Article
Chemistry, Physical
Felix Ziegler, Hamzeh Kraus, Mathis J. Benedikter, Dongren Wang, Johanna R. Bruckner, Michal Nowakowski, Kilian Weisser, Helena Solodenko, Guido Schmitz, Matthias Bauer, Niels Hansen, Michael R. Buchmeiser
Summary: By utilizing cationic molybdenum imido alkylidene N-heterocyclic carbene (NHC) complexes confined in tailored ordered mesoporous silica, high macrocyclization selectivities up to 98% and high substrate concentrations up to 0.1 M can be achieved. Molecular dynamics simulations reveal that high conversions are a result of the proximity between the surface-bound catalyst and surface-located substrates, leading to increased reaction efficiency.
Article
Chemistry, Multidisciplinary
Janis Musso, Jordan De Jesus Silva, Mathis J. Benedikter, Jonas Groos, Wolfgang Frey, Christophe Coperet, Michael R. Buchmeiser
Summary: Recent studies have shown that cationic d(0) group 6 olefin metathesis catalysts exhibit higher activity compared to their neutral counterparts, and their catalytic performance is greatly enhanced by immobilization on silica.
Article
Chemistry, Physical
Hongyu Wang, Chen-Fei Liu, Tong-De Tan, Kyna Ru Bin Khoo, Ming Joo Koh
Summary: The study demonstrates a new method for the highly efficient and site-selective 1,2-diarylation of aliphatic-1,3-dienes using N-heterocyclic carbene (NHC)-Ni(0) catalyst, allowing for the synthesis of products containing tertiary or quaternary centers.
Article
Chemistry, Multidisciplinary
Franziska Hanusch, Dominik Munz, Joerg Sutter, Karsten Meyer, Shigeyoshi Inoue
Summary: The facile synthesis of the first bis-N-heterocyclic imine-stabilized chlorosilyliumylidene and its consecutive reaction with PPh3AuCl and K2Fe(CO)(4) resulted in the formation of a unique heterobimetallic complex. The complex bears an unusual linear Si-Au-Fe structure with a rare anagostic interaction between the gold atom and a CH bond. Computational analysis shows strong hyperconjugative back donation from the gold(I) atom to the silyliumylidene ligand.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Biochemistry & Molecular Biology
Panpan Yang, Junyi Zhao, Dirong Gong, Xiaoyu Jia
Summary: A zwitterionic cellulose fibre has been fabricated and shown to be very efficient for removing thallium from water samples. It has high adsorption capacity and selectivity, and its stability against pH variation makes it potentially feasible for treating thallium-polluted environmental samples.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Chemistry, Inorganic & Nuclear
Ajay Padunnappattu, Carine Duhayon, Vincent Cesar, Yves Canac
Summary: In this study, a tricationic imidazolium salt with two N-cyclopropenio substituents was prepared using the onio-substitution strategy. The electronic properties of the related dicationic NHC were evaluated, and it was found to be one of the least-donating cationic NHCs reported so far. The ability of this compound to coordinate with Pd(II) and Au(I) centers was also investigated, and corresponding complexes were characterized.
Article
Engineering, Environmental
Yan Bao, Lu Gao, Feitong Wang, Jianzhong Ma
Summary: Gemini surfactants are in high demand globally for their potential applications in paper, medical hygiene, and textile industries. This study focuses on the design and synthesis of Gemini surfactants integrated with biosafety and multi-functionality for environmental protection and cost-effective industrial processes. The effects of three heterocyclic cationic Gemini surfactants with different hydrophilic groups on antibacterial, dispersion, and fixation properties in leather processing are investigated.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Materials Science, Multidisciplinary
Cesar M. Laureano-Anzaldo, Jorge R. Robledo-Ortiz, Ricardo Manriquez-Gonzalez
Summary: This study developed zwitterionic cellulose with versatile potential for removing various anionic and cationic dyes, achieving high removal efficiency.
Article
Engineering, Environmental
YunJin Kim, Jinseok Park, Junsik Bang, Jungkyu Kim, Hyoung-Joon Jin, Hyo Won Kwak
Summary: Nanocellulose has promising applications in water treatment due to its unique properties, such as renewability and large surface area; a study showed that carboxymethyl cellulose nanofibrils modified with polyethyleneimine had excellent Cr(VI) removal capacity and stability; the removal of Cr(VI) was achieved through a combination of electrostatic attraction, chemical reduction, and chelation mechanisms.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Chemistry, Physical
Ricardo J. Alves, Laize Zaramello, Elvis N. Nishida, Frank H. Quina, Bruno S. Souza
Summary: In this study, we investigated the transient formation of N-heterocyclic carbenes (NHCs) in zwitterionic imidazolium sulfonate surfactants in a water environment. The formation of NHCs was accelerated above the critical micelle concentration, due to increased local concentration of hydroxide or deuteroxide ions. The rate of NHC formation could be controlled by the anions of added salts, which also affected the selectivity of anion binding to the micelle surface. The NHCs generated at the micelle surface promoted the selective oxidation of 4-nitrobenzaldehyde, demonstrating the importance of micellar microenvironment in controlling reactivity and selectivity in aqueous media.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Organic
Qijing Zhang, Hao Lei, Cong-Ying Zhou, Chengming Wang
Summary: N-Polyheterocycles can be rapidly accessed by N-heterocyclic carbene (NHC) catalysis through regioselective sequential radical addition/cyclization in the absence of any metals or oxidants. This transformation offers mild conditions, wide substrate scope, and excellent functional group compatibility.
Article
Chemistry, Multidisciplinary
Sumana Mondal, Tejender Singh, Sudip Baguli, Soumya Ghosh, Debabrata Mukherjee
Summary: A fluorenyl-tethered N-heterocyclic carbene LH and its monoanionic version L- were studied for their complexation with zinc in the hydroboration of various substrates. The high 1,2-regioselectivity of N-heteroarenes was explained by computational analyses. The catalytic activity of monodentate LH was found to be better than chelating L- despite both forming three-coordinate zinc complexes.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Multidisciplinary Sciences
Jan Vrana, Josef Holub, Maksim A. Samsonov, Zdenka Ruzickova, Josef Cvacka, Michael L. McKee, Jindrich Fanfrlik, Drahomir Hnyk, Ales Ruzicka
Summary: In contrast to the prevalence of neutral or anionic species, the authors have developed a method to prepare water-soluble cationic polyhedral boranes by reacting closo-10-vertex carboranes with N-heterocyclic carbenes. These cationic boron clusters may have potential for novel applications.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Fulong Li, Yan Du, Youxiang Liang, Yuwen Wei, Yukun Zheng, Huimin Yu
Summary: This study redesigned a trans-aminase enzyme to enhance its catalytic efficiency towards bulky N-heterocyclic compounds. A variant with significant activity enhancement was obtained by fine-tuning the substrate-binding pocket with a simplified amino acid alphabet. The most active variant exhibited 1064-fold greater catalytic efficiency and improved activity towards a series of cyclic and bulky heterocyclic ketones. It also showed successful gram-scale synthesis of a chiral N-heterocyclic amine.
Article
Engineering, Environmental
Qing Liu, Zhuojun Meng, Antti Korpi, Eero Kontturi, Mauri A. Kostiainen
Summary: The study utilized biomass-derived cellulose nanocrystal colloid conjugated with cationic polyelectrolytes to achieve fast, efficient, and selective heparin recovery. Selective heparin capture was demonstrated by adjusting salt concentration or pH. After several recycle rounds, the cationic nanocrystals retained their heparin-recovery ability and recovered the majority of active heparin dose.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Polymer Science
Chainika Jangu, Alison R. Schultz, Candace E. Wall, Alan R. Esker, Timothy E. Long
MACROMOLECULAR RAPID COMMUNICATIONS
(2016)
Article
Chemistry, Physical
Feng Jiang, Chen Qian, Alan R. Esker, Maren Roman
JOURNAL OF PHYSICAL CHEMISTRY B
(2017)
Article
Chemistry, Applied
Tyler G. Grissom, Justin M. Sirrine, Tithothy E. Long, Alan R. Esker, John R. Morris
PROGRESS IN ORGANIC COATINGS
(2017)
Article
Nanoscience & Nanotechnology
Zhou Ye, AhRam Kim, Carolyn Y. Mottley, Michael W. Ellis, Candace Wall, Alan R. Esker, Amrinder S. Nain, Bahareh Behkam
ACS APPLIED MATERIALS & INTERFACES
(2018)
Article
Chemistry, Physical
Jie Zhu, Jianzhao Liu, Yered Machain, Brittany Bonnett, Shaoyang Lin, Meng Cai, Matthew C. Kessinger, Pavel M. Usov, Wenqian Xu, Sanjaya D. Senanayake, Diego Troya, Alan R. Esker, Amanda J. Morris
JOURNAL OF MATERIALS CHEMISTRY A
(2018)
Article
Chemistry, Multidisciplinary
Congcong Wu, Kai Wang, Yongke Yan, Dong Yang, Yuanyuan Jiang, Bo Chi, Jianzhao Liu, Alan R. Esker, Jennifer Rowe, Amanda J. Morris, Mohan Sanghadasa, Shashank Priya
ADVANCED FUNCTIONAL MATERIALS
(2019)
Article
Engineering, Manufacturing
Yun Bai, Candace Wall, Hannah Pham, Alan Esker, Christopher B. Williams
JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME
(2019)
Article
Chemistry, Physical
Qiongdan Xie, Bingbing Li, Alan R. Esker
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2020)
Article
Biochemistry & Molecular Biology
Jianzhao Liu, Yuan Zhu, Chao Wang, Barry Goodell, Alan R. Esker
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2020)
Article
Chemistry, Multidisciplinary
Lei Tao, Anyang Hu, Zhijie Yang, Zhengrui Xu, Candace E. Wall, Alan R. Esker, Zhifeng Zheng, Feng Lin
ADVANCED FUNCTIONAL MATERIALS
(2020)
Article
Chemistry, Applied
Jennifer Zornjak, Jianzhao Liu, Alan Esker, Tiantian Lin, Cristina Fernandez-Fraguas
FOOD HYDROCOLLOIDS
(2020)
Article
Biochemistry & Molecular Biology
Guoqiang Yu, Gehui Liu, Tianyi Liu, Ethan H. Fink, Alan R. Esker
Summary: Changes in mass and viscoelasticity of fungal chitin layers during chitinase attack were studied using regenerated chitin (RChitin) thin films as a mimic. The degradation of RChitin films by family 18 chitinases and family 19 chitinases with chitin-binding domains (CBDs) was monitored in real time. The results showed that chitinase adsorption significantly affected the degradation of RChitin films, and CBDs played an important role in the degradation of insoluble substrates.
Article
Chemistry, Physical
Lei Tao, Zhengrui Xu, Chunguang Kuai, Xuerong Zheng, Candace E. Wall, Chao Jiang, Alan R. Esker, Zhifeng Zheng, Feng Lin
ENERGY STORAGE MATERIALS
(2020)
Article
Chemistry, Multidisciplinary
Joshua D. Kittle, Chen Qian, Emma Edgar, Maren Roman, Alan R. Esker