Bulletin of the Chemical Society of Japan最新文献_第10页

Chemical Structure Evaluations of Amine Hardeners to Ensure and Predict the Performance of Wet Adhesion of Epoxies 胺类硬化剂的化学结构评价以保证和预测环氧树脂的湿粘接性能

3区化学

Bulletin of the Chemical Society of Japan Pub Date : 2023-10-18 DOI: 10.1246/bcsj.20230218

Yasuyuki Nakamura, Yusuke Hibi, Kimiyoshi Naito, Norie Yamamoto, Misato Hanamura

引用次数: 0

N-Borane-Substituted Cyclic Phosphine Imides (BCPIs) n -硼烷取代环膦亚胺(BCPIs)

3区化学

Bulletin of the Chemical Society of Japan Pub Date : 2023-10-18 DOI: 10.1246/bcsj.20230228

Shun Nagai, Takaya Hinogami, Sensuke Ogoshi, Yoichi Hoshimoto

{"title":"<i>N</i>-Borane-Substituted Cyclic Phosphine Imides (BCPIs)","authors":"Shun Nagai, Takaya Hinogami, Sensuke Ogoshi, Yoichi Hoshimoto","doi":"10.1246/bcsj.20230228","DOIUrl":"https://doi.org/10.1246/bcsj.20230228","url":null,"abstract":"Phosphine imides are ubiquitous nucleophiles/Lewis bases in modern organic chemistry. The introduction of unexplored substituents on the phosphine imidoyl nitrogen and/or phosphorus atoms should facilitate the discovery of unprecedented utility for phosphine imides. Herein, we have designed and prepared a novel class of phosphine imides known as N -borane-substituted cyclic phosphine imides (BCPIs). Experimental and theoretical analyses of the electronic structure of BCPIs demonstrate the existence of substantial negative hyperconjugation between the nitrogen and the phosphorus atoms. Given a characteristic nucleophilic/Lewis basic reactivity of BCPIs, we represent the first experimental demonstration that a  5 -oxazaphosphetane species is a key intermediate in the transformation of CO 2 using phosphine imides. Moreover, although it has been previously considered unlikely, the spontaneous heterolysis of a B ‒ Cl bond in a BCPI-coordinated chloroborane has been directly observed, suggesting that such process is a plausible key step in the Lewis acid-promoted generation of borenium species from chloroboranes. These results thus provide evidence of two species that have been missing in contemporary organic chemistry. Graphical Abstract","PeriodicalId":9511,"journal":{"name":"Bulletin of the Chemical Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135824051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficient Method for the Preparation of Ozonides Under Dry Conditions 在干燥条件下制备臭氧化物的有效方法

3区化学

Bulletin of the Chemical Society of Japan Pub Date : 2023-10-18 DOI: 10.1246/bcsj.20230195

Mohamed R. El-kholany, Nana Kishimoto, Kenta Tanaka, Hiroyoshi Takamura, Isao Kadota

引用次数: 0

Highly Functional Acyclic Xeno Nucleic Acids 高功能无环Xeno核酸

3区化学

Bulletin of the Chemical Society of Japan Pub Date : 2023-10-15 DOI: 10.1246/bcsj.20230188

Keiji Murayama, Hikari Okita, Hiroyuki Asanuma

引用次数: 0

Freeze-Concentrated Layers as a Unique Field for the Formation of Hydrogels 冷冻浓缩层作为水凝胶形成的独特领域

3区化学

Bulletin of the Chemical Society of Japan Pub Date : 2023-10-15 DOI: 10.1246/bcsj.20230146

Yurina Sekine, Takuya Nankawa

{"title":"Freeze-Concentrated Layers as a Unique Field for the Formation of Hydrogels","authors":"Yurina Sekine, Takuya Nankawa","doi":"10.1246/bcsj.20230146","DOIUrl":"https://doi.org/10.1246/bcsj.20230146","url":null,"abstract":"The phase separation of ice crystals and solutes and bound water that occurs during freezing can be used as a reaction field to control a hierarchical structure of hydrogels. Here, we present a study of carboxymethyl cellulose nanofiber (CMCF) hydrogels formed using solid-quasi liquid phase separation. CMCF hydrogels were formed simply by adding citric acid to frozen CMCF and thawing the mixture. The compressive strength of the freeze crosslinked CMCF was 200,000 times higher than that of CMCF hydrogel formed by a conventional crosslinking method. It was found that rearrangement of CMCF structures via hydrogen bonding proceeds in the freeze concentration layer before the ice crystals melt. Under freeze concentration, CMCF and bound water are confined at high concentrations. The crosslinking reaction in such a unique space contributed to the formation of CMCF hydrogel with high mechanical strength. We discuss the gelation behavior and properties of freeze crosslinked CMCF hydrogels and their applications. The phase separation of ice crystals and solutes and bound water that occurs during freezing can be used as a reaction field to form structurally ordered hydrogels. This paper presents a study of freeze-crosslinked carboxymethyl cellulose nanofiber (CMCF) hydrogels with high mechanical strength formed using the solid-quasi liquid phase separation.","PeriodicalId":9511,"journal":{"name":"Bulletin of the Chemical Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135761265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Metal-Organodiphosphonate Chemistry: Hydrothermal Syntheses and Structures of Two Novel Copper(II) Coordination Polymers with o-Xylylenediphosphonic Acid and 4,4′-Bipyridine Ligands 金属-有机二膦酸盐化学:水热合成和两种新型铜(II)配位聚合物与邻二甲苯二膦酸和4,4 ' -联吡啶配体的结构

3区化学

Bulletin of the Chemical Society of Japan Pub Date : 2023-10-15 DOI: 10.1246/bcsj.20230160

Burak Ay, Rina Takano, Takayuki Ishida

引用次数: 0

Sublimable Surfactant for Carbon Nanotube Dispersion: Effect of the Length of 10-n-Alkyl Side Chains of Flavin on Sublimation 用于碳纳米管分散的可升华表面活性剂:黄素10-n-烷基侧链长度对升华的影响

3区化学

Bulletin of the Chemical Society of Japan Pub Date : 2023-10-14 DOI: 10.1246/bcsj.20230204

Yuichi Kato, Takushi Sugino

引用次数: 0

Bright Red-color Luminescence from Ag−In−Ga−S-based Quantum Dots with the introduction of Copper 引入铜的Ag−In−Ga−基量子点的亮红色发光

3区化学

Bulletin of the Chemical Society of Japan Pub Date : 2023-10-11 DOI: 10.1246/bcsj.20230216

Taro Uematsu, Navapat Krobkrong, Kenichiro Asai, Genichi Motomura, Yoshihide Fujisaki, Tsukasa Torimoto, Susumu Kuwabata

{"title":"Bright Red-color Luminescence from Ag−In−Ga−S-based Quantum Dots with the introduction of Copper","authors":"Taro Uematsu, Navapat Krobkrong, Kenichiro Asai, Genichi Motomura, Yoshihide Fujisaki, Tsukasa Torimoto, Susumu Kuwabata","doi":"10.1246/bcsj.20230216","DOIUrl":"https://doi.org/10.1246/bcsj.20230216","url":null,"abstract":"This study presents cadmium-free, red-emission quantum dots (QDs) synthesized by incorporating Cu into silver indium gallium sulfide/gallium sulfide (Ag–In–Ga–S/Ga–S) core/shell QDs. By using a previous technique, in which the original Ag–In–Ga–S/Ga–S core/shell QDs exhibiting band-edge photoluminescence (PL) were improved to achieve a narrower emission and facile synthesis, we injected a mixture of Cu and Ag sources into a heated solution containing In, Ga, and S sources. This resulted in the formation of Ag–Cu–In–Ga–S quinary QDs without any precipitation. After being coated with a Ga–S shell, these QDs exhibit a red-colored PL with a spectral full-width at half maximum of 55–60 nm. Although the PL wavelength was responsive to changes in In/Ga ratios, it was unaffected by variations in Cu/Ag ratios due to the transition between conduction band electrons and holes localized at Cu cites. Notably, the electroluminescence device exhibited high-purity red light that satisfies the recommendation ITU-R BT.2020 standard. Cadmium-free Ag–Cu–In–Ga–S/Ga–S core/shell quantum dots were synthesized by a scalable method and red emission was obtained from a free-to-bound transition via Cu-related localized states. The emission wavelength was controlled by the In/Ga ratio, which allowed the fabrication of high-purity red electroluminescence in compliance with the ITU-R BT.2020 standard.","PeriodicalId":9511,"journal":{"name":"Bulletin of the Chemical Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136059207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enzyme-mimetic Catalyst Architectures: The Role of Second Coordination Sphere in Catalytic Activity 模拟酶催化剂结构:第二配位球在催化活性中的作用

3区化学

Bulletin of the Chemical Society of Japan Pub Date : 2023-10-07 DOI: 10.1246/bcsj.20230224

Bappaditya Roy, Thimmaiah Govindaraju

{"title":"Enzyme-mimetic Catalyst Architectures: The Role of Second Coordination Sphere in Catalytic Activity","authors":"Bappaditya Roy, Thimmaiah Govindaraju","doi":"10.1246/bcsj.20230224","DOIUrl":"https://doi.org/10.1246/bcsj.20230224","url":null,"abstract":"Enzymes with well-defined three-dimensional structure have in-built information for molecular organization in the near vicinity of the active sites – popularly known as enzyme architecture. Over the past few years, molecular assembly has been exploited in creating artificial enzyme or catalyst architectures. Emergent spatiotemporal structure and catalytic activity can be achieved through controlled assembly of suitable molecular building blocks. The programmed molecular assembly governed by the scheme of molecule architectonics can generate enzyme-mimetic catalyst assembly-architecture. Apart from the conventional ligand-metal interaction in the first coordination sphere of a catalyst, second coordination sphere play key role in the catalytic activity of enzymes. This review attempts to unravel the balancing act between molecular architectonics and second coordination sphere in catalyst assembly-architectures development. Judicious design and exploitation of the state-of-the-art biomimetic catalyst architectures derived from small molecules, sugars, nucleic acids, peptides, and proteins are discussed under the above-mentioned framework. Metal-coordinated molecular assembly-architectures of specific catalytic property are considered with respect to the nature of molecular assembly and experimental conditions. The concise and critical discussion provide a holistic view on the enzyme-mimetic architectures and their second coordination sphere through reductionistic approach-based on the molecular architectonics of simple and modular molecular building blocks. This review highlights the contribution of molecular architectonics and second coordination sphere theory in designing state-of-the-art catalyst assembly-architectures as enzyme-mimetics.","PeriodicalId":9511,"journal":{"name":"Bulletin of the Chemical Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135252068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

SciPROP-R: An Effective Bisphosphine Ligand for the Chemo-selective Iron-Catalyzed Suzuki–Miyaura Coupling of Alkyl Chlorides 化学选择性铁催化烷基氯化物Suzuki-Miyaura偶联的有效双膦配体

3区化学

Bulletin of the Chemical Society of Japan Pub Date : 2023-10-07 DOI: 10.1246/bcsj.20230180

Sho Nakajima, Toru Hashimoto, Siming Lu, Daisuke Hashizume, Hiroshi Matsuda, Takuji Hatakeyama, Katsuhiro Isozaki, Hikaru Takaya, Masaharu Nakamura

{"title":"SciPROP-R: An Effective Bisphosphine Ligand for the Chemo-selective Iron-Catalyzed Suzuki–Miyaura Coupling of Alkyl Chlorides","authors":"Sho Nakajima, Toru Hashimoto, Siming Lu, Daisuke Hashizume, Hiroshi Matsuda, Takuji Hatakeyama, Katsuhiro Isozaki, Hikaru Takaya, Masaharu Nakamura","doi":"10.1246/bcsj.20230180","DOIUrl":"https://doi.org/10.1246/bcsj.20230180","url":null,"abstract":"Novel 2-substituted 1,3-bis[bis(3’,5’-di-tert-butyl phenyl)phosphino]propanes (SciPROP-R; 1-R), as well as their iron complexes FeCl2(SciPROP-R) 2-R, are synthesized. Single-crystal X-ray analysis and solution-phase Fe K- and L-edge XAS of 2-R reveals that these complexes maintain tetrahedral geometry and hence of paramagnetic high-spin properties both in the solid state and in the solution phase. 31P NMR results demonstrate that the superior coordination ability of SciPROP-TB (1-TB) is due to the bulky tert-butyl group at position 2 of the propane-1,3-diyl linker of the ligand. These novel iron-complexes catalyze Suzuki–Miyaura-type cross coupling under mild conditions. Notably, Iron(II) chloride–1-TB complex (2-TB) exhibits excellent catalytic activity owing to the high coordination ability and electron-donating nature of 1-TB, being effective for chemoselective cross coupling between various alkyl chlorides and arylboron compounds. A series of 2-R-substituted 1,3-bis[bis(3’,5’-di-tert-butyl phenyl)phosphino]propane SciPROP-R are designed and synthesized. Their iron complexes, especially FeCl2(SciPROP-TB), are effective catalysts for the highly chemoselective iron-catalyzed Suzuki–Miyaura-type cross-coupling reaction of alkyl chlorides with arylboron compounds.","PeriodicalId":9511,"journal":{"name":"Bulletin of the Chemical Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135252066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0