Abstract 1,2-Bis((cholesteryloxy)octyloxy)-4-nitrobenzene was synthesized as a chiral dopant that exhibited electroresponsiveness in nematic liquid crystal (LC) phases. Even in a nonelectroresponsive host nematic LC, the helical pitch of the chiral nematic phase, generated by doping the chiral dopant molecules, could be altered in response to an external electric field, thus controlling the selective reflection color.
{"title":"Structural color control by remote electrical manipulation of chiral dopant molecules in a chiral nematic phase","authors":"Keiki Kishikawa, Daiki Fukuda, Kazuto Takayashiki, Michinari Kohri","doi":"10.1093/chemle/upae098","DOIUrl":"https://doi.org/10.1093/chemle/upae098","url":null,"abstract":"<jats:title>Abstract</jats:title> 1,2-Bis((cholesteryloxy)octyloxy)-4-nitrobenzene was synthesized as a chiral dopant that exhibited electroresponsiveness in nematic liquid crystal (LC) phases. Even in a nonelectroresponsive host nematic LC, the helical pitch of the chiral nematic phase, generated by doping the chiral dopant molecules, could be altered in response to an external electric field, thus controlling the selective reflection color.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"70 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141257164","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}
Abstract A very powerful organic structure-directing agent (OSDA) for the synthesis of MSE-type zeolite was designed and successfully prepared. When using conventional OSDA, more than 10 d of crystallization time was necessary, whereas the use of the new type of OSDA gave a highly crystalline MSE-type zeolite using only 32 h of crystallization time.
{"title":"Remarkably facilitated crystallization of MSE-type zeolite by using an efficient organic structure-directing agent","authors":"Kaisei Nakamura, Kai Okubo, Fumiya Takaoka, Shengxiang Zhang, Satoshi Inagaki, Yoshihiro Kubota","doi":"10.1093/chemle/upae077","DOIUrl":"https://doi.org/10.1093/chemle/upae077","url":null,"abstract":"<jats:title>Abstract</jats:title> A very powerful organic structure-directing agent (OSDA) for the synthesis of MSE-type zeolite was designed and successfully prepared. When using conventional OSDA, more than 10 d of crystallization time was necessary, whereas the use of the new type of OSDA gave a highly crystalline MSE-type zeolite using only 32 h of crystallization time.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"59 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141255163","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}
Abstract Self-assembled hyaluronic acid (HA) microspheres are utilized for memorable optical humidity sensing. Because of the extremely high hygroscopic property of HA, the microsphere deforms in a highly humid atmosphere and the shape change is irreversible, thereby memorizing the history of the humidity change. The optically memorable humidity sensor can notify whether the humidity exceeds the upper limit of 50%.
{"title":"Hyaluronic acid microresonators for memorable humidity sensing","authors":"Hsin-Yen Liao, Wey Yih Heah, Hiroshi Yamagishi, Yohei Yamamoto","doi":"10.1093/chemle/upae078","DOIUrl":"https://doi.org/10.1093/chemle/upae078","url":null,"abstract":"<jats:title>Abstract</jats:title> Self-assembled hyaluronic acid (HA) microspheres are utilized for memorable optical humidity sensing. Because of the extremely high hygroscopic property of HA, the microsphere deforms in a highly humid atmosphere and the shape change is irreversible, thereby memorizing the history of the humidity change. The optically memorable humidity sensor can notify whether the humidity exceeds the upper limit of 50%.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"22 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141255319","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}
Abstract Triphylite structure NaMnPO4 is expected to be an excellent candidate as the positive active material of a Na-ion battery. However, NaMnPO4 tends to generate a maricite phase that does not have a valid sodium-ion conduction path. Thus, it undergoes several complex reaction steps, such as ion exchange, to obtain the triphylite phase to have an effective sodium-ion conduction path. This study provides an effective direct synthesis method for triphylite NaMnPO4 through an acid–base reaction in aqueous solution under mild conditions.
{"title":"Effective synthesis of triphylite NaMnPO4 through acid–base reaction in aqueous solution","authors":"Hiroshi Nagata, Junji Akimoto, Kunimitsu Kataoka","doi":"10.1093/chemle/upae051","DOIUrl":"https://doi.org/10.1093/chemle/upae051","url":null,"abstract":"<jats:title>Abstract</jats:title> Triphylite structure NaMnPO4 is expected to be an excellent candidate as the positive active material of a Na-ion battery. However, NaMnPO4 tends to generate a maricite phase that does not have a valid sodium-ion conduction path. Thus, it undergoes several complex reaction steps, such as ion exchange, to obtain the triphylite phase to have an effective sodium-ion conduction path. This study provides an effective direct synthesis method for triphylite NaMnPO4 through an acid–base reaction in aqueous solution under mild conditions.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"43 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141255164","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}
Abstract N-oxide poly(1-vinylimidazole) (PVIm+–O−) has been synthesized as a unique biocompatible polyampholyte. Measurements of solution turbidity prove that PVIm+–O− had no significant effect on rapid aggregate formation with serum proteins. Agarose gel retardation assay, particle size/ζ-potential measurement, and cytotoxicity evaluation prove that the PVIm+–O− coated binary complexes between branched poly(ethyleneimine) (bPEI) and plasmid DNA (pDNA). The resulting PVIm+–O−/bPEI/pDNA ternary complex mediated higher gene expression than the bPEI/pDNA binary complex in vivo mouse skeletal muscle. These results suggest that PVIm+–O− is a polyampholyte for biocompatibility.
{"title":"Synthesis of N-oxide Poly(1-vinylimidazole) for pDNA delivery systems in vivo","authors":"Ren Misaizu, Yoichi Negishi, Shoichiro Asayama","doi":"10.1093/chemle/upae044","DOIUrl":"https://doi.org/10.1093/chemle/upae044","url":null,"abstract":"<jats:title>Abstract</jats:title> N-oxide poly(1-vinylimidazole) (PVIm+–O−) has been synthesized as a unique biocompatible polyampholyte. Measurements of solution turbidity prove that PVIm+–O− had no significant effect on rapid aggregate formation with serum proteins. Agarose gel retardation assay, particle size/ζ-potential measurement, and cytotoxicity evaluation prove that the PVIm+–O− coated binary complexes between branched poly(ethyleneimine) (bPEI) and plasmid DNA (pDNA). The resulting PVIm+–O−/bPEI/pDNA ternary complex mediated higher gene expression than the bPEI/pDNA binary complex in vivo mouse skeletal muscle. These results suggest that PVIm+–O− is a polyampholyte for biocompatibility.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"28 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141255120","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}
Abstract The Zr metal–organic framework (MOF) UiO-66 was shaped into beads using chitosan and P3O105− as a cross-linker. The obtained UiO-66–chitosan beads showed decreases in pore size and Brunauer–Emmett–Teller (BET) surface area but enhanced N2 adsorption energy with retention of Zr-ligand connectivity. This finding will provide an important insight into the practical application of MOFs.
{"title":"Shaping of metal–organic framework using chitosan and triphosphate cross-linker","authors":"Aditya Irfan Witono, Xin Zheng, Yuki Saito, Shin-ichiro Noro","doi":"10.1093/chemle/upae050","DOIUrl":"https://doi.org/10.1093/chemle/upae050","url":null,"abstract":"<jats:title>Abstract</jats:title> The Zr metal–organic framework (MOF) UiO-66 was shaped into beads using chitosan and P3O105− as a cross-linker. The obtained UiO-66–chitosan beads showed decreases in pore size and Brunauer–Emmett–Teller (BET) surface area but enhanced N2 adsorption energy with retention of Zr-ligand connectivity. This finding will provide an important insight into the practical application of MOFs.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"20 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141255165","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}
Abstract Treatment of the bis-imidazole ligand, bitb, with CuSO4·5H2O, ZnSO4·7H2O, and Co(NO3)2·6H2O in the presence of NaN3 produced [Cu2(μ-N3)2(bitb)(N3)2]n (1), [Zn(bitb)(N3)2]n (2), and [(N3)2 ⊂ Co2(bitb)4(N3)2](Me2CO)2·(H2O)4 (3). Compound 1 is a 2D coordination polymer with {Cu2(μ-N3)2}n chains in the framework. Compound 2 is a 1D coordination polymer with repetitions of the “figure-of-eight-shaped” turns. Compound 3 is an M2L4 cage compound that includes 2 N3− in the cage. Their unprecedented coordination structures are described.
{"title":"Multinuclear coordination compounds constructed by bis-imidazole and azide ligands. Creation of new network structures and an M2L4 cage that includes two anions","authors":"Shiori Koike, Katsunori Yamanishi, Kanoko Watanabe, Hiroyuki Takemoto, Mitsuru Kondo","doi":"10.1093/chemle/upad044","DOIUrl":"https://doi.org/10.1093/chemle/upad044","url":null,"abstract":"<jats:title>Abstract</jats:title> Treatment of the bis-imidazole ligand, bitb, with CuSO4·5H2O, ZnSO4·7H2O, and Co(NO3)2·6H2O in the presence of NaN3 produced [Cu2(μ-N3)2(bitb)(N3)2]n (1), [Zn(bitb)(N3)2]n (2), and [(N3)2 ⊂ Co2(bitb)4(N3)2](Me2CO)2·(H2O)4 (3). Compound 1 is a 2D coordination polymer with {Cu2(μ-N3)2}n chains in the framework. Compound 2 is a 1D coordination polymer with repetitions of the “figure-of-eight-shaped” turns. Compound 3 is an M2L4 cage compound that includes 2 N3− in the cage. Their unprecedented coordination structures are described.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"37 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141255527","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}
Ryosuke Goto, Sou Taminato, Daisuke Mori, Nobuyuki Imanishi
Abstract A new antifluorite-structured Li5 + xFe1–xMnxO4 was synthesized by conventional solid-state reaction and the lithium (de-)intercalation properties were characterized from electrochemical measurements. A single phase with a Li6MnO4-type structure was obtained for the x ≥ 0.6 compositions. The first discharge capacity of a Li5.6Fe0.4Mn0.6O4 (x = 0.6) electrode treated by ball milling was 450 mAh/g. The reversible reaction continued to proceed with ca. 200 mAh/g after subsequent cycles. A new iron–manganese system with an antifluorite structure could be a potential candidate as a high-capacity cathode material.
{"title":"Synthesis and electrochemical properties of Li5 + xFe1–xMnxO4 with an antifluorite-type structure as a lithium battery cathode","authors":"Ryosuke Goto, Sou Taminato, Daisuke Mori, Nobuyuki Imanishi","doi":"10.1093/chemle/upae046","DOIUrl":"https://doi.org/10.1093/chemle/upae046","url":null,"abstract":"<jats:title>Abstract</jats:title> A new antifluorite-structured Li5 + xFe1–xMnxO4 was synthesized by conventional solid-state reaction and the lithium (de-)intercalation properties were characterized from electrochemical measurements. A single phase with a Li6MnO4-type structure was obtained for the x ≥ 0.6 compositions. The first discharge capacity of a Li5.6Fe0.4Mn0.6O4 (x = 0.6) electrode treated by ball milling was 450 mAh/g. The reversible reaction continued to proceed with ca. 200 mAh/g after subsequent cycles. A new iron–manganese system with an antifluorite structure could be a potential candidate as a high-capacity cathode material.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"18 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141255166","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}
Abstract A discarded-waste football was served as a carbon precursor to build O–N–S self-doped carbon quantum dots (CQDs) by a hydrothermal route. The CQDs have strong cyan luminescence, excellent stability, and their excitation is wavelength-dependent. The CQDs were acted as a fluorescent probe for the detection of Fe3+, exhibiting sensitivity and selectivity, which is of great significance for the effective monitoring of human health.
{"title":"Synthesis of O–N–S self-doped carbon quantum dots from a discarded football for Fe3+ detection","authors":"Jiangnian Shi","doi":"10.1093/chemle/upae064","DOIUrl":"https://doi.org/10.1093/chemle/upae064","url":null,"abstract":"<jats:title>Abstract</jats:title> A discarded-waste football was served as a carbon precursor to build O–N–S self-doped carbon quantum dots (CQDs) by a hydrothermal route. The CQDs have strong cyan luminescence, excellent stability, and their excitation is wavelength-dependent. The CQDs were acted as a fluorescent probe for the detection of Fe3+, exhibiting sensitivity and selectivity, which is of great significance for the effective monitoring of human health.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"16 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141255089","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}
Effects of enantioselective interactions on redox reactions of chiral molecules were studied using Au single crystal electrodes modified with amino acids. The redox peak current densities of R(+)- or S(–)-N, N-dimethyl-1-ferrocenylethylamine on Au(111) modified with L- or D-homocysteine (L-/D-Hcy) depended on the combination of these chiralities. Hcy/Au(100) showed no dependence on redox peak current densities. The difference in the molecular arrangement of Hcy between Au(111) and Au(100) greatly affects enantioselective redox reactions at the electrode interface.
{"title":"Dependence on the Crystallographic Orientation of Au Single Crystal Surfaces modified with Homocysteine toward Enantioselective Redox Reactions","authors":"Sayuki Oka, Masaru Kato, Soichiro Yoshimoto, Ichizo Yagi","doi":"10.1093/chemle/upad041","DOIUrl":"https://doi.org/10.1093/chemle/upad041","url":null,"abstract":"\u0000 Effects of enantioselective interactions on redox reactions of chiral molecules were studied using Au single crystal electrodes modified with amino acids. The redox peak current densities of R(+)- or S(–)-N, N-dimethyl-1-ferrocenylethylamine on Au(111) modified with L- or D-homocysteine (L-/D-Hcy) depended on the combination of these chiralities. Hcy/Au(100) showed no dependence on redox peak current densities. The difference in the molecular arrangement of Hcy between Au(111) and Au(100) greatly affects enantioselective redox reactions at the electrode interface.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"3 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139438381","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}
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