Article
Chemistry, Multidisciplinary
Anthony Keyes, Huong Dau, Krzysztof Matyjaszewski, Eva Harth
Summary: A new orthogonal radical/spin coupling technique has been identified in this study, which enables living insertion and controlled radical polymerization of polyolefins. This technique shows broad tolerance for different radical/spin traps and can be used for the synthesis of polyolefin-polyvinyl block copolymers with various segments.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Polymer Science
Maksym Odnoroh, Jean-Daniel Marty, Valerie Bourdon, Olivier Coutelier, Mathias Destarac
Summary: RAFT polymerization enables the synthesis of (co)polymers with primary benzene sulfonamide groups, using either an acrylamido sulfonamide monomer or a sulfonamide-functional trithiocarbonate RAFT agent. This research expands the possibilities for creating pH-responsive block copolymers and functional polymeric vectors with targeting properties for biomedical applications.
Article
Biochemistry & Molecular Biology
Mateusz Grabowski, Bartlomiej Kost, Agnieszka Bodzioch, Melania Bednarek
Summary: This paper presents a new strategy for preparing block copolymers of polylactide (PLA), using multiple inifer groups to introduce vinyl monomers (VM) into PLA chains. The inifer group tetraphenylethane (TPE) was incorporated into PLA chains using diisocyanate. The ability of PLA-PU to form initiating radicals was demonstrated, and block copolymers PLA/PVM were successfully formed through polymerization of acrylonitrile and styrene using PLA-PU as a macroinifer.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Polymer Science
Harpal S. Dhiraj, Fumi Ishizuka, Maria Saeed, Amr Elshaer, Per B. Zetterlund, Fawaz Aldabbagh
Summary: Higher order morphologies, such as rods and worms, can be formed by combining core-shell nanoparticles with boronic acid moieties under basic conditions. For the first time, it is observed that lactate, an anaerobic metabolite, can bind to the BA moiety of amphiphilic block copolymers at a lower physiological pH of 7.4. Self-assembly experiments show that the resulting nanoparticles have similar structures to those formed by reacting with glucose.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Polymer Science
Min Ki Cho, Hyun Ji Seo, Ji Hoon Lee, Woo Kyung Cho, Kyung-sun Son
Summary: Surface-initiated reversible addition-fragmentation chain transfer polymerization using oxygen (O-2-SI-RAFT) allows material-independent surface coating on various substrates in the presence of air. The excellent growth of polymer brushes, including the highest reported growth on Ti/TiO2 substrates, was characterized. Additionally, large surfaces can be coated with polymer brushes by O-2-SI-RAFT, demonstrating versatility and efficiency.
Article
Chemistry, Multidisciplinary
Yang Zeng, Qinzhi Quan, Peng Wen, Zexi Zhang, Mao Chen
Summary: In this work, a light-driven organocatalyzed copolymerization method using TFVB was reported for the controlled synthesis of a variety of hybrid fluorine/boron polymers with low dispersities and good chain-end fidelity. The combination of fluorine and boron was shown to provide high-performance copolymer electrolytes with a high lithium-ion transference number, offering new opportunities for engineering high-performance materials for energy storage.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Polymer Science
Yulia Kuznetsova, Ksenya Gushchina, Karina Sustaeva, Alexander Mitin, Marfa Egorikhina, Victoria Chasova, Lyudmila Semenycheva
Summary: Graft gelatin and poly(methyl methacrylate) copolymers with cross-linked structure were successfully synthesized in the presence of the tributylborane-2,5-di-tert-butyl-p-benzoquinone system. Compared with other initiating systems, this system exhibited a better cross-linking structure and showed high regenerative potential.
Review
Polymer Science
Nankai An, Xi Chen, Jinying Yuan
Summary: RAFT PISA enables efficient synthesis of polymeric nanoparticles, but thermal initiation restricts the incorporation of temperature-sensitive biomolecules. Recent developments in non-thermal initiation techniques have addressed this issue, offering new possibilities for bio-related applications.
Article
Polymer Science
Yi-Qi Chen, Bi-Xin Jin, Qin Li, Yun-Jun Luo, Shu-Meng Chi, Xiao-Yu Li
Summary: Heavy metallic salts can induce supramolecular polymerization and fibrilization in liquid crystalline block copolymers. The block copolymer monomers can bind with the metallic salts to form small aggregates, which act as seeds to trigger the supramolecular polymerization of the rest of the monomers. The length of the resulting supramolecular polymer fibrils is linearly proportional to the ratios between the block copolymer and the metallic salts, and is influenced by the choice of metallic cations and counterions. This method can be used to polymerize different block copolymer monomers to produce pentablock supramolecular polymers in a one-pot manner.
CHINESE JOURNAL OF POLYMER SCIENCE
(2022)
Article
Polymer Science
Nilanjan Mukherjee, Anupam Das, Moumita Dhara, Tushar Jana
Summary: The development of block copolymer grafted SiNP as functional nanofiller for nanocomposites-based PEM showed promising results in improving thermal, mechanical, and chemical stabilities, as well as proton conductivity. The structure, sequence, and length of polymer chains on SiNP surface were found to significantly influence the properties of the nanofiller and ultimately alter the PEM properties. The clear dependence of PEM properties on the architecture of BC-g-SiNP highlights the importance of understanding the impact of chain length and sequence on nanofiller performance.
Article
Polymer Science
Ryo Takabayashi, Stephan Feser, Hiroshi Yonehara, Ilhyong Ryu, Takahide Fukuyama
Summary: The nitroxide-mediated radical polymerization (NMP) of styrene and butyl acrylate using BlocBuilder MA under continuous flow reaction conditions showed higher conversions and smaller polydispersity index (D) values compared with batch reaction conditions. The addition of a small amount of acetol or malononitrile accelerated the NMP reaction without sacrificing D values. Flow reactors enable the highly controlled synthesis of styrene and butyl acrylate NMP reactions initiated by BlocBuilder MA (BB MA) with additives, and BA-St di-block copolymers were also synthesized.
Article
Materials Science, Multidisciplinary
Chen Liang, Jianhua Hou, Yanhui Li, Dajun Liu, Jian Li, Xu Cui, Qian Duan
Summary: The study successfully synthesized well-controlled brush-shaped block copolymers of high molecular weight with polystyrene and polylactic side chains. After self-assembly, the copolymers exhibited two immiscible phases, partial crystallization, and a pearlescent appearance with wide band reflection. The reflection in the visible range increased with the decrease in domain spacing as the self-assembly temperature increased, but the reflection wavelength range remained unchanged.
Article
Chemistry, Physical
Naralyne M. Pesqueira, Camila Bignardi, Larissa F. Oliveira, Antonio E. H. Machado, Valdemiro P. Carvalho-Jr, Beatriz E. Goi
Summary: Four nickel(II) complexes with symmetrically substituted N2O2 tetradentate Schiff-base ligands were synthesized and used as control agents for the polymerization of vinyl acetate. The third complex showed the best control over the polymerization process.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2023)
Article
Chemistry, Physical
Kyungtae Kim, Byeong-Hyeok Sohn
Summary: The length of the corona in spherical micelles of block copolymers is determined by the molecular weight of the corona-forming block relative to that of the core block before assembly. By selectively extending the corona block using surface-initiated polymerization, it is possible to convert crew-cut micelles to hairy micelles while maintaining the spherical shape. This method allows for the creation of micelles with different corona lengths and shapes, providing insight into the packing problem in copolymer micelle assembly.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Shukanta Bhowmik, Thu Thao Pham, Rintaro Takahashi, Dongwook Kim, Hideki Matsuoka, Kazuhiko Ishihara, Shin-ichi Yusa
Summary: Cationic random copolymers and anionic random copolymers were prepared using a reversible addition-fragmentation chain transfer method. The copolymers were mixed to form water-soluble polyion complex micelles, with MPC-rich surface and MCC/MPS core. The size of these micelles depended on the mixing ratio of the oppositely charged copolymers.
Article
Chemistry, Multidisciplinary
Anthony Keyes, Huong Dau, Krzysztof Matyjaszewski, Eva Harth
Summary: A new orthogonal radical/spin coupling technique has been identified in this study, which enables living insertion and controlled radical polymerization of polyolefins. This technique shows broad tolerance for different radical/spin traps and can be used for the synthesis of polyolefin-polyvinyl block copolymers with various segments.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Huong Dau, Enkhjargal Tsogtgerel, Krzysztof Matyjaszewski, Eva Harth
Summary: This study develops the PACE process for the synthesis of well-defined polyolefin-polyvinyl block copolymers. Through kinetic studies, the design criteria for catalyst activation in alpha-diimine Pd-II-catalyzed olefin polymerizations are established. The prepared polyolefin macroinitiators or macro-mediators with diverse functional groups enable various controlled polymerization techniques. Different block copolymers with varied architectures, molecular weights, and compositions are successfully prepared using ROP, NMP, and PI-RAFT. The distinct properties of polyolefin-polyacrylamide block copolymers are utilized in polymerization-induced self-assembly for studying nanostructure behaviors.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Review
Chemistry, Multidisciplinary
Huong Dau, Glen R. Jones, Enkhjargal Tsogtgerel, Dung Nguyen, Anthony Keyes, Yu-Sheng Liu, Hasaan Rauf, Estela Ordonez, Valentin Puchelle, Hatice Basbug Alhan, Chenying Zhao, Eva Harth
Summary: This review provides a comprehensive overview of techniques to prepare linear block copolymers and serves as a guide on how polymerization techniques can be combined to achieve desired block combinations, promoting the advancement and broadening of block copolymer applications.
Editorial Material
Polymer Science
Ullrich Scherf, Eva Harth
JOURNAL OF POLYMER SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Chenggang Jiang, Louise M. Canada, Ngoc Bao Nguyen, Michael D. S. Halamicek, Sami H. Nguyen, Thomas S. Teets
Summary: Ligand-centered functionalization reactions provide diverse strategies for preparing luminescent organometallic compounds with unique structures and enhanced or unusual photophysical properties. In this study, novel luminescent structures are formed by the reaction of bis-cyclo-metalated iridium bis-isocyanide complexes (1) with azide (N3-), and the outcome of the reaction depends on the substituent on the aryl isocyanide. The resulting compounds exhibit high photoluminescence quantum yields, with exceptional values of 0.81 for sky-blue emission, 0.87 for yellow emission, and 0.65 for orange-red emission in polymer films.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Inorganic & Nuclear
Sungwon Yoon, Thomas G. Gray, Thomas S. Teets
Summary: Compounds with high photoluminescence quantum yields (phi(PL)) in the deep-red to near-infrared spectrum are in demand for various applications. In this study, a new suite of bis-cyclometalated iridium complexes with efficient luminescence beyond 650 nm is introduced. These complexes exhibit deep-red phosphorescence with wavelengths between 650 and 700 nm and solution quantum yields between 0.018 and 0.42.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Dung Nguyen, Shengguang Wang, Lars C. Grabow, Eva Harth
Summary: This work explains a paradox observed in the polymerization of alpha-olefin using palladium-diimine catalysts. The study reveals a novel mechanistic pathway for Pd(II)-diimine complexes, which provides a comprehensive understanding of the phenomenon.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Inorganic & Nuclear
Morris E. Olumba, Ryan M. O'Donnell, Thomas N. N. Rohrabaugh Jr, Thomas S. Teets
Summary: Bis-cyclometalatediridium complexes with pyrene-substitutedisocyanide ancillary ligands are a promising class of nonlinear optical materials. The triplet-state photophysics are dominated by the pyrene groups, resulting in red luminescence at 77 K and intense, long-lived excited-state absorption. This study introduces a strategy for intense excited-state absorption (ESA) that involves bis-cyclometalated iridium complexes with isocyanide ancillary ligands decorated with pyrene triplet acceptors.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Chenggang Jiang, Sungwon Yoon, Yennie H. Nguyen, Thomas S. Teets
Summary: Red and deep-red emitting heteroleptic bis-cyclometalated iridium(III) complexes supported by different ancillary ligands have been introduced in this study. These compounds exhibit high photoluminescence quantum yields in the red or deep-red region.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Vinh Q. Dang, Thomas S. Teets
Summary: Visible-light photoredox catalysis is a powerful and versatile organic synthesis strategy. However, some substrate classes, such as carbonyl derivatives, are not very amenable to photoredox approaches. In this work, a range of photoredox transformations on challenging ketone and imine substrates are unveiled, enabled by strongly reducing photosensitizers and operating under simple, general conditions with no additives.
Article
Chemistry, Multidisciplinary
Yennie H. Nguyen, Vinh Q. Dang, Joao Vitor Soares, Judy I. Wu, Thomas S. Teets
Summary: The lack of efficient and robust deep-blue phosphorescent metal complexes is a major challenge in electroluminescent color displays. Increasing the s-donating ability of the ligands can ameliorate the deactivation of blue phosphors by low-lying metal-centered states. We have revealed a synthetic strategy to access blue-phosphorescent complexes using two supporting acyclic diaminocarbenes (ADCs), which are stronger s-donors than N-heterocyclic carbenes (NHCs). These new platinum complexes have excellent photoluminescence quantum yields, with four out of six complexes exhibiting deep-blue emission. Experimental and computational analyses confirm the destabilization of the (MC)-M-3 states by the ADCs.
Article
Chemistry, Inorganic & Nuclear
Sungwon Yoon, Thomas. S. S. Teets
Summary: The design of deep-red to near-infrared (DR-NIR) phosphorescent compounds with high photoluminescence quantum yields is a significant challenge with important implications for optoelectronic devices, imaging, and sensing. Bis-cyclometalated iridium complexes with electron-rich ancillary ligands exhibit exceptional quantum yields for DR-NIR phosphorescence, influenced by solvent interactions and charge-transfer characteristics. Ancillary ligands can perturb excited-state kinetics, leading to enhanced quantum yields in the DR-NIR region, especially in toluene solution and doped polymer films.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Chemistry, Multidisciplinary
Dooyoung Kim, Thomas G. Gray, Thomas S. Teets
Summary: This study describes four new heteroleptic bis-chelate Cu(i) complexes with panchromatic visible absorption. By modifying the ligands, the energy levels of the spatially separated HOMO and LUMO can be independently and systematically controlled, resulting in charge-transfer absorption bands throughout the visible and NIR regions that cover a wider range than typical Cu(i) chromophores.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Yanyu Wu, Gregory D. Sutton, Michael D. S. Halamicek, Xinxin Xing, Jiming Bao, Thomas S. Teets
Summary: In this work, a new series of ratiometric oxygen sensors based on phosphorescent cyclometalated iridium centers and organic coumarin fluorophores is introduced. These sensors exhibit dual emission and can function as ratiometric oxygen sensors. One of the sensors operates under hyperoxic conditions, while the other two are sensitive to low levels of oxygen and can be used as hypoxic sensors.
Review
Chemistry, Physical
Dooyoung Kim, Thomas S. Teets
Summary: Photoredox catalysis is crucial in many applications, with its activity depending on the photophysical and electrochemical properties of photocatalysts, especially in challenging organic synthesis reactions.
CHEMICAL PHYSICS REVIEWS
(2022)