A5070867634- Ionic liquids properties and applications
- Electrochemical Analysis and Applications
- Transition Metal Oxide Nanomaterials
- Catalysis and Oxidation Reactions
- Analytical Chemistry and Sensors
- Asymmetric Hydrogenation and Catalysis
- Inorganic and Organometallic Chemistry
- Chemical and Physical Properties in Aqueous Solutions
- Catalytic Processes in Materials Science
- Sulfur-Based Synthesis Techniques
- Synthesis of β-Lactam Compounds
- Extraction and Separation Processes
- Chemical Synthesis and Analysis
- Molten salt chemistry and electrochemical processes
- Catalytic C–H Functionalization Methods
- Chemical Synthesis and Reactions
- Gas Sensing Nanomaterials and Sensors
- Synthesis and Reactivity of Sulfur-Containing Compounds
- CO2 Reduction Techniques and Catalysts
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Conducting polymers and applications
- Electrodeposition and Electroless Coatings
- Polyoxometalates: Synthesis and Applications
- Radioactive element chemistry and processing
The University of Tokyo
2023-2024
Kyushu University
2019
Nagoya University
2011-2017
Keio University
2006-2015
University of Fukui
2014
Yamagata University
1992-2013
Osaka University
2011
Iwate University
2009-2010
Kyoto University
2010
University of Hawaiʻi at Mānoa
2008
Abstract We demonstrate nanoscale architectures in real biominerals and their biomimetics. Mimicking biomineralization, that is, crystal design association with organic molecules, has been demonstrated recent years. Although the macroscopic morphologies biomimetics have extensively studied, nanoscopic structures terms of growth are still not fully understood. show both materials form oriented bridged nanocrystals incorporated polymers. The by polymers is a significant step for understanding...
A virtually salt-free and straightforward bimolecular assembly giving N-unsubstituted pyrroles through fully unmasked α-amino aldehydes, which was enabled by the dual effects of a catalytic ruthenium complex an alkali metal base, is reported. Either solvent-free or acceptorless dehydrogenation facilitates high atom, step, pot economy, are otherwise difficult to achieve in multistep operations involving protection/deprotection.
Abstract γ-Amino acids can play important roles in the biological activities of natural products; however, ribosomal incorporation γ-amino into peptides is challenging. Here we report how a selection campaign employing non-canonical peptide library containing cyclic γ 2,4 -amino resulted discovery very potent inhibitors SARS-CoV-2 main protease (M pro ). Two kinds acids, cis -3-aminocyclobutane carboxylic acid (γ 1 ) and (1 R ,3 S )-3-aminocyclopentane 2 ), were ribosomally introduced...
Abstract Due to their constrained conformations, cyclic β2,3-amino acids (cβAA) are key building blocks that can fold peptides into compact and rigid structures, improving peptidase resistance binding affinity target proteins, due conformations. Although the translation efficiency of cβAAs is generally low, our engineered tRNA, referred as tRNAPro1E2, enabled efficient incorporation peptide libraries using flexible in vitro (FIT) system. Here we report on design application a macrocyclic...
The electrochemical reduction of oxygen was investigated in some hydrophobic room-temperature molten salt systems (ionic liquids) consisting bis(trifluoromethanesulfone)imide anion with trimethyl-n-hexylammonium 1-butyl-1-methylpyrrolidinium 1-ethyl-3-methylimidazolium or 1,2-dimethyl-3-propylimidazolium cation. dissolved these melts reduced to the superoxide ion on a gold electrode. stable against aliphatic and alicyclic organic cations but reacted aromatic ones suggesting that nucleophilic...
The electrochemical behavior of samarium (Sm), europium (Eu), and ytterbium (Yb) was investigated in the hydrophobic room-temperature molten salts based on bis(trifluoromethylsulfonyl)imide combined with either 1-ethyl-3-methylimidazolium or 1--butyl-1-methylpyrrolidinium . redox reactions , were observed at vs respectively. In all cases, electrode found to be quasi- irreversible by cyclic voltammetry. diffusion coefficients these lanthanides estimated chronoamperometry chronopotentiometry,...
The electrochemical behavior of oxygen /superoxide ion couple was investigated with the aid ultramicroelectrode technique in 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (BMPTFSI) room-temperature molten salt (ionic liquid). diffusion coefficient at . activation energy process estimated to be from temperature dependence coefficient. solubility BMPTFSI and decreased an increase temperature. formal potential vs ferrocene/ferrocenium.
The electrodeposition of cobalt was investigated in an ionic liquid, 1--butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide. overpotential for the Co reduced remarkably by elevating temperature up to , probably due change coordination environment species. addition acetone led decrease overpotential, indicating selective cation with enhanced charge transfer rate. It has been suggested that and crystal growth liquid are affected dissolved metal species structure electric double layer.
Amides are ubiquitous and abundant in nature our society, but very stable reluctant to salt-free, catalytic chemical transformations. Through the activation of a "sterically confined bipyridine-ruthenium (Ru) framework (molecularly well-designed site confine adsorbed H2 in)" precatalyst, hydrogenation formamides through polyamide is achieved under wide range reaction conditions. Both C=O bond C-N cleavage lactam became also possible using single precatalyst. That is, catalyst diversity...
A room-temperature molten salt, 1-ethyl-3-methylimidazolium tetrafluoroborate with adequate purity was obtained simply by the reaction of chloride and tetrafluoroboric acid. Silver dissolves up to ∼0.2 mol dm−3 in at room temperature. Electrochemical deposition dissolution silver on a platinum electrode were found possible containing The reduction monovalent species is electrochemically irreversible, rate constant being estimated be cm s−1. diffusion coefficient Ag(I) calculated cm2 s−1,...
New efficient synthetic methods of optically active BINAP [BINAP = 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl] and its variants are described. Application these in asymmetric catalytic hydrogenation prochiral ketones olefins to various industrially important compounds is discussed.
Reaction entropies of some metal complex redox couples in an amide-type room-temperature ionic liquid, 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide (BMPTFSA) have been estimated by measuring the thermoelectromotive force at a non-isothermal cell. It is suggested that reaction entropy dependent on difference charge densities oxidant and reductant couple, probably related to coulombic interaction between species ions composing liquid.
The electrode kinetics of , and on a platinum was investigated over the temperature range from in room-temperature ionic liquid, 1--butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (BMPTFSI). average activation energy for diffusion coefficients these complexes which close to viscosity BMPTFSI. were found be affected not only by BMPTFSI but also charge complexes. On other hand, heterogeneous rate constants redox reactions estimated electrochemical impedance spectroscopy. apparent...
Electrodeposition of Ag was studied in several ionic liquids. When the potential applied more negative than −0.25 V vs. | Ag(I), cathodic current density reached diffusion-controlled region. The surface morphology deposits, initial stage nucleation and crystal growth behavior apparent efficiency changed depending on potential. These results indicate that affects electrodeposition processes under Since electrode reaction rate is controlled by diffusion, change may be caused double layer...