Styrene underwent unprecedented coordination-insertion copolymerization with naked polar monomers (ortho-/meta-/para-methoxystyrene) in the presence of a pyridyl methylene fluorenyl yttrium catalyst. High activity (1.26×10 g mol h ) and excellent syndioselectivity were observed, and high-molecular-weight copolymers (24.6×10 g mol ) were obtained. The insertion rate of the polar monomers could be adjusted in the full range of 0-100 % simply by changing the loading of the polar styrene monomer. Strikingly, the copolymers had tapered, gradient, and even random sequence distributions, depending on the position of the polar methoxy group on the phenyl ring and thus on its mode of coordination to the active metal center, as shown by tracking the polymerization process and DFT calculations.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/anie.201611066 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Thiol-Ene Click Chemistry: A General Strategy for Tuning the Properties of Vinylene-Linked Covalent Organic Frameworks.
ACS Appl Mater Interfaces
January 2025
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Science, Beijing 100085, China.
Article Synopsis
- Vinylene-linked Covalent Organic Frameworks (V-2D-COFs) are advanced materials known for their stable, crystalline structures and excellent optoelectronic properties, but their synthesis is limited due to challenges with C═C bonds.
- Postsynthetic modification (PSM) offers a solution by allowing the introduction of functional groups into these frameworks, thus expanding their potential applications.
- The study demonstrates a thiol-ene click reaction to successfully modify two COFs, enhancing their properties and structural versatility, which could lead to new applications in areas like hydrophilicity and proton conductivity.
Endowing single-crystal polymers with circularly polarized luminescence.
Nat Commun
January 2025
Key Laboratory for Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China.
The preparation of single-crystal polymers with circularly polarized luminesce (CPL) remains a challenging task in chemistry and materials science. Herein, we present the single-crystal-to-single-crystal topochemical photopolymerization of a chiral organic salt to achieve this goal. The in-situ reaction of 1,4-bis((E)-2-(pyridin-4-yl)vinyl)benzene (1) with chiral (+)- or (-)-camphorsulfonic acid (CSA) gives the monomer crystal 1[( + )/( - )-CSA] showing yellow CPL with a high luminescent dissymmetry factor |g| of 0.
View Article and Find Full Text PDFSelf-Assembly of Homo Phenylalanine Oligopeptides: Role of Oligopeptide Chain Length.
Langmuir
January 2025
Biomimetic Materials and Tissue Engineering Laboratory, Department of Chemical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States.
The self-assembly of phenylalanine (F)-based peptides is a critical area of research with potential implications for the development of advanced biomaterials and technologies. Previous studies indicate that homo-oligopeptides with F-X residues (X = 1 to 6) can self-assemble into diverse nano-microstructures, but the role of oligopeptide chain length on this process remains unclear. This review investigates the role of F-X chain length on self-assembly processes and morphologies, considering the effect of incubation conditions and the capping group at the N and/or C terminals.
View Article and Find Full Text PDFRAFT Dispersion Polymerization of 2-Hydroxyethyl Methacrylate in Non-polar Media.
Macromolecules
December 2024
Dainton Building, Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, South Yorkshire S3 7HF, U.K.
We report the reversible addition-fragmentation chain transfer (RAFT) dispersion polymerization of 2-hydroxyethyl methacrylate (HEMA) in -dodecane using a poly(lauryl methacrylate) (PLMA) precursor at 90 °C. This formulation is an example of polymerization-induced self-assembly (PISA), which leads to the formation of a colloidal dispersion of spherical PLMA-PHEMA nanoparticles at 10-20% w/w solids. PISA syntheses involving polar monomers in non-polar media have been previously reported but this particular system offers some unexpected and interesting challenges in terms of both synthesis and characterization.
View Article and Find Full Text PDFMetabolic Reprograming of Macrophages: A New Direction in Traditional Chinese Medicine for Treating Liver Failure.
J Immunol Res
January 2025
Department of Infectious Diseases, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China.
Acute liver failure (ALF) is a fulminant clinical syndrome that usually leads to multiple organ failure and high mortality. Macrophages play a crucial role in the initiation, development, and recovery of ALF. Targeting macrophages through immunotherapy holds significant promise as a therapeutic strategy.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!