Article
Chemistry, Multidisciplinary
Alex E. Crolais, Neil D. Dolinski, Nicholas R. Boynton, Julia M. Radhakrishnan, Scott A. Snyder, Stuart J. Rowan
Summary: A new series of catalyst-free, room-temperature dynamic thia-Michael acceptors bearing an isoxazolone motif were developed and utilized to access both dynamic covalent networks and linear polymers. By leveraging the generation of aromaticity upon thiol addition and tuning the electronic-withdrawing/donating nature of the acceptor at two different sites, a wide range of equilibrium constants were obtained. Integration into a ditopic isoxazolone-based Michael acceptor allowed access to both bulk dynamic networks and linear polymers with tailored thermomechanical properties.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Joydeb Goura, James McQuade, Daisuke Shimoyama, Roger A. Lalancette, John B. Sheridan, Frieder Jakle
Summary: This study demonstrates new reactivity patterns at the bridgehead positions of a ruthenium tris(pyrid-2-yl)borate complex, allowing for easy tuning of its steric and electronic properties.
CHEMICAL COMMUNICATIONS
(2022)
Review
Biotechnology & Applied Microbiology
Priyank Purohit, Akanksha Bhatt, Ravi K. Mittal, Magda H. Abdellattif, Thoraya A. Farghaly
Summary: Polymer grafting is a technique to improve the morphology and properties of polymers. By creating copolymers or grafting, the physicochemical properties of polymers can be further modified. This review discusses various chemical approaches for polymer grafting, such as free radical reactions, click reactions, amide formation, and alkylation. The review also covers the importance of the graft-to approaches and their application in different fields.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2023)
Article
Polymer Science
Zhi Rong Ou, Wei Li Peng, Min Zhi Rong, Ming Qiu Zhang
Summary: A novel strategy utilizing reversible boronic ester bonds and imine bonds has been proposed for controllable depolymerization and recovery of polymer blends. Through the preparation of reversibly interlocked polymer networks (RILNs) from two preformed crosslinked polymers, a cascading effect between boronic ester bonds and imine bonds is enabled, allowing controlled depolymerization and recovery.
News Item
Multidisciplinary Sciences
Davide Castelvecchi, Heidi Ledford
Summary: Researchers have been honored for their game-changing methods in coupling molecules, including reactions that can take place in living cells.
Review
Polymer Science
Li-Han Rong, Eugene B. Caldona, Rigoberto C. Advincula
Summary: This review provides an overview of the fundamentals, applications, and future possibilities of photoinduced electron/energy transfer reversible addition-fragmentation chain transfer (PET-RAFT) polymerization. It highlights the compatibility of PET-RAFT with ambient conditions and green solvents, as well as its potential as an alternative to conventional RAFT techniques for producing well-defined polymers.
POLYMER INTERNATIONAL
(2023)
Article
Polymer Science
Patrick H. Maag, Florian Feist, Hendrik Frisch, Peter W. Roesky, Christopher Barner-Kowollik
Summary: Fluorescent and catalytically active single chain nanoparticle (SCNP) systems can visualize and trace the distribution of catalysts in a reaction system. This study presents a synthetic strategy to produce such SCNPs through a photoactivated reaction under visible light. The compaction of SCNPs is achieved by generating a fluorescent entity, demonstrating a successful reduction in the size of the nanoparticles.
Article
Chemistry, Inorganic & Nuclear
Sana Nayab, Vanessa Trouillet, Hartmut Gliemann, Peter G. Weidler, Iqra Azeem, Saadia R. Tariq, Anja S. Goldmann, Christopher Barner-Kowollik, Basit Yameen
Summary: This study presents multiple approaches for the tandem postsynthetic modification of various metal-organic frameworks, showcasing the use of dienophile and phosphoryl dithioester groups to achieve chemically switchable properties. Additionally, Michael addition reactions were utilized to introduce different molecules into the MOF lattice, expanding the functionality of the MOF materials.
INORGANIC CHEMISTRY
(2021)
Review
Chemistry, Multidisciplinary
Dominik Schauenburg, Tanja Weil
Summary: In vivo chemistry refers to chemical reactions taking place within living systems, such as cells, tissues, or the entire organism, while in vitro reactions occur in artificial environments outside living organisms, like test tubes. It is essential to understand which reactions can efficiently occur without producing by-products and how product formation can be characterized in complex living environments. In vivo chemistry offers potential applications in synthesizing drug molecules within cells and enhancing the understanding of living systems and therapeutic strategies. Two guiding principles in this field are identifying translatable chemical reactions from the laboratory to living systems and selecting suitable methods to study reactions and structure formation in complex living environments.
Article
Chemistry, Multidisciplinary
Hongbin Chen, Zhe Zhang, Peiran Wang, Yunxin Zhang, Kangqiao Ma, Yi Lin, Tainan Duan, Tengfei He, Zaifei Ma, Guankui Long, Chenxi Li, Bin Kan, Zhaoyang Yao, Xiangjian Wan, Yongsheng Chen
Summary: Compared to linear NFAs, multi-dimensional NFAs with extended conjugated structures in multiple directions show potential for improving absorption, molecular packing, and charge transport dynamics in organic solar cells. In this study, a conjugated-skeleton connection mode is developed, extending linear molecular structures towards three-dimensions. The resulting 3D NFAs exhibit low reorganization energy, fibrillar network film morphology, enhanced charge transport behavior, and improved stability. By optimizing the molecular geometry using fluorine-induced noncovalent conformational locks, a remarkable efficiency of 17.05% is achieved in binary bulk-heterojunction OSCs based on CH8-1, which represents the highest value for multi-dimensional acceptors to date. This work paves the way for further molecular structural optimization of state-of-the-art NFAs.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Qingquan Tang, Ke Zhang
Summary: This review discusses a polymer synthesis method based on a self-accelerating double-strain-promoted 1,3-dipole-alkyne cycloaddition (DSPDAC) click reaction, which can produce polymers with ultrahigh molecular weight. The method also demonstrates a stoichiometric imbalance-promoted step-growth polymerization approach and a unique bimolecular ring-closure method.
CHINESE JOURNAL OF CHEMISTRY
(2021)
Article
Biochemistry & Molecular Biology
Fatemeh Zare, Alessandro Potenza, Andrea A. Greschner, Marc A. Gauthier
Summary: Click and Clip reactions can be used to prepare bioconjugates, releasing original peptides and regenerating unmodified methionine residues in minutes. These reactions demonstrate substantial stability towards bacterial reactive species and are compatible with the preservation of biomolecules and fluorophores.
Article
Multidisciplinary Sciences
Kenji Ota, Kazunori Nagao, Dai Hata, Haruki Sugiyama, Yasutomo Segawa, Ryosuke Tokunoh, Tomohiro Seki, Naoya Miyamoto, Yusuke Sasaki, Hirohisa Ohmiya
Summary: This study demonstrates a light-driven radical-polar crossover mechanism for the tertiary alkylation of phosphorus atoms in nucleotides, enabling the synthesis of alkylphosphonate structures that are difficult to obtain using existing methods.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Shimon Kataoka, Ayuko Tsuruoka, Daisuke Aoki, Hideyuki Otsuka
Summary: Thermoresponsive polymers with rapid and reversible cross-linking under solvent-free conditions have been prepared via the dynamic exchange of Bis(hindered amino)disulfide (BiTEMPS) units. The cross-linking reaction through BiTEMPS units leads to enhanced toughness of the polymer, with the capability of structural transformation back to the original state. Various characterization techniques such as gel permeation chromatography, rheology, tensile tests, and swelling experiments were used to study the structural transformation and physical properties of the polymers.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Environmental Sciences
Christopher D. Holmes
Summary: The method of entrainment-limited kinetics allows for more accurate and efficient simulation of cloud chemistry reactions, particularly in bimolecular reactions. The numerical errors in this method are smaller when compared to other commonly used methods in simulating cloud chemistry.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)