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Articoli di riviste sul tema "Imidazolium immobilization"

Autore: Grafiati
Pubblicato: 11 gennaio 2025

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1

Finn, M., N. An e A. Voutchkova-Kostal. "Immobilization of imidazolium ionic liquids on hydrotalcites using silane linkers: retardation of memory effect". RSC Advances 5, n. 17 (2015): 13016–20. http://dx.doi.org/10.1039/c4ra13839b.

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Abstract (sommario):
We report a new covalent surface immobilization of silane-modified imidazolium ionic liquids on hydrotalcite-like materials (HTs) and provide detailed characterization of the resulting surface chemistry using PXRD, CP-MAS, TGA and FT-IR.
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2

Bahadorikhalili, Saeed, Leila Ma’mani, Hossein Mahdavi e Abbas Shafiee. "Palladium catalyst supported on PEGylated imidazolium based phosphinite ionic liquid-modified magnetic silica core–shell nanoparticles: a worthy and highly water-dispersible catalyst for organic reactions in water". RSC Advances 5, n. 87 (2015): 71297–305. http://dx.doi.org/10.1039/c5ra12747e.

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A highly water-dispersible palladium nanocatalyst was fabricated by the immobilization of Pd onto the surface of PEGylated imidazolium based phosphinite ionic liquid functionalized γ-Fe2O3@SiO2 core–shell nanoparticles.
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3

Tripathi, Alok Kumar, Yogendra Lal Verma e Rajendra Kumar Singh. "Thermal, electrical and structural studies on ionic liquid confined in ordered mesoporous MCM-41". Journal of Materials Chemistry A 3, n. 47 (2015): 23809–20. http://dx.doi.org/10.1039/c5ta05090a.

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Abstract (sommario):
In the present study, immobilization of different amounts of ionic liquid (IL) 1-ethyl-3-methyl imidazolium tetrafluoroborate [EMIM][BF4] into the pores of ordered mesoporous MCM-41 (Mobil Composition of Matter no. 41) has been accomplished successfully.
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4

Sharma, Anshu, Kamla Rawat, Pratima R. Solanki e H. B. Bohidar. "Electrochemical response of agar ionogels towards glucose detection". Analytical Methods 7, n. 14 (2015): 5876–85. http://dx.doi.org/10.1039/c5ay01310k.

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We have reported a sensing platform comprising of agar ionogels (IGs) made in ionic liquid solutions (1-octyl-3-methyl imidazolium chloride [C8mim][Cl] and 1-ethyl-3-methylimidazolium chloride [C2mim][Cl]) and used it for glucose oxidase (GOx) immobilization for glucose detection.
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5

Mahmoudi, Hamed, Federica Valentini, Francesco Ferlin, Lucia Anna Bivona, Ioannis Anastasiou, Luca Fusaro, Carmela Aprile, Assunta Marrocchi e Luigi Vaccaro. "A tailored polymeric cationic tag–anionic Pd(ii) complex as a catalyst for the low-leaching Heck–Mizoroki coupling in flow and in biomass-derived GVL". Green Chemistry 21, n. 2 (2019): 355–60. http://dx.doi.org/10.1039/c8gc03228a.

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A new polystyrene-type resin loaded with pincer-type imidazolium ionic tag has been very effective in the immobilization of [PdCl4]2− palladium complex leading to a very low leaching of the metal during its use in flow.
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6

Yuan, Ya Mei, Qiu Jin Li, Song Kun Yao, Ji Xian Gong e Jian Fei Zhang. "Different Patterns of Ionic Liquids-Regenerated Cellulose Carriers for Papain Immobilization". Advanced Materials Research 864-867 (dicembre 2013): 319–23. http://dx.doi.org/10.4028/www.scientific.net/amr.864-867.319.

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Different patterns (beads, membranes and powders) of cellulose regenerated from room temperature ionic liquid 1-butyl-3-methyl imidazolium chloride ([Bmim]Cl) were prepared to immobilized papain molecules. It is found that regenerated cellulose (RC) membranes was the best pattern for papain loading and immobilization. Removing the supernatant of the solution containing free enzyme as well as RC carriers before immobilization without the addition of ethanol as the precipitant were benefit for increasing the activity of the immobilized papain. Papain could be immobilized successfully on the surface of RC carriers through SEM analysis.
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7

Takahashi, Nobuyuki, Hideo Hata e Kazuyuki Kuroda. "Exfoliation of Layered Silicates through Immobilization of Imidazolium Groups". Chemistry of Materials 23, n. 2 (25 gennaio 2011): 266–73. http://dx.doi.org/10.1021/cm102942s.

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8

Passos, Marieta L. C., Emília Sousa e M. Lúcia M. F. S. Saraiva. "Immobilized imidazolium-based ionic liquids in C18 for solid-phase extraction". Analyst 145, n. 7 (2020): 2701–8. http://dx.doi.org/10.1039/c9an02479d.

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9

Zhao, Cuifang, Baozeng Ren, Yuting Song, Junling Zhang, Lingchao Wei, Shimou Chen e Suojiang Zhang. "Immobilization and molecular rearrangement of ionic liquids on the surface of carbon nanotubes". RSC Adv. 4, n. 31 (2014): 16267–73. http://dx.doi.org/10.1039/c4ra00569d.

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Two kinds of imidazolium ionic liquids with different weight ratios were absorbed on the outer surface of MWCNTs. The orientational order and properties of ILs immobilized on the MWCNTs' surfaces were analyzed.
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10

Yuan, Ya Mei, Qiu Jin Li, Song Kun Yao, Wei Zhang e Jian Fei Zhang. "Immobilization of Papain on Regenerated Cellulose from Ionic Liquids". Applied Mechanics and Materials 448-453 (ottobre 2013): 1651–55. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.1651.

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Films and beads of cellulose regenerated from room temperature ionic liquid 1-butyl-3-methyl imidazolium chloride ([BmiCl) were prepared. In this work, regenerated cellulose (RC) films and beads were modified with NaIO4, and then papain was immobilized. The immobilized enzyme activities of RC carriers were determinated by BAEE (N-benzoyl-DL-arginine ethyl ester hydrochloride) method. According to the experiments, 5.0mg/mL of free papain was fixed to obtain the immobilized enzyme with high activity. Moreover, high content of cellulose regenerated from ILs (<saturated content) was benefit to achieve high activity of enzyme after immobilization.
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11

Ramenskaya, L. M., E. P. Grishina e O. V. Kraeva. "Immobilization of imidazolium cation based ionic liquids on thin polymer films". Russian Journal of General Chemistry 82, n. 4 (aprile 2012): 749–55. http://dx.doi.org/10.1134/s107036321204024x.

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12

Consorti, Crestina S., Guilherme L. P. Aydos, Günter Ebeling e Jaırton Dupont. "On the Immobilization of Ruthenium Metathesis Catalysts in Imidazolium Ionic Liquids". Organometallics 28, n. 15 (10 agosto 2009): 4527–33. http://dx.doi.org/10.1021/om900376c.

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13

Yao, Song Kun, Qiu Jin Li, Wei Zhang, Ji Xian Gong e Jian Fei Zhang. "Ionic Liquid-Regenerated Cellulose Beads as Solid Support Matrices for Papain Immobilization". Advanced Materials Research 535-537 (giugno 2012): 2349–52. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.2349.

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A beads based on cellulose and the room temperature ionic liquid 1-butyl-3-methyl imidazolium chloride ([Bmim]Cl) was prepared. Regenerated cellulose beads were modified with silane, and characterized by scanning electron microscopy. Papain was immobilized on the beads used two different methods including glutaraldehyde and covalent cross-linking method. The immobilized enzyme activity of bead was determinated by BAEE (N-benzoyl- DL-arginine ethyl ester hydrochloride) determination. According to the enzyme activity and immobilization rate compared with covalent cross-linking method, glutaraldehyde cross-linking method is more suitable for amino-modified.
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14

Zhang, Qian, Ling Zhang, Jin Zhong Zhang e Jinghong Li. "Preparation of 1-Propyl-3-Methyl-Imidazolium Chloride Functionalized Organoclay for Protein Immobilization". Science of Advanced Materials 1, n. 1 (1 aprile 2009): 55–62. http://dx.doi.org/10.1166/sam.2009.1008.

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15

Wang, Lei, Sankaranarayanapillai Shylesh, Daniel Dehe, Thomas Philippi, Gunder Dörr, Andreas Seifert, Zhou Zhou et al. "Covalent Immobilization of Imidazolium Cations Inside a Silica Support: Palladium-Catalyzed Olefin Hydrogenation". ChemCatChem 4, n. 3 (20 gennaio 2012): 395–400. http://dx.doi.org/10.1002/cctc.201100329.

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16

Jastram, Ann, Tobias Lindner, Christian Luebbert, Gabriele Sadowski e Udo Kragl. "Swelling and Diffusion in Polymerized Ionic Liquids-Based Hydrogels". Polymers 13, n. 11 (1 giugno 2021): 1834. http://dx.doi.org/10.3390/polym13111834.

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Hydrogels are one of the emerging classes of materials in current research. Besides their numerous applications in the medical sector as a drug delivery system or in tissue replacement, they are also suitable as irrigation components or as immobilization matrices in catalysis. For optimal application of these compounds, knowledge of the swelling properties and the diffusion mechanisms occurring in the gels is mandatory. This study is focused on hydrogels synthesized by radical polymerization of imidazolium-based ionic liquids. Both the swelling and diffusion behavior of these hydrogels were investigated via gravimetric swelling as well as sorption experiments implemented in water, ethanol, n-heptane, and tetrahydrofuran. In water and ethanol, strong swelling was observed while the transport mechanism deviated from Fickian-type behavior. By varying the counterion and the chain length of the cation, their influences on the processes were observed. The calculation of the diffusion coefficients delivered values in the range of 10−10 to 10−12 m2 s−1. The gravimetric results were supported by apparent diffusion coefficients measured through diffusion-weighted magnetic resonance imaging. A visualization of the water diffusion front within the hydrogel should help to further elucidate the diffusion processes in the imidazolium-based hydrogels.
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17

Wang, Jing, Yongcun Zou, Yu Sun, Maximilian Hemgesberg, Dirk Schaffner, Hongcheng Gao, Xiaojing Song, Wenxiang Zhang, Mingjun Jia e Werner R. Thiel. "Electrostatic immobilization of phosphomolybdic acid on imidazolium-based mesoporous organosilicas for catalytic olefin epoxidation". Chinese Journal of Catalysis 35, n. 4 (aprile 2014): 532–39. http://dx.doi.org/10.1016/s1872-2067(14)60025-5.

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18

Tengku Azmi, Tengku Sharifah Marliza, Mohd Ambar Yarmo, Azizul Hakim, Maratun Najiha Abu Tahari e Yun Hin Taufiq-Yap. "Immobilization and Characterizations of Imidazolium-Based Ionic Liquid on Silica for CO2 Adsorption/Desorption Studies". Materials Science Forum 840 (gennaio 2016): 404–9. http://dx.doi.org/10.4028/www.scientific.net/msf.840.404.

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Supported imidazolium-based ionic liquids (ILs) were developed for adsorption/desorption studies of carbon dioxide. ILs could be easily immobilized into silica support materials using sol-gel method. The developed materials were successfully characterized using XRD, TGA, DTA, and BET analysis. The CO2 adsorption/desorption measurement were carried out using temperature-program-desorption technique and proved that the supported ILs on silica could reduced the temperature of CO2 desorption from 750 to 390 °C. The best performance for CO2 sorption (1.17 mmol CO2/g adsorbent) was achieved with 1-ethyl-3-methylimidazolium hydrogensulfate [EMIm][HSO4]-silica system.
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19

Moura, Nuno M. M., Xavier Moreira, Eliana Sousa Da Silva, Joaquim Luís Faria, Maria G. P. M. S. Neves, Adelaide Almeida, Maria A. F. Faustino e Ana T. P. C. Gomes. "Efficient Strategies to Use β-Cationic Porphyrin-Imidazolium Derivatives in the Photoinactivation of Methicillin-Resistant Staphylococcus aureus". International Journal of Molecular Sciences 24, n. 21 (4 novembre 2023): 15970. http://dx.doi.org/10.3390/ijms242115970.

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Bacterial resistance to antibiotics is a critical global health issue and the development of alternatives to conventional antibiotics is of the upmost relevance. Antimicrobial photodynamic therapy (aPDT) is considered a promising and innovative approach for the photoinactivation of microorganisms, particularly in cases where traditional antibiotics may be less effective due to resistance or other limitations. In this study, two β-modified monocharged porphyrin-imidazolium derivatives were efficiently incorporated into polyvinylpyrrolidone (PVP) formulations and supported into graphitic carbon nitride materials. Both porphyrin-imidazolium derivatives displayed remarkable photostability and the ability to generate cytotoxic singlet oxygen. These properties, which have an important impact on achieving an efficient photodynamic effect, were not compromised after incorporation/immobilization. The prepared PVP-porphyrin formulations and the graphitic carbon nitride-based materials displayed excellent performance as photosensitizers to photoinactivate methicillin-resistant Staphylococcus aureus (MRSA) (99.9999% of bacteria) throughout the antimicrobial photodynamic therapy. In each matrix, the most rapid action against S. aureus was observed when using PS 2. The PVP-2 formulation needed 10 min of exposure to white light at 5.0 µm, while the graphitic carbon nitride hybrid GCNM-2 required 20 min at 25.0 µm to achieve a similar level of response. These findings suggest the potential of graphitic carbon nitride-porphyrinic hybrids to be used in the environmental or clinical fields, avoiding the use of organic solvents, and might allow for their recovery after treatment, improving their applicability for bacteria photoinactivation.
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20

Liu, Yusheng, Guozhong Wu, Haiying Fu, Zheng Jiang, Shimou Chen e Maolin Sha. "Immobilization and melting point depression of imidazolium ionic liquids on the surface of nano-SiOx particles". Dalton Transactions 39, n. 13 (2010): 3190. http://dx.doi.org/10.1039/b924042j.

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21

Zhang, Mengyue, Fan Yang, Nan Wang, Jifu Du, Juntao Yan, Ya Sun, Manman Zhang e Long Zhao. "Ultra-Fast Removal of CBB from Wastewater by Imidazolium Ionic Liquids-Modified Nano-Silica". Molecules 30, n. 1 (25 dicembre 2024): 24. https://doi.org/10.3390/molecules30010024.

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The efficient removal of dyes is of significant importance for environmental purification and human health. In this study, a novel material (Si-MPTS-IL) has been synthesized by the immobilization of imidazole ionic liquids (ILs) onto nano-silica using the radiation grafting technique. The adsorption performance of Si-MPTS-IL for Coomassie Brilliant Blue (CBB) removal is studied by a series of static adsorption experiments. It is found that Si-MPTS-IL has ultra-fast adsorption kinetics, reaching equilibrium within 2 min. The adsorption process for CBB conforms to the Langmuir model. In addition, Si-MPTS-IL exhibits a negligible impact on the adsorption efficiency of CBB with the increase in salt concentration. After six cycles of adsorption–desorption, the adsorption efficiency of Si-MPTS-IL remained above 80%, indicating excellent regenerative properties and a promising candidate for the treatment of wastewater containing CBB. A study of the mechanism indicates that the CBB capture by Si-MPTS-IL can be attributed to the synergistic effects of electrostatic interactions and pore filling.
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22

S. Aquino, Aline, Michele O. Vieira, Ana Sofia D. Ferreira, Eurico J. Cabrita, Sandra Einloft e Michèle O. de Souza. "Hybrid Ionic Liquid–Silica Xerogels Applied in CO2 Capture". Applied Sciences 9, n. 13 (28 giugno 2019): 2614. http://dx.doi.org/10.3390/app9132614.

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The imidazolium-based ionic liquids (ILs) are solvents known for selectively solubilizing CO2 from a gas CH4/CO2 mixture, hence we have produced new hybrid adsorbents by immobilizing two ILs on xerogel silica to obtain a solid–gas system that benefits the ILs’ properties and can be industrially applied in CO2 capture. In this work, the ILs (MeO)3Sipmim.Cl and (MeO)3Sipmim.Tf2N were used at different loadings via the sol–gel process employing a based 1-methyl-3-(3-trimethoxysylilpropyl) imidazolium IL associated to the anion Cl− or Tf2N− as a reactant in the synthesis of silica xerogel. The CO2 adsorption measurements were conducted through pressure and temperature gravimetric analysis (PTGA) using a microbalance. SEM microscopies images have shown that there is an IL limit concentration that can be immobilized (ca. 20%) and that the xerogel particles have a spherical shape with an average size of 20 µm. The adsorbent with 20% IL (MeO)3Sipmim.Cl, SILCLX20, shows greater capacity to absorb CO2, reaching a value of 0.35 g CO2 / g adsorbent at 0.1 MPa (298 K). Surprisingly, the result for xerogel with IL (MeO)3Sipmim.Tf2N shows poor performance, with only 0.05 g CO2 / g absorbed, even having a hydrophobic character which would benefit their interaction with CO2. However, this hydrophobicity could interfere negatively in the xerogel synthesis process. The immobilization of ionic liquids in silica xerogel is an advantageous technique that reduces costs in the use of ILs as they can be used in smaller quantities and can be recycled after CO2 desorption.
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23

Gafiatullin, Bulat, Aigul Akchurina, Angelina Fedoseeva, Elza Sultanova, Daut Islamov, Konstantin Usachev, Vladimir Burilov, Svetlana Solovieva e Igor Antipin. "PEPPSI-Type Pd(II)—NHC Complexes on the Base of p-tert-Butylthiacalix[4]arene: Synthesis and Catalytic Activities". Inorganics 11, n. 8 (1 agosto 2023): 326. http://dx.doi.org/10.3390/inorganics11080326.

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The creation of effective catalytic systems for cross-coupling reactions, reduction, etc., capable of working in water-organic or pure aqueous media is in great demand. The article presents the synthesis of NHC-palladium complexes of the PEPPSI type based on monoimidazolium derivatives of thiacalix[4]arene. The structure of the imidazolium precursors, obtained in 81–88% yields and the complexes themselves, obtained in 40–50% yields, is established using modern methods, including X-ray structural analysis and high-resolution mass spectrometry. It is shown that the obtained complex with bulk substituents near the palladium atom is not inferior to the well-known PEPPSI-type Organ’s catalyst in the catalysis of Suzuki-Miyaura coupling and is four times superior to the latter in the p-nitrophenol reduction reaction. Given the presence of free phenolic hydroxyl groups in the macrocycle, the obtained complexes are of interest for further post-modification or for immobilization on a carrier.
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24

Pourjavadi, Ali, Niloofar Safaie, Seyed Hassan Hosseini e Craig Bennett. "Graphene oxide/poly(imidazole/imidazolium) nanocomposite: An effective support for immobilization of large amounts of Pd nanoparticles". Journal of Industrial and Engineering Chemistry 38 (giugno 2016): 82–92. http://dx.doi.org/10.1016/j.jiec.2016.04.009.

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25

Yavari, Khadijeh, Bagher Eftekhari-Sis e Ali Akbari. "Synthesis and Application of Silver and Cobalt Nanoparticles Immobilized on Ionic Liquid-Functionalized Halloysite Nanotubes in the Reduction of 4-Nitrophenol in Aqueous Solution". Nano 16, n. 08 (luglio 2021): 2150089. http://dx.doi.org/10.1142/s1793292021500892.

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4-nitrophenol (4-NP) is a highly toxic pollutant for aquatic ecosystem and human life. Therefore, the catalytic reduction of 4-NP into useful 4-aminophenol (4-AP) is of interest. In this regard, two heterogeneous nanocatalysts, including Ag@HNTs-ILs and Co@HNTs-ILs were prepared by grafting imidazolium-based ionic liquids (ILs) onto the halloysite nanotubes (HNTs), followed by immobilization of Ag and Co nanoparticles (NPs), and characterized by means of FT-IR, SEM, EDX, TEM and XRD. The catalytic activity of the prepared nanocatalysts was evaluated for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) under environmentally friendly condition. A set of time, temperature, nanocatalyst amount and NaBH4/4-NP molar ratios was screened. The reusability experiments demonstrated that Ag@HNTs-ILs and Co@HNTs-ILs were highly reusable, up to five reduction cycles without considerable changes in the reaction time. As the synthesized hybrid nanocatalysts could be re-collected and reused for various catalytic runs without any significant loss in their catalytic activity, they could be considered very promising nanomaterials from sustainability point of view.
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26

Zhu, Zhenghao, Ivan Popov, Alexei P. Sokolov e Stephen J. Paddison. "Mechanistic Insights into Ion Transport in Polymerized Ionic Liquids". ECS Meeting Abstracts MA2023-01, n. 45 (28 agosto 2023): 2456. http://dx.doi.org/10.1149/ma2023-01452456mtgabs.

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Polymerized ionic liquids (polyILs) continue to be of great interest as electrolytes in energy conversion and storage devices. However, challenges in enhancing the ionic conductivity to ~10-3 S/cm still hinder the application of these materials. Therefore, it is urgent to improve the conductivity in these electrolytes, which strongly relies on advances in molecular-level understanding of ion transport mechanisms governing charge transport. To this end, ionic correlations and the mechanisms of ion transport in the polyILs and their corresponding ILs have been systematically studied by altering the molecular chemistry of the cation and the anion using classical molecular dynamics simulations. We first hypothesized that immobilization of one of the ions in the polymer may lead to a significant increase in negative correlations in the dynamics of the mobile ions. To verify this hypothesis, we used a polymethylmethacrylate (PMMA) based backbone with attached imidazolium cations and mobile anions, including TFSI−, PF6 −, BF4 −, and Br−. The increase in temperature enhances both intrachain and interchain ion hopping while reducing the rattling of mobile ions. The analysis of ionic correlations in both ILs and polyILs systems at various temperatures revealed that the inverse Heaven ratio was not temperature dependent in either of the systems. We further investigated the effect of side-chain flexibility of polyILs on ionic correlations by changing the side-chain length. The higher flexibility enhances local mobility of the imidazolium cations, leading to an increasing number of associating cations from more polymer chains to the anions. Another key factor in tuning ionic correlations in concentrated ionic systems is electrostatic interactions, whose role was investigated by changing the dielectric constant of the simulated systems. We believe these molecular-level insights will advance the rational design of novel polyILs for electrochemical applications.
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27

Gizli, Nilay, e Merve Arabacı. "Enhanced sorption of Cu (II) ions from aqueous solution by ionic liquid impregnated nano-silica and nano-alumina particles". Chemical Industry and Chemical Engineering Quarterly 23, n. 2 (2017): 207–16. http://dx.doi.org/10.2298/ciceq160121034g.

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In this study, the improvement of the Cu (II) ion sorption performance of nano- -silica and nano-alumina particles was investigated by the impregnation of 1-ethyl-3-methyl imidazolium bis(trifluorosulfonyl)imide [Emim+Tf2N-] ionic liquid (IL). The immobilization process of IL was achieved via the ultrasound-assisted physical impregnation method. The structural and morphological characterization of the adsorbents was investigated by Fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM) analysis. The thermal stability of the ionic liquid impregnated nanoparticles was also characterized by thermogravimetric analysis (TGA). The effect of the loading ratio (LR) and the sonication time (tD) on the sorption performance of the modified nanoparticles were investigated. The efficient adsorption was obtained by using the particles containing IL at the loading ratio (mL-IL/g-part) of 0.5:1. And the optimum value for the sonication time was chosen as 15 min in ethanol media. The sorption performances of the nanoparticles were enhanced by impregnation up to 92% in the aqueous media. The sorption equilibrium behaviour of the modified nanoparticles was also evaluated. The experimental data indicated that the equilibrium behaviour was in line with the Langmuir sorption isotherms.
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Ochędzan-Siodłak, Wioletta, Katarzyna Dziubek e Krystyna Czaja. "Effect of immobilization of titanocene catalyst in aralkyl imidazolium chloroaluminate media on performance of biphasic ethylene polymerization and polyethylene properties". Polymer Bulletin 70, n. 1 (15 luglio 2012): 1–21. http://dx.doi.org/10.1007/s00289-012-0809-8.

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Pahlevanneshan, Zari, Majid Moghadam, Valiollah Mirkhani, Shahram Tangestaninejad, Iraj Mohammadpoor-Baltork e Ahmad R. Khosropour. "Immobilization of palladium(II)-containing bis(imidazolium) ligand on ion-exchange resins: efficient and reusable catalysts for CC coupling reactions". Applied Organometallic Chemistry 29, n. 6 (23 marzo 2015): 346–52. http://dx.doi.org/10.1002/aoc.3297.

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Zammillo, Federica, Hilmar Guzman, Daniela Polino, Roger Miro Serra, Alberto Lopera, Emmanuele Parisi, Elena Simone et al. "Assessing the Activity and Stability of Cu-Based Gas Diffusion Electrodes for the CO2 Conversion in Different Electrolytes: Bicarbonate Vs. Ionic Liquid/Acetonitrile". ECS Meeting Abstracts MA2024-01, n. 37 (9 agosto 2024): 2175. http://dx.doi.org/10.1149/ma2024-01372175mtgabs.

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In the context of sustainable strategies proposed to convert CO2 to valuable products, the electrochemical reduction of CO2 (ECR-CO2) represents one of the most promising alternatives1. Herein, the ECR-CO2 has been carried out employing for the first-time synthesised core-shell Cu2O/SnO2-based nanoparticles within a continuous flow cell both in aqueous solution and in the presence of ionic liquids (ILs), which have been known to boost CO2-derived products2. Interestingly, in aqueous potassium bicarbonate-based electrolyte, the synthesised material demonstrated a stable syngas production at -20 mA cm-2, with a CO/H2 ratio of about 10. The electrode stability and selectivity in aqueous environment has been further demonstrated for 24 hours of continuous operations at 10 cm2 scale. However, a CO/H2 ratio of about 3 was reached with 1-Butyl-3-methylimidazolium triflate ([BMIM][TfO]) in acetonitrile (ACN)3. In the aprotic media, stability issues have been faced during operations, visualized in the darkening of the gas diffusion electrodes and in colour changes of the electrolyte. Raman spectroscopy, Field Emission Scanning Electron Microscopy and Electrochemical Impedance Spectroscopy techniques have been employed for the physicochemical characterization of the electrodes and to assess the evolution of the electrochemical interfaces within the system over time. Molecular dynamics simulations have shown that the instability of the GDE could start with the displacement of Cu surface atoms from their equilibrium position by ACN molecules. Furthermore, we observed that the immobilization of ruthenium and rhenium complexes on the catalyst can be crucial to determine its suitability for either the hydroformylation or the carbonylation reaction, making this technology a promising solution for the green transition of the chemical industry. Acknowledgments The financial support of the SUNCOCHEM project (Grant Agreement No 862192) of the European Union’s Horizon 2020 Research and Innovation Action programme and of Fondazione CRT are acknowledged. References IEA. Global Energy Review: CO2 Emissions in 2021. (2021). Kunene, T., Atifi, A. & Rosenthal, J. Selective CO2 Reduction over Rose’s Metal in the Presence of an Imidazolium Ionic Liquid Electrolyte. ACS Appl. Energy Mater. 3, 4193–4200 (2020). Fortunati, A., Hernández, S., et al. Understanding the role of imidazolium-based ionic liquids in the electrochemical CO2 reduction reaction. Communications Chemistry, 6(1), 1–13 (2023).
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31

Wang, Zhike, Honglian Ge, Xueyuan Wang, Cunling Ye e Shunli Fan. "Mono and co-immobilization of imidazolium ionic liquids on silica: effects of the substituted groups on the adsorption behavior of 2,4-dinitrophenol". RSC Advances 9, n. 56 (2019): 32425–34. http://dx.doi.org/10.1039/c9ra07635b.

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Abstract (sommario):
Ionic liquid modified silicas with high adsorption capacity for phenols prompt us to deeply explore the contribution of interactions between the adsorbent and adsorbate, with a particular focus on hydrophobicity, π–π, electrostatic and acid–base interactions.
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32

Sugimura, Rie, Kun Qiao, Daisuke Tomida, Yohei Kume e Chiaki Yokoyama. "Immobilization of Palladium Acetate on Ionic Liquid Copolymerized Polystyrene: A Way to Eliminate Inhibiting Effect of Imidazolium Chloride and Enhance Catalytic Performance". Chemistry Letters 36, n. 7 (5 luglio 2007): 874–75. http://dx.doi.org/10.1246/cl.2007.874.

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Moghadam, Majid, Hossein Salavati e Zari Pahlevanneshan. "Immobilization of a palladium(II) bis(imidazolium) complex onto graphene oxide by noncovalent interactions: an efficient and recyclable catalyst for Suzuki–Miyaura reaction". Journal of the Iranian Chemical Society 15, n. 3 (15 dicembre 2017): 529–36. http://dx.doi.org/10.1007/s13738-017-1253-3.

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34

Pahlevanneshan, Zari, Majid Moghadam, Valiollah Mirkhani, Shahram Tangestaninejad, Iraj Mohammadpoor-Baltork e Ahmad R. Khosropour. "ChemInform Abstract: Immobilization of Palladium(II)-Containing Bis(imidazolium) Ligand on Ion-Exchange Resins: Efficient and Reusable Catalysts for C-C Coupling Reactions." ChemInform 46, n. 36 (20 agosto 2015): no. http://dx.doi.org/10.1002/chin.201536057.

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35

Karimi, Babak, Dawood Elhamifar, Omolbanin Yari, Mojtaba Khorasani, Hojatollah Vali, James H. Clark e Andrew J. Hunt. "Synthesis and Characterization of Alkyl-Imidazolium-Based Periodic Mesoporous Organosilicas: A Versatile Host for the Immobilization of Perruthenate (RuO4−) in the Aerobic Oxidation of Alcohols". Chemistry - A European Journal 18, n. 42 (3 settembre 2012): 13520–30. http://dx.doi.org/10.1002/chem.201200380.

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36

Karimi, Babak, Dawood Elhamifar, Omolbanin Yari, Mojtaba Khorasani, Hojatollah Vali, James H. Clark e Andrew J. Hunt. "ChemInform Abstract: Synthesis and Characterization of Alkyl-Imidazolium-Based Periodic Mesoporous Organosilicas: A Versatile Host for the Immobilization of Perruthenate (RuO4-) in the Aerobic Oxidation of Alcohols." ChemInform 44, n. 13 (18 marzo 2013): no. http://dx.doi.org/10.1002/chin.201313023.

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37

Winand, Lea, Stefanie Theisen, Stephan Lütz, Katrin Rosenthal e Markus Nett. "Immobilization of the Amidohydrolase MxcM and Its Application for Biocatalytic Flow Synthesis of Pseudochelin A". Catalysts 13, n. 2 (18 gennaio 2023): 229. http://dx.doi.org/10.3390/catal13020229.

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Abstract (sommario):
The chemical synthesis of heterocycles typically requires elevated temperature and acid or base addition to form the desired product. Moreover, these reactions often involve hazardous reagents, which is why biocatalytic routes for heterocycle formation have gained increasing attention. In recent years, several enzymes belonging to the amidohydrolase superfamily have been identified to generate heterocycles via cyclocondensation reactions. Of particular interest is the amidohydrolase MxcM, which catalyzes the formation of an imidazoline moiety in the biosynthesis of the anti-inflammatory natural product pseudochelin A. In this study, we present a concept for the immobilization of this enzyme using a fused hexahistidine tag for fixation onto a solid, porous carrier. Notably, the immobilization improves the enzyme’s tolerance to organic solvents. The immobilized MxcM exhibits a residual activity of 169% in the polar solvent acetonitrile compared to the free enzyme, and the storage stability in the presence of 20 vol% acetonitrile was ameliorated. In addition, an immobilized enzyme reactor (IMER) was designed that can be operated under flow conditions. The MxcM-IMER retains its biocatalytic activity and mechanic stability over the tested operation time. These results provide important insights for the integration of heterocycle-forming amidohydrolases in chemical processes.
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38

Chahkamali, Farhad Omarzehi, Sara Sobhani e Jose Miguel Sansano. "A novel base-metal multifunctional catalyst for the synthesis of 2-amino-3-cyano-4H-chromenes by a multicomponent tandem oxidation process". Scientific Reports 12, n. 1 (21 febbraio 2022). http://dx.doi.org/10.1038/s41598-022-06759-7.

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AbstractA novel base-metal multifunctional nanomagnetic catalyst is prepared by the immobilization of tungstate anions onto γ-Fe2O3 supported with imidazolium moieties. The (γ-Fe2O3-Im-Py)2WO4 was fully characterized using FT-IR, XPS, TEM, FESEM, ICP, TGA, VSM and XRD and used as a multifunctional heterogeneous catalyst for the synthesis of 2-amino-3-cyano-4H-chromenes via a multicomponent tandem oxidation process starting from alcohols under solvent-free conditions. During this process, tungstate catalyzes the oxidation of a wide range of alcohols in the presence of TBHP as a clean source. The in-situ formed aldehydes are condensed with malononitrile and β-dicarbonyl compounds/naphthols/4-hydroxycumarin through promotion by pyridine and imidazolium moieties of the catalyst. By this method, a variety of 2-amino-3-cyano-4H-chromenes are generated in good to high yields from alcohols as inexpensive and easily available starting materials. The catalyst is recovered easily by the aid of an external magnetic field and reused in five successive runs with insignificant decreasing activity.
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Wu, Yue, Long Ma, Zhixin Song, Shu Dong, Zengjing Guo, Jun Wang e Yu Zhou. "Ordered mesoporous carbon encapsulated linear poly(ionic liquid)s enabling synergy effect of surface groups and ionic moieties for CO2 fixation under mild conditions". Carbon Neutrality 2, n. 1 (3 gennaio 2023). http://dx.doi.org/10.1007/s43979-022-00041-5.

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Abstract (sommario):
AbstractCarbon dioxide (CO2) fixation into value-added chemicals has attracted growing attention and one promising atom-efficient pathway is via the cycloaddition with three member-ring compounds like epoxides. Herein, we demonstrated that encapsulation of linear poly(ionic liquid)s (PILs) on ordered mesoporous carbon materials provides a facile and feasible approach towards environmental-friendly heterogeneous catalysts with high performance in CO2 cycloaddition with epoxides under mild conditions. A series of novel linear phenolic hydroxyl group functional imidazolium-based PILs synthesized from hydroxymethylation reaction between 4-(imidazol-1-yl)phenol-1-butyl-imidazolium iodide and formaldehyde was loaded on ordered mesoporous carbon FDU-15–600 derived from mesoporous phenolic resin. By virtue of controlling the initial polymerization temperature, the molecular weight of PILs was facilely modulated, reaching strong host–guest interaction during the PIL immobilization. Highly stable immobilized PIL species with spatial satisfaction of ionic moieties and surface groups were thus realized to enable a synergic CO2 conversion via cycloaddition with epoxides. The optimal catalyst exhibited high yield and stable recyclability by using atmospheric CO2 under metal-additive-solvent-free conditions and the activity surprisingly exceeded the corresponding homogeneous parent IL and PIL. Excellent substrate compatibility was found by extending the transformation of more than ten epoxides including the inert ones such as disubstituted cyclohexene oxide. The significantly enhanced activity is attributed to the synergistic effect of the surface hydrogen groups and ionic moieties to accelerate the rate-determining ring-opening process.
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"Immobilization of Imidazolium Hydrogen Sulphate on Silica as Efficient Ionic Liquid for Catalytic Acetylization of Glycerol". International Journal of Applied Chemistry 5, n. 3 (25 dicembre 2018). http://dx.doi.org/10.14445/23939133/ijac-v5i3p102.

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41

Kumar Chopra, Harish, Ayushi Aggarwal e Avtar Singh. "Merrifield Resin Supported Ionic Liquids: Catalytic Applications in Organic Synthesis". Current Organic Chemistry 27 (6 aprile 2023). http://dx.doi.org/10.2174/1385272827666230406082857.

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Abstract (sommario):
Abstract: Ever since their discovery, Ionic Liquids have raised great interest in organic transformations ranging from solvents to catalytic entities. These belong to a class of nonmolecular compounds composed of ions having curiously low melting points. In the last few years, the Supported Ionic Liquids have drawn the attention of researchers and chemists due to their advantages over homogeneous catalysis. The most commonly used support for immobilized ionic liquids is polymeric. Due to its efficient recovery, reusability and chemical inertness, Merrifield resin can be considered an excellent solid support for ionic liquids. The present review summarizes the synthesis and application of Merrifield Resin Supported Ionic Liquids (MRSILs). The MRSILs can be synthesized by the immobilization of amines like ammonium, choline, imidazolium, DABCO, DMAP, pyridine, and many other functionalized precursors. Additionally, these MRSILs play an incredible role in the field of catalysis, where both metal-free and metal-containing MRSILs are embodied as a catalyst.
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42

Abedanzadeh, Sedigheh, Shohreh Ariaeenejad, Babak Karimi e Ali A. Moosavi-Movahedi. "Revolutionizing protein hydrolysis in wastewater: Innovative immobilization of metagenome-derived protease in periodic mesoporous organosilica with imidazolium framework". International Journal of Biological Macromolecules, agosto 2024, 134966. http://dx.doi.org/10.1016/j.ijbiomac.2024.134966.

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Cheng, Yaohui, Xin Zhang, Chunchun Yin, Jinming Zhang, Jian Yu e Jun Zhang. "Immobilization of Ionic Liquids with a New Cellulose Ester Containing Imidazolium Cation for High‐Performance CO 2 Separation Membranes". Macromolecular Rapid Communications, 18 novembre 2020, 2000494. http://dx.doi.org/10.1002/marc.202000494.

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44

Elgoud, Elsayed Mustafa Abu, Ahmed Ibrahim Abd-Elhamid e Hisham Fouad Aly. "Modification of graphene oxide with imidazolium-based ionic liquid for significant sorption of La(III) and Pr(III) from aqueous solutions". Applied Water Science 13, n. 7 (12 giugno 2023). http://dx.doi.org/10.1007/s13201-023-01955-w.

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Abstract (sommario):
AbstractA straightforward ferrocyanide immobilization on the surface of graphene oxide (GO) was conducted for rapid and efficient adsorption capacity for lanthanum and praseodymium from an aqueous solution. The GO was mixed with 1-methyl imidazole in the presence of epichlorohydrin to form GO-imidazole-Cl and thereafter suspended in a potassium ferrocyanide solution to fabricate GO-imidazole-FeCN. The prepared materials were characterized with different advanced techniques confirming the preparation method. The adsorption ability of GO-imidazole-FeCN towards La(III) and Pr(III) ions was evaluated. Moreover, the adsorption isotherm showed that the sorption process was fitted with the Langmuir isotherm model with a considerable maximum adsorption capacity of 781.25 mg g−1 for La(III) and 862.07 mg g−1 for Pr(III). The thermodynamic studies showed that the adsorption of both metal ions was spontaneous and endothermic. In addition, the adsorbent showed excellent adsorption–desorption behavior over 5 times, suggesting that GO-imidazole-FeCN may be considered a potential candidate for La(III) and Pr(III) removal from different metal ions which present in fission products.
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45

Sugimura, Rie, Kun Qiao, Daisuke Tomida, Yohei Kume e Chiaki Yokoyama. "Immobilization of Palladium Acetate on Ionic Liquid Copolymerized Polystyrene: A Way to Eliminate Inhibiting Effect of Imidazolium Chloride and Enhance Catalytic Performance." ChemInform 38, n. 50 (11 dicembre 2007). http://dx.doi.org/10.1002/chin.200750029.

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46

Seidl, Vera, Angel H. Romero, Frank W. Heinemann, Andreas Scheurer, Carola S. Vogel, Tobias Unruh, Peter Wasserscheid e Karsten Meyer. "A New Class of Task‐Specific Imidazolium Salts and Ionic Liquids and Their Corresponding Transition‐Metal Complexes for Immobilization on Electrochemically Active Surfaces". Chemistry – A European Journal 28, n. 20 (14 marzo 2022). http://dx.doi.org/10.1002/chem.202200100.

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Seidl, Vera, Angel H. Romero, Frank W. Heinemann, Andreas Scheurer, Carola S. Vogel, Tobias Unruh, Peter Wasserscheid e Karsten Meyer. "Cover Feature: A New Class of Task‐Specific Imidazolium Salts and Ionic Liquids and Their Corresponding Transition‐Metal Complexes for Immobilization on Electrochemically Active Surfaces (Chem. Eur. J. 20/2022)". Chemistry – A European Journal 28, n. 20 (19 marzo 2022). http://dx.doi.org/10.1002/chem.202200812.

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