Bulletin of the Chemical Society of Japan最新文献

Highly efficient direct air capture using solid–liquid phase separation in aqueous diamine solution as sorbent 利用二胺水溶液中的固液相分离作为吸附剂，高效直接捕获空气

IF 4 3区化学

Bulletin of the Chemical Society of Japan Pub Date : 2024-09-17 DOI: 10.1093/bulcsj/uoae096

Furong Cao, Soichi Kikkawa, Hidetaka Yamada, Seiji Yamazoe

{"title":"Highly efficient direct air capture using solid–liquid phase separation in aqueous diamine solution as sorbent","authors":"Furong Cao, Soichi Kikkawa, Hidetaka Yamada, Seiji Yamazoe","doi":"10.1093/bulcsj/uoae096","DOIUrl":"https://doi.org/10.1093/bulcsj/uoae096","url":null,"abstract":"To reduce climate change, absorbing CO2 directly from the air (DAC) with high-efficient CO2 absorption, low-cost, and environmentally friendly system has been attracted much attention for several decades. In this work, a series of aqueous diamine solutions was examined for 400ppm CO2 absorption at ambient temperature. The absorbents exhibited CO2 absorption with molar ratio of 1 molCO2/molamine, and aqueous isophorone diamine (IPDA) in particular showed &gt;99% CO2 removal even under a 500 mL min−1 flow of 400ppm CO2-N2 with the contact rate of 13,761.5 h−1 between CO2 and IPDA aqueous solution and the CO2 absorption rate of 4.46 mmol/L·min. A precipitate of carbamic acid of IPDA was formed by reaction with CO2, and the CO2 removal efficiency was enhanced by increasing the solution viscosity by the formation of this precipitate. The CO2 was absorbed in aqueous IPDA solution as carbamic acid of IPDA and bicarbonate/carbonate species, and the absorbed CO2 could desorb by heating under O2-containing gas flow, which indicates our system is applicable to the CO2 condensation for a plant growth. This work provides a fundamental information to establishing a solid–liquid phase change system with a high-efficient and environmentally friendly DAC system using aqueous solvent.","PeriodicalId":9511,"journal":{"name":"Bulletin of the Chemical Society of Japan","volume":"13 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249875","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

Acid-induced Conformational Switching of Helical Foldamers Containing Imidazole Amide 酸诱导含咪唑酰胺的螺旋折叠体的构象转换

IF 4 3区化学

Bulletin of the Chemical Society of Japan Pub Date : 2024-09-11 DOI: 10.1093/bulcsj/uoae094

Sakiko Kimura, Fumi Takeda, Ayano Ikeda, Asuka Tanimoto, Kosuke Katagiri, Masatoshi Kawahata, Yusuke Okada, Nagao Kobayashi, Hiroyuki Kagechika, Aya Tanatani

{"title":"Acid-induced Conformational Switching of Helical Foldamers Containing Imidazole Amide","authors":"Sakiko Kimura, Fumi Takeda, Ayano Ikeda, Asuka Tanimoto, Kosuke Katagiri, Masatoshi Kawahata, Yusuke Okada, Nagao Kobayashi, Hiroyuki Kagechika, Aya Tanatani","doi":"10.1093/bulcsj/uoae094","DOIUrl":"https://doi.org/10.1093/bulcsj/uoae094","url":null,"abstract":"N-Alkylated oligo- and poly(p-benzamide)s exist as dynamic helical structures with all-cis amide conformation. Imidazole N-alkylated amides also show cis conformational preference, but their major conformer is changed from cis to trans by addition of acid. Here, based on those findings, we designed and synthesized aromatic triamides 3 and hexaamides 4 containing an imidazole ring as candidate foldamers anticipated to exhibit acid-induced conformational change. X-Ray structure analysis of oligomer 3c showed that it takes all-cis conformation in the crystal. In solution, all the oligoamides examined existed as an equilibrium mixture of four conformers, among which the major conformer was the folded all-cis structure as judged from the low-temperature 1H NMR spectra. When trifluoroacetic acid-d was added to a solution of the oligoamides in methylene chloride-d2, only two conformers were observed in the low-temperature 1H NMR spectra, and the major conformer was the (trans, cis) form with respect to the amide bonds of the imidazole at the 4 and 2 positions. Experimental and theoretical analysis of the CD spectra indicated that the conformation of hexaamides 4 changes upon addition of acid. Our results suggest that N-alkylated imidazoleamide can serve as a key structural motif for the construction of foldamers with acid-switchable conformation.","PeriodicalId":9511,"journal":{"name":"Bulletin of the Chemical Society of Japan","volume":"32 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186103","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

Effect of the Supported Metal Species on Soot Oxidation over PGM/CeO2–ZrO2 支撑金属物种对 PGM/CeO2-ZrO2 氧化烟尘的影响

IF 4 3区化学

Bulletin of the Chemical Society of Japan Pub Date : 2024-09-11 DOI: 10.1093/bulcsj/uoae092

Hitoshi Kubo, Yusuke Ohshima, Shunsuke Kato, Noriyuki Saitoh, Noriko Yoshizawa, Osamu Nakagoe, Shuji Tanabe

{"title":"Effect of the Supported Metal Species on Soot Oxidation over PGM/CeO2–ZrO2","authors":"Hitoshi Kubo, Yusuke Ohshima, Shunsuke Kato, Noriyuki Saitoh, Noriko Yoshizawa, Osamu Nakagoe, Shuji Tanabe","doi":"10.1093/bulcsj/uoae092","DOIUrl":"https://doi.org/10.1093/bulcsj/uoae092","url":null,"abstract":"The soot oxidation over platinum group metal oxide/CeO2–ZrO2 (PGM/CZ) catalysts with different ability to capture gas-phase oxygen has been studied herein. The ability to capture gas-phase oxygen was in sequence of Ru/CZ &gt; Rh/CZ &gt; Ir/CZ &gt; Pt/CZ &gt; Pd/CZ. Soot oxidation test by TG-DTA showed that Ru/CZ, Rh/CZ, and Ir/CZ are highly active catalysts. It was found that there is a good correlation between the ability to capture gas-phase oxygen and soot oxidation activity. TEM observation revealed that soot oxidation mainly occurs at the interface between soot and CZ surface. The Ea values and soot oxidation test using labeled oxygen suggested that highly active catalysts oxidize soot by CZ lattice oxygen. For Ir/CZ, soot oxidation at 270°C occurred due to the reduction by soot. Ru/CZ and Rh/CZ captured gas-phase oxygen spontaneously below 250°C, resulting in soot oxidation at 270°C. H2-TPR results suggested that the reactivity of lattice oxygen in CZ surface improved by PGM is also related to soot oxidation activity. It was suggested that the ability to capture gas-phase oxygen and the reactivity of lattice oxygen in CZ surface determine the soot oxidation activity, and that Ru, Rh, and Ir have the effect of enhancing these properties.","PeriodicalId":9511,"journal":{"name":"Bulletin of the Chemical Society of Japan","volume":"7 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186102","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

Design of Cyborg Proteins by Loop Region Replacement with Oligo(ethylene glycol): Exploring Suitable Mutations for Cyborg Protein Construction Using Machine Learning 用寡聚（乙二醇）取代环区设计半机械蛋白质：利用机器学习探索构建半机械蛋白质的合适突变

IF 4 3区化学

Bulletin of the Chemical Society of Japan Pub Date : 2024-09-02 DOI: 10.1093/bulcsj/uoae090

Wijak Yospanya, Akari Matsumura, Yukihiro Imasato, Tomoyuki Itou, Yusuke Aoki, Hikaru Nakazawa, Takashi Matsui, Takeshi Yokoyama, Mihoko Ui, Mitsuo Umetsu, Satoru Nagatoishi, Kouhei Tsumoto, Yoshikazu Tanaka, Kazushi Kinbara

{"title":"Design of Cyborg Proteins by Loop Region Replacement with Oligo(ethylene glycol): Exploring Suitable Mutations for Cyborg Protein Construction Using Machine Learning","authors":"Wijak Yospanya, Akari Matsumura, Yukihiro Imasato, Tomoyuki Itou, Yusuke Aoki, Hikaru Nakazawa, Takashi Matsui, Takeshi Yokoyama, Mihoko Ui, Mitsuo Umetsu, Satoru Nagatoishi, Kouhei Tsumoto, Yoshikazu Tanaka, Kazushi Kinbara","doi":"10.1093/bulcsj/uoae090","DOIUrl":"https://doi.org/10.1093/bulcsj/uoae090","url":null,"abstract":"We synthesized a “cyborg protein,” wherein a synthetic molecule partially substitutes the main peptide chain by linking two protein domains with a synthetic oligomer. Green fluorescent protein (GFP) served as the model for constructing the cyborg proteins. We prepared circularly permuted GFP (cpGFP) with new termini between β10 and β11, where the original N- and C-termini were linked by a cleavable peptide loop. The cyborg GFP was constructed from cpGFP by linking the β10 and β11 with oligo(ethylene glycol) using maleimide-cysteine couplings, followed by the enzymatic cleavage of the N- and C-termini linking loop by thrombin. With the help of machine learning, we were able to obtain the cpGFP mutants that significantly alter the fluorescence activity (53% increase) by thrombin treatment, which splits cpGFP into two fragments (fragmented-GFP), and by heat shock. When the cyborg GFP was constructed using this mutant, the fluorescence intensity increased by 13% after heat treatment, similar to cpGFP (33% increase), and the behavior was significantly different from that of the fragmented-GFP. This result suggests the possibility that the oligo(ethylene glycol) chain in the cyborg protein plays a similar role to the peptide in the main chain of the protein.","PeriodicalId":9511,"journal":{"name":"Bulletin of the Chemical Society of Japan","volume":"37 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186104","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

Purification and Tailored Functionalities in Detonation Nanodiamond 引爆纳米金刚石的纯化和定制功能

IF 4 3区化学

Bulletin of the Chemical Society of Japan Pub Date : 2024-08-24 DOI: 10.1093/bulcsj/uoae089

Lutfia Isna Ardhayanti, Islam Md Saidul, Ze Cai, Masahiro Fukuzaki, Xinyao Liu, Zhongyue Zhang, Yoshihiro Sekine, Shinya Hayami

{"title":"Purification and Tailored Functionalities in Detonation Nanodiamond","authors":"Lutfia Isna Ardhayanti, Islam Md Saidul, Ze Cai, Masahiro Fukuzaki, Xinyao Liu, Zhongyue Zhang, Yoshihiro Sekine, Shinya Hayami","doi":"10.1093/bulcsj/uoae089","DOIUrl":"https://doi.org/10.1093/bulcsj/uoae089","url":null,"abstract":"Nanodiamonds (NDs) offer immense potential in various fields, but graphitic or metal-based impurities hinder their widespread adoption. Conventional purification methods often employ harsh chemicals or high temperatures, raising concerns about ND integrity and surface properties. Herein, we compared various strategies to purify and tailor the surface functional groups in the detonation-derived nanodiamonds. A facile two-step purification strategy combining salt-assisted air oxidation (SAAO) and Fenton chemistry is particularly interesting for efficient and selective removal of graphitic impurities while preserving the diamond lattice structure. SAAO selectively burns off graphitic impurities at 450 °C under controlled oxygen flow, minimizing damage to the diamond core. Subsequently, Fenton's reagent (H2O2/Fe2+) introduces hydrophilic functional groups onto the ND surface, further enhancing diamond purity and promoting subsequent functionalization. This synergistic approach enables i) highly efficient removal of graphitic impurities while preserving ND morphology and crystal structure, ii) controlled introduction of surface functionalities, and iii) improved colloidal stability of purified NDs. This green and efficient purification protocol is beneficial for tailoring ND properties and unlocking their full potential in diverse applications ranging from biomedicine and electronics to catalysis and quantum technologies.","PeriodicalId":9511,"journal":{"name":"Bulletin of the Chemical Society of Japan","volume":"69 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186106","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

Optical manipulation of graphene oxide nanosheets toward arbitrary hetero-stacking of graphene and niobate and titanate nanosheets 对氧化石墨烯纳米片进行光学操纵，实现石墨烯与铌酸盐和钛酸盐纳米片的任意异质堆叠

IF 4 3区化学

Bulletin of the Chemical Society of Japan Pub Date : 2024-08-24 DOI: 10.1093/bulcsj/uoae086

Yasutaka Suzuki, Akira Ikeda, Shuji Nakao, Teruyuki Nakato, Kanji Saito, Jun Kawamata

引用次数: 0

Heterogenous Dynamics of Diffusive Motion in Organic Ionic Plastic Crystal Studied Using Spin-Spin Relaxation Time: N, N-Diethylpyrrolidinium Bis(fluorosulfonyl)amide 利用自旋-自旋弛豫时间研究有机离子塑料晶体中扩散运动的异质动力学：N, N-二乙基吡咯烷双（氟磺酰）酰胺

IF 4 3区化学

Bulletin of the Chemical Society of Japan Pub Date : 2024-08-19 DOI: 10.1093/bulcsj/uoae088

Keiko Nishikawa, Kozo Fujii, Kazuhiko Matsumoto, Hiroshi Abe, Masahiro Yoshizawa-Fujita

{"title":"Heterogenous Dynamics of Diffusive Motion in Organic Ionic Plastic Crystal Studied Using Spin-Spin Relaxation Time: N, N-Diethylpyrrolidinium Bis(fluorosulfonyl)amide","authors":"Keiko Nishikawa, Kozo Fujii, Kazuhiko Matsumoto, Hiroshi Abe, Masahiro Yoshizawa-Fujita","doi":"10.1093/bulcsj/uoae088","DOIUrl":"https://doi.org/10.1093/bulcsj/uoae088","url":null,"abstract":"The temperature dependences of the spin–spin relaxation times (T2) of 1H and 19F nuclei were measured for N, N-diethylpyrrolidinium bis(fluorosulfonyl)amide with a plastic crystal (PC) phase. In the PC phase, two types of T2 were observed in both 1H and 19F experiments, which was considered to be the appearance of heterogeneous dynamics of diffusive motion. By examining temperature dependences of the T2 values and the existence ratios, the following conclusions were reached. (1) The prepared PC sample was in a polycrystalline state, and each crystallite comprised two phases: the core phase (PC phase) and the surface phase formed to relieve surface stress. (2) The 1H-T2 (19F-T2) values of the two phases differed, and ions in the surface phase were more mobile. The 1H-T2 (19F-T2) values for the two phases increased with temperature rise. In particular, the 1H-T2 (19F-T2) values of the surface phase were smoothly connected to the liquid T2 values. (3) The cations and anions exhibited a cooperative diffusive motion. (4) When the temperature was considerably lower than the melting point, the ratio of the surface phase did not significantly differ from when it first formed. However, it rapidly increased near the melting point and became liquid.","PeriodicalId":9511,"journal":{"name":"Bulletin of the Chemical Society of Japan","volume":"46 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186108","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

Structural Generation by Inverse Transformation Using Principal Component Analysis Enhances Conformational Sampling of 利用主成分分析法通过反变换生成结构增强了对

IF 4 3区化学

Bulletin of the Chemical Society of Japan Pub Date : 2024-08-16 DOI: 10.1093/bulcsj/uoae087

Rikuri Morita, Yasuteru Shigeta, Ryuhei Harada

{"title":"Structural Generation by Inverse Transformation Using Principal Component Analysis Enhances Conformational Sampling of","authors":"Rikuri Morita, Yasuteru Shigeta, Ryuhei Harada","doi":"10.1093/bulcsj/uoae087","DOIUrl":"https://doi.org/10.1093/bulcsj/uoae087","url":null,"abstract":"Molecular dynamics (MD) simulations are frequently used to elucidate the molecular mechanisms underlying protein behaviour. Based on a conformational search with MD simulations, protein structures rich in high-dimensional data can be quantitatively evaluated in free-energy landscapes (FELs). Generally, FELs are defined in low-dimensional subspaces spanned by reaction coordinates (RCs) to characterize biological functions. When calculating FELs of proteins, principal component analysis (PCA) is particularly useful for capturing large-amplitude motions via dimensionality reduction into low-dimensional subspaces. In this study, to efficiently calculate FELs, a simple and convenient method is proposed by accelerating conformational search in a PCA subspace, which is achieved by quick generation of protein configurations. Specifically, inverse transformation driven by PCA facilitates the quick generation of diverse protein configurations from arbitrary grids in a defined PCA subspace. In our conformational search, a set of newly generated configurations serves as initial structures for multiple MD simulations, enabling one to calculate FELs of proteins by building Markov state models from their multiple trajectories. In conclusion, the conformational search from protein configurations broadly distributed in a PCA subspace accelerates FEL calculations, which supports a comprehensive approach to understanding collective protein dynamics.","PeriodicalId":9511,"journal":{"name":"Bulletin of the Chemical Society of Japan","volume":"12 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186151","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

Development of organic photoreactions utilizing the characteristics of elements with low electronegativity 利用低电负性元素的特性发展有机光反应

IF 4 3区化学

Bulletin of the Chemical Society of Japan Pub Date : 2024-08-07 DOI: 10.1093/bulcsj/uoae080

Yuki Nagashima

引用次数: 0

Imparting chiroptical property to achiral azobenzene derivative via incorporation into chiral-controlled helical nanofibers 通过将非手性偶氮苯衍生物纳入手性控制螺旋纳米纤维，赋予其气光特性

IF 4 3区化学

Bulletin of the Chemical Society of Japan Pub Date : 2024-07-29 DOI: 10.1093/bulcsj/uoae075

Tomoki Ito, Makoto Nakagawa, Takeshi Kawai

{"title":"Imparting chiroptical property to achiral azobenzene derivative via incorporation into chiral-controlled helical nanofibers","authors":"Tomoki Ito, Makoto Nakagawa, Takeshi Kawai","doi":"10.1093/bulcsj/uoae075","DOIUrl":"https://doi.org/10.1093/bulcsj/uoae075","url":null,"abstract":"Chiral transcription from chiral to achiral organic molecules is a fundamental research area in supramolecular chemistry, organic chemistry, and nanoscience. In this study, we demonstrated that chiral transcription of an achiral azobenzene derivative (Azo) can be achieved by embedding it within helically controlled nanofibers. Helical nanofibers were produced via supramolecular assembly of water-insoluble D-12-hydroxystearic acid (D-HSA) as a chiral source and a water-soluble long-chain amidoamine derivative (C18AA) in water. Azo-incorporated helical nanofibers exhibited a circular dichroism (CD) peak at 350 nm, which was assigned to the π−π* transition band of trans-azobenzene chromophore, suggesting a chiral arrangement of Azo molecules in the nanofibers. Because the nanofibers are dispersed in water and Azo is not soluble in water, the selection of an organic solvent to dissolve Azo is important for the incorporation of Azo molecules. When water-immiscible toluene was used as the solvent, Azo incorporation did not occur, because contact between the nanofibers and Azo was inhibited; however, when water-miscible methanol was used, incorporation was achieved. The incorporation of Azo gradually occurred in the pre-assembled C18AA + D-HSA nanofibers, but co-assembly did not occur during the formation of the C18AA + D-HSA nanofibers. We also showed that Azo-containing nanofibers can undergo a reversible thermal phase transition between gel-to-sol states, switching the CD signal of Azo on and off. Furthermore, trans–cis-photoisomerization of Azo embedded in the nanofibers eliminated the CD peak of the trans-isomer, and no new CD peak corresponding to the cis-isomer appeared.","PeriodicalId":9511,"journal":{"name":"Bulletin of the Chemical Society of Japan","volume":"20 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869240","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