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Enhanced charge transfer kinetics in multi-chromophoric porphyrins using tri-dimensional donors

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Enhanced charge transfer kinetics in multi-chromophoric porp...

Operationally Simple Enantioselective Silane Reduction of Ketones by the [Ir(OMe)(cod)]₂/Azolium Catalytic System

中国化学会第四届卟啉与酞菁学术研讨会

作者： Long Zhao Pawel Wagner Xu Liang Zhaoli Xue Weihua Zhu Keith C.Gordon shogo mori Attila J.Mozer School of Chemistry and Chemical Engineering Jiangsu University ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research InstituteUniversity of Wollongong MacDiarmid Institute for Advanced Materials and Nanotechnology Department of ChemistryUniversity of Otago Division of Chemistry and Materials Faculty of Textile Science and TechnologyShinshu University

Charge transfer pathways and kinetics at electrolyte/dye/TiO2 interface are paramount to the sensitizer structure *** kinetics of oxidized dyes absorbed on semiconductor surfaces has been primarily modeled based on the free energy difference between the oxidation potential of the dye and the redox potential of *** a few mechanisms have been demonstrated to enhance the kinetics by other *** this work,the rate constant of the reduction of oxidized porphyrin dye is enhanced by attaching non-conjugated carbaozole triphenylamine moiety without enlarging the free energy difference of the *** results are obtained using transient absorption spectroscopy by selectively probing the regeneration kinetics at the porphyrin cation and the organic dye radical cation absorption *** suggest the reason to the more exposed dye cation radical orbitals of the multi-chromophoric *** findings provide a possible approach to design new dyes with fast reduction kinetics and minimal losses to the electrochemical potential,leading to better solar energy conversion efficiencies in photon-driven electrochemical cells.

关键词： tri-dimensional donor multi-chromophores charge transfer dye regeneration

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International Journal of Organic Chemistry 2024年第1期14卷 1-19页

作者： Satoshi Sakaguchi Chika Nagao Ryo Ichihara shogo Matsuo Department of Chemistry and Materials Engineering Faculty of Chemistry Materials and Bioengineering Kansai University Suita Japan

An operationally simple protocol was designed for the enantioselective silane reduction (ESR) of ketones using air- and moisture-stable [Ir(OMe)(cod)]2 (cod = 1,5-cyclooctadiene) (3) as a metal catalyst precursor. This reaction was driven by chiral hydroxyamide-functionalized azolium salt 2. The catalytic ESR reaction could be performed under benchtop conditions at room temperature. Treatment of 2 with 3 in THF yielded the monodentate IrCl(NHC)(cod) (NHC = N-heterocyclic carbene) complex 4 in 93% yield, herein the anionic methoxy ligand of 3 serves as an internal base that deprotonates the azolium ring of 2. The well-defined Ir complex 4 catalyzed the ESR reaction of propiophenone (6) with (EtO)2MeSiH using the pre-mixing reaction procedure. Based on this success, the catalytic ESR reaction was designed and implemented using an in situ-generated NHC/Ir catalyst derived from 2 and 3. Thus, a wide variety of aryl ketones could be reduced to the corresponding optically active alcohols in moderate to excellent stereoselectivities at room temperature without temperature control. Since the high catalytic activity of 3 was observed, we next evaluated several other transition metal catalyst precursors for the catalytic ESR reaction under the influence of 2. This evaluation revealed that Ir(acac)(cod) (acac = acetylacetonate) (28) and [IrCl(cod)]2 (5) can be successfully used as metal catalyst precursors in the ESR reaction.

关键词： Asymmetric Catalysis Enantioselective Reduction Hydrosilylation Reaction N-Heterocyclic Carbene Iridium

Dissipative structure for symmetric hyperbolic systems with memory

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Science China Mathematics 2018年第11期61卷 2053-2064页

作者： Shuichi Kawashima shogo Taniue Faculty of Mathematics Kyushu University Graduate School of Mathematics Kyushu University

We study symmetric hyperbolic systems with memory-type dissipation and investigate their dissipative *** treat two cases:memory-type diffusion and memory-type relaxation,and observe that the dissipative structures of these two cases are essentially ***,we show that the dissipative structure of the system with memory-type diffusion is of the standard type,while that of the system with memory-type relaxation is of the regularity-loss type.

关键词： hyperbolic systems memory-type dissipation dissipative structure

A study on particle breakage behavior during pile penetration process using acoustic emission source location

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Geoscience Frontiers 2020年第2期11卷 413-427页

作者： Wuwei Mao shogo Aoyama Ikuo Towhata Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China Key Laboratory of Geotechnical and Underground Engineering Ministry of EducationTongji UniversityShanghai 200092China Kiso-Jiban Consultants Co. Ltd.TokyoJapan Department of Civil Engineering University of TokyoTokyoJapan

Particle breakage is a common occurrence in granular systems when the external stress exceeds the individual particle strength.A large number of experimental evidences suggested that particle breakage may significantly influence the soil *** the case of pile foundations,the subsoil below the pile tip experiences considerable high stress and consequently prone to *** to the lack of sufficient understanding on particle breakage mechanism,there is currently no consentaneous theoretical background for particle breakage analysis during the pile penetration *** study aims to clarify the location of particle breakage and its evolving characteristics with the aid of acoustic emission(AE)source location *** spatial distribution of AE hypocenters is interpreted to be associated with the mechanism of particle *** showed that the AE sources were not uniformly distributed,but concentrated within certain zones below the pile *** AE concentration zone was pushed downward with the advancing pile tip,and its distance from the real time pile tip position decreased after certain depth of pile *** location of particle breakage interpreted from AE source location was verified with posttest excavations and the insights on the particle breakage evolution zone were further discussed.

关键词： Acoustic emission Source location Sand Particle breakage Pile

Operationally Simple Enantioselective Silane Reduction of Ketones by the [Ir(OMe)(cod)]2/Azolium Catalytic System

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PMSSC:Parallelizable multi-subset based self-expressive model for subspace clustering

International Journal of Organic Chemistry（有机化学国际期刊） 2024年第1期 1页

作者： Satoshi Sakaguchi Chika Nagao Ryo Ichihara shogo Matsuo

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Computational Visual Media 2023年第3期9卷 479-494页

作者： Katsuya Hotta Takuya Akashi shogo Tokai Chao Zhang Department of Engineering University of FukuiFukui-shi 910-8507Japan Faculty of Science and Engineering Iwate UniversityMorioka-shi 020-8551Japan

Subspace clustering methods which embrace a self-expressive model that represents each data point as a linear combination of other data points in the dataset provide powerful unsupervised learning ***,when dealing with large datasets,representation of each data point by referring to all data points via a dictionary suffers from high computational *** alleviate this issue,we introduce a parallelizable multi-subset based self-expressive model(PMS)which represents each data point by combining multiple subsets,with each consisting of only a small proportion of the *** adoption of PMS in subspace clustering(PMSSC)leads to computational advantages because the optimization problems decomposed over each subset are small,and can be solved efficiently in ***,PMSSC is able to combine multiple self-expressive coefficient vectors obtained from subsets,which contributes to an improvement in *** experiments on synthetic and real-world datasets show the efficiency and effectiveness of our approach in comparison to other methods.

关键词： subspace clustering self-expressive model big data subsetting

Locally infiltrative inflammatory fibroid polyp of the ileum:report of a case showing transmural proliferation

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Gastroenterology Report 2018年第2期6卷 144-148,I0003页

作者： shogo Tajima Kenji Koda Department of Pathology Shizuoka Saiseikai General HospitalShizuokaJapan and 2Department of PathologyFujieda Municipal General HospitalShizuokaJapan

Morphologically,an inflammatory fibroid polyp(IFP)is usually centred in the *** of an IFP to the subserosa with destruction of the muscularis propria is exceedingly ***,we describe a 70-year-old woman who presented with right lower abdominal pain but was finally diagnosed with an ***-enhanced computed tomography revealed a target-like structure with a hypovascular mass at the leading edge,which was consistent with intussusception due to a *** surgery,the resected specimen displayed a mass measuring 4×3×3 cmthat was protruding into the ***,the mass was centred in the submucosa,extending up to the mucosal surface and down to the subserosa and *** muscularis mucosae and muscularis propria were destroyed focally.A PDGFRA gene mutation in exon 2(1837_1851 del)that was found in this case,as well as a highly infiltrative growth pattern,strongly supported the neoplastic nature of IFP.

关键词： inflammatory fibroid polyp transmural proliferation subserosa serosa

Fresh frozen plasma transfusion does not affect outcomes following hepatic resection for hepatocellular carcinoma

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World Journal of Gastroenterology 2010年第44期16卷 5603-5610页

作者： Yoshito Tomimaru Hiroshi Wada Shigeru Marubashi shogo Kobayashi Hidetoshi Eguchi Yutaka Takeda Masahiro Tanemura Takehiro Noda Koji Umeshita Yuichiro Doki Masaki mori Hiroak Nagano Department of Surgery Graduate School of Medicine Osaka University Division of Health Sciences Graduate School of MedicineOsaka University

AIM:To investigate whether fresh frozen plasma (FFP) transfusion affects outcomes following hepatic resection for hepatocellular carcinoma (HCC) in terms of liver function,postoperative complications and cancer ***:We retrospectively compared the incidence of postoperative complications between 204 patients who underwent hepatectomy for HCC with routine FFP transfusion in an early period (1983-1993,Group A) and 293 with necessity for FFP transfusion during a later period (1998-2006,Group B),and also between two subgroups of Group B [22 patients with FFP transfusion (Group B1) and 275 patients without FFP transfusion (Group B2)].Additionally,only in limited patients in Group B1 and Group B2 with intraoperative blood loss≥ 2000 mL (Group B1 ≥ 2000 mL and Group B2 ≥ 2000 mL),postoperative complications,liver function tests,and cancer prognosis were ***:No mortality was registered in Group B,compared to 8 patients (3.9%) of Group *** incidence of morbidity in Group B2 [23.2% (64/275)] was not significantly different from Group B1 [40.9% (9/22)] and Group A [27.0% (55/204)].The incidence of complications and postoperative liver function tests were comparable between Group B1 ≥ 2000 mL vs Group B2 ≥ 2000 *** prognosis did not correlate with administration of FFP,but with tumor-related ***:The outcome of hepatectomy for HCC is not influenced by FFP *** suggest FFP transfusion be abandoned in patients who undergo hepatectomy for HCC.

关键词： Fresh frozen plasma Hepatocellular carcinoma Surgery Transfusion

A novel use of TiO_2 fiber for photocatalytic ozonation of 2,4-dichlorophenoxyacetic acid in aqueous solution

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Journal of Environmental Sciences 2008年第9期20卷 1138-1145页

作者： GIRI Rabindra Raj OZAKI Hiroaki TAKANAMI Ryohei TANIGUCHI shogo New Industrial R & D Center Osaka Sangyo University Department of Civil Engineering Osaka Sangyo University

More efficient oxidation methods are needed to degrade especially newly emerging recalcitrant organic contaminants at low concentrations in the water environment. Reduced photonic efficiency of immobilized TiO2 is a major challenge in TiO2-assisted advanced oxidation processes (AOP). Mineralization of 2,4-dichllorophenoxyacetic acid (2,4-D) in low aqueous solution by O3/UV/TiO2 using the world’s first high-strength TiO2 fiber was investigated and compared with O3, UV/TiO2, and O3/TiO2 in laboratory batch ex...

关键词： dechlorination degradation intermediates radicals TiO2 total organic carbon (TOC)