ACS Macro Letters最新文献

Selective Ring-Opening Polymerization of Silyl Glycidyl Ether through Organocatalysis.

IF 5.1

ACS Macro Letters Pub Date : 2024-06-27 DOI: 10.1021/acsmacrolett.4c00356

Jie Pang, Tao Lai, Junpeng Zhao

引用次数: 0

Visible Light [2 + 2] Cycloadditions of Thermoresponsive Dendronized Styryltriazines To Exhibit Tunable Microconfinement.

IF 5.1

ACS Macro Letters Pub Date : 2024-06-27 DOI: 10.1021/acsmacrolett.4c00259

Sijie Zhou, Mengjie Zhang, Yue Yuan, Liangxuan Ren, Yuqiang Chen, Wen Li, Afang Zhang, Jiatao Yan

{"title":"Visible Light [2 + 2] Cycloadditions of Thermoresponsive Dendronized Styryltriazines To Exhibit Tunable Microconfinement.","authors":"Sijie Zhou, Mengjie Zhang, Yue Yuan, Liangxuan Ren, Yuqiang Chen, Wen Li, Afang Zhang, Jiatao Yan","doi":"10.1021/acsmacrolett.4c00259","DOIUrl":"https://doi.org/10.1021/acsmacrolett.4c00259","url":null,"abstract":"Visible light-triggered photochemical reactions in aqueous media are highly valuable to tailor molecular structures and properties in an ecofriendly manner. Here we report visible light-induced catalyst-free [2 + 2] cycloadditions of thermoresponsive dendronized styryltriazines, which show tunable microconfinement to guest dyes in aqueous media. These dendronized styryltriazines are constituted of conjugated mono- or tristyryltriazines, which carry hydrophilic dendritic oligoethylene glycol (OEG) pendants. They underwent efficient [2 + 2] cycloadditions to form dendronized cyclobutane dimers or oligomers in water through irradiation with visible light of 400 nm, and their cycloaddition behavior was dominated by dendritic architectures and solvent conditions. Dendronization with dendritic OEGs also afforded them characteristic thermoresponsive properties with tunable phase transition temperatures in the range 36-65 °C, which can be further modulated through photocycloaddition of styryltriazine chromophores. Importantly, dendronized styryltriazines can form tunable microenvironments in aqueous media, which encapsulate hydrophobic solvatochromic Nile red to exhibit variable photophysical properties. The encapsulated guest dye can be simultaneously released through noninvasive visible light-induced [2 + 2] cycloaddition reactions.","PeriodicalId":18,"journal":{"name":"ACS Macro Letters","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141453614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microscopic Observation of the Anisotropy of the Johari-Goldstein-β Process in Cross-Linked Polybutadiene on Stretching by Time-Domain Interferometry. 通过时域干涉仪微观观察交联聚丁二烯拉伸过程中乔哈里-戈尔茨坦-β过程的各向异性

IF 5.1

ACS Macro Letters Pub Date : 2024-06-25 DOI: 10.1021/acsmacrolett.4c00274

Ryo Mashita, Makina Saito, Yoshitaka Yoda, Nobumoto Nagasawa, Yasumasa Bito, Tatsuya Kikuchi, Hiroyuki Kishimoto, Makoto Seto, Toshiji Kanaya

引用次数: 0

Diverse Approaches for the Difunctionalization of PPH Dendrimers, Precise Versus Stochastic: How Does this Influence Catalytic Performance? PPH 树枝状聚合物的不同官能化方法，精确与随机：这对催化性能有何影响？

IF 5.1

ACS Macro Letters Pub Date : 2024-06-25 DOI: 10.1021/acsmacrolett.4c00204

Massimo Petriccone, Régis Laurent, Anne-Marie Caminade, Rosa María Sebastián

{"title":"Diverse Approaches for the Difunctionalization of PPH Dendrimers, Precise Versus Stochastic: How Does this Influence Catalytic Performance?","authors":"Massimo Petriccone, Régis Laurent, Anne-Marie Caminade, Rosa María Sebastián","doi":"10.1021/acsmacrolett.4c00204","DOIUrl":"https://doi.org/10.1021/acsmacrolett.4c00204","url":null,"abstract":"Random difunctionalization of dendrimer surfaces, frequently employed in biological applications, provides the advantage of dual functional groups through a synthetic pathway that is simpler compared to precise difunctionalization. However, is the random difunctionalization as efficient as the precise difunctionalization on the surface of dendrimers? This question is unanswered to date because most dendrimer families face challenges in achieving precise functionalization. Polyphosphorhydrazone (PPH) dendrimers present a unique opportunity to obtain precise difunctionalization at each terminal branching point. The work concerning catalysis we report with PPH dendrimers, whether precisely or randomly functionalized, addresses this question. Across PPH dendrimers, from generations 1 to 3, precise functionalization consistently outperforms random functionalization in terms of efficiency. This finding introduces a novel concept in dendrimer science, emphasizing the superiority of precise over random functionalization methodologies. Introducing a groundbreaking concept in the field of dendrimers.","PeriodicalId":18,"journal":{"name":"ACS Macro Letters","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141448950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal-Sensitive Supramolecular Coordination Complex Formed by Orthogonal Metal Coordination and Host-Guest Interactions for an Electrical Thermometer. 通过正交金属配位和主客体相互作用形成的热敏性超分子配位复合物，用于电温度计。

IF 5.1

ACS Macro Letters Pub Date : 2024-06-24 DOI: 10.1021/acsmacrolett.4c00357

Miaomiao Yan, Yinglong Bao, Sen Li, Shenglong Liao, Shouchun Yin

{"title":"Thermal-Sensitive Supramolecular Coordination Complex Formed by Orthogonal Metal Coordination and Host-Guest Interactions for an Electrical Thermometer.","authors":"Miaomiao Yan, Yinglong Bao, Sen Li, Shenglong Liao, Shouchun Yin","doi":"10.1021/acsmacrolett.4c00357","DOIUrl":"https://doi.org/10.1021/acsmacrolett.4c00357","url":null,"abstract":"Supramolecular coordination complexes (SCCs) are popular for their structural diversity and functional adaptability, which make them suitable for a wide range of applications. Photophysical and mechanical performance of SCCs are the most attractive characteristics, yet their ionically conductive behavior and potential in electrical sensing have been rarely investigated. This study reports a well-designed SCC that integrates orthogonal metal coordination and host-guest interactions to achieve sensitive electrical thermal sensing. Owing to the thermodynamic nature of the host-guest interaction, the SCC encounters thermally induced disassembly, leading to significantly enhanced ion mobility and thus allowing for the precise detection of minor temperature variation. The SCC-based thermometer is then fabricated with the assistance of 3D printing and demonstrates good accuracy and reliability in monitoring human skin temperature and real-time temperature changes of mouse during the whole anesthesia and recovery process. Our findings provide an innovative strategy for developing electrical thermometers and expand the current application scope of SCCs in electrical sensing.","PeriodicalId":18,"journal":{"name":"ACS Macro Letters","volume":null,"pages":null},"PeriodicalIF":5.1,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141441701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Aqueous Keto-Polyethylene Dispersions from Catalytic Copolymerization of Ethylene and Carbon Monoxide in Water. 乙烯和一氧化碳在水中催化共聚产生的酮基聚乙烯水分散体。

IF 5.1

ACS Macro Letters Pub Date : 2024-06-24 DOI: 10.1021/acsmacrolett.4c00313

Maximilian Baur, Rosa Habé, Stefan Mecking

引用次数: 0

Spin-Active and Magnetic Polymers. 自旋活性和磁性聚合物。

IF 5.1

ACS Macro Letters Pub Date : 2024-06-21 DOI: 10.1021/acsmacrolett.4c00401

Bryan W Boudouris, Yongho Joo

引用次数: 0

Scaling Properties of Gelling Systems in Nonlinear Shear Experiments. 非线性剪切实验中胶凝系统的缩放特性

IF 5.8

ACS Macro Letters Pub Date : 2024-06-14 DOI: 10.1021/acsmacrolett.4c00121

Ameur Louhichi, Marie-Hélène Morel, Laurence Ramos, Amélie Banc

引用次数: 0

Asymmetry in Polymer-Solvent Interactions Yields Complex Thermoresponsive Behavior. 聚合物与溶剂相互作用的不对称性产生复杂的热致伸缩行为

IF 5.8

ACS Macro Letters Pub Date : 2024-06-14 DOI: 10.1021/acsmacrolett.4c00178

Satyen Dhamankar, Michael A Webb

{"title":"Asymmetry in Polymer-Solvent Interactions Yields Complex Thermoresponsive Behavior.","authors":"Satyen Dhamankar, Michael A Webb","doi":"10.1021/acsmacrolett.4c00178","DOIUrl":"https://doi.org/10.1021/acsmacrolett.4c00178","url":null,"abstract":"We introduce a lattice framework that incorporates elements of Flory-Huggins solution theory and the q-state Potts model to study the phase behavior of polymer solutions and single-chain conformational characteristics. Without empirically introducing temperature-dependent interaction parameters, standard Flory-Huggins theory describes systems that are either homogeneous across temperatures or exhibit upper critical solution temperatures. The proposed Flory-Huggins-Potts framework extends these capabilities by predicting lower critical solution temperatures, miscibility loops, and hourglass-shaped spinodal curves. We particularly show that including orientation-dependent interactions, specifically between monomer segments and solvent particles, is alone sufficient to observe such phase behavior. Signatures of emergent phase behavior are found in single-chain Monte Carlo simulations, which display heating- and cooling-induced coil-globule transitions linked to energy fluctuations. The framework also capably describes a range of experimental systems. Importantly, and by contrast to many prior theoretical approaches, the framework does not employ any temperature- or composition-dependent parameters. This work provides new insights regarding the microscopic physics that underpin complex thermoresponsive behavior in polymers.","PeriodicalId":18,"journal":{"name":"ACS Macro Letters","volume":null,"pages":null},"PeriodicalIF":5.8,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141315940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unexpected Stress Overshoot in Extensional Flow of Star Polymer Melts. 星形聚合物熔体延展流动中的意外应力过冲

IF 5.8

ACS Macro Letters Pub Date : 2024-06-11 DOI: 10.1021/acsmacrolett.4c00182

Yinrui Wang, Anika Goecke, Valerian Hirschberg, Yiming Zhong, Shuang Liu, Manfred Wilhelm, Qian Huang

引用次数: 0