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Rotational Isomerism of Amide Units in the Ring of Rotaxanes in Response to Base/Acid Stimuli 在碱/酸刺激下旋吐烷环中酰胺单元的旋转异构现象
IF 1.6 4区 化学
Chemistry Letters Pub Date : 2024-07-25 DOI: 10.1093/chemle/upae143
Takanori Nakamura, Yukari Okuma, Shinobu Miyagawa, Tsuneomi Kawasaki, Masaya Naito, Yuji Tokunaga
{"title":"Rotational Isomerism of Amide Units in the Ring of Rotaxanes in Response to Base/Acid Stimuli","authors":"Takanori Nakamura, Yukari Okuma, Shinobu Miyagawa, Tsuneomi Kawasaki, Masaya Naito, Yuji Tokunaga","doi":"10.1093/chemle/upae143","DOIUrl":"https://doi.org/10.1093/chemle/upae143","url":null,"abstract":"Rotational isomerism of four amide moieties of the threaded macrocyclic component of [2]rotaxanes featuring mono- and bis-ammonium moieties in dumbbell-shaped axle components were investigated in response to base, and the rotational isomerization of both rotaxanes could be controlled reversibly through the addition of appropriate amounts of base and acids.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"73 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141770582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Finding Atomic Dynamics in Metal and Alloy Subnanometer Clusters 寻找金属和合金亚纳米团簇中的原子动力学特性
IF 1.6 4区 化学
Chemistry Letters Pub Date : 2024-07-25 DOI: 10.1093/chemle/upae147
Takane Imaoka, Kimihisa Yamamoto
{"title":"Finding Atomic Dynamics in Metal and Alloy Subnanometer Clusters","authors":"Takane Imaoka, Kimihisa Yamamoto","doi":"10.1093/chemle/upae147","DOIUrl":"https://doi.org/10.1093/chemle/upae147","url":null,"abstract":"This highlight review explains advanced structural analysis techniques utilizing electron microscopy to uncover various properties and phenomena in subnanometer clusters that were previously unknown in larger nanoparticles. The discoveries introduced the concept of “subnano alloying,” where different elements mix at the atomic level in arbitrary proportions, leading to enhanced catalytic performance. Additionally, the behavior and dynamics of these clusters were examined to gain insights into their stability and reactivity. These findings have significant implications for the design of advanced materials with tailored properties and improved catalytic applications.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"62 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141770588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Synthesis of Pd–Pt–P amorphous nanoparticles Pd-Pt-P 无定形纳米颗粒的合成
IF 1.6 4区 化学
Chemistry Letters Pub Date : 2024-07-24 DOI: 10.1093/chemle/upae144
Kenta Ikeda, Megumi Mukoyoshi, Kohei Kusada, Tomokazu Yamamoto, Yasukazu Murakami, Hiroshi Kitagawa
{"title":"Synthesis of Pd–Pt–P amorphous nanoparticles","authors":"Kenta Ikeda, Megumi Mukoyoshi, Kohei Kusada, Tomokazu Yamamoto, Yasukazu Murakami, Hiroshi Kitagawa","doi":"10.1093/chemle/upae144","DOIUrl":"https://doi.org/10.1093/chemle/upae144","url":null,"abstract":"Amorphous materials are very attractive materials because of their unique properties, including high corrosion resistance and catalytic activity. Creating such materials on a nanoscale is very effective in maximizing their performance. However, it is difficult to synthesize amorphous nanomaterials by conventional rapid cooling methods, commonly used for bulk amorphous materials. Therefore, there are not as many reports about amorphous nanomaterials as bulk materials. Herein we report the first synthesis of Pd–Pt–P amorphous nanoparticles by a two-step synthesis method. They were also characterized.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"15 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141770585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Synthesis of Au@Pd core-shell nanoparticles by ultrafine bubbles and ultrasound without capping and reducing agents 利用超微气泡和超声波合成 Au@Pd 核壳纳米粒子，无需封盖剂和还原剂
IF 1.6 4区 化学
Chemistry Letters Pub Date : 2024-07-24 DOI: 10.1093/chemle/upae145
Keiji Yasuda, Takuya Iwata, Yuki Mizuno, Yuta Yamamoto
{"title":"Synthesis of Au@Pd core-shell nanoparticles by ultrafine bubbles and ultrasound without capping and reducing agents","authors":"Keiji Yasuda, Takuya Iwata, Yuki Mizuno, Yuta Yamamoto","doi":"10.1093/chemle/upae145","DOIUrl":"https://doi.org/10.1093/chemle/upae145","url":null,"abstract":"This paper, for the first time, reports on synthesis of Au@Pd core-shell nanoparticles in the absence of any capping and reducing agents by ultrafine bubbles and ultrasound. The mean diameter of the bimetallic core-shell nanoparticles was controlled by the ultrafine bubble concentration during the synthesis. The Pd shell thickness also varied with the concentration of Pd(II) ions. These Au@Pd core-shell nanoparticles showed excellent catalytic performance due to the pure surface without any capping and reducing agents.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"25 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141770589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Aggregation of positively charged poly(methyl methacrylate) latex particles in the presence of trifluoromethanesulfonate anion 带正电荷的聚（甲基丙烯酸甲酯）胶乳颗粒在三氟甲磺酸阴离子存在下的聚合作用
IF 1.6 4区 化学
Chemistry Letters Pub Date : 2024-07-24 DOI: 10.1093/chemle/upae136
Takashi Yamazaki, Toshikazu Tsuji
{"title":"Aggregation of positively charged poly(methyl methacrylate) latex particles in the presence of trifluoromethanesulfonate anion","authors":"Takashi Yamazaki, Toshikazu Tsuji","doi":"10.1093/chemle/upae136","DOIUrl":"https://doi.org/10.1093/chemle/upae136","url":null,"abstract":"We investigated the unique aggregation behavior of 3 types of positively charged poly(methyl methacrylate) (PMMA) latex particles in the presence of a trifluoromethanesulfonate (triflate) anion. The particles were prepared based on surfactant-free emulsion polymerization using azo radical initiators. The triflate anion was strongly adsorbed to surfaces of positively charged PMMA latex particles, as confirmed by electrophoresis. Additionally, its presence significantly reduced the critical coagulation concentration of the cationic PMMA latex particles compared with other anions.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"25 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141770586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
pH-dependent interaction between acetaminophen and dioleoylphosphatidylcholine membranes 对乙酰氨基酚与二油酰磷脂酰胆碱膜之间受 pH 值影响的相互作用
IF 1.6 4区 化学
Chemistry Letters Pub Date : 2024-07-12 DOI: 10.1093/chemle/upae133
Kodai Ishikawa, Hideki Nabika
{"title":"pH-dependent interaction between acetaminophen and dioleoylphosphatidylcholine membranes","authors":"Kodai Ishikawa, Hideki Nabika","doi":"10.1093/chemle/upae133","DOIUrl":"https://doi.org/10.1093/chemle/upae133","url":null,"abstract":"Acetaminophen may cause acute liver failure due to overdose. Understanding the processes of adsorption and incorporation of acetaminophen into cell membranes is crucial for elucidating the mechanisms of action and toxicity of acetaminophen. We investigated the interaction between acetaminophen and a model cell membrane (dioleoylphosphatidylcholine) using surface pressure–area isotherms. Acetaminophen was incorporated into the dioleoylphosphatidylcholine membrane under basic conditions, increasing the dioleoylphosphatidylcholine molecular area. The acetaminophen uptake was explained by the adsorption of hydroxide ions onto the lipid membrane and electrostatic interaction between acetaminophen and lipid molecules under basic conditions.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"63 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141613897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Magnetic Properties of N-Nonylphenothiazine Radical Cations Depending on Counter Anions 取决于反阴离子的 N-壬基吩噻嗪自由基阳离子的磁性能
IF 1.6 4区 化学
Chemistry Letters Pub Date : 2024-07-11 DOI: 10.1093/chemle/upae135
Sett Aung Naing, Takeshi Naota, Daisuke Shiomi, Kentaro Matsuda, Kazunobu Sato, Shuichi Suzuki
{"title":"Magnetic Properties of N-Nonylphenothiazine Radical Cations Depending on Counter Anions","authors":"Sett Aung Naing, Takeshi Naota, Daisuke Shiomi, Kentaro Matsuda, Kazunobu Sato, Shuichi Suzuki","doi":"10.1093/chemle/upae135","DOIUrl":"https://doi.org/10.1093/chemle/upae135","url":null,"abstract":"Magnetic properties of N-nonylphenothiazine radical cations were found to vary depending on their counter ions. The radical cations in NTf2– (bis(N-trifluoromethanesulfonyl)imide ion), OTf– (trifluoromethanesulfonate), and BF4– salts formed π-dimer with strong antiferromagnetic interactions. The SbF6– salt exhibited paramagnetic properties with quite weak antiferromagnetic interaction. Interestingly, the NTf2– salt transformed to the paramagnetic liquid state upon heating to 78 oC.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"47 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141613900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
A Simple Synthesis of Luminescent π-Conjugated Materials having fDTBT Derivatives 具有 fDTBT 衍生物的发光 π 共轭材料的简单合成方法
IF 1.6 4区 化学
Chemistry Letters Pub Date : 2024-07-11 DOI: 10.1093/chemle/upae141
Yuta Nakagawa, Kensyo Miki, Yoshihiro Yamaguchi
{"title":"A Simple Synthesis of Luminescent π-Conjugated Materials having fDTBT Derivatives","authors":"Yuta Nakagawa, Kensyo Miki, Yoshihiro Yamaguchi","doi":"10.1093/chemle/upae141","DOIUrl":"https://doi.org/10.1093/chemle/upae141","url":null,"abstract":"We developed a simple and rapid process for synthesizing dithieno[3',2':3,4; 2'',3'':5,6]benzo[1,2-c][1,2,5]thiadiazole (fDTBT) derivatives using crystalline sulfur and internal alkynes, wherein thiophene is cyclized to benzothiadiazole. Cyclized derivatives were synthesized in three or five steps using this reaction, whereas the conventional synthesis methods involved seven steps and hazardous reactions with explosive properties. The absorption spectra of the synthesized fDTBT derivatives in chloroform solution revealed a new absorption band owing to the cyclization. All three compounds exhibited orange-to-red luminescence, and the maximum absolute quantum yield was determined to be 67%, demonstrating excellent luminescence.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"42 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141613899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Solid-state Dynamics of Binuclear N-Heterocyclic Carbene Au(I) Rotor with para-Phenylene Rotator 双核 N-Heterocyclic Carbene Au(I)旋转体与对位苯旋转体的固态动力学
IF 1.6 4区 化学
Chemistry Letters Pub Date : 2024-07-11 DOI: 10.1093/chemle/upae139
Pingyu Jiang, Alexander S Mikherdov, Hajime Ito, Mingoo Jin
{"title":"Solid-state Dynamics of Binuclear N-Heterocyclic Carbene Au(I) Rotor with para-Phenylene Rotator","authors":"Pingyu Jiang, Alexander S Mikherdov, Hajime Ito, Mingoo Jin","doi":"10.1093/chemle/upae139","DOIUrl":"https://doi.org/10.1093/chemle/upae139","url":null,"abstract":"Molecular dynamics in the crystalline solid state, typically constrained by a densely packed crystal environment, may offer opportunities to control the physical properties of solid-state materials. In this work, a neutral crystalline molecular rotor featuring a para-phenylene rotator encapsulated by N-heterocyclic carbene ligands and connected via a C-Au-C rotational axis is presented. Single-crystal X-ray diffraction studies, along with variable-temperature solid-state 2H NMR spin-echo measurements, confirm the presence of 180° 2-fold rotational dynamics of the para-phenylene moiety in the solid state.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"13 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141613898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Microstructure of monolayered aggregate of 5-(4-carboxyphenyl)-10,15,20-triphenylporphine self-assembled at the toluene/water interface 在甲苯/水界面自组装的 5-(4-羧基苯基)-10,15,20-三苯基卟吩单层聚合体的微观结构
IF 1.6 4区 化学
Chemistry Letters Pub Date : 2024-07-10 DOI: 10.1093/chemle/upae108
Tania Avianda Gusman, Satoshi Tsukahara
{"title":"Microstructure of monolayered aggregate of 5-(4-carboxyphenyl)-10,15,20-triphenylporphine self-assembled at the toluene/water interface","authors":"Tania Avianda Gusman, Satoshi Tsukahara","doi":"10.1093/chemle/upae108","DOIUrl":"https://doi.org/10.1093/chemle/upae108","url":null,"abstract":"5-(4-Carboxyphenyl)-10,15,20-triphenylporphine (TPPCOOH) was acid-dissociated and its salt with alkali metal ions (TPPCOO−M+, M+=Li+, Na+, and K+) formed ordered needlelike monolayered aggregates at the toluene/water interface under alkaline conditions. The light absorption of the aggregates at 451 nm depended on the polarization direction. The dependence revealed 2 types of TPPCOO−M+ aggregates with different growth direction, but their microstructure and interfacial concentration were almost the same. The height of the aggregates measured by atomic force microscopy was approximately equivalent to that of titled TPPCOO−.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"22 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141585842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
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