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Jin HF, Shi Y, Jiao YH, Cao J. Separation and determination of phenolic compounds using novel deep eutectic solvent-in-water microemulsion electrokinetic chromatography. Anal Chim Acta 2024; 1297:342359. [PMID: 38438236 DOI: 10.1016/j.aca.2024.342359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 01/13/2024] [Accepted: 02/06/2024] [Indexed: 03/06/2024]
Abstract
BACKGROUND Microemulsion electrokinetic chromatography (MEEKC) is a mode of capillary electrophoresis with a wide range of applications in which microemulsion is utilized as background electrolyte to achieve the separation of analytes. Microemulsions are composed of oil droplets, aqueous buffer, surfactant, and co-surfactant. Currently, conventional organic reagents act as the most commonly used oil phase in microemulsions, which are unfriendly to the environment. Recently, deep eutectic solvent (DES) has become a new type of eco-friendly solvent due to its non-toxicity. Therefore, it is of great value to establish a new MEEKC method by replacing conventional organic reagents as the oil phase with DES. RESULTS The novel DES/W MEEKC method was established for phenolic compounds in Senecio scandens samples. Single-factor experiments and response surface methodology were performed to systematically optimize the crucial parameters for the method, including the type and content of the oil phase, surfactant content, concentration of borax buffer, and pH of the background solution. Under the optimized conditions, satisfactory regression curves were established for all standard analytes with correlation coefficients ≥0.9990. The method featured high sensitivity and favorable accuracy, with the instrumental detection limit in the range of 0.22-1.04 μg/mL, and intraday and interday precision for migration time expressed as relative standard deviations of 0.18-0.82% and 1.25-2.50%, respectively. The DES/W MEEKC method was successfully applied to Senecio scandens with good recoveries of 87.72-106.99%. In conclusion, the newly established DES/W MEEKC method is highly efficient, green and environmentally friendly. SIGNIFICANCE DES is considered a green and efficient solvent. The DES/W MEEKC method is highly efficient and environmentally friendly. Actually, the method provides a novel and effective analytical tool for the simultaneous separation and determination of multiple phenolic compounds, especially in complex plant matrices. In the future, the DES/W MEEKC method still has the prospect of being widely used in the separation of other complex phytochemicals.
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Affiliation(s)
- Huang-Fei Jin
- College of Material Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, China
| | - Ying Shi
- College of Material Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, China
| | - Yan-Hua Jiao
- College of Material Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, China
| | - Jun Cao
- College of Material Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, China.
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Nguyen PN, Nguyen LHT, Doan TLH, Tran PH, Nguyen HT. A eutectogels-catalyzed one-pot multi-component reaction: access to pyridine and chromene derivatives. RSC Adv 2024; 14:7006-7021. [PMID: 38414994 PMCID: PMC10897536 DOI: 10.1039/d4ra00123k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Accepted: 02/23/2024] [Indexed: 02/29/2024] Open
Abstract
The demand for a wide array of functional chemicals and materials has experienced a significant surge in tandem with the advancement of civilization. Regrettably, a number of perilous solvents are employed in chemical laboratories and industrial settings, posing significant risks to the well-being of researchers and contributing to environmental degradation through pollution. Eutectogels, which are based on the eutectic concept, may be synthesized by self-assembling or self-polymerization of various components when put under UV irradiation (254 nm). A novel copolymeric deep eutectic solvent (DES) was successfully synthesized, comprising choline chloride (HBA) as the hydrogen bond acceptor, acetamide (HBD) as the hydrogen bond donor, tetraethyl orthosilicate (TEOS), and formic acid. In this study, we present the preparation of four-component ETGs for synthesizing pyridine and chromene derivatives as a reusable catalyst through a multi-component pathway without solvents. The procedure of synthesizing these heterocyclic compounds is free of using toxic solvents and it could be categorized as a green method.
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Affiliation(s)
- Phat Ngoc Nguyen
- Department of Organic Chemistry, Faculty of Chemistry, University of Science Ho Chi Minh City 700000 Vietnam
- Vietnam National University Ho Chi Minh City 700000 Vietnam
| | - Linh Ho Thuy Nguyen
- Vietnam National University Ho Chi Minh City 700000 Vietnam
- Center for Innovative Materials and Architectures, Vietnam National University Ho Chi Minh City 721337 Vietnam
| | - Tan Le Hoang Doan
- Vietnam National University Ho Chi Minh City 700000 Vietnam
- Center for Innovative Materials and Architectures, Vietnam National University Ho Chi Minh City 721337 Vietnam
| | - Phuong Hoang Tran
- Department of Organic Chemistry, Faculty of Chemistry, University of Science Ho Chi Minh City 700000 Vietnam
- Vietnam National University Ho Chi Minh City 700000 Vietnam
| | - Hai Truong Nguyen
- Department of Organic Chemistry, Faculty of Chemistry, University of Science Ho Chi Minh City 700000 Vietnam
- Vietnam National University Ho Chi Minh City 700000 Vietnam
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Sheikh A, Khan AY, Ahmed S. Physicochemical Properties of Choline Chloride/Acetic Acid as a Deep Eutectic Solvent and Its Binary Solutions with DMSO at 298.15 to 353.15 K. ACS OMEGA 2024; 9:3730-3745. [PMID: 38284059 PMCID: PMC10809710 DOI: 10.1021/acsomega.3c07739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 12/11/2023] [Accepted: 12/18/2023] [Indexed: 01/30/2024]
Abstract
Deep eutectic solvents (DESs) are considered to play an important role in green chemistry and other technological fields as an alternative to organic solvents. The present study reports measurements of density (ρ), speed of sound (u), dynamic viscosity (η), and electrical conductivity (κ) and investigates physicochemical properties of choline chloride/acetic acid (ChCl/AcA DES) and its binary mixtures with dimethyl sulfoxide (DMSO) over the entire composition and temperature (298.15-353.15 K) range. The density data are well fitted by a second-degree polynomial equation in T. DES/DMSO mixtures exhibit negative excess molar volume and isentropic compressibility deviation with a minimum in respective curves at x1 ≈ 0.15 (x1 is the mole fraction of DES in the mixture), which became deeper with increasing temperature. The ChCl/AcA DES and DMSO curves for excess partial molar volume cross each other at x1 ≈ 0.15, showing that the packing effect is dominant over specific interactions. A similar behavior is observed for excess molar viscosity, showing the minima at x1 ≈ 0.62, and substantiates volumetric results. The temperature dependence of viscosity and conductivity is well described by the Vogel-Fulcher-Tammann (VFT) equation.
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Affiliation(s)
- Aafia Sheikh
- Department
of Chemistry, Government College Women University, Sialkot 51310, Pakistan
- Department
of Chemistry, Forman Christian College (A
Chartered University), Lahore 54600, Pakistan
| | - Athar Yaseen Khan
- Department
of Chemistry, Forman Christian College (A
Chartered University), Lahore 54600, Pakistan
| | - Safeer Ahmed
- Department
of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan
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Ferreira C, Sarraguça M. A Comprehensive Review on Deep Eutectic Solvents and Its Use to Extract Bioactive Compounds of Pharmaceutical Interest. Pharmaceuticals (Basel) 2024; 17:124. [PMID: 38256957 PMCID: PMC10820243 DOI: 10.3390/ph17010124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 01/04/2024] [Accepted: 01/16/2024] [Indexed: 01/24/2024] Open
Abstract
The extraction of bioactive compounds of pharmaceutical interest from natural sources has been significantly explored in recent decades. However, the extraction techniques used were not very efficient in terms of time and energy consumption; additionally, the solvents used for the extraction were harmful for the environment. To improve the environmental impact of the extractions and at the same time increase the extraction yields, several new extraction techniques were developed. Among the most used ones are ultrasound-assisted extraction and microwave-assisted extraction. These extraction techniques increased the yield and selectivity of the extraction in a smaller amount of time with a decrease in energy consumption. Nevertheless, a high volume of organic solvents was still used for the extraction, causing a subsequent environmental problem. Neoteric solvents appeared as green alternatives to organic solvents. Among the neoteric solvents, deep eutectic solvents were evidenced to be one of the best alternatives to organic solvents due to their intrinsic characteristics. These solvents are considered green solvents because they are made up of natural compounds such as sugars, amino acids, and carboxylic acids having low toxicity and high degradability. In addition, they are simple to prepare, with an atomic economy of 100%, with attractive physicochemical properties. Furthermore, the huge number of compounds that can be used to synthesize these solvents make them very useful in the extraction of bioactive compounds since they can be tailored to be selective towards a specific component or class of components. The main aim of this paper is to give a comprehensive review which describes the main properties, characteristics, and production methods of deep eutectic solvents as well as its application to extract from natural sources bioactive compounds with pharmaceutical interest. Additionally, an overview of the more recent and sustainable extraction techniques is also given.
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Affiliation(s)
| | - Mafalda Sarraguça
- LAQV, REQUIMTE, Department of Chemical Sciences, Laboratory of Applied Chemistry, Faculty of Pharmacy, Porto University, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal;
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Manyoni L, Redhi G. Separation potential of 1,5-pentanediol-based deep eutectic solvent: Infinite dilution activity coefficients and excess thermodynamic data. Heliyon 2023; 9:e21516. [PMID: 38034612 PMCID: PMC10682540 DOI: 10.1016/j.heliyon.2023.e21516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 10/03/2023] [Accepted: 10/23/2023] [Indexed: 12/02/2023] Open
Abstract
In the present study, the new data of the infinite dilution activity coefficient for 32 different solutes in {1-ethyl-1-methylpyrrolidinium bromide +1,5-pentanediol}, [[EMPYR] Br + 1,5-PDO] DES, were measured using the gas liquid chromatography (GLC) method with pre-saturation of the helium gas. The list of selected solutes included alkanes, alkenes, alkynes, cycloalkanes, cycloalkenes, aromatics, ketones, alcohols, and water. Because the solvents were volatile at the temperatures used for measurements, pre-saturation was deemed necessary. The measurements were taken at temperatures T = (313.15-343.15) K and atmospheric pressure. Values of partial molar properties, i.e., enthalpy, entropy, and Gibbs free energy, were computed at a reference temperature of Tref = 333.15 K. Moreover, the values of capacity and selectivity relating to [[EMPYR] Br + 1,5-PDO] DES for different sets of binary systems that are normally problematic in the separation through solvent extraction or distillation were also computed. These include cyclohexane/benzene; acetone/methanol; and hexane/benzene. The obtained data in the present work was then compared to the literature data, at similar temperatures. Thus, the thermodynamical data is important for pre-selecting solvents for industrial purposes.
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Affiliation(s)
- Lindokuhle Manyoni
- Physical Chemistry Laboratories, Department of Chemistry, Durban University of Technology, Durban-4000, Berea, South Africa
- Chemical Thermodynamics and Separation Technology, Department of Chemical Engineering, Durban University of Technology, Durban-4000, Berea, KwaZulu-Natal, South Africa
| | - Gan Redhi
- Physical Chemistry Laboratories, Department of Chemistry, Durban University of Technology, Durban-4000, Berea, South Africa
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Cai YQ, Gao H, Song LM, Tao FY, Ji XY, Yu Y, Cao YQ, Tang SJ, Xue P. Optimization of green deep eutectic solvent (DES) extraction of Chenopodium quinoa Willd. husks saponins by response surface methodology and their antioxidant activities. RSC Adv 2023; 13:29408-29418. [PMID: 37818274 PMCID: PMC10561373 DOI: 10.1039/d3ra05949a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Accepted: 10/03/2023] [Indexed: 10/12/2023] Open
Abstract
Quinoa saponins have outstanding activity, and there are an increasing number of extraction methods, but there are few research programs on green preparation technology. The extraction conditions of quinoa saponins with deep eutectic solvents (DESs) were optimized by single-factor experiments combined with response surface methodology. The antioxidant capacity of saponins extracted by DESs and traditional methods was evaluated by the DPPH clearance rate, iron ion chelation rate and potassium ferricyanide reducing power. The results show that the optimal DES is choline chloride: 1,2-propylene glycol (1 : 1), and its water content is 40%. The optimal extraction conditions were as follows: the solid-to-solvent ratio was 0.05 g mL-1, the extraction time was 89 min, and the extraction temperature was 75 °C. Under these conditions, the extraction of quinoa saponins by DES was more effective than the traditional extraction methods. The saponins extracted by DES and traditional methods were analyzed by UPLC-MS, and five main saponins were identified. Quantitative analysis by HPLC-UV showed that Q1 (m/z = 971) and Q2 (m/z = 809) had higher contents of saponins. In vitro antioxidant experiments showed that all DES saponin extracts showed good antioxidant capacity. This study provides new insight into the development and utilization of quinoa saponins.
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Affiliation(s)
- Yu-Qing Cai
- School of Public Health, Weifang Medical University Shandong 261042 PR China
| | - Hui Gao
- School of Public Health, Weifang Medical University Shandong 261042 PR China
| | - Lin-Meng Song
- School of Public Health, Weifang Medical University Shandong 261042 PR China
| | - Fei-Yan Tao
- School of Public Health, Weifang Medical University Shandong 261042 PR China
| | - Xue-Ying Ji
- School of Public Health, Weifang Medical University Shandong 261042 PR China
| | - Yuan Yu
- School of Public Health, Weifang Medical University Shandong 261042 PR China
| | - Yu-Qing Cao
- School of Public Health, Weifang Medical University Shandong 261042 PR China
| | - Shao-Jian Tang
- School of Pharmacy, Weifang Medical University Shandong 261042 PR China +86 0536-8462429
| | - Peng Xue
- School of Public Health, Weifang Medical University Shandong 261042 PR China
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Fan K, Yang B, Yu S, Yang R, Zhang L, Chi W, Yin M, Wu H, Guo J. Ternary choline chloride/benzene sulfonic acid/ethylene glycol deep eutectic solvents for oxidative desulfurization at room temperature. RSC Adv 2023; 13:25888-25894. [PMID: 37655352 PMCID: PMC10466083 DOI: 10.1039/d3ra02524a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2023] [Accepted: 06/05/2023] [Indexed: 09/02/2023] Open
Abstract
Deep eutectic solvents (DESs) have been extensively studied as promising green solvents to attain a better removal efficiency of sulfide. A new DES system formed from choline chloride (ChCl), benzene sulfonic acid (BSA), and ethylene glycol (EG) as a class of ternary DESs was prepared and used in the oxidative desulfurization (ODS) of different sulfides. Ternary DESs have distinct advantages such as volatility and high activity compared with organic acid-based binary DESs. Under the optimum conditions with VDES/VOil = 1 : 5, O/S (molar ratio of oxygen to sulfur) = 5, and T = 25 °C, the desulfurization efficiencies of dibenzothiophene (DBT), 4,6-dimethyldibenzothiophene (4,6-DMDBT), and benzothiophene (BT) were all achieved to 100% in 2 h. Through experimental and density functional theory (DFT) calculation methods, this new system as a class of ternary DESs shows good stability and excellent desulfurization performance at room temperature. The investigation of this study could supply a new idea of ternary DESs for oxidative desulfurization.
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Affiliation(s)
- Ke Fan
- Key Laboratory of Green Chemical Process of Ministry of Education, Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education, Hubei Key Laboratory of Novel Chemical Reactor and Green Chemical Technology, Wuhan Institute of Technology Wuhan 430073 P. R. China +86-27-87194980
| | - Biao Yang
- Key Laboratory of Green Chemical Process of Ministry of Education, Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education, Hubei Key Laboratory of Novel Chemical Reactor and Green Chemical Technology, Wuhan Institute of Technology Wuhan 430073 P. R. China +86-27-87194980
| | - Shanshan Yu
- Key Laboratory of Green Chemical Process of Ministry of Education, Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education, Hubei Key Laboratory of Novel Chemical Reactor and Green Chemical Technology, Wuhan Institute of Technology Wuhan 430073 P. R. China +86-27-87194980
| | - Rongguang Yang
- Key Laboratory of Green Chemical Process of Ministry of Education, Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education, Hubei Key Laboratory of Novel Chemical Reactor and Green Chemical Technology, Wuhan Institute of Technology Wuhan 430073 P. R. China +86-27-87194980
| | - Linfeng Zhang
- Key Laboratory of Green Chemical Process of Ministry of Education, Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education, Hubei Key Laboratory of Novel Chemical Reactor and Green Chemical Technology, Wuhan Institute of Technology Wuhan 430073 P. R. China +86-27-87194980
| | - Weijie Chi
- School of Science, Hainan University Haikou Hainan 570228 PR China
| | - Minghao Yin
- China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou 511370 Guangdong P. R. China
| | - Huadong Wu
- Key Laboratory of Green Chemical Process of Ministry of Education, Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education, Hubei Key Laboratory of Novel Chemical Reactor and Green Chemical Technology, Wuhan Institute of Technology Wuhan 430073 P. R. China +86-27-87194980
| | - Jia Guo
- Key Laboratory of Green Chemical Process of Ministry of Education, Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education, Hubei Key Laboratory of Novel Chemical Reactor and Green Chemical Technology, Wuhan Institute of Technology Wuhan 430073 P. R. China +86-27-87194980
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8
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Zarei N, Zolfigol MA, Torabi M, Yarie M. Synthesis of new hybrid pyridines catalyzed by Fe 3O 4@SiO 2@urea-riched ligand/Ch-Cl. Sci Rep 2023; 13:9486. [PMID: 37301889 DOI: 10.1038/s41598-023-35849-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2022] [Accepted: 05/24/2023] [Indexed: 06/12/2023] Open
Abstract
Herein, a new heterogeneous catalytic system through modification of urea functionalized magnetic nanoparticles with choline chloride [Fe3O4@SiO2@urea-riched ligand/Ch-Cl] was designed and synthesized. Then, the synthesized Fe3O4@SiO2@urea-riched ligand/Ch-Cl was characterized by using FT-IR spectroscopy, FESEM, TEM, EDS-Mapping, TGA/DTG and VSM techniques. After that, the catalytic usage of Fe3O4@SiO2@urea-riched ligand/Ch-Cl was investigated for the synthesis of hybrid pyridines with sulfonate and/or indole moieties. Delightfully, the outcome was satisfactory and the applied strategy represents several advantages such as short reaction times, convenience of operation and relatively good yields of obtained products. Moreover, the catalytic behavior of several formal homogeneous DESs was investigated for the synthesis of target product. In addition, a cooperative vinylogous anomeric-based oxidation pathway was suggested as rational mechanism for the synthesis of new hybrid pyridines.
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Affiliation(s)
- Narges Zarei
- Department of Organic Chemistry, Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran
| | - Mohammad Ali Zolfigol
- Department of Organic Chemistry, Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran.
| | - Morteza Torabi
- Department of Organic Chemistry, Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran
| | - Meysam Yarie
- Department of Organic Chemistry, Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran.
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Prabhune A, Dey R. Green and sustainable solvents of the future: Deep eutectic solvents. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
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10
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Wan X, He Y, Li C, Yang C. Encapsulating eutectogels for stretchable humidity-resistant strain sensors. SOFT MATTER 2023; 19:2570-2578. [PMID: 36946098 DOI: 10.1039/d3sm00026e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Eutectogels are stretchable ionic conductors extensively developed in recent years, owing to their distinct advantages of low cost, non-volatility, non-toxicity, and outstanding biocompatibility. However, the susceptibility to humidity caused by the exchange of water molecules between the interiors of eutectogels and the external environment greatly restricts their practical applications. Here, a dip-coating strategy is proposed to fabricate a P(MEA-co-IBA) elastomer-coated P(AAC-co-AAM) eutectogel to achieve satisfactory humidity-resistant capability. The hydrophobic elastomer coating significantly suppresses water exchange without harming the stretchability (>500%) and conductivity of the eutectogel. Strong adhesion forms at the eutectogel-coating interface due to the formation of an interpenetrating layer. The superior electromechanical performances of encapsulated eutectogels enable stretchable ionotronic devices with stable electrical performance (>1 h) and remarkable water-droplet/moist resistances during static/dynamic loadings. A humidity-resistant encapsulated eutectogel-based wearable strain sensor is further demonstrated. The proposed humidity-resistant eutectogels are promising candidates for soft and wearable ionotronics for practical applications.
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Affiliation(s)
- Xiaodong Wan
- Shenzhen Key Laboratory of Soft Mechanics & Smart Manufacturing, Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, 518055, P. R. China.
- Guangdong Provincial Key Lab of Robotics and Intelligent System, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, P. R. China
- SIAT Branch, Shenzhen Institute of Artifcial Intelligence and Robotics for Society, Shenzhen 518055, P. R. China
| | - Yunfeng He
- Shenzhen Key Laboratory of Soft Mechanics & Smart Manufacturing, Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, 518055, P. R. China.
| | - Caicong Li
- Shenzhen Key Laboratory of Soft Mechanics & Smart Manufacturing, Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, 518055, P. R. China.
| | - Canhui Yang
- Shenzhen Key Laboratory of Soft Mechanics & Smart Manufacturing, Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, 518055, P. R. China.
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Li J, Zhang M, He J, Ni P. Exploring anionic homopolymerization and copolymerization of vinyl monomers in deep eutectic solvent. Eur Polym J 2023. [DOI: 10.1016/j.eurpolymj.2023.112044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
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12
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Mero A, Koutsoumpos S, Giannios P, Stavrakas I, Moutzouris K, Mezzetta A, Guazzelli L. Comparison of physicochemical and thermal properties of choline chloride and betaine-based deep eutectic solvents: the influence of hydrogen bond acceptor and hydrogen bond donor nature and their molar ratios. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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13
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Hydrophobic Deep Eutectic Solvents Based on Cineole and Organic Acids. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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Dai Y, Chu X, Jiao Y, Li Y, Shan F, Zhao S, Li G, Lei Z, Cui P, Zhu Z, Wang Y. Molecular insights into azeotrope separation in the methyl tert-butyl ether production process using ChCl-based deep eutectic solvents. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2022.118179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Reis GSA, de Souza RM, Ribeiro MCC. Molecular Dynamics Simulation Study of the Far-Infrared Spectrum of a Deep Eutectic Solvent. J Phys Chem B 2022; 126:5695-5705. [PMID: 35858287 DOI: 10.1021/acs.jpcb.2c03277] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Deep eutectic solvents (DESs) are similar to ionic liquids (IL) in terms of physicochemical properties and technical uses. In ILs, far-infrared (FIR) spectroscopy has been utilized to reveal ionic interactions and even to produce a signature of the strengthening of the cation-anion hydrogen bond. However, for the situation of the DES, where the mixing of a salt and a molecular species makes the interplay between multiple intermolecular interactions even more complex, a full investigation of FIR spectra is still absent. In this work, the FIR spectrum of the DES, often referred to as ethaline, which is a 1:2 mixture of choline chloride and ethylene glycol, is calculated using classical molecular dynamics (MD) simulations and compared to experimental data. To explore the induced dipole effect on the computed FIR spectrum, MD simulations were run with both nonpolarizable and polarizable models. The calculation satisfactorily reproduces the position of the peak at ∼110 cm-1 and the bandwidth seen in the experimental FIR spectrum of ethaline. The MD simulations show that the charge current is the most important contributor to the FIR spectrum, but the cross-correlation between the charge current and dipole reorientation also plays a role in the polarizable model. The dynamics of the chloride-ethylene glycol correlation span a wide frequency range, with a maximum at ∼150 cm-1, but it participates as a direct mechanism only in the charge current-dipole reorientation cross-term. Anion correlations, whose dynamics are regulated via correlation with both ethylene glycol and choline, make the most significant contribution to the charge current mechanism. The MD simulations were also utilized to investigate the effect on the FIR spectrum of adding water to the DES and switching to a 1:1 composition.
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Affiliation(s)
- Gabriela S A Reis
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05513-970 São Paulo, São Paulo, Brazil
| | - Rafael M de Souza
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05513-970 São Paulo, São Paulo, Brazil
| | - Mauro C C Ribeiro
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05513-970 São Paulo, São Paulo, Brazil
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