A5075965154- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Magnetism in coordination complexes
- Lanthanide and Transition Metal Complexes
- Crystallography and molecular interactions
- Electron Spin Resonance Studies
- Physics of Superconductivity and Magnetism
- Catalysis for Biomass Conversion
- Subcritical and Supercritical Water Processes
- Organic and Molecular Conductors Research
- Porphyrin and Phthalocyanine Chemistry
- Metal-Catalyzed Oxygenation Mechanisms
- Photonic Crystals and Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Catalysts for Methane Reforming
- Metal complexes synthesis and properties
- Quantum and electron transport phenomena
- Catalysis and Hydrodesulfurization Studies
- Lignin and Wood Chemistry
- Zeolite Catalysis and Synthesis
- Magnetic properties of thin films
- Catalytic Processes in Materials Science
- Photonic and Optical Devices
- Liquid Crystal Research Advancements
- Photochromic and Fluorescence Chemistry
Kyushu University
2016-2025
Nankai University
2025
National Institute of Advanced Industrial Science and Technology
2015-2024
Osaka Prefecture University College of Technology
2013-2021
Sendai University
2014-2021
Nagoya University
2021
Kobe University
2021
Okayama University of Science
2021
Robert Bosch (Germany)
2020
Dalian University
2012
Photoinduced magnetization was observed in a Prussian blue analog, K0.2Co1.4- [Fe(CN)6]·6.9H2O. An increase the critical temperature from 16 to 19 kelvin as result of red light illumination. Moreover, ferrimagnetic region below substantially increased after illumination and could be restored almost its original level by thermal treatment. These effects are thought caused an internal photochemical redox reaction. Furthermore, used partly remove enhancement magnetization. Such control...
The magnetic properties of many materials can be controlled by external stimuli. principal focus here is on the thermal, photochemical, electrochemical, and chemical control phase transitions that involve changes in magnetization. molecular compounds described herein range from metal complexes, through pure organic to composite materials. Most Review devoted valence-tautomeric compounds, magnets, spin-crossover which could find future application memory devices or optical switches.
Molecular-based ferrimagnetic thin films with high critical temperatures ( T c ) composed of mixed-valence chromium cyanides were synthesized by means a simple electrochemical route. The highest was 270 K, obtained for Cr 2.12 (CN) 6 . values easily controlled changing the preparation conditions. Moreover, reversible shift could be electrochemically induced. As result such control, these can switched reversibly back and forth between ferrimagnetism paramagnetism. These magnets thus represent...
The electronic and spin states of a series Co-Fe Prussian blue analogues containing Na(+) ion in the lattice, Na(x)()Co(y)()Fe(CN)(6) x zH(2)O, strongly depended on atomic composition ratio Co to Fe (Co/Fe) temperature. Compounds Co/Fe = 1.5 1.15 consisted mostly Fe(III)(t(2g)(5)e(g)(0), LS, S 1/2)-CN-Co(II)(t(2g)(5)e(g)(2), HS, 3/2) site Fe(II)(t(2g)(6)e(g)(0), 0)-CN-Co(III)(t(2g)(6)e(g)(0), 0) site, respectively, over entire temperature region from 5 350 K. Conversely, compounds 1.37,...
A possible route to finding new optically switchable molecular solids is investigate the photoeffects of compounds that exhibit an abrupt phase transition or hysteresis loop. Such must possess at least bistable states are separated by a potential barrier in free energy. In fact, on basis this idea, we have recently succeeded identifying three kinds compounds. These include Fe(III) spin-crossover complex exhibiting light induced excited spin state trapping effects and Cu(II) photochromic FeCo...
Dry and bright: To mimic the wings of displayed Morpho butterfly, a new decorative material that exhibits both structural color superhydrophobicity (the “lotus effect”) was developed by taking advantage unique properties an inverse opal film, which fabricated self-assembly polystyrene spheres silica nanoparticles. The study biological microstructure is one most important research areas in biomimicry.1–3 Microstructure plays many roles living things.2, 3 For example, charming blue sulkowskyi...
We report here a self-cleaning particle coating with antireflection (AR) properties. The coatings were prepared by (1) depositing SiO2 single-layered on polyelectrolyte-modified glass substrates through electrostatic attraction, (2) subsequently another layer of TiO2 nanoparticles and (3) removing the polymer calcination at 500 °C. AR effect was studied transmission spectra collected normal incidence. properties change water contact angle octadodecyldimethylchlorosilane-modified under 1.0 mW...
The structural blue color of a Morpho butterfly originates from the diffraction light and interference effects due to presence microstructures on wing butterfly. Structural surface damselfish reversibly changes between green blue. Inspired by these creatures, we have been trying prepare high-quality functional films. We describe our efforts in this Account. A useful technique such films colloidal solution is "lifting" method, which allows us quickly fabricate brilliant crystal thicknesses...
Abstract Polarization change induced by directional electron transfer attracts considerable attention owing to its fast switching rate and potential light control. Here, we investigate electronic pyroelectricity in the crystal of a mononuclear complex, [Co(phendiox)( rac -cth)](ClO 4 )·0.5EtOH ( 1 ·0.5EtOH, H 2 phendiox = 9, 10-dihydroxyphenanthrene, -cth racemic 5, 7, 12, 14-hexamethyl-1, 4, 8, 11-tetraazacyclotetradecane), which undergoes two-step valence tautomerism (VT). Correspondingly,...
Abstract Mechanically interlocked molecules (MIMs) including famous catenanes show switchable physical properties and attract continuous research interest due to their potential application in molecular devices. The advantages of using spin crossover (SCO) materials here are enormous, allowing for control through diverse stimuli highly specific functions, enabling the transfer internal dynamics MIMs from solution solid state, leading macroscopic applications. Herein, we report efficient...
Spin-crossover (SCO) materials exhibit remarkable potential as bistable switches in molecular devices. However, the spin transition temperatures (Tc) of known compounds are unable to cover entire ambient temperature spectrum, largely limiting their practical utility. This study reports an exemplary two-dimensional SCO solid solution system, [FeIII(H0.5LCl)2–2x(H0.5LF)2x]·H2O (H0.5LX = 5-X-2-hydroxybenzylidene-hydrazinecarbothioamide, X F or Cl, x 0 1), which adjacent layers adhered via...
Open AccessCCS ChemistryRESEARCH ARTICLES8 Jan 2025Polarization Change via Spin Crossover and Valence Tautomerism Behavior in [FeGa] Complexes Qirui Shui, Shu-Qi Wu, Wenwei Zheng, Xiaopeng Zhang, Ziqi Zhou, Masaki Kondo, Masashi Tokunaga, Rintaro Shimada, Akira Sakamoto, Shinji Kanegawa, Sheng-Qun Su Osamu Sato Shui , Wu Zheng Zhang Zhou Kondo Tokunaga Shimada Sakamoto Kanegawa https://doi.org/10.31635/ccschem.025.202405245 SectionsSupplemental MaterialAboutPDF ToolsAdd to favoritesDownload...
A dipping method was developed to fabricate three-dimensional colloidal crystal films. The thickness of the films fabricated by this can be precisely controlled from one layer several tens layers controlling particle concentration and film formation speed. Experimental results showed that spheres form a face-centered cubic structure single crystals in extend centimeter dimensions.
Two kinds of cobalt-iron cyanides (Rb(0.66)Co(1.25)[Fe(CN)(6)].4.3H(2)O and Co(1.5)[Fe(CN)(6)].6H(2)O) with different electronic structures have been investigated to understand the photoinduced long-range magnetic ordering. Rb(0.66)Co(1.25)[Fe(CN)(6)].4.3H(2)O produces a photomagnetic effect, whereas Co(1.5)[Fe(CN)(6)].6H(2)O does not respond light. FT-IR Mössbauer studies revealed that their oxidation states are expressed as Rb(0.66)Co(III)(0.84)Co(II)(0.41)[Fe(II)(CN)(6)]...
A highly efficient solid-state solar cell (TiO2/dye/CuI) with improved stability was fabricated by controlling the pore filling of porous dyed TiO2 layer molten salt capped CuI crystals and improving necking ZnO. The controls crystal growth acts as a protective coating for nanocrystals, more conductive ZnO improves electrical contact between particles, both contributing to performance. Cells achieved efficiency high 3.8% under continuous illumination about 2 weeks.
The magnetic properties of the spin-crossover compounds, [Fe(qsal)2]NCSe·MeOH (1) and [Fe(qsal)2]NCSe·CH2Cl2 (2), have been measured. We discovered that both compounds 1 2 exhibit a wide thermal hysteresis loop 140 K (T1/2↑ = 352 T1/2↓ 212 K) 180 392 K), respectively, in first cycle. Thermogravimetric analysis shows solvent molecules escape from around 340 395 K, respectively. This means loops observed for cycle are only apparent ones. Following loop, they show two-step warming mode....
Abstract Man kennt eine Vielzahl magnetischer Materialien, deren magnetische Eigenschaften durch externe Stimuli geschaltet werden können. Das Hauptaugenmerk liegt auf der thermischen, photochemischen, elektrochemischen und chemischen Steuerung von Phasenübergängen, die mit einem Wechsel Magnetisierung einhergehen. Die Bandbreite beschriebenen Spezies reicht Metallkomplexen über rein organische Verbindungen bis zu Kompositmaterialien, wobei Schwerpunkt dieses Aufsatzes den valenztautomeren...
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTADDITION / CORRECTIONThis article has been corrected. View the notice.First Observation of Light-Induced Excited Spin State Trapping for an Iron(III) ComplexShinya Hayami, Zhong-ze Gu, Motoo Shiro, Yasuaki Einaga, Akira Fujishima, and Osamu SatoView Author Information Special Research Laboratory Optical Science Kanagawa Academy Technology KSP Building East 412, 3-2-1 Sakado Takatsu-ku, Kawasaki-shi, 213-0012, Japan X-ray Laboratory, Rigaku...
We tried to design the magnet exhibiting magnetic pole (N and S) inversion by photostimuli. The magnetization of Fe1.5IICrIII(CN)6⋅7.5H2O was changed in a photon mode visible light. A ferro-ferrimagnet (Fe0.40IIMn0.60II)1.5CrIII(CN)6⋅7.5H2O mixed ferromagnetic (Fe–Cr system showing change optical stimuli) site ferrimagnetic (Mn–Cr no response) showed negative at temperature lower than compensation (Tcomp=19 K). In this metal cyanide we have succeeded demonstrating novel behavior...
A dinuclear complex, [(CoTPA)2(DHBQ)](PF6)3, has been successfully synthesized that exhibits a valence tautomeric transition with distinct hysteresis effect (13 K) around room temperature and photoinduced tautomerism under low temperature.
Composite materials comprised of nematic liquid crystals (LCs) and SiO(2) inverse opal films were fabricated. Their optical properties quite different from those without the LCs. The could be controlled by changing refractive indices LCs, which vary with orientation, phase, temperature. In particular, drastically changed thermal or photoinduced isothermal phase transitions This means that photonic band structure controlled, tunable have been achieved, based on structure. mechanism this...
Single-chain magnets (SCMs) that exhibit slow relaxation of their magnetization are attracting considerable attention. To tune the properties such materials with external stimuli as light, heat, and pressure is a challenge. Through exploitation light heat induced transformation between diamagnetic Fe(II)(LS)(mu-CN)Co(III)(LS) (LS = low spin) units paramagnetic Fe(III)(LS)(mu-CN)Co(II)(HS) (HS high units, we show photoswitched from state to an antiferromagnetic ordered SCM thermally reverse...
How low can you go? An Fe(II) (4) square was prepared by self-assembly and exhibits both thermally induced photoinduced spin crossover from a system with four high-spin (HS) centers to one two low-spin (LS) centers. The spin-crossover sites are located on the same side of square, transition magnetic interactions (see picture) synergistically coupled.