研究者詳細 - 髙石　和人

論文 - 髙石　和人

分割表示 79 件中 1 - 20 件目／全件表示 >>

A Binaphthyl Macrocycle Exhibiting Circularly Polarized Luminescence: On–off Switch Triggered by Molecular Recognition

Kazuto Takaishi, Itsuki Taniuchi, Sho Miyashita, Kei Yabushita, Tadashi Ema

Chemistry – A European Journal 2025年4月

Deoxygenative dual CO2 conversions: methylenation and switchable N-formylation/N-methylation of tryptamines

Kazuto Takaishi, Hajime Morishita, Kosuke Iwaki, Tadashi Ema

Green Chemistry 2025年

Temperature‐Induced Sign Inversion of Circularly Polarized Luminescence of Binaphthyl‐Bridged Tetrathiapyrenophanes

Kazuto Takaishi, Fumiya Yoshinami, Yoshihiro Sato, Tadashi Ema

Chemistry – A European Journal 2024年6月

Skeletal Formation of Carbocycles with CO2: Selective Synthesis of Indolo[3,2-b]carbazoles or Cyclophanes from Indoles, CO2, and Phenylsilane

Sha Li, Shoko Nakahara, Taishin Adachi, Takumi Murata, Kazuto Takaishi, Tadashi Ema

Journal of the American Chemical Society 2024年6月

One-Pot Synthesis of Dihydropyrans via CO2 Reduction and Domino Knoevenagel/oxa-Diels–Alder Reactions

Kazuto Takaishi, Ritsuki Nishimura, Yuha Toda, Hajime Morishita, Tadashi Ema

Organic Letters 2023年3月

Circularly polarized luminescence from porphyrin-containing (supra)molecular systems

Chihiro Maeda, Issa Yasutomo, Kazuto Takaishi, Tadashi Ema

Journal of Porphyrins and Phthalocyanines 27 ( 07n10 ) 903 - 911 2023年2月

掲載種別：研究論文（学術雑誌）出版者・発行元：World Scientific Pub Co Pte Ltd

Functional dyes showing circularly polarized luminescence (CPL) have attracted considerable attention. Porphyrins and porphyrinoids have characteristic properties useful for the development of CPL materials, although the examples of CPL-active porphyrins and porphyrinoids are still limited. Here we have summarized recent progress in CPL-active systems containing porphyrins or phthalocyanines, which are classified into the following four categories: (i) porphyrins with chiral sources; (ii) axially chiral porphyrin dimers; (iii) self-assembled porphyrins; (iv) porphyrin-sensitized CPL dyes.

DOI： 10.1142/s108842462330001x

researchmap

Circularly polarized luminescence in molecular recognition systems: Recent achievements

Kazuto Takaishi, Chihiro Maeda, Tadashi Ema

Chirality 35 ( 2 ) 92 - 103 2022年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Wiley

Abstract

Circularly polarized luminescence (CPL) dyes are recognized to be new generation materials and have been actively developed. Molecular recognition systems provide nice approaches to novel CPL materials, such as stimuli‐responsive switches and chemical sensing materials. CPL may be induced simply by mixing chiral or achiral, luminescent or nonluminescent host and guest; there are several combinations. Molecular recognition can potentially save time and effort to construct well‐ordered chiral structures with noncovalent attractive interactions as compared with the multi‐step synthesis of covalently bonded dyes. It is a challenging subject to engage molecular recognition events with CPL, and it is important and interesting to see how it is achieved. In fact, simple molecular recognition systems can even enable the fine adjustment of CPL performance and detailed conformational/configurational analysis of the excited state. Here we overview the recent achievements of simple host–guest complexes capable of exhibiting CPL, summarizing concisely the host/guest structures, CPL intensities, and characteristics.

DOI： 10.1002/chir.23522

researchmap

その他リンク： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/chir.23522

Binaphthyl‐Bridged Pyrenophanes: Intense Circularly Polarized Luminescence Based on a D2 Symmetry Strategy

Kazuto Takaishi, Sho Murakami, Fumiya Yoshinami, Tadashi Ema

Angewandte Chemie International Edition 2022年7月

Ruthenium Complexes Bearing Axially Chiral Bipyridyls: The Mismatched Diastereomer Showed Red Circularly Polarized Phosphorescence

Kazuto Takaishi

Chemistry - A European Journal 2022年1月

Binaphthyl-bridged pyrenophanes: Intense circularly polarized luminescence based on a D2 symmetry strategy 査読

Kazuto Takaishi, Sho Murakami, Fumiya Yoshinami, Tadashi Ema

Angewandte Chemie International Edition 61 e202204609 2022年

Ruthenium complexes bearing axially chiral bipyridyls: The mismatched diastereomer showed red circularly polarized phosphorescence 査読

Kazuto Takaishi, Yusuke Nakatsuka, Hitomi Asano, Yuya Yamada, Tadashi Ema

28 e202104212 2022年

Circularly Polarized Luminescence Liquids Based on Siloxybinaphthyls: Best Binaphthyl Dihedral Angle in the Excited State

Kazuto Takaishi, Tomoki Matsumoto, Miyu Kawataka, Tadashi Ema

Angewandte Chemie 133 ( 18 ) 10056 - 10060 2021年4月

Circularly Polarized Luminescence Liquids Based on Siloxybinaphthyls: Best Binaphthyl Dihedral Angle in the Excited State 査読

Kazuto Takaishi, Tomoki Matsumoto, Miyu Kawataka, Tadashi Ema

Angewandte Chemie - International Edition 60 ( 18 ) 9968 - 9972 2021年4月

C-Methylenation of anilines and indoles with CO2 and hydrosilane using a pentanuclear zinc complex catalyst 査読

Kazuto Takaishi, Hiroyasu Kosugi, Ritsuki Nishimura, Yuya Yamada, Tadashi Ema

Chemical Communications 57 ( 65 ) 8083 - 8086 2021年

Chiral exciplex dyes showing circularly polarized luminescence: extension of the excimer chirality rule 査読

Kazuto Takaishi, Sho Murakami, Kazuhiro Iwachido, Tadashi Ema

Chemical Science 12 ( 43 ) 14570 - 14576 2021年

Aggregation‐Induced Circularly Polarized Luminescence from Boron Complexes with a Carbazolyl Schiff Base 査読国際誌

Chihiro Maeda, Shuichi Nomoto, Kazuto Takaishi, Tadashi Ema

Chemistry – A European Journal 26 ( 57 ) 13016 - 13021 2020年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Wiley

A variety of carbazolyl-appended Schiff bases were readily synthesized from 1-formylcarbazoles and aniline derivatives. Boron complexation of the resulting ligands allowed for facile preparation of new carbazole-based BODIPY analogues showing solid-state fluorescence. Furthermore, some dyes were converted into chiral compounds through the Et2 AlCl-mediated incorporation of a binaphthyl unit. The chiral dyes showed aggregation-induced fluorescence and circularly polarized luminescence (CPL) with the ΦF and glum of up to 0.22 and -3.5×10-3 , respectively, in the solid state. The solid-state fluorescence and CPL were well characterized by the crystal packing analyses and DFT calculations.

DOI： 10.1002/chem.202001463

PubMed

researchmap

Tetrameric and Hexameric Porphyrin Nanorings: Template Synthesis and Photophysical Properties 査読国際誌

Chihiro Maeda, Shoki Toyama, Naoki Okada, Kazuto Takaishi, Seongsoo Kang, Dongho Kim, Tadashi Ema

Journal of the American Chemical Society 142 ( 37 ) 15661 - 15666 2020年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society ({ACS})

Hexameric and tetrameric porphyrin nanorings, Z6·T6 and Z4·T4, were synthesized in 53% and 14% yields, respectively, by the Sonogashira-type self-oligomerization of porphyrin monomer 1 using hexadentate template T6 and tetrapyridylporphyrin template T4. Template-free nanorings Z6 and Z4 were also prepared. The femtosecond transient absorption measurements revealed fast excitation energy hopping (EEH) along these nanorings with hopping rates of 2-5 ps. Treatment of Z6 with chiral template CT6 gave Z6·CT6 showing circular dichroism (CD) and circularly polarized luminescence (CPL) in the absorption and fluorescence regions of Z6, respectively, which indicates chirality transfer from CT6 to Z6.

DOI： 10.1021/jacs.0c07707

PubMed

researchmap

Synthesis and Chiroptical Properties of Chiral Carbazole-Based BODIPYs. 査読国際誌

Chihiro Maeda, Keita Suka, Keiji Nagahata, Kazuto Takaishi, Tadashi Ema

Chemistry (Weinheim an der Bergstrasse, Germany) 26 ( 19 ) 4261 - 4268 2020年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Wiley

A series of carbazole-based boron dipyrromethenes (BODIPYs) 2 a-g bearing binaphthyl units have been synthesized by the Et2 AlCl-mediated reaction of the corresponding BODIPY difluorides 1 a-g with 1,1'-binaphthalene-2,2'-diol. Substituents such as halogen, nitrile, and amino groups were tolerated under the reaction conditions, and the reaction of the phenylethynyl-substituted 1 h gave (R,R)-3 h bearing two binaphthyl units. The chiroptical properties of these dyes with different substituents were investigated by UV/Vis, CD, fluorescence, and circularly polarized luminescence (CPL) spectroscopy. The CD spectra showed Cotton effects in the absorption region of the BODIPY moieties. In addition, they showed CPL both in solution and in the solid state. Interestingly, several dyes recorded higher glum values in the solid state, probably due to intermolecular interactions. Because (R,R)-3 h recorded relatively low glum values, the diastereomer (R,S)-3 h was prepared. The (R,S) diastereomer showed intense CPL, which suggests a synergetic effect of the two binaphthyl groups. Finally, chiral carbazole-based BODIPY dimers have been synthesized for the first time and their chiroptical properties were investigated. They showed redshifted fluorescence and CPL, which reached the near-IR (NIR) region in the solid state.

DOI： 10.1002/chem.201904954

PubMed

researchmap

Solvent-Induced Sign Inversion of Circularly Polarized Luminescence: Control of Excimer Chirality by Hydrogen Bonding 査読

Kazuto Takaishi, Kazuhiro Iwachido, Tadashi Ema

Journal of the American Chemical Society 142 ( 4 ) 1774 - 1779 2020年1月

Macrocyclic multinuclear metal complexes acting as catalysts for organic synthesis 査読

Bikash Dev Nath, Kazuto Takaishi, Tadashi Ema

Catalysis Science & Technology 10 ( 1 ) 12 - 34 2020年

　前のページ - 次のページ　

<髙石 和人>

論文 - 髙石 和人

<髙石　和人>

論文 - 髙石　和人