A5064729271- Magnetism in coordination complexes
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Lanthanide and Transition Metal Complexes
- Porphyrin and Phthalocyanine Chemistry
- Molecular Junctions and Nanostructures
- Organic and Molecular Conductors Research
- Quantum and electron transport phenomena
- Electron Spin Resonance Studies
- Crystallography and molecular interactions
- Physics of Superconductivity and Magnetism
- Rare-earth and actinide compounds
- Advanced NMR Techniques and Applications
- Surface Chemistry and Catalysis
- Magnetic properties of thin films
- Metal-Catalyzed Oxygenation Mechanisms
- Magnetic Properties of Alloys
- Iron-based superconductors research
- Graphene research and applications
- X-ray Spectroscopy and Fluorescence Analysis
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Inorganic Chemistry and Materials
- Nuclear Physics and Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Metal complexes synthesis and properties
Josai University
2021-2024
Japanese Red Cross Medical Center
2009-2023
Tohoku University
2013-2022
Graduate School USA
2016-2021
Multidisciplinary Digital Publishing Institute (Switzerland)
2020
The Nakamura Hajime Eastern Institute
2020
Hokkaido University
2006-2020
Kyoto University
2007-2020
Jagiellonian University
2020
Sendai University
2016-2020
In molecular spintronics, the spin state of a molecule may be switched on and off by changing structure. Here, we switch double-decker bis(phthalocyaninato)terbium(III) complex (TbPc2) adsorbed an Au(111) surface applying electric current via scanning tunnelling microscope. The dI/dV curve recorded onto TbPc2 shows Kondo peak, origin which is unpaired π-orbital phthalocyaninato (Pc) ligand. By controlled pulses, could rotate upper Pc ligand in TbPc2, leading to disappearance reappearance...
The crystal structures of double-decker single molecule magnets (SMM) LnPc2 (Ln = Tb(III) and Dy(III); Pc phthalocyanine) non-SMM YPc2 were determined by using X-ray diffraction analysis. compounds are isomorphous to each other. have metal centers (M Tb3+, Dy3+, Y3+) sandwiched two ligands via eight isoindole-nitrogen atoms in a square-antiprism fashion. twist angle between the is 41.4°. Scanning tunneling microscopy was used investigate adsorbed on Au(111) surface, deposited thermal...
A single magnet in a triple decker! TbIII–phthalocyaninate triple-decker 1, which has center of symmetry, showed two magnetic relaxation processes the low-temperature region presence direct current (dc) field. These results suggest that single-molecule magnet/magnetic properties 1 undergo significant transition dc Detailed facts importance to specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available...
Herein we report the synthesis and characterization of a dinuclear TbIII single-molecule magnet (SMM) with two [TbPc2]0 units connected via fused-phthalocyaninato ligand. The stable robust complex [(obPc)Tb(Fused-Pc)Tb(obPc)] (1) was characterized by using synchrotron radiation measurements other spectroscopic techniques (ESI-MS, FT-IR, UV). magnetic couplings between ions π radicals present in 1 were explored means density functional theory (DFT). Direct alternating current susceptibility...
Magnetic dipole interactions are dominate in quasi one-dimensional (1D) molecular magnetic materials, which TbNcPc units (Tb3+ =terbium(III) ion, Nc2- =naphthalocyaninato, Pc2- =phthalocyaninato) adopt a structure similar to TbPc2 single-molecule magnets (SMMs). The properties of the [TbNcPc]0/+ (neutral 1 and cationic 2) with 1D structures significantly different from those magnetically diluted sample (3). In particular, relaxation time (τ) 2 low-temperature region is five orders magnitude...
Diagnosis of perioperative anaphylaxis is often challenging. This study describes the utility a newly developed tool for identifying patients with high possibility anaphylaxis, and aimed to investigate frequency each drug during period in Japan.This included Grade 2 or higher severity general anaesthesia at 42 facilities across Japan 2019 2020. We adopted unique objective evaluation yielding composite score diagnosing which includes results skin tests basophil activation tests, clinical...
The SMM behaviour of dinuclear Ln(III)–Pc multiple-decker complexes (Ln = Tb3+ and Dy3+) with energy barriers slow-relaxation were explained by using X-ray crystallography static dynamic susceptibility measurements. In particular, interactions among the 4f electrons several type SMMs have never been discussed on basis crystal structure. For Tb(III)–Pc complexes, a dual magnetic relaxation process was observed. processes are due to anisotropic centres. Our results clearly show that two ion...
Abstract Lanthanide‐based extended coordination frameworks showing photocontrolled single‐molecule magnet (SMM) behavior were prepared by combining highly anisotropic Dy III and Ho ions with the carboxylato‐functionalized photochromic molecule 1,2‐bis(5‐carboxyl‐2‐methyl‐3‐thienyl)perfluorocyclopentene (H 2 dae), which acts as a bridging ligand. As result, two new compounds of general formula [{Ln (dae) 3 (DMSO) (MeOH)} ⋅ 10 M eOH] n (M=Dy for 1 ) additional pseudo‐polymorphs [{Dy O)} x...
Unlike electronics, which is based on the freedom of charge an electron whose memory volatile, spintronics charge, spin, and orbital non-volatile. Although in most GMR, TMR, CMR systems, bulk or classical magnets that are composed transition metals used, this Focus Review considers growing use single-molecule (SMMs) multinuclear metal complexes nanosized magnets, exhibit slow magnetic-relaxation processes quantum tunneling. Molecular spintronics, combines molecular emerging field research....
DySc2N@C80 is an endohedral metallofullerene showing single-molecule magnet (SMM) behavior. In this work, we encapsulated DySc2N@C80-SMMs into the internal one-dimensional nanospace of single-walled carbon nanotubes (SWCNTs). Using transmission electron microscopy, "peapod" structures were clearly observed. From magnetic field dependent measurements, showed stepwise hysteresis characteristic SMMs even inside SWCNTs, and coercivity increased from 0.5 to 4 kOe. addition, it slow relaxation...
Single-molecule magnet (SMM) properties of terbium(iii)-phthalocyaninato and porphyrinato mixed ligand triple-decker complexes, [(TTP)Tb(Pc)Tb(TTP)] (1) [(Pc)Tb(Pc)Tb(TTP)] type (2), were studied compared with those the TbIII homoleptic complex [(obPc)Tb(obPc)Tb(obPc)] (3) in order to elucidate relationship between octa-coordination environments SMM (TbIII = terbium(iii), TTP2- tetraphenylporphyrinato, Pc2- phthalocyaninato, obPc2- 2,3,9,10,16,17,23,24-octabutoxyphthalocyaninato). By...
The single-molecule magnet (SMM) behaviour of dinuclear Ln(III)-Pc triple-decker complexes (Dy(III)-Y(III): 1 and Dy(III)-Dy(III): 2) with the same octacoordination environment slow magnetic relaxation were explained using X-ray crystallography static dynamic susceptibility measurements. In particular, interactions among 4f electrons Dy(III)-Pc type SMMs have never been discussed on basis environment. Our results clearly show that Dy(III) ion sites 2 are equivalent, consistent crystal...
We investigated spin states of stable neutral pure-organic radical molecules 1,3,5-triphenyl-6-oxoverdazyl (TOV) and 1,3,5-triphenyl-6-thioxoverdazly (TTV) adsorbed on an Au(111) surface, which appears as a Kondo resonance because spin-electron interaction. By using scanning tunneling spectroscopy (STS), clear was detected for the TOV molecule. However, no with protrusions in occupied state image TTV molecules. Spin-resolved DFT calculations showed that unpaired π electron delocalized over...
Several small paramagnetic complexes combine large hyperfine NMR shifts with magnetic anisotropies. The latter are a prerequisite for single molecule magnet (SMM) behavior. We choose the SMM tris(octabutoxyphthalocyaninato) diterbium (1) high resolution study where we combined first time comprehensive (1)H and (13)C chemical shift analysis of evaluation residual dipolar couplings (RDCs). consequence partial alignment 1 in strong field spectrometer. To best our knowledge RDCs SMMs have never...
Single-molecule magnet (SMM) properties of terbium(III)–phthalocyaninato quintuple-decker complex TbCdCdTb were studied and compared with those other multiple-decker complexes (triple-decker: TbTb, quadruple-decker: TbCdTb) to elucidate the relationship between magnetic dipole interactions SMM properties. From X-ray crystallography performed synchrotron radiation, TbIII–TbIII distance in was determined be 9.883 Å. alternating current studies on TbCdCdTb, activation energy for spin reversal...
The understanding of the SMM–surface interactions, as well surfaces where SMM are deposited, is utmost importance for realisation novel spintronic devices.
Abstract A one‐dimensional (1D) arrangement of an unsubstituted partially oxidized Dy 3+ double‐decker complex, [DyPc 2 ]I x (Pc=phthalocyaninato, I=iodide; 1.93<x<2.26) ( 1 ), was obtained by using electro‐oxidation and chemical oxidation. In , the Pc ligands were oxidized, I 3 − ion present as a counter ion. From results spectrophotometric analysis on π radicals delocalized in 1D column behaved conductor even at low‐temperatures. Since conductivity observed temperatures lower than...
The crystal structures of double-decker single-molecule magnets (SMMs) LnPc2 (Ln = Tb(III) and Dy(III); Pc phthalocyanine) non-SMM YPc2 were determined by using single X-ray diffraction analysis. compounds are isomorphous to each other. have metal-centers (M3+ Tb, Dy, Y) sandwiched two ligands via eight isoindole-nitrogen atoms in a square-antiprism fashion. twist angle between the is 41.4°. Scanning tunneling microscopy (STM) was used investigate adsorbed on Au(111) surface, deposited...
A single-chain magnet (SCM) of [Mn(TBPP)(TCNE)]·4m-PhCl(2) (1), where TBPP(2-) = meso-tetra(4-biphenyl)porphyrinate; TCNE(•-) tetracyanoethenide radical anion; m-PhCl(2) meta-dichlorobenzene, was prepared via suppression interchain interactions. 1 has a one-dimensional alternating Mn(III)(porphrin)-TCNE(•-)chain structure similar to those family complexes reported by Miller and co-workers. From comparison the static magnetic properties with other Mn(III)(porphyrin)-TCNE(•-) chains,...
Being able to control the spin of magnetic molecules at single-molecule level will make it possible develop new spin-based nanotechnologies. Gate-field effects and electron photon excitations have been used achieve switching in molecules. Here, we show that atomic doping can be change molecular spin. Furthermore, a scanning tunneling microscope was place or remove dopant on molecule, allowing us controlled way. Bis(phthalocyaninato)yttrium (YPc(2)) deposited an Au (111) surface keep their...
Using a fused phthalocyaninato ligand to control the spatial arrangement of TbIII moieties in single-molecule magnets (SMMs), we could dipole–dipole interactions molecules and prepared first tetranuclear SMM complex. [Tb(obPc)2]Tb(Fused-Pc)Tb[Tb(obPc)2] (abbreviated as [Tb4]; obPc = 2,3,9,10,16,17,23,24-octabutoxyphthalocyaninato, Fused-Pc bis{72,82,122,132,172,182-hexabutoxytribenzo[g,l,q]-5,10,15,20-tetraazaporphirino}[b,e]benzenato). In direct-current magnetic susceptibility measurements,...
By using scanning tunneling microscopy (STM), we studied the heteroleptic double-decker complex TbNPcPc (NPc = naphthalocyaninato and Pc phthalocyaninato), where two different planar ligands sandwich a Tb(III) ion an unpaired π electron causes Kondo resonance upon adsorption on Au(111) surface. is good conductance control mechanism originating from interactions between conduction electrons localized spin. Two types of geometries appear depending which side contacts substrate surface, call...