A5061209619- Radical Photochemical Reactions
- Photochemistry and Electron Transfer Studies
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Luminescence and Fluorescent Materials
- Oxidative Organic Chemistry Reactions
- Organic Light-Emitting Diodes Research
- Porphyrin and Phthalocyanine Chemistry
- Crystallography and molecular interactions
- Fluorine in Organic Chemistry
- Photochromic and Fluorescence Chemistry
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Molecular Sensors and Ion Detection
- Molecular Junctions and Nanostructures
- Mathematical Dynamics and Fractals
- Synthesis and Properties of Aromatic Compounds
- Advanced Chemical Physics Studies
- Organic Electronics and Photovoltaics
- Organic Chemistry Cycloaddition Reactions
- Quantum Chromodynamics and Particle Interactions
- Cyclopropane Reaction Mechanisms
- Free Radicals and Antioxidants
- CO2 Reduction Techniques and Catalysts
- Geometric and Algebraic Topology
Osaka Metropolitan University
2022-2025
Tokyo Metropolitan University
2022-2025
Hitachi (Japan)
2007-2025
Optimization Technology (United States)
2024
Fujitsu (Japan)
2006-2024
Robotics Research (United States)
2024
Shibuya (Japan)
2023
Osaka Prefecture University
2013-2022
Osaka Health Science University
2017
Cambridge University Press
2017
A Zr-based metal–organic framework with tetrakis(carboxyphenyl)porphyrin groups catalyzes oxidative hydroxylation of arylboronic acids as a photoredox catalyst.
Singlet fission (SF) is expected to exceed the theoretical limit of solar cell efficiency. Quintet (Q) state generation in triplet-triplet pair essential for preventing unwanted loss SF-born multiexciton through singlet channels, although little known on primary spin dynamics following intermolecular SF. In this study, time-resolved EPR revealed dynamics, energetics and geometries aggregated 6,13-bis(triisopropylsilylethynyl)pentacene 2-phenyl-6,11-bis(triisopropylsilylethynyl)tetracene...
Abstract The crystal‐packing structures of seven derivatives diaroylmethanatoboron difluoride ( 1 a – gBF 2 ) are characterized by no overlap the π‐conjugated main units two adjacent molecules (type I), benzene ring π‐orbitals II), and dihydrodioxaborinine rings III). govern fluorescence (FL) properties in crystalline states. FL domain that is present type I crystals, which intermolecular orbital interactions absent, leads to excited monomer‐like properties. In case II presence generates new...
An adamantane-linked tetracene dyad (Tc-Ad-Tc) undergoes exergonic intramolecular singlet fission (SF), producing long-lived (τ = 175 μs) and high-energy (2 × 1.03 eV) multiexciton. Time-resolved absorption, fluorescence decay, electron paramagnetic resonance (EPR) spectroscopic analysis revealed that the triplet species is generated in this system via a correlated pair having quintet characteristics. EPR formation of syn anti conformers quintet, i.e., 5(3Tc-Ad-3Tc)*. The generation requires...
ABSTRACT High‐reliability assembly techniques for miniaturized in‐line pressure sensor with diaphragm using a thin strain have been developed to monitor the hydraulic in pipetting such as dispensing devices. The has two problems, (i) water leakage and (ii) sensitivity reduction by adding pressure. These problems were clarified generate tensile stress adhesive (Ag paste) peeling from SUS housing. To overcome these Ag paste was needed keep compressive even when In this paper, pressing...
The detailed mechanism of photoinduced decarboxylative radical addition to alkenes using both the effect an electron donor (ED)/electron acceptor (EA) and laser flash photolysis in a two-molecule photoredox system was investigated. concentration EA•- played important role photoreaction could be controlled by varying concentrations ED/EA their identity, which influenced ΔGPET. Higher larger negative ΔGPET led higher EA•-, thereby increasing yield adduct; however, large for generation EDA...
Laboratory experiments, in which two different sized materials were continuously fed into a flume, revealed that longitudinal sediment sorting produced rhytmic fluctuation the bedload transport rates. Bedload pulsation was immediately noticeable for conditions finer size fraction poor mixture. Three types of bed state—congested, transitional and smooth—repeated along channel an orderly manner; this is sorting.Abundant sand particles thoroughly filled up interstices gravel framework smooth...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew aspects of fluorescence quenching by molecular oxygenKoichi Kikuchi, Chika Sato, Masanori Watabe, Hiroshi Ikeda, Yasutake Takahashi, and Tsutomu MiyashiCite this: J. Am. Chem. Soc. 1993, 115, 12, 5180–5184Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June 1993https://pubs.acs.org/doi/10.1021/ja00065a033https://doi.org/10.1021/ja00065a033research-articleACS PublicationsRequest reuse...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuenching mechanism in a highly exothermic region of the Rehm-Weller relationship for electron-transfer fluorescence quenchingKoichi Kikuchi, Taeko Niwa, Yasutake Takahashi, Hiroshi Ikeda, and Tsutomu MiyashiCite this: J. Phys. Chem. 1993, 97, 19, 5070–5073Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue 1...
In the photoreaction of benzophenones with 1,3-dimethyl-2-phenylbenzimidazoline (DMPBI), benzhydrols were major products. Addition H2O accelerated reaction no change in product distribution, while AcOH, PhOH, and metal salts such as LiClO4 Mg(ClO4)2 effective additives to produce benzpinacols. contrast, benzpinacols exclusively formed regardless solvent additive reactions 2-(o-hydroxyphenyl)-1,3-dimethylbenzimidazoline (o-HPDMBI). These observations are consistent hypothesis that DMPBI•+...
The results of an investigation the thermoluminescence (TL) and electroluminescence (EL) arylated methylenecyclopropanes 1, systems whose photoinduced electron-transfer (PET) chemistry has been thoroughly studied, are described. In both TL EL experiments with electronically excited triplet trimethylenemethane (TMM) biradicals (3)2** generated by back electron transfer (charge recombination) a TMM radical cation (hole) 2*+, formed isomerization substrate (hole, 1*+). application this to...
We investigated the influence of lactosucrose on intestinal flora healthy volunteers. Eight volunteers (male:female = 4:4, age 34 +/- 4 years) received 6 g daily for 8 weeks. Fecal microflora, bacterial metabolites, pH, and moisture were analyzed before after administration lactosucrose. The results showed that number percentage Bifidobacterium sp. in relation to total bacteria significantly increased during period administration. Although fecal putrefactive products, fatty acids, content,...
To distinguish between dissociation of a B−N coordination bond by SN1- and SN2-type mechanisms, two series 1,3,2-dioxaborolanes (boronates) BEt2 (borane) complexes carrying 2,6-bis((dimethylamino)methyl)phenyl group as third substituent were synthesized the reaction corresponding organolithium compound with an appropriate boron reagent. In solid state, boronate complex exhibits structure in which only one NMe2 is coordinated to tetracoordinated atom according X-ray analysis solid-state NMR....
Abstract 3,3,4,4‐Tetaaryldihydro[5]helicenes ( 1 ) and 1,1′‐binaphthyl‐2,2′‐diylbis(diarylcarbenium)s 2 2+ can be reversibly interconverted upon electron transfer, which is accompanied by a vivid color change (electrochromism) as well the formation/cleavage of CC bond (“dynamic redox behavior”). Because only neutral donor exhibits strong fluorescence, electrochemical input further modify fluorescent properties pair. Due to configurational stability helicity in axial chirality , reaction...