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Ohkubo, Kei,Kawashima, Yuki,Fukuzumi, Shunichi The Royal Society of Chemistry 2012 Chemical communications Vol.48 No.36
<P>A supramolecular binding occurred between lithium ion encapsulated [60]fullerene (Li<SUP>+</SUP>@C<SUB>60</SUB>) and sulfonated tetraphenylporphyrins ([MTPPS]<SUP>4−</SUP> M = H<SUB>2</SUB> and Zn) in a benzonitrile solution. Photoexcitation of Li<SUP>+</SUP>@C<SUB>60</SUB>/[MTPPS]<SUP>4−</SUP> results in formation of a long-lived charge-separated state by photoinduced electron transfer.</P> <P>Graphic Abstract</P><P>Supramolecular complexes were formed between lithium ion encapsulated [60]fullerene (Li<SUP>+</SUP>@C<SUB>60</SUB>) and sulfonated tetraphenylporphyrins in benzonitrile, affording the long-lived triplet charge-separated state by photoinduced electron transfer. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cc31186k'> </P>
Ohkubo, Kei,Kawashima, Yuki,Sakai, Hayato,Hasobe, Taku,Fukuzumi, Shunichi The Royal Society of Chemistry 2013 Chemical communications Vol.49 No.40
<P>A photoelectrochemical solar cell composed of supramolecular nanoclusters of lithium encapsulated fullerene and zinc sulphonated <I>meso</I>-tetraphenylporphyrin exhibits significant enhancement in the photoelectrochemical performance as compared with the reference system containing only a single component.</P> <P>Graphic Abstract</P><P>A photoelectrochemical solar cell composed of supramolecular nanoclusters of Li<SUP>+</SUP>@C<SUB>60</SUB> and ZnTPPS<SUP>4−</SUP> exhibits significant enhancement in the photoelectrochemical performance. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cc41187g'> </P>
Ohkubo, Kei,Fujimoto, Atsushi,Fukuzumi, Shunichi Royal Society of Chemistry 2011 Chemical communications Vol.47 No.30
<P>Photooxygenation of cyclohexane by O<SUB>2</SUB> occurs efficiently under visible-light irradiation of an O<SUB>2</SUB>-saturated acetonitrile solution containing 9-mesityl-10-methylacridinium ions (Acr<SUP>+</SUP>–Mes) and HCl to yield cyclohexanone, cyclohexanol and hydrogen peroxide. The photocatalytic reaction is initiated by electron transfer from Cl<SUP>−</SUP> to the mesitylene radical cation moiety.</P> <P>Graphic Abstract</P><P>Photooxygenation of cyclohexane by O<SUB>2</SUB> occurs efficiently under visible-light irradiation of an O<SUB>2</SUB>-saturated acetonitrile solution containing 9-mesityl-10-methylacridinium ions (Acr<SUP>+</SUP>–Mes) and HCl to yield cyclohexanone, cyclohexanol and hydrogen peroxide. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1cc12534f'> </P>
Ohkubo, Kei,Mizushima, Kentaro,Iwata, Ryosuke,Fukuzumi, Shunichi Royal Society of Chemistry 2011 Chemical Science Vol.2 No.4
<P>Photocatalytic bromination of aromatic hydrocarbons by molecular oxygen with hydrogen bromide occurs efficiently to produce monobrominated products selectively using 9-mesityl-10-methylacridinium ion (Acr<SUP>+</SUP>–Mes) as a photocatalyst under visible light irradiation. Both the product yield and selectivity for the bromination of 1,3,5-trimethoxybenzene were 100% with a quantum yield of 4.8%. The photocatalytic turnover number is 900 based on the initial concentration of Acr<SUP>+</SUP>–Mes. The reactive radical intermediates involved in the photocatalytic cycle have been successfully detected by laser flash photolysis measurements. The photocatalytic bromination is initiated by photoinduced electron transfer from the mesitylene moiety to the singlet excited state of acridinium ion, which results in formation of the electron-transfer state of Acr<SUP>+</SUP>–Mes (Acr˙–Mes˙<SUP>+</SUP>), followed by electron transfer from aromatic hydrocarbons to the mesitylene radical cation moiety and electron transfer from the acridinyl radical moiety to O<SUB>2</SUB>. The resulting radical cations of aromatic hydrocarbons react with Br<SUP>−</SUP> to produce the corresponding monobrominated products selectively.</P> <P>Graphic Abstract</P><P>Photocatalytic bromination of aromatic hydrocarbons by O<SUB>2</SUB> with HBr occurs efficiently to produce the monobrominated products using 9-mesityl-10-methylacridinium ion. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0sc00535e'> </P>
Superconducting Tunnel Junction Detectors for Mass Spectrometry
Ohkubo, M.,Zen, N.,Kitazume, T.,Ukibe, M.,Shiki, S.,Koike, M. The Korean Superconductivity Society 2012 Progress in superconductivity Vol.14 No.2
With conventional mass spectrometry (MS), ions are separated according to mass/charge (m/z) ratios. We must speculate the z values to obtain the m values. Superconducting tunnel junction (STJ) detectors can solve this problem, and true mass spectrometry becomes possible instead of m/z spectrometry. The STJ detectors were installed in MS instruments with a variety of ion sources. As an example, we report fragmentation analysis of a non-covalent protein complex of hemoglobin.
Ohkubo, Kei,Mizushima, Kentaro,Iwata, Ryosuke,Souma, Kazunori,Suzuki, Nobuo,Fukuzumi, Shunichi Royal Society of Chemistry 2010 Chemical communications Vol.46 No.4
<P>Photooxygenation of <I>p</I>-xylene by oxygen occurs efficiently under photoirradiation of 9-mesityl-2,7,10-trimethylacridinium ion (Me<SUB>2</SUB>Acr<SUP>+</SUP>–Mes) to yield <I>p</I>-tolualdehyde and hydrogen peroxide, which is initiated <I>via</I> photoinduced electron transfer of Me<SUB>2</SUB>Acr<SUP>+</SUP>–Mes to produce the electron-transfer state.</P> <P>Graphic Abstract</P><P>Photooxygenation of <I>p</I>-xylene by oxygen occurs efficiently under photoirradiation of mesitylacridinium in an O<SUB>2</SUB>-saturated acetonitrile solution to yield <I>p</I>-tolualdehyde and hydrogen peroxide. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b920606j'> </P>
Introduction to IEC Standardization for Superconducting Sensors and Detectors
Ohkubo, M. The Korean Superconductivity Society 2012 Progress in superconductivity Vol.14 No.2
Superconducting sensors and detectors have been applied to many fields or beginning to enter the maturing stage. The applications spread over a wide range of fields such as radio telescope, medical examination, quantum information, contamination inspection, materials analysis, etc. For users of the superconducting devices as well as developers, we have to avoid confusion of naming, graphical circuit symbols, and measurement methods for device performance. We are trying to formulate international standards under the International Electrotechnical Commission - Technical Committee 90 (IEC-TC90), which is responsible for superconductivity. The sensors and detectors to be considered are divided into two groups: coherent sensors (SQUID, SIS mixers, etc.) and direct detectors (TES, STJ, MKID, SSPD, etc.).
Direct Oxygenation of Benzene to Phenol Using Quinolinium Ions as Homogeneous Photocatalysts
Ohkubo, Kei,Kobayashi, Takaki,Fukuzumi, Shunichi WILEY‐VCH Verlag 2011 Angewandte Chemie Vol.123 No.37
<P><B>Die Oxidation von Benzol</B> zu Phenol mit Sauerstoff und Wasser erfolgte in Gegenwart des 3‐Cyano‐1‐methylchinoliniumions als Photokatalysator unter Normalbedingungen (siehe Bild). Der Reaktionsmechanismus wurde durch Detektion des π‐dimeren Benzolradikalkations, das beim lichtinduzierten Elektronentransfer von Benzol zum Photokatalysator entsteht, und durch Beobachtung der Reaktion von Radikalkationen mit Wassermolekülen aufgeklärt.</P>