After subjecting a hydrofluoric acid treated and annealed TiO2(110) single-crystal substrate to immersion in an ethanol solution of aniline, a uniform step structure in the [001] direction was observed on the TiO2(110) surface without aniline. Since this finding is considered to control of the step direction on the TiO2(110) surface, the formed surface was discussed in detail and a model of the step line formation process was proposed. After immersing of TiO2(110) single-crystal substrate in an ethanol solution containing aniline, a uniform step structure in the [001] direction formed on the TiO2(110) surface although aniline was not existed. A reasonable model of the step line formation process was proposed. The present results lead to the novel method to control of the step direction on the TiO2(110) surface.
{"title":"Etching of TiO<sub>2</sub>(110) Single-Crystal Surface with Aniline for Step Direction Control","authors":"Mami Takahari, Taiga Goto, Soichiro Yoshimoto, Toshihiro Kondo","doi":"10.1246/cl.230334","DOIUrl":"https://doi.org/10.1246/cl.230334","url":null,"abstract":"After subjecting a hydrofluoric acid treated and annealed TiO2(110) single-crystal substrate to immersion in an ethanol solution of aniline, a uniform step structure in the [001] direction was observed on the TiO2(110) surface without aniline. Since this finding is considered to control of the step direction on the TiO2(110) surface, the formed surface was discussed in detail and a model of the step line formation process was proposed. After immersing of TiO2(110) single-crystal substrate in an ethanol solution containing aniline, a uniform step structure in the [001] direction formed on the TiO2(110) surface although aniline was not existed. A reasonable model of the step line formation process was proposed. The present results lead to the novel method to control of the step direction on the TiO2(110) surface.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135477192","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}
Hainan Sun, Yingying Wang, Xiangan Meng, Manman Hu, Xin Yan
{"title":"Unraveling the Interactions between Nanoparticles and Benzo[a]pyrene in Environmental Waters and Human Blood by Dissipative Particle Dynamics Simulations","authors":"Hainan Sun, Yingying Wang, Xiangan Meng, Manman Hu, Xin Yan","doi":"10.1246/cl.230337","DOIUrl":"https://doi.org/10.1246/cl.230337","url":null,"abstract":"","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"332 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136010428","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}
Thermal stability plays a crucial role in determining the polymer suitability as high-performance thermoresistant materials, which are highly demanded for lightweight substitute to metal or ceramic materials in a sustainable society. We here present an innovative approach involving the in-situ substitution of imidazole protons of polybenzimidazole (PBI) derivatives with deuterium using deuterated solvents to enhance thermal stability. The resulting substituted polymers exhibited significantly higher thermal decomposition temperatures compared to their original counterparts. This notable improvement can be attributed to the N-D bond, which possesses a low stretching frequency, demanding a greater amount of activating energy compared to the N-H bond, enabling the polymer to withstand higher temperatures. This discovery presents a novel and promising avenue for enhancing polymer thermoresistance, providing valuable insights for the development of advanced materials with enhanced thermal stability. Pinpoint surgery through in situ isotopic proton-deuterium substitution significantly enhanced the thermal degradation temperature of polybenzoxazoles, this is because N-D bond exhibit a lower stretching frequency than N-H, demanding more activating energy and thus can withstand higher temperature. This discovery provides a novel and straightforward method to elevate thermostability for polymers.
{"title":"Pin-point surgery of proton-deuterium substitution to enhance polybenzimidazole thermoresistances","authors":"Xianzhu Zhong, Aniruddha Nag, Jiabei Zhou, Kenji Takada, Motoyuki Kusano, Tatsuo Kaneko","doi":"10.1246/cl.230315","DOIUrl":"https://doi.org/10.1246/cl.230315","url":null,"abstract":"Thermal stability plays a crucial role in determining the polymer suitability as high-performance thermoresistant materials, which are highly demanded for lightweight substitute to metal or ceramic materials in a sustainable society. We here present an innovative approach involving the in-situ substitution of imidazole protons of polybenzimidazole (PBI) derivatives with deuterium using deuterated solvents to enhance thermal stability. The resulting substituted polymers exhibited significantly higher thermal decomposition temperatures compared to their original counterparts. This notable improvement can be attributed to the N-D bond, which possesses a low stretching frequency, demanding a greater amount of activating energy compared to the N-H bond, enabling the polymer to withstand higher temperatures. This discovery presents a novel and promising avenue for enhancing polymer thermoresistance, providing valuable insights for the development of advanced materials with enhanced thermal stability. Pinpoint surgery through in situ isotopic proton-deuterium substitution significantly enhanced the thermal degradation temperature of polybenzoxazoles, this is because N-D bond exhibit a lower stretching frequency than N-H, demanding more activating energy and thus can withstand higher temperature. This discovery provides a novel and straightforward method to elevate thermostability for polymers.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136010427","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}
{"title":"Structure Identification of Dynamic Zinc(II)-Ligand Assemblies in Solution Based on Ligand Chirality","authors":"Daiji Ogata, Junpei Yuasa","doi":"10.1246/cl.230353","DOIUrl":"https://doi.org/10.1246/cl.230353","url":null,"abstract":"","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"203 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135354293","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}
The Scholl reactions of di(1-anthryl) ketones were performed with chloranil under an acidic condition. The reaction of the parent ketone gave a cyclized product containing a seven-membered ring, which was enantiomerically separable. In contrast, the reaction of 4-(mesityloxy)-1-anthryl derivative mainly afforded an unexpected polycyclic aromatic ketone consisting of eight six-membered rings via skeletal rearrangement. The structure and properties of these products and the reaction mechanism are reported. Two di(1-anthryl) ketones gave different dehydrocyclization products upon treatment with chloranil. In particular, the (2,4,6-trimethylphenyl)oxy substituted derivative produced a novel aromatic ketone via unexpected skeletal rearrangement. This result is in contrast to that of the substituent free derivative, which formed a simple cyclization product with a helical structure.
{"title":"Formation of Novel Polycyclic Aromatic Compounds by Scholl Reactions of Di(1-anthryl) Ketones via Cyclization and Rearrangement","authors":"Shinji Toyota, Hiroshi Sekikawa, Hiroki Fukuda, Hiroshi Ikeda, Eiji Tsurumaki","doi":"10.1246/cl.230340","DOIUrl":"https://doi.org/10.1246/cl.230340","url":null,"abstract":"The Scholl reactions of di(1-anthryl) ketones were performed with chloranil under an acidic condition. The reaction of the parent ketone gave a cyclized product containing a seven-membered ring, which was enantiomerically separable. In contrast, the reaction of 4-(mesityloxy)-1-anthryl derivative mainly afforded an unexpected polycyclic aromatic ketone consisting of eight six-membered rings via skeletal rearrangement. The structure and properties of these products and the reaction mechanism are reported. Two di(1-anthryl) ketones gave different dehydrocyclization products upon treatment with chloranil. In particular, the (2,4,6-trimethylphenyl)oxy substituted derivative produced a novel aromatic ketone via unexpected skeletal rearrangement. This result is in contrast to that of the substituent free derivative, which formed a simple cyclization product with a helical structure.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135824872","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}
Based on the self-assembling amphiphilic peptide GAVILRR, we developed a peptide amphiphile bearing octanoyl and octaarginine groups that formed stable nanoparticles with siRNA delivery capabilities. The N-terminal addition of an octanoyl group reduced the particle size and polydispersity. The C-terminal polyarginine extension allowed the formation of nanoparticles with greater stability and smaller sizes with siRNA loading compared to those for the original and other variant peptides. The resulting peptide amphiphile PA8 effectively delivered siRNA into AsPC-1 pancreatic cancer cells. We developed a peptide amphiphile (PA) consisting of a hydrophobic alkyl chain, a hydrophobic GAVIL peptide, and a hydrophilic polyarginine. The existence of an alkyl chain promoted the self-assembly of PA to form nanoparticles. To the surface of nanoparticles, siRNA could be attached, producing positively charged nanocomplexes that effectively internalize into cancer cells.
{"title":"Self-assembly of Peptide Amphiphiles with Alkyl Groups for siRNA Delivery","authors":"Taufik F.N. Hakim, Kazunori Watanabe, Shomu Fujimoto, Mizuki Kitamatsu, Takashi Ohtsuki","doi":"10.1246/cl.230302","DOIUrl":"https://doi.org/10.1246/cl.230302","url":null,"abstract":"Based on the self-assembling amphiphilic peptide GAVILRR, we developed a peptide amphiphile bearing octanoyl and octaarginine groups that formed stable nanoparticles with siRNA delivery capabilities. The N-terminal addition of an octanoyl group reduced the particle size and polydispersity. The C-terminal polyarginine extension allowed the formation of nanoparticles with greater stability and smaller sizes with siRNA loading compared to those for the original and other variant peptides. The resulting peptide amphiphile PA8 effectively delivered siRNA into AsPC-1 pancreatic cancer cells. We developed a peptide amphiphile (PA) consisting of a hydrophobic alkyl chain, a hydrophobic GAVIL peptide, and a hydrophilic polyarginine. The existence of an alkyl chain promoted the self-assembly of PA to form nanoparticles. To the surface of nanoparticles, siRNA could be attached, producing positively charged nanocomplexes that effectively internalize into cancer cells.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135824873","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}
Kehan Cheng, Ken-ichi Shinohara, Koichi Higashimine, M. Teraguchi, T. Kaneko, T. Aoki
{"title":"Synthesis of two-dimensional multi-functional macromonomer and oxygen permselectivity of its supramolecular and covalent polymer membranes","authors":"Kehan Cheng, Ken-ichi Shinohara, Koichi Higashimine, M. Teraguchi, T. Kaneko, T. Aoki","doi":"10.1246/cl.230341","DOIUrl":"https://doi.org/10.1246/cl.230341","url":null,"abstract":"","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44173098","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}
{"title":"Copper-mediated Trifluoromethylthiolation of Alkenyl Iodides with AgSCF3","authors":"Yuki Kojima, K. Hirano","doi":"10.1246/cl.230335","DOIUrl":"https://doi.org/10.1246/cl.230335","url":null,"abstract":"","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42588475","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}
Hiro-Fumi Okabayashi, Sonoko Sasuga-Araki, Ken-Ichi Izawa, Charmian J. O’Connor
The one-dimensional aggregation theory was applied to the small angle neutron scattering (SANS) analyzed data of surfactant solutions. Plots of the hydrophobic bonding energy E to form an aggregate against the number-average aggregation number n were found to be powerful to estimate the compositional ratios of different aggregate species co-existing in a gross sample solution. One-dimensional aggregate theory was applied to the SANS-analyzed data of micelle solutions. Plots of the hydrophobic bonding energy E (E1, E2 and E3) to form a micelle against the number-average aggregation number n were found to provide the compositional ratios (XI, XII and XIII) of three micelle species (I, II and III) co-existing in a gross sample.
{"title":"Estimation of the Compositional Proportions of Different Micelle Species in Water: Application of One-dimensional Aggregate Theory to Small Angle Neutron Scattering Analyzed Data","authors":"Hiro-Fumi Okabayashi, Sonoko Sasuga-Araki, Ken-Ichi Izawa, Charmian J. O’Connor","doi":"10.1246/cl.230203","DOIUrl":"https://doi.org/10.1246/cl.230203","url":null,"abstract":"The one-dimensional aggregation theory was applied to the small angle neutron scattering (SANS) analyzed data of surfactant solutions. Plots of the hydrophobic bonding energy E to form an aggregate against the number-average aggregation number n were found to be powerful to estimate the compositional ratios of different aggregate species co-existing in a gross sample solution. One-dimensional aggregate theory was applied to the SANS-analyzed data of micelle solutions. Plots of the hydrophobic bonding energy E (E1, E2 and E3) to form a micelle against the number-average aggregation number n were found to provide the compositional ratios (XI, XII and XIII) of three micelle species (I, II and III) co-existing in a gross sample.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135364424","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}
Mizuki Tanaka, Hinano Yamaguchi, M. Kondo, M. Sakamoto, T. Sasaki, Hiroshi Ono, N. Kawatsuki
{"title":"Polarized Fluorescence of N-Salicylideneaniline Derivatives by Direct Exchange from Photoaligned N-Benzylideneaniline Side Groups in Liquid Crystalline Polymeric Films","authors":"Mizuki Tanaka, Hinano Yamaguchi, M. Kondo, M. Sakamoto, T. Sasaki, Hiroshi Ono, N. Kawatsuki","doi":"10.1246/cl.230317","DOIUrl":"https://doi.org/10.1246/cl.230317","url":null,"abstract":"","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48660197","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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