciences
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Yoshioka E, Kohtani S, Jichu T, Fukazawa T, Nagai T, Kawashima A, Takemoto Y, Miyabe H. Aqueous-Medium Carbon-Carbon Bond-Forming Radical Reactions Catalyzed by Excited Rhodamine B as a Metal-Free Organic Dye under Visible Light Irradiation. J Org Chem 2016; 81:7217-29. [PMID: 27314306 DOI: 10.1021/acs.joc.6b01102] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The utility of rhodamine B as a water-soluble organic photocatalyst was studied in the cascade radical addition-cyclization-trapping reactions under visible light irradiation. In the presence of (i-Pr)2NEt, the electron transfer from the excited rhodamine B to perfluoroalkyl iodides proceeded smoothly to promote the carbon-carbon bond-forming radical reactions in aqueous media. When i-C3F7I was employed as a radical precursor, the aqueous-medium radical reactions proceeded even in the absence of (i-Pr)2NEt. In these reactions, the direct electron transfer from the excited singlet state of rhodamine B would take place. Furthermore, the cleavage of the C-I bond in less reactive i-PrI could be achieved by the reductive electron transfer from the excited rhodamine B, which was confirmed by the fluorescence quenching of rhodamine B with the addition of i-PrI.
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Affiliation(s)
- Eito Yoshioka
- School of Pharmacy, Hyogo University of Health Sciences , Minatojima, Chuo-ku, Kobe, 650-8530, Japan
| | - Shigeru Kohtani
- School of Pharmacy, Hyogo University of Health Sciences , Minatojima, Chuo-ku, Kobe, 650-8530, Japan
| | - Takahisa Jichu
- School of Pharmacy, Hyogo University of Health Sciences , Minatojima, Chuo-ku, Kobe, 650-8530, Japan
| | - Takuya Fukazawa
- School of Pharmacy, Hyogo University of Health Sciences , Minatojima, Chuo-ku, Kobe, 650-8530, Japan
| | - Toyokazu Nagai
- School of Pharmacy, Hyogo University of Health Sciences , Minatojima, Chuo-ku, Kobe, 650-8530, Japan
| | - Akira Kawashima
- School of Pharmacy, Hyogo University of Health Sciences , Minatojima, Chuo-ku, Kobe, 650-8530, Japan
| | - Yoshiji Takemoto
- Graduate School of Pharmaceutical Sciences, Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Hideto Miyabe
- School of Pharmacy, Hyogo University of Health Sciences , Minatojima, Chuo-ku, Kobe, 650-8530, Japan
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Affiliation(s)
- Eito Yoshioka
- School
of Pharmacy, Hyogo University of Health Sciences, Minatojima, Kobe 650-8530, Japan
| | - Masatoshi Nishimura
- School
of Pharmacy, Hyogo University of Health Sciences, Minatojima, Kobe 650-8530, Japan
| | - Takashi Nakazawa
- School
of Pharmacy, Hyogo University of Health Sciences, Minatojima, Kobe 650-8530, Japan
| | - Shigeru Kohtani
- School
of Pharmacy, Hyogo University of Health Sciences, Minatojima, Kobe 650-8530, Japan
| | - Hideto Miyabe
- School
of Pharmacy, Hyogo University of Health Sciences, Minatojima, Kobe 650-8530, Japan
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Yoshioka E, Kohtani S, Tanaka E, Hata Y, Miyabe H. Carbon radical addition–cyclization reaction induced by ruthenium-photocatalyst under visible light irradiation. Tetrahedron 2015. [DOI: 10.1016/j.tet.2014.12.068] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Affiliation(s)
- Hideto Miyabe
- School of Pharmacy, Hyogo University of Health Sciences
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Kohtani S, Miyabe H, Yoshioka E, Jichu T, Fukazawa T, Nagai T, Takemoto Y. Direct Photoinduced Electron Transfer from Excited State of Rhodamine B for Carbon-Radical Generation. Synlett 2014. [DOI: 10.1055/s-0034-1379699] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
| | - Hideto Miyabe
- School of Pharmacy, Hyogo University of Health Sciences
| | - Eito Yoshioka
- School of Pharmacy, Hyogo University of Health Sciences
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Kohtani S, Kamoi Y, Yoshioka E, Miyabe H. Kinetic study on photocatalytic hydrogenation of acetophenone derivatives on titanium dioxide. Catal Sci Technol 2014. [DOI: 10.1039/c3cy00879g] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Kohtani S, Nishioka S, Yoshioka E, Miyabe H. Dye-sensitized photo-hydrogenation of aromatic ketones on titanium dioxide under visible light irradiation. CATAL COMMUN 2014. [DOI: 10.1016/j.catcom.2013.09.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Affiliation(s)
- Eito Yoshioka
- School of Pharmacy, Hyogo University of Health Sciences, Minatojima, Chuo-ku, Kobe 650-8530, Japan
| | - Hidekazu Tanaka
- School of Pharmacy, Hyogo University of Health Sciences, Minatojima, Chuo-ku, Kobe 650-8530, Japan
| | - Shigeru Kohtani
- School of Pharmacy, Hyogo University of Health Sciences, Minatojima, Chuo-ku, Kobe 650-8530, Japan
| | - Hideto Miyabe
- School of Pharmacy, Hyogo University of Health Sciences, Minatojima, Chuo-ku, Kobe 650-8530, Japan
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Yoshioka E, Kohtani S, Sawai K, Kentefu, Tanaka E, Miyabe H. Polarity-mismatched addition of electrophilic carbon radicals to an electron-deficient acceptor: cascade radical addition-cyclization-trapping reaction. J Org Chem 2012; 77:8588-604. [PMID: 22963515 DOI: 10.1021/jo3015227] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The polarity-mismatched perfluoroalkyl radical addition to electron-deficient alkenes was studied. For this study, several substrates having two polarity-different radical acceptors were employed to investigate the regiochemical courses of cascade reaction. In the case of substrate 1 having a methacryloyl moiety, we found polarity-mismatched perfluoroalkylation giving 15a-e as a major course over the polarity-matched perfluoroalkylation giving 16a-e. Moreover, in the case of substrates 2-7, perfluoroalkyl radicals selectively added to an electron-deficient alkene moiety of 2-7, to give polarity-mismatched perfluoroalkylation products without the formation of regioisomers. Next, the control of enantioselectivity was studied. In the case of substrates 1 and 3, the reaction proceeded with good enantioselectivities by employing a chiral Lewis acid, prepared from chiral box ligand 24 and Zn(OTf)(2). For direct comparison, we also studied the reaction with other carbon radicals, derived from ICH(2)CO(2)Et, ICH(2)CN, BrC(CO(2)Et)(2)Me, and CCl(3)Br, which have electrophilic character.
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Affiliation(s)
- Eito Yoshioka
- School of Pharmacy, Hyogo University of Health Sciences, Minatojima, Chuo-ku, Kobe 650-8530, Japan
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Yoshioka E, Kohtani S, Miyabe H. A Multicomponent Coupling Reaction Induced by Insertion of Arynes into the CO Bond of Formamide. Angew Chem Int Ed Engl 2011; 50:6638-42. [PMID: 21626634 DOI: 10.1002/anie.201102088] [Citation(s) in RCA: 142] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2011] [Indexed: 12/18/2022]
Affiliation(s)
- Eito Yoshioka
- School of Pharmacy, Hyogo University of Health Sciences, 1-3-6, Minatojima, Chuo-ku, Kobe, 650-8530, Japan
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Yoshioka E, Kohtani S, Miyabe H. A Multicomponent Coupling Reaction Induced by Insertion of Arynes into the CO Bond of Formamide. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201102088] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Kohtani S, Yoshioka E, Saito K, Kudo A, Miyabe H. Photocatalytic hydrogenation of acetophenone derivatives and diaryl ketones on polycrystalline titanium dioxide. CATAL COMMUN 2010. [DOI: 10.1016/j.catcom.2010.04.022] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Yoshioka E, Kohtani S, Miyabe H. Sequential Reaction of Arynes via Insertion into the π-Bond of Amides and Trapping Reaction with Dialkylzincs. Org Lett 2010; 12:1956-9. [PMID: 20361749 DOI: 10.1021/ol100387h] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Eito Yoshioka
- School of Pharmacy, Hyogo University of Health Sciences, Minatojima, Chuo-ku, Kobe 650-8530, Japan
| | - Shigeru Kohtani
- School of Pharmacy, Hyogo University of Health Sciences, Minatojima, Chuo-ku, Kobe 650-8530, Japan
| | - Hideto Miyabe
- School of Pharmacy, Hyogo University of Health Sciences, Minatojima, Chuo-ku, Kobe 650-8530, Japan
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Kohtani S, Yoshida K, Maekawa T, Iwase A, Kudo A, Miyabe H, Nakagaki R. Loading effects of silver oxides upon generation of reactive oxygen species in semiconductor photocatalysis. Phys Chem Chem Phys 2008; 10:2986-92. [DOI: 10.1039/b719913a] [Citation(s) in RCA: 63] [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] [Indexed: 11/21/2022]
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Takahashi K, Kohtani S, Nakagaki R. Magnetic field and methylene chain length effects on photochemistry of bichromophoric chain species containing 7-nitro-2-fluorenyloxy and anilino chromophores. J Photochem Photobiol A Chem 2007. [DOI: 10.1016/j.jphotochem.2007.04.007] [Citation(s) in RCA: 2] [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: 11/30/2022]
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Kitamura N, Fukagawa T, Kohtani S, Kitoh SI, Kunimoto KK, Nakagaki R. Synthesis, absorption, and fluorescence properties and crystal structures of 7-aminocoumarin derivatives. J Photochem Photobiol A Chem 2007. [DOI: 10.1016/j.jphotochem.2006.12.039] [Citation(s) in RCA: 39] [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: 10/23/2022]
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Kohtani S, Ohama Y, Ohno Y, Tsuji I, Kudo A, Nakagaki R. Photoreductive Defluorination of Hexafluorobenzene on Metal-doped ZnS Photocatalysts under Visible Light Irradiation. CHEM LETT 2005. [DOI: 10.1246/cl.2005.1056] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [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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Saigusa H, Miyakoshi N, Mukai C, Fukagawa T, Kohtani S, Nakagaki R, Gordon R. Twisted S1 excited state geometries in 4-dimethylaminobenzonitrile and dimethylaniline: New -d6 origin bands. J Chem Phys 2003. [DOI: 10.1063/1.1598959] [Citation(s) in RCA: 20] [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: 11/15/2022] Open
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Uchiyama S, Takehira K, Kohtani S, Imai K, Nakagaki R, Tobita S, Santa T. Fluorescence on-off switching mechanism of benzofurazans. Org Biomol Chem 2003; 1:1067-72. [PMID: 12929649 DOI: 10.1039/b212575g] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [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
Many fluorescent reagents with a benzofurazan (2,1,3-benzoxadiazole) skeleton have been developed and widely used in bio-analyses. In this study, we try to elucidate the fluorescence on-off switching mechanism of three fluorogenic reagents and their derivatives. Ten 4,7-disubstituted benzofurazans were used for this purpose and the measurements of their fluorescence, phosphorescence, photolysis, and time-resolved thermal lensing signal in acetonitrile were obtained in order to understand the relaxation processes of these compounds. These results indicate that the competition of fluorescence with a fast intersystem crossing or fast photoreaction plays a key role in the fluorescence on-off switching. Semi-empirical molecular orbital calculations show that the existence of the triplet n pi* state is responsible for the fast intersystem crossing while the proximity of the reactive second single pi pi* state to the first singlet pi pi* state contributes to the fast photoreaction in the excited states.
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Affiliation(s)
- Seiichi Uchiyama
- Graduate School of Pharmaceutical Sciences, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Uchiyama S, Takehira K, Kohtani S, Santa T, Nakagaki R, Tobita S, Imai K. Photophysical study of 5-substituted benzofurazan compounds as fluorogenic probes. Phys Chem Chem Phys 2002. [DOI: 10.1039/b202367a] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [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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Kohtani S, Makino S, Kudo A, Tokumura K, Ishigaki Y, Matsunaga T, Nikaido O, Hayakawa K, Nakagaki R. Photocatalytic Degradation of 4-n-Nonylphenol under Irradiation from Solar Simulator: Comparison between BiVO4and TiO2Photocatalysts. CHEM LETT 2002. [DOI: 10.1246/cl.2002.660] [Citation(s) in RCA: 123] [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: 11/13/2022]
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Kohtani S, Sugiyama M, Fujiwara Y, Tanimoto Y, Nakagaki R. Asymmetric Photolysis of 2-Phenylcycloalkanones with Circularly Polarized Light: A Kinetic Model for Magnetic Field Effects. BCSJ 2002. [DOI: 10.1246/bcsj.75.1223] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [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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Nakagawa T, Kohtani S, Itoh M. Picosecond Fluorescence and Two-Step LIF Studies of the Excited-State Proton Transfer in Methanol Solutions of 7-Hydroxyquinoline and Methyl-Substituted 7-Hydroxyquinolines. J Am Chem Soc 2002. [DOI: 10.1021/ja00135a013] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.2] [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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Okamoto H, Inishi H, Nakamura Y, Kohtani S, Nakagaki R. Erratum to “Infrared and Raman spectra of 4-(dimethylamino)benzonitrile and isotopomers in the ground state and vibrational analysis” [Chem. Phys. 260 (2000) 193–214]. Chem Phys 2002. [DOI: 10.1016/s0301-0104(02)00380-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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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Okamoto H, Kinoshita M, Kohtani S, Nakagaki R, Zachariasse KA. Picosecond Infrared Spectra and Structure of Locally Excited and Charge Transfer Excited States of Isotope-Labeled 4-(Dimethylamino)benzonitriles. BCSJ 2002. [DOI: 10.1246/bcsj.75.957] [Citation(s) in RCA: 10] [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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Mukaihata H, Nakagawa T, Kohtani S, Itoh M. Picosecond and Two-Step LIF Studies of the Excited-State Proton Transfer in 3-Hydroxyxanthone and 7-Hydroxyflavone Methanol Solutions: Reinvestigation of Tautomer and Anion Formations. J Am Chem Soc 2002. [DOI: 10.1021/ja00102a030] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [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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Kawabata H, Ohta N, Arakawa H, Ashida M, Kohtani S, Nakagaki R. Evidence for electric field-assisted back-electron transfer through a methylene bond in a linked compound of phenanthrene and phthalimide in a polymer film. J Chem Phys 2001. [DOI: 10.1063/1.1370566] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Okamoto H, Inishi H, Nakamura Y, Kohtani S, Nakagaki R. Picosecond Infrared Spectra of Isotope-Substituted 4-(Dimethylamino)benzonitriles and Molecular Structure of the Charge-Transfer Singlet Excited State. J Phys Chem A 2001. [DOI: 10.1021/jp0039363] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [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)
- Hiromi Okamoto
- Research Centre for Spectrochemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, and Faculty of Pharmaceutical Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa 920-0934, Japan
| | - Hironori Inishi
- Research Centre for Spectrochemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, and Faculty of Pharmaceutical Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa 920-0934, Japan
| | - Yuko Nakamura
- Research Centre for Spectrochemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, and Faculty of Pharmaceutical Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa 920-0934, Japan
| | - Shigeru Kohtani
- Research Centre for Spectrochemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, and Faculty of Pharmaceutical Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa 920-0934, Japan
| | - Ryoichi Nakagaki
- Research Centre for Spectrochemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, and Faculty of Pharmaceutical Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa 920-0934, Japan
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Okamoto H, Inishi H, Nakamura Y, Kohtani S, Nakagaki R. Infrared and Raman spectra of 4-(dimethylamino)benzonitrile and isotopomers in the ground state and vibrational analysis. Chem Phys 2000. [DOI: 10.1016/s0301-0104(00)00243-3] [Citation(s) in RCA: 43] [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: 11/30/2022]
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Kurono M, Mitsuhashi C, Kohtani S, Itoh M. Formation and Photodissociation of a Jet-Cooled Intramolecular Exciplex in the Bichromophoric EDA System: Multiconformations and Deuteration Effect. J Phys Chem A 1997. [DOI: 10.1021/jp9640639] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Makoto Kurono
- Department of Physical and Chemical Biodynamics, Faculty of Pharmaceutical Sciences, Kanazawa University, Takara-machi, Kanazawa 920, Japan
| | - Chiaki Mitsuhashi
- Department of Physical and Chemical Biodynamics, Faculty of Pharmaceutical Sciences, Kanazawa University, Takara-machi, Kanazawa 920, Japan
| | - Shigeru Kohtani
- Department of Physical and Chemical Biodynamics, Faculty of Pharmaceutical Sciences, Kanazawa University, Takara-machi, Kanazawa 920, Japan
| | - Michiya Itoh
- Department of Physical and Chemical Biodynamics, Faculty of Pharmaceutical Sciences, Kanazawa University, Takara-machi, Kanazawa 920, Japan
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Kurono M, Mitsuhashi C, Kohtani S, Itoh M. Photodissociation of Jet-Cooled Intramolecular Exciplex in 1-(9-Anthryl)-3-(p-(N,N-dimethylamino)phenyl)propane: Formation of Excited-State Anthryl and Deuteration Effect. J Phys Chem A 1997. [DOI: 10.1021/jp961795s] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [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)
- Makoto Kurono
- Department of Physical and Chemical Biodynamics, Graduate School and Faculty of Pharmaceutical Sciences, Kanazawa University, Takara-machi, Kanazawa 920, Japan
| | - Chiaki Mitsuhashi
- Department of Physical and Chemical Biodynamics, Graduate School and Faculty of Pharmaceutical Sciences, Kanazawa University, Takara-machi, Kanazawa 920, Japan
| | - Shigeru Kohtani
- Department of Physical and Chemical Biodynamics, Graduate School and Faculty of Pharmaceutical Sciences, Kanazawa University, Takara-machi, Kanazawa 920, Japan
| | - Michiya Itoh
- Department of Physical and Chemical Biodynamics, Graduate School and Faculty of Pharmaceutical Sciences, Kanazawa University, Takara-machi, Kanazawa 920, Japan
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Kohtani S, Sugita C, Itoh M. Resonance Energy Transfer from the Lowest Excited Triplet State of Diphenylcarbene to Dye Molecules: Utilization for the Characterization of the Triplet−Triplet Fluorescence. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp961881s] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shigeru Kohtani
- Department of Physical and Chemical Biodynamics, Graduate School, and Faculty of Pharmaceutical Sciences, Kanazawa University, Takara-machi, Kanazawa 920, Japan
| | - Chizuko Sugita
- Department of Physical and Chemical Biodynamics, Graduate School, and Faculty of Pharmaceutical Sciences, Kanazawa University, Takara-machi, Kanazawa 920, Japan
| | - Michiya Itoh
- Department of Physical and Chemical Biodynamics, Graduate School, and Faculty of Pharmaceutical Sciences, Kanazawa University, Takara-machi, Kanazawa 920, Japan
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Kohtani S, Kudo A, Sakata T. Spectral sensitization of a TiO2 semiconductor electrode by CdS microcrystals and its photoelectrochemical properties. Chem Phys Lett 1993. [DOI: 10.1016/0009-2614(93)85535-v] [Citation(s) in RCA: 100] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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