A5047599576- Porphyrin and Phthalocyanine Chemistry
- Physics of Superconductivity and Magnetism
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Supramolecular Chemistry and Complexes
- Metal-Catalyzed Oxygenation Mechanisms
- Molecular Sensors and Ion Detection
- Magnetism in coordination complexes
- Magnetic properties of thin films
- Advanced biosensing and bioanalysis techniques
- Chemical Synthesis and Analysis
- Quantum and electron transport phenomena
- Luminescence and Fluorescent Materials
- Molecular Junctions and Nanostructures
- Metal-Organic Frameworks: Synthesis and Applications
- Surface Chemistry and Catalysis
- Metal complexes synthesis and properties
- Advanced Polymer Synthesis and Characterization
- Plant tissue culture and regeneration
- Heme Oxygenase-1 and Carbon Monoxide
- Crystallography and molecular interactions
- Photosynthetic Processes and Mechanisms
- biodegradable polymer synthesis and properties
- Covalent Organic Framework Applications
- DNA and Nucleic Acid Chemistry
Nagoya University
2015-2024
Japan Science and Technology Agency
2012-2023
National Institute of Technology, Oyama College
2008-2020
Nagaoka University of Technology
2018
Nagaoka University
2016
Tohoku University
1988-2015
Sekisui Chemical (Japan)
2011-2014
Tokyo Institute of Technology
2013
Tokyo University of Science
1987-2009
Shizuoka University
1965-2008
Microstructural properties and their influence on Jc have been studied in detail Ag-sheathed (Bi,Pb)2Sr2Ca2Cu3Ox tapes prepared by the powder-in-tube method. The present study centres two important factors for achievement of high values: (1) liquid phase reaction during (2223) formation at 847 degrees C composition Bi1.72Pb0.34Sr1.83Ca1.97Cu3.13Ox leads to better connectivity between platelets, thus considerably improving (77 K, 0 T): single packing powders formed no heat treatment therefore...
We have recently reported the first artificial nucleoside for alternative DNA base pairing through metal complexation (J. Org. Chem. 1999, 64, 5002-5003). In this context, we accomplished a Ag(I)-mediated pair or triplet in double- triple-stranded DNA, respectively, by introducing of pyridine nucleobases middle sequence. As result, incorporated Ag(I) complex significantly stabilized duplex and triplex. This strategy would be expanded to regulation thermodynamic stability triplex adding...
Tropinone is an alkamine intermediate at the branch point of biosynthetic pathways leading to various tropane alkaloids. Two stereospecifically distinct NADPH-dependent oxidoreductases, TR-I and TR-II, which, respectively, reduce tropinone 3alpha-hydroxytropane (tropine) 3beta-hydroxytropane (psi-tropine), were detected mainly in root alkaloid-producing plants but not nonproducing cultured root. Both reductases purified near homogeneity from Hyoscyamus niger characterized. The reaction was...
A new fluorescent probe for Zn2+, namely, 8-hydroxy-5-N,N-dimethylaminosulfonylquinolin-2-ylmethyl-pendant cyclen (L8), was designed and synthesized (cyclen=1,4,7,10-tetraazacyclododecane). By potentiometric pH, 1H NMR, UV spectroscopic titrations, the deprotonation constants pKa1-pKa6 of L(8)4 HCl were determined to be <2, <2 (for amino groups quinoline moieties), 7.19+/-0.05 8-OH moiety), 10.10+/-0.05, 11.49+/-0.05, respectively, at 25 degrees C with I=0.1 (NaNO3). The results as well...
Bi(2223)/Ag monofilamentary tapes have been characterized by measurements of jc vs. B and theta , the angle between applied magnetic field c axis. High degree texturing, high density Bi(2223) single phase conditions were found to be major effects leading values. A further condition for reaching highest values is a very low overall carbon content, presence at grain boundaries acting as strong limiting factor. The value in present work 4.104 A/cm2 77K,0T, corresponding more than 2.105 4.2K,0T.
We report the preparation and crystal structure of a triply stacked metal complex array in which Cu-phthalocyanine is sandwiched between different Cu-porphyrins. The discrete heterogeneous assembly was prepared through formation fourfold rotaxane from tetradactyl porphyrin with alkylammonium moieties phthalocyanine bearing four crown ethers subsequent an ionic tetraanionic porphyrin. porphyrin, Cu-TPPS(4-), selectively bound to cooperative π-π interactions. revealed columnar three planar...
A μ-oxo-dinuclear iron complex of a supramolecular porphyrin-phthalocyanine conjugate was synthesized and its catalytic electrochemical oxygen reduction properties were investigated. In the conjugate, porphyrin phthalocyanine units connected to form cofacial dimeric structure through flexible fourfold rotaxane linkage, which advantageous for accommodating small substrates between centers. The showed efficient properties, at more positive potentials than those other reported dinuclear...
Abstract Cyclometalated iridium (Ir) complexes having Ir(tpy) 3 (tpy=2‐(4’‐tolyl)pyridine) scaffold exhibit promising potential for the diagnosis of cancer, as phosphorescent probes cellular imaging and in treatment due to their high stability, tunable photophysical properties, biological activities. We previously reported on synthesis some cationic amphiphilic Ir(III) complex‐peptide hybrids (IPHs) such 2 that contain KK(K)GG peptide units (K: lysine, G: glycine) are attached via alkyl...
8-Benzenesulfonyloxy-5-N,N-dimethylaminosulfonylquinolin-2-ylmethyl-pendant cyclen (BS-caged-L4, BS = benzenesulfonyl) was designed and synthesized as a "caged" derivative of previously described Zn2+ fluorophore, 8-hydroxy-5-N,N-dimethylaminosulfonylquinolin-2-ylmethyl-pendant (L4) (cyclen 1,4,7,10-tetraazacyclododecane). In the absence metal ions in dark, BS-caged-L4 (10 µM) showed negligible fluorescence emission at pH 7.4 mM HEPES with I 0.1 (NaNO3)) 25 °C (excitation 328 nm). Addition...
Aldolases are enzymes that catalyze stereospecific aldol reactions in a reversible manner. Naturally occurring aldolases include class I aldolases, which via enamine intermediates, and II Zn(2+) enolates of substrates react with acceptor aldehydes. In this work, complexes L-prolyl-pendant[15]aneN(5) (ZnL(3)), L-prolyl-pendant[12]aneN(4) (ZnL(4)), L-valyl-pendant[12]aneN(4) (ZnL(5)) were designed synthesized for use as chiral catalysts enantioselective reactions. The complexation constants...
We previously reported on a 8-quinolinol-pendant cyclen (L5) as Zn2+ fluorophore (cyclen = 1,4,7,10-tetraazacyclododecane) and its caged derivative, 8-(benzenesulfonyloxy)-5-(N,N-dimethylaminosulfonyl)quinolin-2-ylmethyl-pendant (BS-caged-L5), which can be reactivated by hydrolysis of benzenesulfonyl group upon complexation with at neutral pH to give 1:1 Zn2+−L5 complex (Zn(H−1L5)). report herein the synthesis 5,7-bis(N,N-dimethylaminosulfonyl)-8-hydroxyquinolin-2-ylmethyl-pendant (L6)...
Back and forth. Redox potential sensors that consist of a flavin unit, bora-3a,4a-diaza-s-indacene (BODIPY) moiety, L-proline linker are presented. While reduced forms these fluorescent almost nonfluorescent, their oxidized exhibit bright emissions under control the redox status unit. It is also shown changes reversible in aqueous solutions living cells, as illustrated figure. Supporting information for this article available on WWW http://www.wiley-vch.de/contents/jc_2268/2008/z700718_s.pdf...
Abstract Development of supramolecular methods to further activate a highly reactive intermediate is fascinating strategy create novel potent catalysts for activation inert chemicals. Herein, approach enhance the oxidizing ability high‐valent oxo species nitrido‐bridged iron porphyrinoid dimer that known molecular catalyst light alkane oxidation reported. For this purpose, dinuclear complex porphyrin‐phthalocyanine heterodimer 3 5+ , which connected through fourfold rotaxane, was prepared....
μ-Nitrido- and μ-carbido-bridged iron phthalocyanine dimers, when used as cathode-active materials for rechargeable lithium batteries, showed four stable redox waves in cyclic voltammetry studies solution a discharge capacity of approximately 60 mAh g–1 after 200 cycles. These results indicate that μ-heteroatom-bridged dimers are good platforms designing novel phthalocyanine-based electrode-active materials.
Catalytic methane and ethane oxidation activities by μ-nitrido-bridged iron porphyrinoid dimers containing one or two porphyrins in aqueous solutions excess H 2 O were compared with those a phthalocyanine dimer.
Metal-ligand delocalization of metal porphyrin complexes in aqueous solutions was investigated by analyzing the electronic structure both and ligand sides using soft X-ray absorption spectroscopy (XAS) at L
A stacked assembly composed of a porphyrin and two phthalocyanines was prepared through fourfold rotaxane formation. Two phthalocyanine molecules, bearing four 24-crown-8 units, were assembled onto template incorporating sidechains with dialkylammonium ions each pseudorotaxane formation between crown ether units ammonium ions. The Staudinger phosphite reaction, as the stoppering resulted in heterotrimer connected structure. UV/Vis spectroscopic electrochemical studies indicated that there is...
We report on the design and synthesis of triptycene–peptide hybrids (TPHs), 5, syn-6, anti-6, which are conjugates a triptycene core unit with two or three cationic KKKGG peptides (K: lysine G: glycine) through C8 alkyl chain. It was discovered that syn-6 anti-6 induce paraptosis, type programmed cell death (PCD), in Jurkat cells (leukemia T-lymphocytes). Mechanistic studies indicate these TPHs transfer Ca2+ from endoplasmic reticulum (ER) to mitochondria, loss mitochondrial membrane...
Numerous biomimetic molecular catalysts inspired by methane monooxygenases (MMOs) that utilize iron or copper-oxo species as key intermediates have been developed. However, the catalytic oxidation activities of molecule-based are still much lower than those MMOs. Herein, we report close stacking a μ-nitrido-bridged phthalocyanine dimer onto graphite surface is effective in achieving high activity. The activity almost 50 times higher other potent and comparable to certain MMOs, an aqueous...
To generate integrated organized molecular properties, multiple components are required to be assembled into the system with sequential and spatial accuracy in accordance design of assembly. Herein, we present a novel programmable synthesis cofacially stacked porphyrin array via repetitive construction peptide duplex. We designed synthesized having two artificial amino acid moieties at trans meso-positions. The can connected another unit by doubly coupling reactions afford duplex bridged...