A5022905670- Electron Spin Resonance Studies
- Magnetism in coordination complexes
- Photosynthetic Processes and Mechanisms
- Organic and Molecular Conductors Research
- Spectroscopy and Quantum Chemical Studies
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Porphyrin and Phthalocyanine Chemistry
- Lanthanide and Transition Metal Complexes
- Advanced NMR Techniques and Applications
- Luminescence and Fluorescent Materials
- Radiation Effects and Dosimetry
- Radical Photochemical Reactions
- Photoreceptor and optogenetics research
- X-ray Spectroscopy and Fluorescence Analysis
- Perovskite Materials and Applications
- Photochemistry and Electron Transfer Studies
- Atmospheric chemistry and aerosols
- Geomagnetism and Paleomagnetism Studies
- Polyoxometalates: Synthesis and Applications
- Monoclonal and Polyclonal Antibodies Research
- Molecular Junctions and Nanostructures
- Luminescence Properties of Advanced Materials
- Metal-Catalyzed Oxygenation Mechanisms
- Ammonia Synthesis and Nitrogen Reduction
Institute for Molecular Science
2017-2025
Nagoya University
2011-2021
We synthesized a two-dimensional (2D) crystalline covalent organic framework (sp2c-COF) that was designed to be fully π-conjugated and constructed from all sp2 carbons by C=C condensation reactions of tetrakis(4-formylphenyl)pyrene 1,4-phenylenediacetonitrile. The linkages topologically connect pyrene knots at regular intervals into 2D lattice with π conjugations extended along both x y directions develop an eclipsed layer rather than the more conventionally obtained disordered structures....
The term "peptoids" was introduced decades ago to describe peptide analogues that exhibit better physicochemical and pharmacokinetic properties than peptides. Oligo(N-substituted glycine) (oligo-NSG) previously proposed as a peptoid due its high proteolytic resistance membrane permeability. However, oligo-NSG is conformationally flexible, ensuring defined shape in water difficult. This conformational flexibility severely limits the biological application of oligo-NSG. Here, we propose...
Abstract Meeting the Internet of Things (IoT) demand for flexible organic spintronics requires dynamically flexible, “soft” magnetic materials. These materials should be capable reordering their macroscopic assemblies in response to external stimuli. Unlike conventional rigid, “hard” crystalline paramagnets, that are typically composed open‐shell π‐ or d/π‐conjugated planar molecules and rely on intermolecular interactions ordered, assembled structures, soft paramagnets necessitate a...
The generation of spin polarization is key in quantum information science and dynamic nuclear polarization. Polarized electron spins with long spin–lattice relaxation times (T1) at room temperature are important for these applications but have been difficult to achieve. We report the realization spin-polarized radicals extremely T1 a metal–organic framework (MOF) which azaacene chromophores densely integrated. Persistent generated MOF by charge separation after photoexcitation. Spin triplet...
The location of the high-affinity Mn(2+) site in apo-photosystem (PS) II was investigated by pulsed EPR. electron-electron magnetic dipole interaction 1.7 MHz between YD(•) radical and ion observed using double resonance (PELDOR) technique, bound to one apo-PS absence presence Ca(2+). PELDOR signals were calculated previously determined spin distribution on its known position crystal structure, assuming that specific located oxygen evolving complex. results show is at denoted Mn4(A) native...
In photosystem II (PSII), one-electron oxidation of the most stable state Mn4CaO5 cluster (S1) leads to formation two distinct states, open-cubane S2 conformation [Mn1(III)Mn2(IV)Mn3(IV)Mn4(IV)] with low spin and closed-cubane [Mn1(IV)Mn2(IV)Mn3(IV)Mn4(III)] high spin. electron paramagnetic resonance (EPR) spectroscopy, exhibits a g = 2 multiline signal. However, its protonation remains unclear. Here, we investigated by calculating exchange couplings in presence PSII protein environment...
A series of metal-organic frameworks (MOFs) assembled with diazatetracene (DAT)-based linkers were synthesized and characterized. Despite different chromophore orientations spacings, photoinduced persistent radicals generated in all the MOFs, their spin-lattice relaxation time (
In Mikawa Bay and Ise Bay, many tidal flats, shallow areas, seaweed beds have been lost due to land reclamation, the pollution inflow from domestic industrial wastewater has increased, causing environmental deterioration such as red blue tides. To prevent their occurrence, hyporheic zone of brackish lake leading these bays was dredged covered with sand, sewerage systems were constructed around surrounding areas. Furthermore, water in this is regularly substituted new river but unregulated...
Radicals generated in a 5,12-diazatetracene (DAT)-based metal–organic framework exhibit long coherence time ( T 2 ), and this shows response to the introduction of several guest molecules.
Quantum sensing using molecular qubits is expected to provide excellent sensitivity due the proximity of sensor target analyte. However, many are used at cryogenic temperatures, and how make respond specific analytes remains unclear. Here, we propose a new material design in which coherence time changes response variety room temperature. We photoexcited triplet, can be initialized temperature, as introduce them metal–organic framework that flexibly change its pore structure guest adsorption....
The utilization of near-infrared light is an important objective for the high-efficiency solar energy. Here, we describe a new class light-induced electron transfer system using distorted phthalocyanine as photosensitizer. We revealed that appropriate modification affords absorbing dye with high photostability and long excitation lifetime, was successfully established dye. mechanistic investigation clarified works via dynamic quenching mechanism. generated long-lived anion radical species...
Quantum sensing using molecular qubits is expected to provide excellent sensitivity due the proximity of sensor target analyte. However, many are used at cryogenic temperatures, and how make respond specific analytes remains unclear. Here, we propose a new quantum design in which coherence time changes response variety room temperature. We photoexcited triplet, can be initialized temperature, as introduce them metal–organic framework that flexibly change its pore structure guest adsorption....
To understand the electronic states on boundary region between commensurate antiferromagnetic (II) phase and incommensurate spin-density-wave in generalized diagram for one-dimensional organic conductors, we performed resonance (AFMR) nuclear magnetic (NMR) measurements ${(\mathrm{TMTTF})}_{2}\mathrm{Br}$. The angular dependence of AFMR fields at 1.5 K is different from that 4.8 K, temperature two modes enhanced below 5 K. Furthermore, $^{2}\mathrm{D}$(Deuterium)-NMR were deuterated...
Abstract A newly prepared photoresponsive material, specifically a naphthalene diimide molecule containing alkylamino groups, was found to exhibit structural phase transition in the crystalline state. The dramatically altered molecular arrangement from orthogonal π ‐ stacking parallel stacking. photomechanical response of each crystal also changed before and after transition. While as‐prepared immediately responded light irradiation ( λ =370 nm), responsiveness became slower heat treatment....
The spin coherence phenomena of a system consisting mononuclear 3d transition metal
Abstract Solid‐state broad line 1 H‐NMR (nuclear magnetic resonance) and ESR (electron spin were performed for an oxo‐bridged dinuclear ruthenium [RuORu] 5+ (Ru 3.5+ ORu ) mixed‐valence complex. The spin‐lattice relaxation rate T −1 was significantly enhanced, to below 100 K with a peak at approximately 33 K. temperature frequency‐independent, indicating that this anomaly is possible phase transition. Below 40 K, abrupt decrease of spin‐spin time 2 provides evidence the appearance...