Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1063/5.0250413

Publishing type：Research paper (scientific journal)  

DOI： 10.1149/MA2024-01131063mtgabs

Open Access

Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

DOI： 10.1039/d4fd90008a

PubMed

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

DOI： 10.1039/d4fd90006e

PubMed

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

DOI： 10.1039/d4fd90007c

PubMed

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

Fast room-temperature phosphorescence with high quantum yields up to 38% in solution from metal-free organic 1,2-diketones is reported, along with the mechanism and molecular design principles governing the fast phosphorescence.

DOI： 10.1039/d4sc02841d

Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.60391/koukagaku.54.2_80

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.26434/chemrxiv-2023-h17m5

Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Society of Synthetic Organic Chemistry, Japan  

DOI： 10.5059/yukigoseikyokaishi.81.492

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

UV irradiation induced conformational isomerisations of a 1,2-diketone in the crystal, causing multistep luminescence changes and eventual macroscopic melting.

DOI： 10.1039/d3sc00838j

Open Access

Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese  

Authorship：Last author,　Corresponding author   Language：English   Publisher：American Chemical Society (ACS)  

Crystal melting by light irradiation, that is, the phenomenon of photoinduced crystal-melt transition (PCMT), can dramatically change material properties with high spatiotemporal resolution. However, both the process and mechanism of PCMT remain unknown owing to a lack of suitable probes and the poor diversity of compounds exhibiting PCMT. Here, we report the first instance of PCMT with luminescence evolution. We show that a heteroaromatic 1,2-diketone crystal exhibits ON-OFF-ON luminescence changes under continuous ultraviolet irradiation, which can be ascribed to the sequential PCMT processes of crystal loosening and conformational isomerization before macroscopic melting. Single-crystal X-ray structural analysis, thermal analysis, and theoretical calculations of three diketones revealed that weak intermolecular interactions and the presence of a disordered layer in the crystal are essential for PCMT. Our results provide fundamental insights into the melting process of molecular crystals and should aid the molecular design of PCMT-active materials that are based on emissive compounds, as opposed to the classical molecular designing based on nonemissive photochromic scaffolds such as azobenzenes.

DOI： 10.26434/chemrxiv-2022-xv8bk

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Frontiers Media {SA}  

Modulating the stimulus-responsiveness of a luminescent crystal is challenging owing to the complex interdependent nature of its controlling factors, such as molecular structure, molecular conformation, crystal packing, optical properties, and amorphization behavior. Herein, we demonstrate a halogen-exchange approach that disentangles this problem, thereby realizing the modulation of room-temperature phosphorescence-to-phosphorescence mechanochromism. Replacing the bromine atoms in a brominated thienyl diketone with chlorine atoms afforded isostructural crystals; i.e., molecules with different halogen atoms exhibited the same molecular conformation and crystal packing. Consequently, amorphization behavior toward mechanical stimulation was also the same, and the phosphorescence of amorphous states originated from the same conformer of each diketone. In contrast, the phosphorescence properties of each conformer were modulated differently, which is ascribable to heavy atom effects, resulting in the modulation of the mechanochromism. Thus, halogen exchange is a promising approach for modulating the stimulus-responsive photofunctions of crystals involving spin-forbidden processes.

DOI： 10.3389/fchem.2021.812593

Open Access

Publishing type：Research paper (scientific journal)   Publisher：Universitas Gadjah Mada  

This paper reports the synthesis of Fe(II)/Co(II) fused triphenyl porphyrin dimers as candidate of hybrid organic metal electrocatalyst. The synthesis was conducted in five-step reactions using the starting materials pyrrole and benzaldehyde. The fuse oxidative reaction was done via free-base form of triphenyl porphyrin to omit metal insertions/removals of intermediate products. This strategy is very beneficial for the synthesis of metal fused triphenyl porphyrin that needs less reactions where phenyliodine(III) bis(trifluoroacetate) (PIFA) was successfully deployed in the oxidative reaction of two free-base triphenyl porphyrins. Here, the comparisons of NMR spectra were presented to see the changes of the starting material to the product. Initial electrochemical tests showed that reduction current of planar structure of Fe/Co fused triphenyl porphyrin dimer was on the potential range at -1.10 V to 0.45 V vs Au. Fe-fused triphenyl porphyrin dimer with 7.58 × 10–4 A (-1.05 V) showed slightly better performance than Co-fused triphenyl porphyrin dimer with 5.67 × 10–4 A (-0.97 V).

DOI： 10.22146/ijc.61671

Open Access

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry ({RSC})  

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.

DOI： 10.1039/D1SC03800A

Open Access

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry ({RSC})  

DOI： 10.1039/D0TC06083F

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

<p>The tetraarylporphyrin/POM complexes with CT character show negative differential resistance because of the memristor-like behavior.</p>

DOI： 10.1039/D0TC04052E

Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

DOI： 10.1021/acs.jpcc.0c02109

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

<p>Mechanoresponsive turn-on of room-temperature phosphorescence of a metal-free organic 1,2-diketone is reported. Desymmetrization selectively modifies the emission of the crystal.</p>

DOI： 10.1039/d0cc01949f

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry ({RSC})  

DOI： 10.1039/C9TC04176A

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1021/acs.orglett.8b03169

Language：English   Publishing type：Research paper (scientific journal)   Publisher：WILEY-V C H VERLAG GMBH  

The boraformylation of allenes with B-2(pin)(2) and a formate ester as boron and formyl source, respectively, proceeds in the presence of a copper catalyst. The reaction selectively affords the corresponding -boryl ,-unsaturated aldehydes in good to high yields. Furthermore, the silaformylation of allenes was achieved with a formate ester and PhMe2Si-B(pin) as the silicon source.

DOI： 10.1002/anie.201611314

Web of Science

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：PERGAMON-ELSEVIER SCIENCE LTD  

Cationic polymerization of vinyl ethers using a multifunctional dendritic initiator and multifunctional terminators in a flow microreactor system gave polymers having multiple functionalities on both ends. Subsequent transformation of the resulting polymers through Suzuki-Miyaura coupling and/or copper-mediated azide-alkyne cycloaddition gave linear-dendritic hybrid polymers. (C) 2016 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.eurpolymj.2016.02.021

Web of Science

Language：English   Publishing type：Research paper (scientific journal)   Publisher：PERGAMON-ELSEVIER SCIENCE LTD  

Cationic polymerization of vinyl ethers initiated by an electrogenerated dendritic diarylcarbenium ion in the presence of 2,6-di-tert-butylpyridine was developed using a flow microreactor. The carbocationic polymer end generated by polymerization of isobutyl vinyl ether was effectively trapped by various nucleophiles such as trimethyl(1-phenylvinyloxy)silane and allyltrimethylsilane to give polymers with very narrow molecular weight distribution. The block copolymerization of two vinyl ethers followed by trapping with nucleophiles was successfully accomplished to give structurally well-defined macromolecules. (C) 2015 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.tet.2015.05.096

Web of Science

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：CHEMICAL SOC JAPAN  

The copper-catalyzed silylative allylation of ketones with allenes and silylboranes via an in situ generated beta-silylallyl-copper intermediate has been developed. Various ketones and allenes were converted to the homoallylic tertiary alcohols bearing internal (E)-vinylsilane moieties regio- and stereo-selectively in good to high yields. Aldehydes were also employed as electrophiles in the reaction.

DOI： 10.1246/cl.141018

Web of Science

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：ROYAL SOC CHEMISTRY  

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 and easy-to-handle reducing agents, various allenes can be reacted with CO2 to regioselectively obtain homoallylic alcohols. Esters and other reducible functionalities on the allenes remain intact during the reaction, whereas CO2 is reduced to alcohol oxidation level.

DOI： 10.1039/c5cc03932k

Web of Science

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER CHEMICAL SOC  

A regiodivergent silacarboxylation of allenes under a CO2 atmosphere with PhMe2Si-B(pin) as a silicon source in the presence of a copper catalyst at 70 degrees C has been developed. The regioselectivity of the reaction is successfully reversed by the proper choice of ligand; carboxylated vinylsilanes are obtained with rac-Me-DuPhos as the ligand, whereas the use of PCy3 affords carboxylated allylsilanes. Thus, two different carboxylated silanes can be selectively and regiodivergently synthesized from a single allene substrate.

DOI： 10.1021/ja512040c

Web of Science

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER CHEMICAL SOC  

The nickel-catalyzed double carboxylation of internal allcynes employing carbon dioxide (CO2) has been developed. The reactions proceed under CO2 (1 atm) at room temperature in the presence of a nickel catalyst, Zn powder as a reducing reagent, and MgBr2 as an indispensable additive. Various internal alkynes could be converted to the corresponding maleic anhydrides in good to high yields. DFT calculations disclosed the indispensable role of MgBr2 in the second CO2 insertion.

DOI： 10.1021/ol502538r

Web of Science

Language：English   Publishing type：Research paper (scientific journal)   Publisher：WILEY-V C H VERLAG GMBH  

DOI： 10.1002/anie.201207148

Web of Science

Language：Japanese   Publisher：The Japan Petroleum Institute  

Carbon dioxide (CO₂) is a readily available and renewable chemical feedstock, although thermodynamic considerations limit its widespread use in chemical reactions. For effective utilization of CO₂, transition-metal catalysts are requisite. In the present study, we report copper-catalyzed hydrocarboxylation and silacarboxylation of alkynes using CO₂ (1 atm).&nbsp;

DOI： 10.11523/sekiyu.2012.0_12

CiNii Research

Language：Japanese  

J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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Language：Japanese  

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Language：Japanese  

Language：English   Presentation type：Oral presentation (general)  

Language：English   Presentation type：Oral presentation (general)  

Language：English   Presentation type：Oral presentation (general)  

Venue：Ottawa   Country：Canada  

Language：English   Presentation type：Oral presentation (general)  

Venue：Amsterdam   Country：Netherlands  

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：San Francisco   Country：United States  

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：Turin   Country：Italy  

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：Milan   Country：Italy  

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：Singapore   Country：Singapore