ACS Macro Letters最新文献_第2页

Diffusion of Nanosheets in Unentangled Polymer Melts

IF 5.8

ACS Macro Letters Pub Date : 2025-02-18 DOI: 10.1021/acsmacrolett.4c00535

Shiwei Sun, Kai Zhang, Sai Xu, Xinghua Shi, Jiuling Wang

引用次数: 0

A Thienothiophene-Based Olefin-Linked Covalent Organic Framework for the Metal-Free Photocatalytic Oxidative Coupling of Amines 用于胺类无金属光催化氧化偶联的噻吩基烯烃连接共价有机框架

IF 5.8

ACS Macro Letters Pub Date : 2025-02-15 DOI: 10.1021/acsmacrolett.4c00847

Bertha Lotsi, Aadarsh Sharma, Jared G. Doremus, Spencer T. Burton, Claudia Turro, Psaras L. McGrier

{"title":"A Thienothiophene-Based Olefin-Linked Covalent Organic Framework for the Metal-Free Photocatalytic Oxidative Coupling of Amines","authors":"Bertha Lotsi, Aadarsh Sharma, Jared G. Doremus, Spencer T. Burton, Claudia Turro, Psaras L. McGrier","doi":"10.1021/acsmacrolett.4c00847","DOIUrl":"https://doi.org/10.1021/acsmacrolett.4c00847","url":null,"abstract":"The oxidative coupling of amines is a useful way to prepare many diverse compounds for the pharmaceutical and chemical industries. Covalent organic frameworks (COFs), a crystalline class of porous polymers, have emerged as promising heterogeneous photocatalysts that can accomplish this transformation under metal-free conditions due to their excellent photochemical stability and tunable electronic properties. Herein, we report the optoelectronic and photocatalytic properties of an olefin-linked COF containing thienothiophene (TT) and 2,4,6-trimethyl-1,3,5-triazine (TMT) units. The TT-TMT-COF exhibited a narrow band gap with extended light absorption and excellent charge separation, making it useful for the oxidative coupling of various benzylamines. The TT-TMT-COF exhibited fast reaction times, excellent recyclability, and conversions as high as ∼99%. The reactivity of TT-TMT-COF was on par or significantly better than that of a few small molecule 2,4,6-tris((E)-2-(thieno[3,2-b]thiophen-2-yl)vinyl)-1,3,5-triazine (TT-TMT) and 2,4,6-tris((E)-2-(thiophen-2-yl)vinyl)-1,3,5-triazine (Thio-TMT) homogeneous catalytic systems containing similar functional units. This work further highlights the ability of the COF to perform useful and efficient catalytic transformations in a sustainable manner.","PeriodicalId":18,"journal":{"name":"ACS Macro Letters","volume":"24 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143417990","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

Helical Poly(quioxaline-2,3-diyl)-Based Poly(carboxylic acid)s as a Chiroptical Chemosensor for Detection and Quantification of Small Enantiomeric Imbalances of Chiral Amines in Water. 螺旋状聚(喹喔啉-2,3-二基)聚(羧酸)作为千光化学传感器，用于检测和定量水中手性胺的微小对映异构体失衡。

IF 5.1

ACS Macro Letters Pub Date : 2025-02-14 DOI: 10.1021/acsmacrolett.4c00814

Tomonori Yamawaki, Takuma Kuroda, Takeshi Yamamoto, Yuuya Nagata, Michinori Suginome

{"title":"Helical Poly(quioxaline-2,3-diyl)-Based Poly(carboxylic acid)s as a Chiroptical Chemosensor for Detection and Quantification of Small Enantiomeric Imbalances of Chiral Amines in Water.","authors":"Tomonori Yamawaki, Takuma Kuroda, Takeshi Yamamoto, Yuuya Nagata, Michinori Suginome","doi":"10.1021/acsmacrolett.4c00814","DOIUrl":"https://doi.org/10.1021/acsmacrolett.4c00814","url":null,"abstract":"Achiral dynamic helical polymers, poly(quinoxaline-2,3-diyl)s (P1 and P2) bearing achiral carboxylic acid side chains, i.e., carboxymethoxymethyl (in P1) and carboxyethoxymethyl (in P2), with different polymerization degrees were synthesized. They exhibited induced circular dichroism (ICD) in the presence of chiral amines such as 1-phenylethylamine and nicotine, 1,2-amino alcohols such as valinol, leucinol, and prolinol, and the basic amino acid, arginine, in response to the induction of right- or left-handed helical conformation. The efficiency of helix induction depends on the compatibility of the structures of amines and polymers, with no clear structural correlation. The highly sensitive and formulated nature of ICD with the helical polymer-based poly(carboxylic acid)s allowed their use as CD-based sensors to detect and quantify minute imbalances of the enantiomeric excess of chiral molecules. We determined 0.2%-0.6% ee in the commercially available 1-phenylethylamine from three different suppliers, which have the label of \"dl\" or no indication of enantiopurity using P1 as a chemosensor.","PeriodicalId":18,"journal":{"name":"ACS Macro Letters","volume":" ","pages":"272-277"},"PeriodicalIF":5.1,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143412307","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

Scaling Behavior of Entanglement Dynamics in Polyelectrolyte Solutions: Insights from High-Frequency Rheometry

IF 5.8

ACS Macro Letters Pub Date : 2025-02-13 DOI: 10.1021/acsmacrolett.4c00722

Yahya Rharbi

{"title":"Scaling Behavior of Entanglement Dynamics in Polyelectrolyte Solutions: Insights from High-Frequency Rheometry","authors":"Yahya Rharbi","doi":"10.1021/acsmacrolett.4c00722","DOIUrl":"https://doi.org/10.1021/acsmacrolett.4c00722","url":null,"abstract":"Entanglement dynamics in polyelectrolyte solutions remain a challenging topic, particularly in capturing the entire dynamic spectrum, from single entanglement relaxation (τe) to reptation time (τrep), and aligning these observations with scaling predictions in the semidilute entangled (SE) and fully entangled (FE) neutral regimes. Using piezo compressional and classic rotational rheometry, we investigate the scaling behaviors of key viscoelastic properties over several decades of time scales in ten million Mw cationic polyacrylamide solutions. Specific viscosity (ηsp) and τrep scale as predicted within Fuoss, SE, and FE regimes, defining crossover concentrations between these regimes (Ce and CD). More importantly, τe, the rubbery plateau width (τrep/τe), and the high-frequency modulus (Ge) scale as C–1.14±0.02, C1.25±0.07, and C1.32±0.05, aligning with SE prediction in the early SE regime before transitioning to neutral scaling of C–2.7±0.14, C3.1±0.15, and C2.35±0.07 at an intermediate concentration between Ce and CD labeled CDe. These results indicate that electrostatic interactions affect single entanglements and reptation differently, leading to a transition to neutral behavior at CDe for the former and at CD for the latter.","PeriodicalId":18,"journal":{"name":"ACS Macro Letters","volume":"59 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402013","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

Retraction of “Temperature-Controlled Star-Shaped Cellulose Nanocrystal Assemblies Resulting from Asymmetric Polymer Grafting”

IF 5.8

ACS Macro Letters Pub Date : 2025-02-13 DOI: 10.1021/acsmacrolett.4c00787

Fangbo Lin, Fabrice Cousin, Jean-Luc Putaux, Bruno Jean

引用次数: 0

Pure Organic Thermally Activated Delayed Fluorescence Afterglow Polymers via Dopant Isomerization.

IF 5.1

ACS Macro Letters Pub Date : 2025-02-13 DOI: 10.1021/acsmacrolett.4c00818

Guanyu Liu, Zixin Yan, Qi Song, Qikun Sun, Shanfeng Xue, Wenjun Yang

{"title":"Pure Organic Thermally Activated Delayed Fluorescence Afterglow Polymers via Dopant Isomerization.","authors":"Guanyu Liu, Zixin Yan, Qi Song, Qikun Sun, Shanfeng Xue, Wenjun Yang","doi":"10.1021/acsmacrolett.4c00818","DOIUrl":"https://doi.org/10.1021/acsmacrolett.4c00818","url":null,"abstract":"N-(o-Cyanophenyl)carbazole can be dimerized at different positions, which may change excited state behaviors. Herein, 2,3'-dicyano-3,4'-di(carbazol-9-yl)biphenyl (D34C) is designed and synthesized and doped into polymers. However, we find that D34C does not exhibit room temperature phosphorescence but emits fluorescence (FL) and bright thermally activated delayed fluorescence (TADF) with lifetimes of hundreds of milliseconds, which is observed in diverse matrices such as PMMA, MBS, ABS, PS, HIPS, and SIS. The simple positional isomerization makes the abundant triplet excitons undergo only reverse intersystem crossing rather than room temperature phosphorescence (RTP) radiation, which is rather rare in organic doped polymers. Since the production of TADF afterglow requires a certain excitation time, the generally indistinguishable FL and TADF efficiencies are separated for the first time. This work not only provides novel TADF afterglow polymers with diverse mechanical properties but also will evoke the subtle design of conjugated organic molecules to dramatically change photoexcitation and emission behaviors.","PeriodicalId":18,"journal":{"name":"ACS Macro Letters","volume":" ","pages":"265-271"},"PeriodicalIF":5.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143412308","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

Autophagy-Activating Nanoautophagosome-Tethering Compounds for Targeted Protein Degradation Specifically in Tumor Cells

IF 5.8

ACS Macro Letters Pub Date : 2025-02-11 DOI: 10.1021/acsmacrolett.4c00789

Mengchen Xu, Jiajing Chen, Shuyu Wang, Linlin Xu, Xiaohui Wu, Jinpu Yu, Feihe Ma, Linqi Shi

{"title":"Autophagy-Activating Nanoautophagosome-Tethering Compounds for Targeted Protein Degradation Specifically in Tumor Cells","authors":"Mengchen Xu, Jiajing Chen, Shuyu Wang, Linlin Xu, Xiaohui Wu, Jinpu Yu, Feihe Ma, Linqi Shi","doi":"10.1021/acsmacrolett.4c00789","DOIUrl":"https://doi.org/10.1021/acsmacrolett.4c00789","url":null,"abstract":"Autophagosome-tethering compounds (ATTECs) represent an emerging targeted protein degradation (TPD) technology that directly draws intracellular proteins of interest (POIs) into autolysosomes. Although ATTECs are currently dominated by small molecules, the poor cell-type specificity and pharmacokinetic profile limit their applications in certain diseases. Moreover, the suboptimal intrinsic autophagic activity of cells affects the ATTECs-mediated degradation capability. Here we develop a nano-ATTEC system using our unique mixed-shell polymeric micelle (MSPM)-based nanoplatform for tumor-specific degradation of POIs. We demonstrate that the MSPMs-based nano-ATTEC is efficiently taken up by tumor cells in the acidic tumor microenvironment and to degrade POIs, rather than by normal cells under physiological conditions. More importantly, we find that this nano-ATTEC can not only target autolysosomes but also robustly enhance the autophagy activity, thereby establishing a positive feedback mechanism based on the autophagy pathway for efficient degradation of POIs. We believe that this MSPMs-based nano-ATTEC will find broad applications in tumor therapy.","PeriodicalId":18,"journal":{"name":"ACS Macro Letters","volume":"9 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143385600","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

High Carbon Recovery in Photocatalytic Degradation of High-Density Polyethylene (HDPE): Blend with Stearic Acid as a Radical Source

IF 5.8

ACS Macro Letters Pub Date : 2025-02-10 DOI: 10.1021/acsmacrolett.4c00726

Bin Lu, Kohei Takahashi, Kyoko Nozaki

引用次数: 0

Ultrafast Thermal RAFT Depolymerization at Higher Solid Contents

IF 5.8

ACS Macro Letters Pub Date : 2025-02-10 DOI: 10.1021/acsmacrolett.5c00009

Dimitra Mantzara, Richard Whitfield, Hyun Suk Wang, Nghia P. Truong, Athina Anastasaki

引用次数: 0

High Carbon Recovery in Photocatalytic Degradation of High-Density Polyethylene (HDPE): Blend with Stearic Acid as a Radical Source