A5025237521- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Diamond and Carbon-based Materials Research
- Photochemistry and Electron Transfer Studies
- Metal and Thin Film Mechanics
- Crystallography and molecular interactions
- Photochromic and Fluorescence Chemistry
- Boron and Carbon Nanomaterials Research
- Luminescence and Fluorescent Materials
- Dyeing and Modifying Textile Fibers
- Porphyrin and Phthalocyanine Chemistry
- Spectroscopy and Quantum Chemical Studies
- Urban and spatial planning
- Molecular Sensors and Ion Detection
- Topology Optimization in Engineering
- Semiconductor materials and devices
- Structural Analysis and Optimization
- Organic Electronics and Photovoltaics
- Structural Engineering and Vibration Analysis
- Structural Behavior of Reinforced Concrete
- Synthesis of Organic Compounds
- Synthesis and Characterization of Heterocyclic Compounds
- Analytical Chemistry and Sensors
- Conducting polymers and applications
- Liquid Crystal Research Advancements
Yokohama National University
2015-2025
Kagoshima University Hospital
2024
Kindai University
2010-2023
Hiroshima University
2000-2023
Kyushu University
1993-2020
RIKEN Advanced Science Institute
2014-2018
Hodogaya Chemical (Japan)
2018
Universitas 17 Agustus 1945 Semarang
2018
National Institute for Materials Science
2001-2017
Southwest Bahia State University
2010-2017
Co-oligomers involving (1H)-4-pyridone and 4-alkoxypyridine rings were studied, it was found that their supramolecular transformation caused by saccharide recognition. In the co-oligomers, pyridone pyridine are alternately linked at 2,6-position with an acetylene bond. The behave as a hydrogen bonding acceptor, tautomerized 4-pyridinol work donor. Pyridine-pyridone-pyridine 3-mer to self-dimerize on basis of vapor pressure osmometry in CHCl(3), association constant obtained 2.3 x 10(3) M(-1)...
A series of compounds with both urea and urethane moieties have been developed as color developers for high-performance thermo-sensitive paper. The lower environmental loads than conventional phenolic developers. They were also found to greatly improve the speed printed images. In this study, we studied coloring mechanism when used a fluoran dye, investigated stability colored solid state. urea–urethane form black amorphous solids dye. Infrared (IR) measurements solids, based on six...
Magnesium phthalocyanine (MgPc) is a blue pigment whose X-phase known to exhibit an intense near-IR-absorption. Because of this, MgPc has attracted attention as material useful for laser printers well optical disks based on GaAsAl diodes. The near-IR absorption has, therefore, been investigated from the standpoints exciton coupling effects basis crystal structure. Two kinds six-coordinate complexes were grown solution and their structures analyzed: MgPc/(H2O)2·(N-methyl-2-pyrrolidone)2...
With a spatial correlation model, simple method was established to evaluate the crystallinity and stress of cubic boron nitride (cBN) films from variation linewidth peak shift Raman spectra. An increase decrease cBN with growth time were demonstrated. As reference, spectra single crystals synthesized by high-pressure, high-temperature also investigated. Our film deposited for 1 h revealed low about GPa comparable that 4--8 \ensuremath{\mu}m commercially available crystals.
Macrocyclic compounds consisting of three 2,6-pyridylene and 3,5-pyridylene units linked by acetylene bonds were synthesized a Sonogashira reaction. The X-ray structures showed π-stacked pairs two macrocycles, in which unit the one molecule overlaps other because dipole-dipole interaction. Atomic force microscope (AFM) measurements revealed fibril indicating stacking rigid planar macrocycles. Hydrogen-bonding ability macrocyclic inside was demonstrated addition octyl β-D-glucopyranoside.
A simple and versatile solution-processing method based on molecular self-assembly is used to fabricate organic single crystal microwires of a low bandgap quinoidal oligothiophene derivative. Individual microwire transistors present well-balanced ambipolar behaviour with hole electron mobilities as high 0.4 0.5 cm2 V−1 s−1, respectively.
Two polymorphs of a diketopyrrolopyrrole dye, one yellow and the other orange, were obtained.
The elastic and mechanical properties of high-quality cubic boron nitride (cBN) films with a few microns thickness submicron grain size grown on silicon substrates by chemical vapor deposition were determined measuring the dispersion surface acoustic waves propagating along layered system. values are compared those obtained an ultralow load indenter (Triboscope). Specifically, hardness, Young’s modulus density film measured.
Indenyl-functionalised BEt3-adduct NHCs were prepared by the reaction of imidazolium pro-ligands with LiBEt3H. This compound was converted into indenyl-coordinate molybdenum complex dangling NHC·BEt3 moiety as a substituent. The stepwise coordination NHC afforded chelate-type mononuclear well bimetallic complex.
As pointed out in titanylphthalocyanine, molecular distortion (reduction symmetry) upon crystallization exerts a significant influence on the optical absorption near-IR region. The electronic spectra of β metal-free phthalocyanine (MfPc) has been investigated from standpoint and exciton coupling effects. Close examination crystal structure MfPc revealed that symmetry is reduced D2h to Ci going solution solid state. Molecular found enhance band splitting such way longer-wavelength more...
Novel unsymmetrical squarylium dyes which absorb in the near-infrared region were synthesized by a stepwise procedure via intermediate 4-substituted 3-hydroxycyclobut-3-ene-1,2-diones. By introducing benz[c,d]indoline or benzo[b]pyran moieties at one end as an electron-donating component, SQ exhibited their absorption maxima 739–821 nm with large molar coefficients (log ε = 4.96–5.18) CHCl3. The X-ray analysis for of these was also examined to confirm overall structure dye.
Encapsulation of highly emissive alkynylpyrenes with permethylated α-cyclodextrin (PM-α-CD) followed by capping reaction yielded alkynylpyrene-based [3]rotaxanes. The [3]rotaxane emitted only blue light monomeric pyrene under various circumstances such as lipophilic, hydrophilic, and even condensed states exhibited extremely high stability for UV irradiation. These properties would result because PM-α-CD, like bulletproof glass, protected the alkynylpyrene core from attack another excited...