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Journal articles on the topic 'Covalent Organic Network'

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Author: Grafiati

Published: 25 May 2024

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1

Yuan, Shushan, Xin Li, Junyong Zhu, Gang Zhang, Peter Van Puyvelde, and Bart Van der Bruggen. "Covalent organic frameworks for membrane separation." Chemical Society Reviews 48, no. 10 (2019): 2665–81. http://dx.doi.org/10.1039/c8cs00919h.

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2

Tanski, J. M., and K. Ludford. "Covalent aryloxide metal-organic network materials." Acta Crystallographica Section A Foundations of Crystallography 61, a1 (August 23, 2005): c356. http://dx.doi.org/10.1107/s0108767305084837.

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3

Jiao, Yushuai, Yan Nan, Zhenhua Wu, Xueying Wang, Jiaxu Zhang, Boyu Zhang, Shouying Huang, and Jiafu Shi. "Mechanochemical synthesis of enzyme@covalent organic network nanobiohybrids." Applied Materials Today 26 (March 2022): 101381. http://dx.doi.org/10.1016/j.apmt.2022.101381.

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4

Raja, Arsalan A., and Cafer T. Yavuz. "Charge induced formation of crystalline network polymers." RSC Adv. 4, no. 104 (2014): 59779–84. http://dx.doi.org/10.1039/c4ra10594j.

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5

Yu, Kai, Hua Yang, Binh H. Dao, Qian Shi, and Christopher M. Yakacki. "Dissolution of covalent adaptable network polymers in organic solvent." Journal of the Mechanics and Physics of Solids 109 (December 2017): 78–94. http://dx.doi.org/10.1016/j.jmps.2017.08.006.

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6

Hua, Jiachuan, Chang Liu, Bin Fei, and Zunfeng Liu. "Self-Healable and Super-Tough Double-Network Hydrogel Fibers from Dynamic Acylhydrazone Bonding and Supramolecular Interactions." Gels 8, no. 2 (February 8, 2022): 101. http://dx.doi.org/10.3390/gels8020101.

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Macroscopic hydrogel fibers are highly desirable for smart textiles, but the fabrication of self-healable and super-tough covalent/physical double-network hydrogels is rarely reported. Herein, copolymers containing ketone groups were synthesized and prepared into a dynamic covalent hydrogel via acylhydrazone chemistry. Double-network hydrogels were constructed via the dynamic covalent crosslinking of copolymers and the supramolecular interactions of iota-carrageenan. Tensile tests on double-network and parental hydrogels revealed the successful construction of strong and tough hydrogels. The double-network hydrogel precursor was wet spun to obtain macroscopic fibers with controlled drawing ratios. The resultant fibers reached a high strength of 1.35 MPa or a large toughness of 1.22 MJ/m3. Highly efficient self-healing performances were observed in hydrogel fibers and their bulk specimens. Through the simultaneous healing of covalent and supramolecular networks under acidic and heated conditions, fibers achieved rapid and near-complete healing with 96% efficiency. Such self-healable and super-tough hydrogel fibers were applied as shape memory fibers for repetitive actuating in response to water, indicating their potential in intelligent fabrics.

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7

Li, Suriguga, and Heng Guo Wang. "A covalent organic framework based on multi-carbonyl as anode material for lithium-organic batteries." Journal of Physics: Conference Series 2578, no. 1 (August 1, 2023): 012016. http://dx.doi.org/10.1088/1742-6596/2578/1/012016.

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Abstract A covalent organic framework (COF) with multi-carbonyl was synthesized by a condensation reaction between 1,3,5-triformyl chlorobutanediol (TFP) and 2.5-diamino benzene sulfonic acid (PaSO3H), It is using as anode materials for lithium-ion batteries (LIBs). Benefiting from the rigid porous network structure of COFs (TFP-PaSO3H) and the synergistic effect of covalent bonds, it shows good electrochemical performance, including a high reversible capacity of 427.7 mAh g−1 at 200 mA g−1 after 300 cycles. This contribution shows a broad application prospect of COF anode in lithium-organic batteries.

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8

Cui, Jieshun, and Zhengtao Xu. "An electroactive porous network from covalent metal–dithiolene links." Chem. Commun. 50, no. 30 (2014): 3986–88. http://dx.doi.org/10.1039/c4cc00408f.

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Direct reaction between a hexathiol and PtCl₂ leads to the formation of a covalent metal–organic framework (CMOF) featuring substantial porosity, redox activity and ion exchange capability.

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9

Boscher, Nicolas D., Minghui Wang, Alberto Perrotta, Katja Heinze, Mariadriana Creatore, and Karen K. Gleason. "Metal-Organic Covalent Network Chemical Vapor Deposition for Gas Separation." Advanced Materials 28, no. 34 (June 14, 2016): 7479–85. http://dx.doi.org/10.1002/adma.201601010.

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10

Atas, Mehmet Sahin, Sami Dursun, Hasan Akyildiz, Murat Citir, Cafer T. Yavuz, and Mustafa Selman Yavuz. "Selective removal of cationic micro-pollutants using disulfide-linked network structures." RSC Advances 7, no. 42 (2017): 25969–77. http://dx.doi.org/10.1039/c7ra04775d.

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Micropollutants are found in all water sources, even after thorough treatments that include membrane filtration. We have developed swellable di-sulfide covalent organic polymers (COPs) with great affinity towards cationic textile micropollutants.

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11

Gao, Jia, and Donglin Jiang. "Covalent organic frameworks with spatially confined guest molecules in nanochannels and their impacts on crystalline structures." Chemical Communications 52, no. 7 (2016): 1498–500. http://dx.doi.org/10.1039/c5cc09225f.

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12

Gala, Elena, M. Mar Ramos, and José L. Segura. "Cycloadditions and Cyclization Reactions via Post-Synthetic Modification and/or One-Pot Methodologies for the Stabilization of Imine-Based Covalent Organic Frameworks." Encyclopedia 3, no. 3 (June 25, 2023): 795–807. http://dx.doi.org/10.3390/encyclopedia3030057.

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Interest in covalent organic frameworks as high-value materials has grown steadily since their development in the 2000s. However, the great advantage that allows us to obtain these crystalline materials—the reversibility of the bonds that form the network—supposes a drawback in terms of thermal and chemical stability. Among the different strategies employed for the stabilization of imine-based Covalent Organic Frameworks (COFs), cycloaddition and other related cyclization reactions are especially significant to obtain highly stable networks with extended π-delocalization and new functionalities, expanding even further the potential application of these materials. Therefore, this entry gathered the most recent research strategies for obtaining stable COFs by means of cyclization reactions, including the Povarov reaction and intramolecular oxidative cyclization reactions as well as some other recent innovative approaches.

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13

Zhou, Wei, Wei‐Qiao Deng, and Xing Lu. "Metallosalen covalent organic frameworks for heterogeneous catalysis." Interdisciplinary Materials 3, no. 1 (January 2024): 87–112. http://dx.doi.org/10.1002/idm2.12140.

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AbstractMetallosalen covalent organic frameworks (M(salen)‐COFs) have garnered significant attention as promising candidates for advanced heterogeneous catalysis, including organocatalysis, electrocatalysis, and photocatalysis, due to their unique structural advantages (combining molecules catalysts and crystalline porous materials) and tunable topological network. It is essential to provide a comprehensive overview of emerging designs of M(salen)‐COFs and corresponding advances in this field. Herein, this review first summarizes the reported metallolinkers and the synthesis methods of M(salen)‐COFs. In addition, the review enumerates the excellent M(salen)‐COF based heterogeneous catalysts and discusses the fundamental mechanisms behind the outstanding heterogeneous catalytic performance of M(salen)‐COFs. These mechanisms include the pore enrichment effect (enhancing local concentration within porous materials to promote catalytic reactions), the three‐in‐one strategy (integrating enrichment, reduction, and oxidation sites in one system), and the incorporation of a built‐in electric field (implanting a built‐in electric field in heterometallic phthalocyanine covalent organic frameworks). Furthermore, this review discusses the challenges and prospects related to M(salen)‐COFs in heterogeneous catalysis.

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14

Matei, Iulia, Ana-Maria Ariciu, Elena Irina Popescu, Sorin Mocanu, Alexandru Vincentiu Florian Neculae, Florenta Savonea, and Gabriela Ionita. "Evaluation of the Accessibility of Molecules in Hydrogels Using a Scale of Spin Probes." Gels 8, no. 7 (July 8, 2022): 428. http://dx.doi.org/10.3390/gels8070428.

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In this work, we explored by means of electron paramagnetic resonance (EPR) spectroscopy the accessibility of a series of spin probes, covering a scale of molecular weights in the range of 200–60,000 Da, in a variety of hydrogels: covalent network, ionotropic, interpenetrating polymer network (IPN) and semi-IPN. The covalent gel network consists of polyethylene or polypropylene chains linked via isocyanate groups with cyclodextrin, and the ionotropic gel is generated by alginate in the presence of Ca2+ ions, whereas semi-IPN and IPN gel networks are generated in a solution of alginate and chitosan by adding crosslinking agents, Ca2+ for alginate and glutaraldehyde for chitosan. It was observed that the size of the diffusing species determines the ability of the gel to uptake them. Low molecular weight compounds can diffuse into the gel, but when the size of the probes increases, the gel cannot uptake them. Spin-labelled Pluronic F127 cannot be encapsulated by any covalent gel, whereas spin-labelled albumin can diffuse in alginate gels and in most of the IPN networks. The EPR spectra also evidenced the specific interactions of spin probes inside hydrogels. The results suggest that EPR spectroscopy can be an alternate method to evaluate the mesh size of gel systems and to provide information on local interactions inside gels.

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15

Smykalla, Lars, Pavel Shukrynau, Marcus Korb, Heinrich Lang, and Michael Hietschold. "Surface-confined 2D polymerization of a brominated copper-tetraphenylporphyrin on Au(111)." Nanoscale 7, no. 9 (2015): 4234–41. http://dx.doi.org/10.1039/c4nr06371f.

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16

Zhou, Zekun, Zezhen Zhang, Shuman Feng, Lulu Liu, Weishan Deng, and Lili Wu. "Effective separation of dyes/salts by sulfonated covalent organic framework membranes based on phenolamine network conditioning." RSC Advances 14, no. 21 (2024): 14593–605. http://dx.doi.org/10.1039/d4ra01736f.

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This study developed a modified polyacrylonitrile (PAN) membrane controlled by a phenol–amine network and enhanced with a sulfonated covalent organic framework (SCOF), aimed at improving the efficiency of textile wastewater treatment.

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17

Xiang, Lue, Xianfeng Liu, Huan Zhang, Ning Zhao, and Ke Zhang. "Thermoresponsive self-healable and recyclable polymer networks based on a dynamic quinone methide–thiol chemistry." Polymer Chemistry 11, no. 38 (2020): 6157–62. http://dx.doi.org/10.1039/d0py01008a.

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A new type of thermoresponsive dynamic covalent polymer network was developed with excellent self-healable and recyclable properties based on a new thermoresponsive dynamic covalent chemistry between a para-quinone methide and thiol nucleophiles.

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18

Karis, Dylan, and Alshakim Nelson. "Time-dependent covalent network formation in extrudable hydrogels." Polymer Chemistry 11, no. 43 (2020): 6910–18. http://dx.doi.org/10.1039/d0py01129k.

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19

Zhang, Yuanxing, Ying Wu, Jiayi Li, and Ke Zhang. "Catalyst-free room-temperature self-healing polymer networks based on dynamic covalent quinone methide-secondary amine chemistry." Polymer Chemistry 12, no. 42 (2021): 6161–66. http://dx.doi.org/10.1039/d1py00957e.

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A novel type of dynamic covalent polymer network with a catalyst-free room-temperature self-healing ability was developed on a new dynamic covalent chemistry of aza-Michael addition between para-quinone methide and secondary amine.

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20

Yao, Liang, Yongpeng Liu, Han-Hee Cho, Meng Xia, Arvindh Sekar, Barbara Primera Darwich, Rebekah A. Wells, et al. "A hybrid bulk-heterojunction photoanode for direct solar-to-chemical conversion." Energy & Environmental Science 14, no. 5 (2021): 3141–51. http://dx.doi.org/10.1039/d1ee00152c.

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The development of efficient and stable organic semiconductor-based photoanodes for solar fuel production is advanced by using a robust in situ-formed covalent polymer network together with a mesoporous inorganic film in a hybrid bulk heterojunction.

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21

Gao, Qiang, Xing Li, Guo-Hong Ning, Hai-Sen Xu, Cuibo Liu, Bingbing Tian, Wei Tang, and Kian Ping Loh. "Covalent Organic Framework with Frustrated Bonding Network for Enhanced Carbon Dioxide Storage." Chemistry of Materials 30, no. 5 (February 13, 2018): 1762–68. http://dx.doi.org/10.1021/acs.chemmater.8b00117.

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22

Thirion, Damien, Joo S. Lee, Ercan Özdemir, and Cafer T. Yavuz. "Robust C–C bonded porous networks with chemically designed functionalities for improved CO2 capture from flue gas." Beilstein Journal of Organic Chemistry 12 (October 28, 2016): 2274–79. http://dx.doi.org/10.3762/bjoc.12.220.

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Effective carbon dioxide (CO2) capture requires solid, porous sorbents with chemically and thermally stable frameworks. Herein, we report two new carbon–carbon bonded porous networks that were synthesized through metal-free Knoevenagel nitrile–aldol condensation, namely the covalent organic polymer, COP-156 and 157. COP-156, due to high specific surface area (650 m2/g) and easily interchangeable nitrile groups, was modified post-synthetically into free amine- or amidoxime-containing networks. The modified COP-156-amine showed fast and increased CO2 uptake under simulated moist flue gas conditions compared to the starting network and usual industrial CO2 solvents, reaching up to 7.8 wt % uptake at 40 °C.

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23

Tillman, Kelly R., Rebecca Meacham, Anne N. Rolsma, Mikenzie Barankovich, Ana M. Witkowski, Patrick T. Mather, Tyler Graf, and Devon A. Shipp. "Dynamic covalent exchange in poly(thioether anhydrides)." Polymer Chemistry 11, no. 47 (2020): 7551–61. http://dx.doi.org/10.1039/d0py01267j.

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24

Maassen, Eveline E. L., Johan P. A. Heuts, and Rint P. Sijbesma. "Reversible crosslinking and fast stress relaxation in dynamic polymer networks via transalkylation using 1,4-diazabicyclo[2.2.2] octane." Polymer Chemistry 12, no. 25 (2021): 3640–49. http://dx.doi.org/10.1039/d1py00292a.

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25

Colasson, Benoit, Thomas Devic, Joël Gaubicher, Charlotte Martineau‐Corcos, Philippe Poizot, and Vincent Sarou‐Kanian. "Dual Electroactivity in a Covalent Organic Network with Mechanically Interlocked Pillar[5]arenes." Chemistry – A European Journal 27, no. 37 (May 19, 2021): 9589–96. http://dx.doi.org/10.1002/chem.202100558.

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26

Zhan, Gaolei, Zhen-Feng Cai, Marta Martínez-Abadía, Aurelio Mateo-Alonso, and Steven De Feyter. "Real-Time Molecular-Scale Imaging of Dynamic Network Switching between Covalent Organic Frameworks." Journal of the American Chemical Society 142, no. 13 (March 20, 2020): 5964–68. http://dx.doi.org/10.1021/jacs.0c01270.

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27

Zhou, Xiao-He, Si-Tai Zheng, Jian Wang, Lu Wei, Yu Fan, Li-Juan Liu, Tian-Guang Zhan, Jiecheng Cui, and Kang-Da Zhang. "Toward a Deformable Two-Dimensional Covalent Organic Network with a Noncovalently Connected Skeleton." Chemistry of Materials 32, no. 19 (September 1, 2020): 8139–45. http://dx.doi.org/10.1021/acs.chemmater.0c01344.

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28

Hou, Yali, Shusheng Li, Zeyuan Zhang, Long Chen, and Mingming Zhang. "A fluorescent platinum(ii) metallacycle-cored supramolecular network formed by dynamic covalent bonds and its application in halogen ions and picric acid detection." Polymer Chemistry 11, no. 2 (2020): 254–58. http://dx.doi.org/10.1039/c9py00895k.

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29

Kang, Jiseon, and Seok Il Yun. "Double-Network Hydrogel Films Based on Cellulose Derivatives and κ-Carrageenan with Enhanced Mechanical Strength and Superabsorbent Properties." Gels 9, no. 1 (December 27, 2022): 20. http://dx.doi.org/10.3390/gels9010020.

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Covalently crosslinked sodium carboxymethyl cellulose (CMC)–hydroxyethyl cellulose (HEC) hydrogel films were prepared using citric acid (CA) as the crosslinking agent. Thereafter, the physically crosslinked κ-carrageenan (κ-CG) polymer was introduced into the CMC–HEC hydrogel structure, yielding κ-CG/CMC–HEC double network (DN) hydrogels. The κ-CG physical network provided sacrificial bonding, which effectively dissipated the stretching energy, resulting in an increase in the tensile modulus, tensile strength, and fracture energy of the DN hydrogels by 459%, 305%, and 398%, respectively, compared with those of the CMC–HEC single network (SN) hydrogel. The dried hydrogels exhibited excellent water absorbency with a maximum water-absorption capacity of 66 g/g in distilled water. Compared with the dried covalent SN gel, the dried DN hydrogels exhibited enhanced absorbency under load, attributed to their improved mechanical properties. The water-absorption capacities and kinetics were dependent on the size of the dried gel and the pH of the water.

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30

Liu, Yang, Pengfei Huo, Jiannan Ren, and Guibin Wang. "Organic–inorganic hybrid proton-conducting electrolyte membranes based on sulfonated poly(arylene ether sulfone) and SiO2–SO3H network for fuel cells." High Performance Polymers 29, no. 9 (October 20, 2016): 1037–48. http://dx.doi.org/10.1177/0954008316667790.

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A series of novel organic–inorganic hybrid proton exchange membranes (PEMs) were prepared from the sulfonated poly(arylene ether sulfone) with 4-amino phenyl pendant groups (Am-SPAES), (3-isocyanatopropyl) triethoxysilane (ICPTES), and 3-(trihydroxysilyl) propane-1-sulfonic acid with covalent bonds to form network using a sol-gel method. The obtained cross-linked hybrid membranes (Am-SPAES/I-SiO2-S) displayed excellent solvent resistance and thermal and mechanical stability. The Am-SPAES/I-SiO2-S membranes with cross-linking network exhibited a higher proton conductivity (0.043 S cm−1 at 20°C) than PEMs without covalent bonds (Am-SPAES/SiO2-S) and the swelling ratio maintained below 17.00% even at 100°C. Most importantly, all of the obtained membranes showed considerably lower methanol permeability than that of Nafion 117. In addition, the chemical structures and morphologies of the hybrid membranes were characterized by Fourier transform infrared spectroscopy and scanning electron microscopy, respectively.

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31

Li, Xue, Yuan-Yuan Cui, and Cheng-Xiong Yang. "Covalent coupling fabrication of microporous organic network bonded capillary columns for gas chromatographic separation." Talanta 224 (March 2021): 121914. http://dx.doi.org/10.1016/j.talanta.2020.121914.

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32

Moon, Su-Young, Eunkyung Jeon, Jae-Sung Bae, Mi-Kyoung Park, Chan Kim, Do Young Noh, Eunji Lee, and Ji-Woong Park. "Thermo-processable covalent scaffolds with reticular hierarchical porosity and their high efficiency capture of carbon dioxide." Journal of Materials Chemistry A 3, no. 28 (2015): 14871–75. http://dx.doi.org/10.1039/c5ta02938d.

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33

Yang, Shuo, Huiya Qin, Xuan Li, Huijun Li, and Pei Yao. "Enhancement of Thermal Stability and Cycling Performance of Lithium-Ion Battery at High Temperature by Nano-ppy/OMMT-Coated Separator." Journal of Nanomaterials 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/6948183.

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Nanopolypyrrole/organic montmorillonite- (nano-ppy/OMMT-) coated separator is prepared by coating nano-ppy/OMMT on the surface of polyethylene (PE). Nano-ppy/OMMT-coated separator with three-dimensional and multilayered network structure is beneficial to absorb more organic electrolyte, enhancing the ionic conductivity (reach 4.31 mS·cm-1). Meanwhile, the composite separator exhibits excellent thermal stability and mechanical properties. The strong covalent bonds (Si-F) are formed by the nucleophilic substitution reaction between F−from the thermal decomposition and hydrolysis of LiPF6and the covalent bonds (Si-O) of nano-ppy/OMMT. The Si-F can effectively prevent the formation of HF, POF3, and LiF, resulting in the inhibition of the disproportionation of Mn3+in LiNi1/3Co1/3Mn1/3O2material as well as reducing the internal resistance of the cell. Therefore, the nano-ppy/OMMT-coated separator exhibits outstanding capacity retention and cycling performance at 80°C.

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34

Xu, Luonan, Dong Chen, Qian Zhang, Tian He, Chenjie Lu, Xi Shen, Danting Tang, Huayu Qiu, Mingming Zhang, and Shouchun Yin. "A fluorescent cross-linked supramolecular network formed by orthogonal metal-coordination and host–guest interactions for multiple ratiometric sensing." Polymer Chemistry 9, no. 4 (2018): 399–403. http://dx.doi.org/10.1039/c7py01788j.

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35

Shi, Jiaxin, Tianze Zheng, Yao Zhang, Baohua Guo, and Jun Xu. "Cross-linked polyurethane with dynamic phenol-carbamate bonds: properties affected by the chemical structure of isocyanate." Polymer Chemistry 12, no. 16 (2021): 2421–32. http://dx.doi.org/10.1039/d1py00157d.

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Based on the phenol–carbamate dynamic bond, we designed a strategy to regulate the rearrangement kinetics of the dynamic covalent network in polyurethanes by adjusting the chemical structure of aliphatic isocyanates.

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36

Winne, Johan M., Ludwik Leibler, and Filip E. Du Prez. "Dynamic covalent chemistry in polymer networks: a mechanistic perspective." Polymer Chemistry 10, no. 45 (2019): 6091–108. http://dx.doi.org/10.1039/c9py01260e.

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A selection of dynamic chemistries is highlighted, with a focus on the reaction mechanisms of molecular network rearrangements, and on how mechanistic profiles can be related to the mechanical and physicochemical properties of polymer materials.

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37

Guglielmi, M., G. Brusatin, G. Facchin, and M. Gleria. "Hybrid materials based on the reaction of polyorganophosphazenes and SiO2 precursors." Journal of Materials Research 11, no. 8 (August 1996): 2029–34. http://dx.doi.org/10.1557/jmr.1996.0255.

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New molecular composite materials can be prepared based on an inorganic oxide network and an organic polymer. The polymeric component generally requires low process temperatures, due to the presence of the organic backbone or side groups. A sol-gel process therefore is suitable for synthesizing the inorganic component by dissolving soluble polymers into sol-gel precursor solutions in order to obtain ceramic and polymeric solid phases. In this work polyorganophosphazenes were used because they have many technologically interesting properties (chemical, optical, electrical, mechanical). The methods to obtain covalent bonds between polymer and inorganic network and to obtain homogeneous, transparent hybrid materials without phase separation were studied. It was possible to avoid phase separation by preparing phosphazenes containing free hydroxyl functions and by adequately choosing the experimental conditions.

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38

Wanasinghe, Shiwanka V., Emily M. Schreiber, Adam M. Thompson, Jessica L. Sparks, and Dominik Konkolewicz. "Dynamic covalent chemistry for architecture changing interpenetrated and single networks." Polymer Chemistry 12, no. 13 (2021): 1975–82. http://dx.doi.org/10.1039/d1py00198a.

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39

Fu, Rong-Qiang, Jung-Je Woo, Seok-Jun Seo, Jae-Suk Lee, and Seung-Hyeon Moon. "Covalent organic/inorganic hybrid proton-conductive membrane with semi-interpenetrating polymer network: Preparation and characterizations." Journal of Power Sources 179, no. 2 (May 2008): 458–66. http://dx.doi.org/10.1016/j.jpowsour.2007.12.118.

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40

Li, Qiong, Songqi Ma, Pengyun Li, Binbo Wang, Hongzhi Feng, Na Lu, Sheng Wang, Yanlin Liu, Xiwei Xu, and Jin Zhu. "Biosourced Acetal and Diels–Alder Adduct Concurrent Polyurethane Covalent Adaptable Network." Macromolecules 54, no. 4 (February 10, 2021): 1742–53. http://dx.doi.org/10.1021/acs.macromol.0c02699.

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41

Chen, Xijian, Huifang Xu, Ningsheng Xu, Fenghua Zhao, Wenjiao Lin, Gang Lin, Yunlong Fu, Zhenli Huang, Hezhou Wang, and Mingmei Wu. "Kinetically Controlled Synthesis of Wurtzite ZnS Nanorods through Mild Thermolysis of a Covalent Organic−Inorganic Network." Inorganic Chemistry 42, no. 9 (May 2003): 3100–3106. http://dx.doi.org/10.1021/ic025848y.

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42

Boscher, Nicolas D., Minghui Wang, Alberto Perrotta, Katja Heinze, Mariadriana Creatore, and Karen K. Gleason. "Gas Separation: Metal-Organic Covalent Network Chemical Vapor Deposition for Gas Separation (Adv. Mater. 34/2016)." Advanced Materials 28, no. 34 (September 2016): 7478. http://dx.doi.org/10.1002/adma.201670240.

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43

Freitas, Sunny K. S., Felipe L. Oliveira, Thiago C. Santos, Danilo Hisse, Claudia Merlini, Célia M. Ronconi, and Pierre M. Esteves. "A Carbocationic Triarylmethane‐Based Porous Covalent Organic Network." Chemistry – A European Journal, December 23, 2020. http://dx.doi.org/10.1002/chem.202003554.

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44

Wink, Roy, Soumabrata Majumdar, Rolf A. T. M. van Benthem, Johan P. A. Heuts, and Rint P. Sijbesma. "RNA-Inspired Phosphate Diester Dynamic Covalent Networks." Polymer Chemistry, 2023. http://dx.doi.org/10.1039/d3py00867c.

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Neighboring group assisted rearrangement substantially increases relaxation rates in dynamic covalent networks, allowing easier (re)processing of these materials. In this work, we introduce a dynamic covalent network with anionic phosphate...

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45

Mishra, Biswajit, and Bijay P. Tripathi. "Flexible Covalent Organic Framework Membranes with Linear Aliphatic amines for Enhanced Organic Solvent Nanofiltration." Journal of Materials Chemistry A, 2023. http://dx.doi.org/10.1039/d3ta02683c.

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Covalent organic framework (COF) based membranes hold great promise for organic solvent nanofiltration (OSN) due to their unique molecular arrangement, well-defined porous network, and broader solvent tolerance. However, scaling up...

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46

Nemiwal, Meena, Venu Sharma, and Dinesh Kumar. "Improved Designs of Multifunctional Covalent-Organic Frameworks: Hydrogen Storage, Methane Storage and Water Harvesting." Mini-Reviews in Organic Chemistry 17 (November 27, 2020). http://dx.doi.org/10.2174/1570193x17999201127105752.

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: Covalent Organic Frameworks (COFs) are covalently bonded polymers which are synthesised applying bottomup approach using molecular building units that have pre designed geometry. COFs are crystalline and have control over the position of building units in two and three dimensions due to which highly regular, rigid and porous structures can be developed for tuning chemical and physical properties of the network. The present mini-review provides comprehensive overviews about the applications of the COFs in gas storage and water harvesting.

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Shreeraj, G., Arkaprabha Giri, and Abhijit Patra. "Pushing the Boundaries of Covalent Organic Frameworks through Postsynthetic Linker Exchange." ChemNanoMat, October 24, 2023. http://dx.doi.org/10.1002/cnma.202300398.

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Covalent organic frameworks (COFs) are a fast‐developing family of porous organic materials that have received substantial research interest during the last two decades. Dynamic covalent chemistry (DCC) is the cornerstone of COF fabrication. DCC is a process that entails reversible bond breaking‐reforming under equilibrium to attain the thermodynamically most stable structure. Due to the reversible nature of the covalent linkages, the building blocks of pre‐synthesized COF or pre‐assembled chemical entities, like network polymers and supramolecular hosts, can be replaced postsynthetically under appropriate reaction conditions. The technique is known as postsynthetic linker exchange (PLE). PLE provides an easy way to introduce functional building blocks into the COF backbone. In this article, we have highlighted the recent advancements (from 2017 to 2023) in the postsynthetic linker exchange strategy for constructing highly crystalline and porous COFs that are often unattainable via de novo fabrication. The mechanistic insights of the linker exchange process for the transformation of various parent entities, such as COFs, amorphous covalent organic networks, linear polymers, and molecular cages to daughter COFs, have been deliberated with fascinating examples. We have also outlined some future avenues for applying the PLE process for the large‐scale fabrication of highly crystalline COFs for real‐time applications.

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Lundberg, David J., Christopher M. Brown, Eduard O. Bobylev, Nathan J. Oldenhuis, Yasmeen S. Alfaraj, Julia Zhao, Ilia Kevlishvili, Heather J. Kulik, and Jeremiah A. Johnson. "Nested non-covalent interactions expand the functions of supramolecular polymer networks." Nature Communications 15, no. 1 (May 10, 2024). http://dx.doi.org/10.1038/s41467-024-47666-x.

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AbstractSupramolecular polymer networks contain non-covalent cross-links that enable access to broadly tunable mechanical properties and stimuli-responsive behaviors; the incorporation of multiple unique non-covalent cross-links within such materials further expands their mechanical responses and functionality. To date, however, the design of such materials has been accomplished through discrete combinations of distinct interaction types in series, limiting materials design logic. Here we introduce the concept of leveraging “nested” supramolecular crosslinks, wherein two distinct types of non-covalent interactions exist in parallel, to control bulk material functions. To demonstrate this concept, we use polymer-linked Pd2L4 metal–organic cage (polyMOC) gels that form hollow metal–organic cage junctions through metal–ligand coordination and can exhibit well-defined host-guest binding within their cavity. In these “nested” supramolecular network junctions, the thermodynamics of host-guest interactions within the junctions affect the metal–ligand interactions that form those junctions, ultimately translating to substantial guest-dependent changes in bulk material properties that could not be achieved in traditional supramolecular networks with multiple interactions in series.

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Pruksawan, Sirawit, Yi Ting Chong, Wylma Zen, Terence Jun En Loh, and FuKe Wang. "Sustainable Vat Photopolymerization‐Based 3D‐Printing through Dynamic Covalent Network Photopolymers." Chemistry – An Asian Journal, March 20, 2024. http://dx.doi.org/10.1002/asia.202400183.

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Vat photopolymerization (VPP) based three‐dimensional (3D) printing, including stereolithography (SLA) and digital light projection (DLP), is known for producing intricate, high‐precision prototypes with superior mechanical properties. However, the challenge lies in the non‐recyclability of covalently crosslinked thermosets used in these printing processes, limiting the sustainable utilization of printed prototypes. This review paper examines the recently explored avenue of VPP 3D‐printed dynamic covalent network (DCN) polymers, which enable reversible crosslinks and allow for the reprocessing of printed prototypes, promoting sustainability. These reversible crosslinks facilitate the rearrangement of crosslinked polymers, providing printed polymers with chemical/physical recyclability, self‐healing capabilities, and degradability. While various mechanisms for DCN polymer systems are explored, this paper focuses solely on photocurable polymers to highlight their potential to revolutionize the sustainability of VPP 3D printing.

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Schweng, Paul, Changxia Li, Patrick Guggenberger, Freddy Kleitz, and Robert Woodward. "A Sulfonated Covalent Organic Framework for Atmospheric Water Harvesting." ChemSusChem, May 17, 2024. http://dx.doi.org/10.1002/cssc.202301906.

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We report a sulfonated covalent organic framework (COF) capable of atmospheric water harvesting in arid conditions. The isothermal water uptake profile of the framework was studied, and the network displayed steep water sorption at low relative humidity (RH) in temperatures of up to 45 °C, reaching a water uptake of 0.12 g·g−1 at 10% RH and even 0.08 g·g−1 at just 5% RH, representing some of the most extreme conditions on the planet. We found that the inclusion of sulfonate moieties shifted uptake in the water isotherm profiles to lower RH compared to non‐sulfonated equivalents, demonstrating well the benefits of including these hydrophilic sites for water uptake in hot arid locations. Repeated uptake and desorption were performed on the network without significant detriment to its adsorption performance, demonstrating the potential of the sulfonated COF for real‐world implementation.

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