A5048502355- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Luminescence and Fluorescent Materials
- Organoboron and organosilicon chemistry
- Carbon dioxide utilization in catalysis
- Organic Light-Emitting Diodes Research
- Catalytic Cross-Coupling Reactions
- Molecular Junctions and Nanostructures
- Molecular Sensors and Ion Detection
- Asymmetric Hydrogenation and Catalysis
- Porphyrin and Phthalocyanine Chemistry
- Catalytic C–H Functionalization Methods
- Crystallography and molecular interactions
- Perovskite Materials and Applications
- Catalytic Alkyne Reactions
- CO2 Reduction Techniques and Catalysts
- Electrochemical Analysis and Applications
- Electrochemical sensors and biosensors
- Photochromic and Fluorescence Chemistry
- Photoreceptor and optogenetics research
- Conducting polymers and applications
- Polyoxometalates: Synthesis and Applications
- Advanced Polymer Synthesis and Characterization
- Electrocatalysts for Energy Conversion
- Synthesis and Properties of Aromatic Compounds
Osaka University
2017-2025
Graduate School USA
2015-2021
Osaka Hospital
2021
Toyon (United States)
2019-2020
Kyoto University
2012-2017
Tohoku University
2017
Chiba University
2005
National Institute of Technology, Oshima College
1987
Silalactones: The copper-catalyzed reaction of internal alkynes with (dimethylphenylsilyl)pinacolborane (Me2PhSi-B(pin)) as the silicon source and CO2 at atmospheric pressure afforded silalactones selectively in good to high yields. can be used substrates for Hiyama cross-coupling demonstrated one substrate. Detailed facts importance specialist readers are published "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted by...
A regiodivergent silacarboxylation of allenes under a CO2 atmosphere with PhMe2Si-B(pin) as silicon source in the presence copper catalyst at 70 °C has been developed. The regioselectivity reaction is successfully reversed by proper choice ligand; carboxylated vinylsilanes are obtained rac-Me-DuPhos ligand, whereas use PCy3 affords allylsilanes. Thus, two different silanes can be selectively and regiodivergently synthesized from single allene substrate.
Abstract The boraformylation of allenes with B 2 (pin) and a formate ester as boron formyl source, respectively, proceeds in the presence copper catalyst. reaction selectively affords corresponding β‐boryl β,γ‐unsaturated aldehydes good to high yields. Furthermore, silaformylation was achieved PhMe Si−B(pin) silicon source.
The nickel-catalyzed double carboxylation of internal alkynes employing carbon dioxide (CO2) has been developed. reactions proceed under CO2 (1 atm) at room temperature in the presence a nickel catalyst, Zn powder as reducing reagent, and MgBr2 an indispensable additive. Various could be converted to corresponding maleic anhydrides good high yields. DFT calculations disclosed role second insertion.
A highly selective carbon-carbon bond-forming transformation of carbon dioxide (CO2) to alcohol oxidation level has been disclosed. By employing a copper/bisphosphine catalyst system and hydrosilanes as mild easy-to-handle reducing agents, various allenes can be reacted with CO2 regioselectively obtain homoallylic alcohols. Esters other reducible functionalities on the remain intact during reaction, whereas is reduced level.
The phenomenon of crystal melting by light irradiation, known as photo-induced crystal-to-liquid transition (PCLT), can dramatically change material properties with high spatiotemporal resolution. However, the diversity compounds exhibiting PCLT is severely limited, which hampers further functionalisation PCLT-active materials and fundamental understandings PCLT. Here, we report on heteroaromatic 1,2-diketones new class compounds, whose based conformational isomerisation. In particular, one...
Fast room-temperature phosphorescence with high quantum yields up to 38% in solution from metal-free organic 1,2-diketones is reported, along the mechanism and molecular design principles governing fast phosphorescence.
An organic 1,2-diketone with intramolecular chalcogen bonding overcomes the room-temperature phosphorescence (RTP) quenching problem on amorphization, representing first RTP-to-RTP mechanochromism of a metal-free molecule.
Light-emitting molecules have been extensively studied due to their potential and wide variety of applications from optoelectronic devices biomedical applications. To fully understand rationalize the light-emitting process for innovation next-generation applications, it is vital reveal dynamic behavior excitons, where excited electronic states (locally excited, charge transfer, separated states), spin multiplicity, motion atomic nucleus are interacting each other. Here, we will show our...
Introducing heavy atoms, or replacing atoms with heavier ones, is a routine approach for accelerating spin-flipping photophysical processes. However, predicting its impact on phosphorescence efficiency not straightforward. Herein, we report an unexpected consequence of bromine-to-iodine substitution in bromothienyl diketone derivative, TIPS-BrTn, that exhibits outstanding room-temperature (RTP) cyclohexane solution. Contrary to our expectation, the iodo-congener TIPS-ITn exhibited feeble...
We report the synthesis and characterization of a π‐expanded neutral PAH radical, benzo[cd]perylenyl (1), derived from phenalenyl radical (2). Hückel molecular orbital (HMO) analysis reveals uniformly distributed SOMO that enables effective two‐electron 20‐center bonding in π‐dimer. ESR measurements 1 show long half‐life 63 days air‐saturated toluene at room temperature. Temperature‐dependent absorption spectra as well DFT calculations confirm preferential formation π‐dimer over σ‐dimer with...
Abstract The boraformylation of allenes with B 2 (pin) and a formate ester as boron formyl source, respectively, proceeds in the presence copper catalyst. reaction selectively affords corresponding β‐boryl β,γ‐unsaturated aldehydes good to high yields. Furthermore, silaformylation was achieved PhMe Si−B(pin) silicon source.
Silalactone: Die kupferkatalysierte Reaktion interner Alkine mit (Dimethylphenylsilyl)pinakolboran als Siliciumquelle und CO2 (1 atm) führt selektiv guten Ausbeuten zu Silalactonen. Diese können Substrate für die Hiyama-Kreuzkupplung eingesetzt werden, wie an einem Beispiel gezeigt wird.
The room-temperature phosphorescence (RTP) of metal-free organic crystals is normally quenched by mechanical stimulation. Herein, we demonstrate the opposite mechanoresponse turn-on RTP. A desymmetrization a C2-symmetric 1,2-diketone creates space for molecular motion in crystal, quenching RTP from crystal while maintaining that amorphous solid.
Metal-free, single-component, unsymmetrical 1,2-diketone exhibits liquefaction-induced room-temperature phosphorescence. Desymmetrisation provides the supercooled liquid with notable kinetic stability and phase-dependent phosphorescence properties.
Abstract The copper-catalyzed silylative allylation of ketones with allenes and silylboranes via an in situ generated β-silylallylcopper intermediate has been developed. Various were converted to the homoallylic tertiary alcohols bearing internal (E)-vinylsilane moieties regio- stereoselectively good high yields. Aldehydes also employed as electrophiles reaction.
Modulating the stimulus-responsiveness of a luminescent crystal is challenging owing to complex interdependent nature its controlling factors, such as molecular structure, conformation, packing, optical properties, and amorphization behavior. Herein, we demonstrate halogen-exchange approach that disentangles this problem, thereby realizing modulation room-temperature phosphorescence-to-phosphorescence mechanochromism. Replacing bromine atoms in brominated thienyl diketone with chlorine...
A rigid, polycyclic, and fully-ring-fused π-system without any rotatable substituents shows aggregation-induced emission or aggregation-caused quenching, depending on the fused aromatic rings.
The tetraarylporphyrin/POM complexes with CT character show negative differential resistance because of the memristor-like behavior.
The realization of molecular devices via metal–molecule–metal junctions necessitates the fabrication a steady bridging structure, where number structures should be fixed. This study investigated new method using migrations gold atoms on static nanogap electrodes. First, electrodes with large gap size were fabricated for molecules, and was controlled through applied bias voltage after coated molecules. Similar to mechanically break junction (MCBJ), thiol or dithiol molecules continuously...
A palladium-catalyzed double carbonylative cyclization of benzoins has been developed, which realizes the synthesis bis-ester-bridged stilbenes just in two steps from aldehydes. Thus, obtained fully fused tetracyclic π-systems have a pyrano[3,2-b]pyran-2,6-dione (PPD) core on their center, showing reversible reductions at low potentials. In addition, photoluminescence properties are strikingly affected by aromatic rings to PPD core; bis-thieno-fused PPDs found be excellent fluorophores with...
We investigated the electrochemical stability of a Pt/Pd(111) model core–shell structure for oxygen reduction reaction catalysts in 0.1 M HClO4 at 80°C by performing potential cycles (PCs) between 0.6 and x V vs. RHE (x = 0.8–1.0; xV-PCs). Pristine shows an ORR activity four times higher than that Pt(111), which considerably decreased after 5000 0.9- 1.0 V-PCs remained nearly unchanged 0.8- 0.85 samples. These results suggest atomic-scale structural changes Pt/Pd interface depend on PC...
Wataru Ishii opened discussion of the paper by Jenny Clark: What type defect is required to induce coherent singlet fission (SF)? I am curious about distance between and orientation rubrene molecules in dimer. Clark responded: It not yet clear what kind indu