Article
Polymer Science
Shota Yamasaki, Yuri Kamon, Linlin Xu, Akihito Hashidzume
Summary: Through copper(I)-catalyzed and Huisgen cycloaddition reactions, 1,2,3-triazole polymers with different substituents were successfully synthesized. The crystalline properties of the polymers were influenced by the permittivity of the solvent and the type of substituents used. Additionally, the polymers exhibited fluorescence behavior in DMF, with the fluorescence peak shifting based on the excitation wavelength.
Article
Chemistry, Multidisciplinary
Fei-Fei Wang, Jia-Hui Li, Hai-Yan Liu, Shu-Ping Deng, Ying-Ying Liu, Jian-Fang Ma
Summary: Three distinctive coordination polymers were solvothermally synthesized using a resorcin[4]arene ligand. Among them, compound 1 showed efficient and selective catalytic performance, and could be recycled with preservation of its catalytic capability and structural integrity.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Borja Cirera, Alexander Riss, Pingo Mutombo, Jose Urgel, Jose Santos, Marco Di Giovannantonio, Roland Widmer, Samuel Stolz, Qiang Sun, Max Bommert, Roman Fasel, Pavel Jelinek, Willi Auwarter, Nazario Martin, David Ecija
Summary: The design of organometallic complexes is crucial in modern organic chemistry and catalysis. On-surface synthesis has recently emerged as a disruptive method to design compounds and nanomaterials previously considered impossible. The activation of inner diacetylene moieties of a molecular precursor by copper surface adatoms has led to the formation of unprecedented organocopper metallacycles on Cu(111), paving the way for new avenues in organometallic compound engineering and polyyne chemistry on surfaces.
Article
Polymer Science
Han Byul Song, Nancy Sowan, Austin Baranek, Jasmine Sinha, Wayne D. Cook, Christopher N. Bowman
Summary: The present study utilized photoinitiated copper-catalyzed azide-alkyne cycloaddition (CuAAC) polymerization to create structurally diverse glassy polymer networks. By systematically altering the monomer backbone rigidity and the reactive functional group density, networks with varied mechanical properties and strengths were obtained. Incorporating flexible monomers and changing the reactive end groups resulted in improvements in elongation at break and tensile toughness in the polymer networks.
Correction
Chemistry, Inorganic & Nuclear
Firdaus Rahaman Gayen, Abdul Aziz Ali, Debashree Bora, Saptarshi Roy, Supriya Saha, Lakshi Saikia, Rajib Lochan Goswamee, Biswajit Saha
Summary: This study focuses on the synthesis and characterization of a ferrocene functionalized Schiff base containing Cu(II) complex, and demonstrates its catalytic activity in the azide alkyne cycloaddition reaction at parts-per-million levels.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Medicinal
Ryosuke Kori, Keigo Murakami, Yoshitake Nishiyama, Tatsuya Toma, Satoshi Yokoshima
Summary: The study reveals the mechanism of copper-mediated reaction for the formation of nitriles, involving iodoalkyne and iodotriazole as intermediates.
CHEMICAL & PHARMACEUTICAL BULLETIN
(2021)
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
Chemistry, Multidisciplinary
Arthi Ravi, Syed Zahid Hassan, Subhrajyoti Bhandary, Kana M. Sureshan
Summary: In this study, a rigid inositol-derived monomer functionalized with azide and alkyne was used for regiospecific and quantitative topochemical azide-alkyne cycloaddition (TAAC) polymerization in crystalline polymorphs. The study highlights the caution of overreliance on topochemical postulates for predicting reactivity at high temperatures.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Vignesh Athiyarath, Mithun C. Madhusudhanan, Sooraj Kunnikuruvan, Kana M. Sureshan
Summary: This study demonstrates a novel approach for tuning the secondary structure of a polymer in the solid-state using topochemical synthesis of a pseudoprotein. By utilizing TAAC polymerization, the pseudoprotein undergoes a structural transformation from beta-meander to alpha-helical form when dissolved in methanol. This work opens up new possibilities for controlling the secondary structure of proteins and polymers in the solid-state.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Analytical
Jinlong Fan, Weiwei Yang
Summary: Electrochemical DNA/aptamer biosensors based on target-induced conformational change of surface-anchored oligonucleotides have been developed. A simple approach for fabrication of DNA-conjugated electrochemical platform on screen-printed electrodes was demonstrated using copper-free strain-promoted azide-alkyne cycloaddition (SPAAC), showing high sensitivity and stability for detection of DNA and proteins.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Multidisciplinary
[Anonymous]
Summary: The research article discusses a topochemical reaction that results in the formation of polymorphs of triazolyl-linked polyinositol.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Organic
T. Moritz Weber, Joerg Pietruszka
Summary: Copper-catalyzed alkyne azide click chemistry (CuAAC) is important for drug development and biological materials labeling. A new tridentate Cu-ligand called TDETA was synthesized as a scalable and non-toxic alternative to HN3 and the previously used DTEA ligand. TDETA showed excellent solubility in organic solvents and aqueous solutions, outcompeted commercial ligands THPTA and TBTA for various azide and alkyne combinations using Cu(I) and Cu(II) species, and had a 80% recovery yield.
SYNTHESIS-STUTTGART
(2023)
Article
Chemistry, Multidisciplinary
Lacheng Liu, Alexander Timmer, Elena Kolodzeiski, Hong-Ying Gao, Harry Monig, Henning Klaasen, Xiangzhi Meng, Jindong Ren, Armido Studer, Saeed Amirjalayer, Harald Fuchs
Summary: This study reports the sequential N-H and C-H dehydrogenation of pyromellitic diimide (PMDI) on a Cu(111) surface through a combination of experimental and theoretical methods. The structural analysis at each reaction step is enabled by STM experiments and atomistic modeling, revealing conformational changes induced by PMDI reactions at the surface.
NANOSCALE ADVANCES
(2021)
Article
Chemistry, Applied
Shaik Syed Hussain, Kesavarao Sykam, Ramanuj Narayan, Pratyay Basak
Summary: Si-PUTs were prepared by azide-alkyne cycloaddition, showing excellent surface hydrophobicity and anti-corrosion properties. A simple modification of aminopropyl trimethoxy silane produced a dialkyne terminated monomer, while azide-terminated urethane monomers were synthesized using azidoethanol and common diisocyanates. The successful formation of Si-PUTs was confirmed by FTIR and XPS analysis, and their performance as corrosion resistive coatings was evaluated comprehensively.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Chemistry, Applied
Qing Huang, Jia-Jun Zhu, Ling Song, Ping Shang, Xuan-Feng Jiang
Summary: This study adopts a post-modification strategy to construct three CuI-modified covalent triazine frameworks with different micropores, and catalyzes the azide-alkyne cycloaddition reaction in an aqueous solution, showing high efficiency, excellent tolerance, and good recyclability.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
N. Maximilian Bojanowski, Aleksandra Vranic, Vincent Hahn, Pascal Rietz, Tobias Messer, Julian Brueckel, Christopher Barner-Kowollik, Eva Blasco, Stefan Braese, Martin Wegener
Summary: Recent studies have introduced a new generation of photoinitiators for 3D laser nanoprinting, replacing two-photon absorption with two-step absorption. This can now be achieved using inexpensive blue laser diodes instead of expensive femtosecond laser systems. Additionally, researchers are exploring alternative photoinitiators that can be excited by one-color two-step absorption and be de-excited by a different laser color.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jochen A. Kammerer, Florian Feist, Daniel Ryklin, Abhishek Sarkar, Christopher Barner-Kowollik, Rasmus R. Schroder
Summary: It is shown that the postfunctionalization of solid polymeric microspheres can produce fully and extensively functionalized materials instead of core-shell structures. The complete functionalization is exemplified by photochemically generated microspheres, which are subsequently converted into polyradical systems. By directly visualizing the chemical distribution inside the postfunctionalized microspheres using characteristic electron energy loss signals in transmission electron microscopy (TEM), this study pioneers characterization methods with high sensitivity and resolution for all-organic low-contrast soft-matter material structures. The successful combination of ultrasonic ultramicrotomy and electron energy loss spectroscopy (EELS) and electron spectroscopic imaging (ESI) in TEM opens up a new avenue for analyzing such structures.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Steven C. Gauci, Katharina Ehrmann, Marvin Gernhardt, Bryan Tuten, Eva Blasco, Hendrik Frisch, Vishakya Jayalatharachchi, James P. Blinco, Hannes A. Houck, Christopher Barner-Kowollik
Summary: A photoresist-based on a light-stabilized dynamic material driven by an out-of-equilibrium photo-Diels-Alder reaction is introduced for 3D laser lithography. By adjusting the laser intensity, the postprinting degradation ability can be tuned. The resist's ability to form stable networks that degrade in the dark is transformed into a tunable degradable 3D printing material platform.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Kai Mundsinger, Bryan T. Tuten, Lily Wang, Kira Neubauer, Christian Kropf, Megan L. O'Mara, Christopher Barner-Kowollik
Summary: We present a single-chain nanoparticle (SCNP) system that exhibits three times higher catalytic efficiency for the photooxidation of nonpolar alkenes compared to an equivalent concentration of small-molecule photosensitizer. The SCNP is constructed using poly(ethylene glycol) methyl ether methacrylate and glycidyl methacrylate, compacted through multifunctional thiol-epoxide ligation, and functionalized with Rose Bengal (RB). The confined RB within the SCNP achieves enhanced photocatalysis for nonpolar alkenes due to spatial proximity in the hydrophobic region.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Polymer Science
Cameron M. Cole, Susanna V. Kunz, Thomas Baumann, James P. Blinco, Prashant Sonar, Christopher Barner-Kowollik, Soniya D. Yambem
Summary: Thermally activated delayed fluorescent (TADF) emitters are the leading materials for efficient OLEDs. A simple OLED with fully solution-processed organic layers is introduced, where the TADF emissive layer is ink-jet printed. The self-hosted TADF polymer shows potential for flexible ink-jet printed OLEDs, enabling a more scalable fabrication process.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Liang Yang, Hongrong Hu, Alexander Scholz, Florian Feist, Gabriel Cadilha Marques, Steven Kraus, Niklas Maximilian Bojanowski, Eva Blasco, Christopher Barner-Kowollik, Jasmin Aghassi-Hagmann, Martin Wegener
Summary: The authors propose laser printing as a facile process for fabricating printed electronics with minimum feature sizes below 1μm and demonstrate functional diodes, memristors, and physically unclonable functions. Laser printing with different inks, for the semiconductor ZnO and the metals Pt and Ag, is introduced for fabricating printed functional electronic devices with minimum feature sizes below 1μm. The versatility of this approach is demonstrated by showing functional diodes, memristors, and a physically unclonable function.
NATURE COMMUNICATIONS
(2023)
Article
Polymer Science
Philipp Neidinger, Dominik Voll, Sarah L. Walden, Andreas-Neil Unterreiner, Christopher Barner-Kowollik
Summary: This paper introduces the 800 nm two-photon pulsed laser polymerization (PLP) and demonstrates its working principle through biological tissue. The reliability of 2P PLP in determining propagation rate coefficients is shown using the example of the free radical polymerization of methyl methacrylate (MMA) at frequencies ranging from 10 to 100 Hz.
Article
Chemistry, Multidisciplinary
Linh Duy Thai, Thiago R. Guimaraes, Lewis C. Chambers, Jochen A. Kammerer, Dmitri Golberg, Hatice Mutlu, Christopher Barner-Kowollik
Summary: This study investigates the impact of macromolecular architecture on the isomerization efficiency of main-chain-incorporated chromophores in both solution and solid state. It is found that branched architectures deliver the highest isomerization efficiency in the solid state, reaching up to 70% compared to solution. The macromolecular design principles established in this study can serve as a blueprint for enhancing the solid-state isomerization efficiency in other polymer systems.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Ishrath Mohamed Irshadeen, Vinh X. Truong, Hendrik Frisch, Christopher Barner-Kowollik
Summary: By observing the changes in absorptivity of two chromophores upon light exposure and constructing a dual action plot, we can fold distinct polymer chains into single chain nanoparticles (SCNPs) from the same reaction mixture regardless of pathlength and wavelength-dependency.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Sebastian Gillhuber, Joshua O. Holloway, Hendrik Frisch, Florian Feist, Florian Weigend, Christopher Barner-Kowollik, Peter W. Roesky
Summary: We present a method for folding single-chain nanoparticles (SCNPs) using covalently bonded ferrocene units. In particular, we demonstrate the ability of 2-ferrocenyl-1,10-phenanthroline to induce single-chain collapse and introduce a donor functionality, allowing for the incorporation of a Pd-catalytic site. This results in the synthesis of the first heterobimetallic ferrocene-functionalized SCNP.
CHEMICAL COMMUNICATIONS
(2023)
Article
Polymer Science
Philipp Neidinger, Dominik Voll, Sarah L. Walden, Christopher Barner-Kowollik, Andreas-Neil Unterreiner
Summary: This article introduces a two-photon pulsed laser polymerization method that can penetrate through biological tissue, and demonstrates its reliability through the example of free radical polymerization of methyl methacrylate at different frequencies.
Article
Chemistry, Multidisciplinary
Rita T. Michenfelder, Laura Delafresnaye, Vinh X. Truong, Christopher Barner-Kowollik, Hans-Achim Wagenknecht
Summary: We present a visible light-driven (lambda(max) = 451 nm) photo-chemical approach for labeling DNA in living HeLa cells using the [2+2] cycloaddition reaction of a styrylquinoxaline moiety, which is incorporated into both DNA and the fluorescent label. Our methodology provides a sophisticated platform for mild remote DNA labeling in water, without the need for UV light activation.
CHEMICAL COMMUNICATIONS
(2023)
Article
Polymer Science
Alyssa J. J. Ghielmetti, Christopher Barner-Kowollik, Filip E. E. Du Prez, Hannes A. A. Houck
Summary: The molecular network connectivity in dynamic polymer networks significantly affects material properties and reprocessing conditions. The influence of regioisomerism in light-stabilized dynamic materials has been highlighted. Interchanging regioisomer fractions of substituted naphthalenes with triazolinediones (TADs) in a photo-driven cycloaddition reaction has been demonstrated to affect the cycloreversion kinetics and is important for the design of dynamic covalent materials. The development of completely regioselective TAD/naphthalene systems and the control of cycloreversion kinetics through naphthalene substitution offer new opportunities for the advancement and applications of light-stabilized dynamic materials.
Article
Polymer Science
Philipp Neidinger, Joshua Davis, Joshua A. Carroll, Jochen Kammerer, Esa Jaatinen, Sarah L. Walden, Andreas-Neil Unterreiner, Christopher Barner-Kowollik
Summary: A near infrared action plot from 620 to 950 nm for gold nanorod (AuNR) mediated free-radical polymerization is reported, probing the wavelength-by-wavelength monomer to polymer conversion with an identical number of photons at each wavelength.
Article
Chemistry, Multidisciplinary
Sarah Walden, Joshua Carroll, Andreas-Neil Unterreiner, Christopher Barner-Kowollik
Summary: This article reveals a fundamental mismatch between the absorption spectrum of a chromophore and its photochemical reactivity, highlighting the limitations of the assumption that effective photochemical reactions require strong overlap between the absorption spectrum and the excitation wavelength. The article proposes future directions for understanding action plots and explores the importance of action plots in designing precise photochemical applications.
Article
Polymer Science
Paige A. Shaw, Maxime Klausen, Mark Bradley
Summary: A light-responsive polymer capable of controlled release of camptothecin and generation of reactive oxygen species (ROS) was developed, which exhibited high cancer cell killing activity through both camptothecin release and ROS generation.
Article
Polymer Science
Donghui Zhang, Shiqi Liu, Zhihao Cai, Weizhe Luo, Guojian Liu, Runhui Liu
Summary: A straightforward and efficient method for synthesizing NPC monomers has been developed in this study, which enhances the availability of NPC monomers and facilitates the synthesis of polypeptides.