1
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Du MX, Yuan YF, Zhang JM, Liu JJ, Liu CY. Polymer solubility mechanism in ionic liquids: 1H-NMR spectra and two-parameter hydrogen bonding analysis. Phys Chem Chem Phys 2024; 26:16942-16946. [PMID: 38859735 DOI: 10.1039/d4cp01703j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2024]
Abstract
Understanding the polymer solubility in ionic liquids (ILs) is important for polymer processing or polymeric material preparation. Previously, two-parameter H-bonding analysis has been proposed to clarify that polymer solubility in ILs is dominated by H-bonding interactions (Y. F. Yuan et al., Phys. Chem. Chem. Phys., 2021, 23, 21893-21900). In the present work, 1H-NMR spectra are adopted to characterize the H-bonding interactions between polymers and ILs, which provide a microscopic relation between polymer solubility and two-parameter H-bonding analysis.
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Affiliation(s)
- Ming-Xuan Du
- CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China.
| | - Ya-Fei Yuan
- CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China.
| | - Jin-Ming Zhang
- CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China.
| | - Jia-Jian Liu
- CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China.
| | - Chen-Yang Liu
- CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China.
- University of Chinese Academy of Sciences, Beijing, 100049, China
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2
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Gousseva E, Towers Tompkins FK, Seymour JM, Parker LG, Clarke CJ, Palgrave RG, Bennett RA, Grau-Crespo R, Lovelock KRJ. Anion-Dependent Strength Scale of Interactions in Ionic Liquids from X-ray Photoelectron Spectroscopy, Ab Initio Molecular Dynamics, and Density Functional Theory. J Phys Chem B 2024; 128:5030-5043. [PMID: 38727250 PMCID: PMC11129296 DOI: 10.1021/acs.jpcb.4c00362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 04/22/2024] [Accepted: 04/22/2024] [Indexed: 05/24/2024]
Abstract
Using a combination of experiments and calculations, we have gained new insights into the nature of anion-cation interactions in ionic liquids (ILs). An X-ray photoelectron spectroscopy (XPS)-derived anion-dependent electrostatic interaction strength scale, determined using XPS core-level binding energies for IL cations, is presented here for 39 different anions, with at least 18 new anions included. Linear correlations of experimental XPS core-level binding energies for IL cations with (a) calculated core binding energies (ab initio molecular dynamics (AIMD) simulations were used to generate high-quality model IL structures followed by single-point density functional theory (DFT) to obtain calculated core binding energies), (b) experimental XPS core-level binding energies for IL anions, and (c) other anion-dependent interaction strength scales led to three main conclusions. First, the effect of different anions on the cation can be related to ground-state interactions. Second, the variations of anion-dependent interactions with the identity of the anion are best rationalized in terms of electrostatic interactions and not occupied valence state/unoccupied valence state interactions or polarizability-driven interactions. Therefore, the XPS-derived anion-dependent interaction strength scale can be explained using a simple electrostatic model based on electrostatic site potentials. Third, anion-probe interactions, irrespective of the identity of the probe, are primarily electrostatic, meaning that our electrostatic interaction strength scale captures some inherent, intrinsic property of anions independent of the probe used to measure the interaction strength scale.
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Affiliation(s)
| | | | - Jake M. Seymour
- Department
of Chemistry, University of Reading, Reading RG6 6DX, U.K.
| | - Lewis G. Parker
- Department
of Chemistry, University of Reading, Reading RG6 6DX, U.K.
| | - Coby J. Clarke
- School
of Chemistry, University of Nottingham, Nottingham NG7 2RD, U.K.
| | - Robert G. Palgrave
- Department
of Chemistry, University College London, London WC1H 0AJ, U.K.
| | - Roger A. Bennett
- Department
of Chemistry, University of Reading, Reading RG6 6DX, U.K.
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3
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Mukherjee K, Palchowdhury S, Maroncelli M. Do Electrostatics Control the Diffusive Dynamics of Solitary Water? NMR and MD Studies of Water Translation and Rotation in Dipolar and Ionic Solvents. J Phys Chem B 2024; 128:3689-3706. [PMID: 38588535 DOI: 10.1021/acs.jpcb.3c08300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/10/2024]
Abstract
NMR-based measurements of the diffusion coefficients and rotation times of solitary water and benzene at 300 K are reported in a diverse collection of 13 conventional organic solvents and 10 imidazolium ionic liquids. Proton chemical shifts of water are found to be correlated to water OH-stretching frequencies, confirming the importance of electrostatic interactions in these shifts. However, the influence of magnetic interactions in aromatic solvents renders chemical shifts a less reliable indicator of electrostatics. Diffusion coefficients (DB) and rotational correlation times (τB) of benzene in the solvents examined are accurately described as functions of viscosity (η) by DB ∝ η-0.81 and τB ∝ η0.64. Literature values of DB and τB in alkane and normal alcohols, which were not included among the solvents studied here, are systematically faster than predicted by these correlations, indicating that factors beyond solvent viscosity play a role in determining the friction on benzene. In contrast to benzene, water diffusion and rotation are poorly described in terms of viscosity alone, even in the dipolar and ionic solvents measured here. The present data and the substantial literature data already available on dilute water diffusion show a systematic dependence of DW on solvent polarity among isoviscous solvents. The aspect of solvent polarity most relevant to water dynamics is the ability of a solvent to accept hydrogen bonds from water, as conveniently quantified by the frequency of water's OH stretching band, ΔνOH. The friction on translation, ζtr = kBT/DW, and rotation, ζrot = kBTτW, are both well correlated by functions of the form ζ(η, ΔνOH) = a1ηa2 exp (a3ΔνOH), where the ai are adjustable parameters. Molecular dynamics simulations reveal a strong coupling between electrostatic and nonelectrostatic water-solvent interactions, which makes it impossible to dissect the friction on water into additive dielectric and hydrodynamic components. Simulations also provide a tentative explanation for the unusual form of the correlating function ζ(η, ΔνOH), at least in the case of ζrot.
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Affiliation(s)
- Kallol Mukherjee
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Sourav Palchowdhury
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Mark Maroncelli
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
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4
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Aldroubi S, Geneste A, Guiffrey P, El-Sakhawy M, Kamel S, Bou Malham I, Hesemann P, Mehdi A, Brun N. Ionothermal Carbonization of Sugarcane Bagasse in 1-Alkyl-3-methylimidazolium Ionic Liquids: Insights into the Role of the Chloroferrate Anion. J Phys Chem B 2024; 128:3485-3498. [PMID: 38549268 DOI: 10.1021/acs.jpcb.3c08457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
We report the ionothermal carbonization (ITC) of lignocellulosic biomass in imidazolium tetrachloroferrate ionic liquids (ILs) as an advantageous approach for the preparation of nanostructured carbonaceous materials, namely, ionochars. In a previous study, we investigated the role of the imidazolium cation and demonstrated the possibility of controlling both the textural and morphological properties of ionochars by cation engineering. Although essential for providing intermediate Lewis acidity and relatively high thermal stability, the role of the chloroferrate anion is still open to debate. Herein, we investigated the ITC of sugarcane bagasse and its main component, cellulose, in 1-alkyl-3-methylimidazolium ILs with different chloroferrate anions. We identified anionic speciation and its impact on the properties of the IL by Raman spectroscopy, thermogravimetric analysis, and differential scanning calorimetry. The obtained ionochars were characterized by gas physisorption, electron microscopy, Raman spectroscopy, Fourier transform infrared (FTIR) spectroscopy, and 13C solid-state CP-MAS NMR spectroscopy. We show that the anionic species have a predominant impact on the textural and morphological properties of the ionochars.
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Affiliation(s)
- Soha Aldroubi
- ICGM, Univ. Montpellier, CNRS, ENSCM, 34293 Montpellier, France
| | - Amine Geneste
- ICGM, Univ. Montpellier, CNRS, ENSCM, 34293 Montpellier, France
| | | | - Mohamed El-Sakhawy
- Cellulose and Paper Department, National Research Centre, 12622 Giza, Egypt
| | - Samir Kamel
- Cellulose and Paper Department, National Research Centre, 12622 Giza, Egypt
| | | | - Peter Hesemann
- ICGM, Univ. Montpellier, CNRS, ENSCM, 34293 Montpellier, France
| | - Ahmad Mehdi
- ICGM, Univ. Montpellier, CNRS, ENSCM, 34293 Montpellier, France
| | - Nicolas Brun
- ICGM, Univ. Montpellier, CNRS, ENSCM, 34293 Montpellier, France
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5
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Du MX, Han LX, Wang SR, Xu KJ, Zhu WR, Qiao X, Liu CY. Solvent Effects on the 1 H-NMR Chemical Shifts of Imidazolium-Based Ionic Liquids. Chemphyschem 2023; 24:e202300292. [PMID: 37491736 DOI: 10.1002/cphc.202300292] [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: 04/24/2023] [Revised: 07/22/2023] [Accepted: 07/25/2023] [Indexed: 07/27/2023]
Abstract
The 1 H nuclear magnetic resonance (1 H-NMR) spectrum is a useful tool for characterizing the hydrogen bonding (H-bonding) interactions in ionic liquids (ILs). As the main hydrogen bond (H-bond) donor of imidazolium-based ILs, the chemical shift (δH2 ) of the proton in the 2-position of the imidazolium ring (H2) exhibits significant and complex solvents, concentrations and anions dependence. In the present work, based on the dielectric constants (ϵ) and Kamlet-Taft (KT) parameters of solvents, we identified that the δH2 are dominated by the solvents polarity and the competitive H-bonding interactions between cations and anions or solvents. Besides, the solvents effects on δH2 are understood by the structure of ILs in solvents: 1) In diluted solutions of inoizable solvents, ILs exist as free ions and the cations will form H-bond with solvents, resulting in δH2 being independent with anions but positively correlated with βS . 2) In diluted solutions of non-ionzable solvents, ILs exist as contact ion-pairs (CIPs) and H2 will form H-bond with anions. Since non-ionizable solvents hardly influence the H-bonding interactions between H2 and anions, the δH2 are not related to βS but positively correlated with βIL .
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Affiliation(s)
- Ming-Xuan Du
- Department CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, The Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Sciences, Beijing, 10049, China
- Beijing National Laboratory for Molecular Sciences, Beijing, 100190, China
| | - Lin-Xue Han
- Department CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, The Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Sciences, Beijing, 10049, China
- Beijing National Laboratory for Molecular Sciences, Beijing, 100190, China
| | - Shi-Rong Wang
- Department CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, The Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Sciences, Beijing, 10049, China
- Beijing National Laboratory for Molecular Sciences, Beijing, 100190, China
| | - Kuang-Jie Xu
- Department CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, The Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Sciences, Beijing, 10049, China
- Beijing National Laboratory for Molecular Sciences, Beijing, 100190, China
| | - Wen-Rui Zhu
- Department CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, The Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Sciences, Beijing, 10049, China
- Beijing National Laboratory for Molecular Sciences, Beijing, 100190, China
| | - Xin Qiao
- Department CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, The Chinese Academy of Sciences, Beijing, 100190, China
- Beijing National Laboratory for Molecular Sciences, Beijing, 100190, China
| | - Chen-Yang Liu
- Department CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, The Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Sciences, Beijing, 10049, China
- Beijing National Laboratory for Molecular Sciences, Beijing, 100190, China
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6
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Martínez‐Crespo L, Vitórica‐Yrezábal IJ, Whitehead GFS, Webb SJ. Chemically Fueled Communication Along a Scaffolded Nanoscale Array of Squaramides. Angew Chem Int Ed Engl 2023; 62:e202307841. [PMID: 37429824 PMCID: PMC10952809 DOI: 10.1002/anie.202307841] [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: 06/05/2023] [Revised: 07/06/2023] [Accepted: 07/07/2023] [Indexed: 07/12/2023]
Abstract
Relaying conformational change over several nanometers is central to the function of allosterically regulated proteins. Replicating this mechanism artificially would provide important communication tools, but requires nanometer-sized molecules that reversibly switch between defined shapes in response to signaling molecules. In this work, 1.8 nm long rigid rod oligo(phenylene-ethynylene)s are scaffolds for switchable multi-squaramide hydrogen-bond relays. Each relay can adopt either a parallel or an antiparallel orientation relative to the scaffold; the preferred orientation is dictated by a director group at one end. An amine director responded to proton signals, with acid-base cycles producing multiple reversible changes in relay orientation that were reported by a terminal NH, which is 1.8 nm distant. Moreover, a chemical fuel acted as a dissipative signal. As the fuel was consumed, the relay reverted to its original orientation, illustrating how information from out-of-equilibrium molecular signals can be communicated to a distant site.
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Affiliation(s)
- Luis Martínez‐Crespo
- Department of ChemistryUniversity of Manchester Oxford RoadManchesterM13 9PLUK
- Manchester Institute of BiotechnologyUniversity of Manchester131 Princess StreetManchesterM1 7DNUK
| | | | | | - Simon J. Webb
- Department of ChemistryUniversity of Manchester Oxford RoadManchesterM13 9PLUK
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7
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Christoff-Tempesta T, Epps TH. Ionic-Liquid-Mediated Deconstruction of Polymers for Advanced Recycling and Upcycling. ACS Macro Lett 2023; 12:1058-1070. [PMID: 37516988 PMCID: PMC10433533 DOI: 10.1021/acsmacrolett.3c00276] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 06/26/2023] [Indexed: 08/01/2023]
Abstract
Ionic liquids (ILs) are a promising medium to assist in the advanced (chemical and biological) recycling of polymers, owing to their tunable catalytic activity, tailorable chemical functionality, low vapor pressures, and thermal stability. These unique physicochemical properties, combined with ILs' capacity to solubilize plastics waste and biopolymers, offer routes to deconstruct polymers at reduced temperatures (and lower energy inputs) versus conventional bulk and solvent-based methods, while also minimizing unwanted side reactions. In this Viewpoint, we discuss the use of ILs as catalysts and mediators in advanced recycling, with an emphasis on chemical recycling, by examining the interplay between IL chemistry and deconstruction thermodynamics, deconstruction kinetics, IL recovery, and product recovery. We also consider several potential environmental benefits and concerns associated with employing ILs for advanced recycling over bulk- or solvent-mediated deconstruction techniques, such as reduced chemical escape by volatilization, decreased energy demands, toxicity, and environmental persistence. By analyzing IL-mediated polymer deconstruction across a breadth of macromolecular systems, we identify recent innovations, current challenges, and future opportunities in IL application toward circular polymer economies.
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Affiliation(s)
- Ty Christoff-Tempesta
- Department
of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, United States
| | - Thomas H. Epps
- Department
of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, United States
- Department
of Materials Science and Engineering, University
of Delaware, Newark, Delaware 19716, United States
- Center
for Research in Soft matter and Polymers (CRiSP), University of Delaware, Newark, Delaware 19716, United States
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8
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Unger AJ, Jensen MP. Room-Temperature Ionic Liquid Cation Effects on the Structure and Stability of Anionic Lanthanide Complexes. Inorg Chem 2023; 62:5553-5564. [PMID: 36976891 DOI: 10.1021/acs.inorgchem.3c00050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
Abstract
Room-temperature ionic liquids (RTILs) are a subset of molten salts that are liquids at room temperature and may offer an elegant, low-temperature route to predicting the properties of solvated metal complexes in their high-temperature analogues. This work studied the chemistry of chloride anion-containing RTILs to determine their similarity to inorganic molten chloride salts. The behaviors of complexes of Mn, Nd, and Eu were evaluated in a variety of chloride RTILs by absorption spectrophotometry and electrochemistry to elucidate trends in cation effects on the coordination geometry and redox properties of the solvated species. Spectrophotometric data indicated the metals are present as anionic complex (e.g., MnCl42- and NdCl63-) analogous to those observed in molten chloride salts. Strongly polarizing, charge-dense RTIL cations induced distortions to the symmetry of these complexes, resulting in lower oscillator strengths and red-shifted energies for the observed transitions. Cyclic voltammetry experiments were used to characterize the Eu(III/II) redox couple producing diffusion coefficients on the order of 10-8 cm2 s-1 and heterogeneous electron transfer rate constants ranging between 6 × 10-5 and 2 × 10-4 cm s-1. The E1/2 potentials for Eu(III/II) were also found to shift positively with increasing cation polarization power, stabilizing the Eu(II) oxidation state by removing electron density from the metal center over chloride bond networks. Both the optical spectrophotometry and electrochemistry results suggest that the polarization strength of an RTIL cation plays a major role in the geometry and stability of a metal complex.
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9
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Nikovskiy I, Aleshin DY, Novikov VV, Polezhaev AV, Khakina EA, Melnikova EK, Nelyubina YV. Selective Pathway toward Heteroleptic Spin-Crossover Iron(II) Complexes with Pyridine-Based N-Donor Ligands. Inorg Chem 2022; 61:20866-20877. [PMID: 36511893 DOI: 10.1021/acs.inorgchem.2c03270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A new synthetic pathway is devised to selectively produce previously elusive heteroleptic iron(II) complexes of terpyridine and N,N'-disubstituted bis(pyrazol-3-yl)pyridines that stabilize the opposite spin states of the metal ion. Such a combination of the ligands in a series of the heteroleptic complexes induces the spin-crossover (SCO) not experienced by the homoleptic complexes of these ligands or shifts it to lower/higher temperatures respective to the SCO-active homoleptic complex. The midpoint temperatures of the resulting SCO span from ca. 200 K to the ambient temperature and beyond the highest temperature accessible by NMR spectroscopy and SQUID magnetometry. The proposed "one-pot" approach is applicable to other N-donor ligands to selectively produce heteroleptic complexes─including those inaccessible by alternative synthetic pathways─with highly tunable SCO behaviors for practical applications in sensing, switching, and multifunctional devices.
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Affiliation(s)
- Igor Nikovskiy
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991Moscow, Russia.,Bauman Moscow State Technical University, 2nd Baumanskaya Str., 5, 105005Moscow, Russia
| | - Dmitry Yu Aleshin
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991Moscow, Russia
| | - Valentin V Novikov
- Bauman Moscow State Technical University, 2nd Baumanskaya Str., 5, 105005Moscow, Russia.,Moscow Institute of Physics and Technology, Institutskiy per., 9, 141700Dolgoprudny, Russia
| | - Alexander V Polezhaev
- Bauman Moscow State Technical University, 2nd Baumanskaya Str., 5, 105005Moscow, Russia
| | - Ekaterina A Khakina
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991Moscow, Russia.,HSE University, Miasnitskaya Str., 20, 101000Moscow, Russia
| | - Elizaveta K Melnikova
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991Moscow, Russia
| | - Yulia V Nelyubina
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991Moscow, Russia.,Bauman Moscow State Technical University, 2nd Baumanskaya Str., 5, 105005Moscow, Russia
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10
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Majhi D, Dai J, Dvinskikh SV. Insights into cation-anion hydrogen bonding in mesogenic ionic liquids: an NMR study. Phys Chem Chem Phys 2022; 24:23532-23539. [PMID: 36129074 DOI: 10.1039/d2cp03188d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The hydrogen-bonding interaction is studied in imidazolium-based mesogenic ionic liquids in their isotropic, smectic, and solid phases and in a nanoconfined state by proton solid-state nuclear magnetic resonance (NMR). In the smectic phase, the more basic anions form stronger hydrogen bonds. A small decrease of H-bonding in the mesophase with respect to that in the isotropic phase is associated with the presence of a layered assembly with high orientational order and limited conformational freedom. Hydrogen bond strength is not sensitive to the cation structural modification as long as the aprotic nature of the material is preserved. The strong cation-anion hydrogen bonding observed in the smectic phases provides direct support for the presence of ionic sublayers which form in ionic liquid crystals regardless of the location and alignment of the charged group in the cation, particularly irrespective of whether the charged group occupies a terminal or central position in the cation structure. A comparison of the results obtained in isotropic, liquid-crystalline, and solid states shows that in the bulk materials the dynamic state of ions ranging from high reorientational and translational freedom to partial orientation and positional order to full immobilization, respectively, has no strong impact on the cation-anion hydrogen bond strength. On the other hand, nanoconfinement of ionic liquid crystals led to hydrogen bond disruption due to competing interactions of anions with a solid interface.
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Affiliation(s)
- Debashis Majhi
- KTH Royal Institute of Technology, Stockholm, Sweden. .,Stockholm University, Stockholm, Sweden
| | - Jing Dai
- KTH Royal Institute of Technology, Stockholm, Sweden.
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11
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Vilas-Boas S, Martins MA, Tentor FR, Teixeira G, Sgorlon JG, Coutinho JA, Ferreira O, Pinho SP. Imidazolium Chloride Ionic Liquid Mixtures as Separating Agents: Fuel Processing and Azeotrope Breaking. ENERGY & FUELS : AN AMERICAN CHEMICAL SOCIETY JOURNAL 2022; 36:8552-8561. [PMID: 36570635 PMCID: PMC9778084 DOI: 10.1021/acs.energyfuels.2c01724] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 07/12/2022] [Indexed: 06/17/2023]
Abstract
Relevant chemical separations for the petrochemical and chemical industries include the removal of aromatic hydrocarbons from aliphatics, the desulfurization and denitrification of fuels, and the separation of azeotropic mixtures containing alkanols. In an attempt to contribute to the development of novel technologies, the potentialities of imidazolium chloride ionic liquid (IL) mixtures as separation agents were investigated. Selectivities, capacities, and solvent performance indices were calculated through the activity coefficients at infinite dilution of organic solutes and water in the imidazolium chloride IL: [C8mim]Cl, [C12mim]Cl, and the equimolar mixture of [C4mim]Cl and [C12mim]Cl. Results show that the imidazolium chloride IL might be appropriately tailored for specific purposes, in which an increase in the proportion of cations containing larger alkyl chains tends to increase the overall affinity with organic solutes. The IL designer solvent concept was explored by comparing the IL equimolar mixture results with the intermediary [C8mim]Cl. The COSMO-RS thermodynamic model was also applied, showing it to be a promising tool for a fast qualitative screening of potential separation agents for specific separation processes.
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Affiliation(s)
- Sérgio
M. Vilas-Boas
- Centro
de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253 Bragança, Portugal
- CICECO-Aveiro
Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Mónia A.
R. Martins
- CICECO-Aveiro
Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Fábio R. Tentor
- Centro
de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253 Bragança, Portugal
- Federal
University of Technology of Paraná-UTFPR, Rua Marcílio Dias, 635, Apucarana, 86812-460 Parana, Brazil
| | - Gabriel Teixeira
- Centro
de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253 Bragança, Portugal
- CICECO-Aveiro
Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Juliana G. Sgorlon
- Federal
University of Technology of Paraná-UTFPR, Rua Marcílio Dias, 635, Apucarana, 86812-460 Parana, Brazil
| | - João A.
P. Coutinho
- CICECO-Aveiro
Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Olga Ferreira
- Centro
de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253 Bragança, Portugal
| | - Simão P. Pinho
- Centro
de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253 Bragança, Portugal
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12
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Scovazzo P, Sullivan-González F, Amos R. Hydrogen-bond acceptance's role in designing room temperature ionic liquid (RTIL) membranes for gas separations: Part II, β-parameter and relative humidity impacts on membrane stability. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.120595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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13
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Choi W, Abraham A, Ko J, Son JG, Cho J, Sang BI, Yeom B. Anisotropic Alignment of Bacterial Nanocellulose Ionogels for Unconventionally High Combination of Stiffness and Damping. ACS APPLIED MATERIALS & INTERFACES 2022; 14:30056-30066. [PMID: 35737510 DOI: 10.1021/acsami.2c05500] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Ionogels are emerging materials for advanced electrochemical devices; however, their mechanical instability to external stresses has raised concerns about their safety. This study reports aligned bacterial nanocellulose (BC) ionogel films swelled with the model ionic liquid (IL) of 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF4) for an unprecedented combination of high stiffness and high energy dissipation without significant loss of ionic conductivity. The aligned BC ionogel films are prepared through wet-state stretching methods, followed by drying and swelling by ILs. The aligned ionogel films exhibit significantly improved dynamic mechanical properties, overcoming the mechanical conventional limit of traditional materials by 2.0 times at 25 °C and by a maximum of 4.0 times at 0 °C. Additionally, the same samples exhibit relatively high ionic conductivities of 0.16 mS cm-1 at 20 °C and 0.45 mS cm-1 at 60 °C with storage moduli over 10 GPa. The synergistic effect of the mechanical reinforcements by alignment of the BC nanofibers and the plasticizing effects by ILs could be attributed to the significant enhancement of dynamic mechanical properties and the retention of ionic conductivities. These results will lead to a deeper understanding of the material design for mechanically superior ionogel systems with increasing demands for advanced electronic and electrochemical devices.
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Affiliation(s)
- Wonseok Choi
- Department of Chemical Engineering, Hanyang University Seoul 04763, Republic of Korea
| | - Amith Abraham
- Department of Chemical Engineering, Hanyang University Seoul 04763, Republic of Korea
| | - Jongkuk Ko
- Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Republic of Korea
| | - Jeong Gon Son
- Soft Hybrid Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Republic of Korea
| | - Jinhan Cho
- Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Republic of Korea
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Republic of Korea
| | - Byoung-In Sang
- Department of Chemical Engineering, Hanyang University Seoul 04763, Republic of Korea
| | - Bongjun Yeom
- Department of Chemical Engineering, Hanyang University Seoul 04763, Republic of Korea
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14
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Structural effect of imidazolium salts on electrochemical conversion of carbon dioxide to imidazolium carboxylate. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.118964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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15
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Diejomaoh Abafe OT, Azim MM, Martincigh BS, Stark A. Cation-fluorinated ionic liquids: Synthesis, physicochemical properties and comparison with non-fluorinated analogues. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118104] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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16
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Weiß N, Thielemann G, Nagel K, Schmidt CH, Seifert A, Kaßner L, Strehmel V, Corzilius B, Schröder C, Spange S. The influence of the cation structure on the basicity-related polarity of ionic liquids. Phys Chem Chem Phys 2021; 23:26750-26760. [PMID: 34846390 DOI: 10.1039/d1cp03986e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
UV/Vis absorption data of (E)-4-(2-[5-{4,4,5,5-tetramethyl-1,3,2-dioxaborolane-2-yl}thiene-2-yl]vinyl)-2-(dicyano-methylene)-3-cyano-5,5-dimethyl-2,5-dihydrofuran (ThTCF) as a solvatochromic probe is applied to examine the anion coordination strength (e.g. of N(CN)2, BF4, PF6, N(Tf)2, CF3COO) as a function of the cation structure of ionic liquids. Several 1-n-alky-3-methylimidazolium- and tetraalkylammonium CH3-NR3+-based ILs with different n-alkyl chain lengths (R = -C4H9, -C6H11, -C8H17, -C10H21) are considered. UV/Vis absorption data of ThTCF show subtle correlations with hydrogen bond accepting (HBA) ability-related measurands such as Kamlet-Taft β, Freire's EHB, and Laurence β1 parameter as a function of anion and cation structure. The different influence of the n-alkyl chain length of imidazolium- and tetraalkylammonium-based ILs on the dipolarity and HBA strength is confirmed by comparison with the 14N isotropic hyperfine coupling constants (Aiso) of a positively (CATI) and negatively charged spin probe (TSKCr) of TEMPO-type [(2,2,6,6-tetramethylpiperidin-1-yl)oxyl] and quantum chemically derived dipoles of the cations. The Aiso values correlate with the absorption energy of ThTCF and EHB, but in different ways depending on the anion or charge of the spin probe. In a final discussion of the β, EHB, and β1 scales in relation to ThTCF, the importance of the molar concentration N of ionic liquids for the physical significance of the respective parameters is discussed.
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Affiliation(s)
- Nadine Weiß
- Department of Polymer Chemistry, Institute of Chemistry, Chemnitz University of Technology, Straße der Nationen 62, 09111 Chemnitz, Germany.
| | - Gabi Thielemann
- Department of Polymer Chemistry, Institute of Chemistry, Chemnitz University of Technology, Straße der Nationen 62, 09111 Chemnitz, Germany.
| | - Kevin Nagel
- Department of Polymer Chemistry, Institute of Chemistry, Chemnitz University of Technology, Straße der Nationen 62, 09111 Chemnitz, Germany.
| | - Caroline H Schmidt
- Department of Polymer Chemistry, Institute of Chemistry, Chemnitz University of Technology, Straße der Nationen 62, 09111 Chemnitz, Germany.
| | - Andreas Seifert
- Department of Polymer Chemistry, Institute of Chemistry, Chemnitz University of Technology, Straße der Nationen 62, 09111 Chemnitz, Germany.
| | - Lysann Kaßner
- Department of Polymer Chemistry, Institute of Chemistry, Chemnitz University of Technology, Straße der Nationen 62, 09111 Chemnitz, Germany.
| | - Veronika Strehmel
- Department of Chemistry, Organic Chemistry and Institute for Coatings and Surface Chemistry, Hochschule Niederrhein, University of Applied Sciences, Adlerstraße 32, 47798 Krefeld, Germany.
| | - Björn Corzilius
- Institute of Chemistry, University Rostock, Albert-Einstein-Str. 3a, 18059 Rostock, Germany.
| | - Christian Schröder
- Institute of Computational Biological Chemistry, University of Vienna, Währingerstr. 17, 1090 Vienna, Austria.
| | - Stefan Spange
- Department of Polymer Chemistry, Institute of Chemistry, Chemnitz University of Technology, Straße der Nationen 62, 09111 Chemnitz, Germany.
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17
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Beil S, Markiewicz M, Pereira CS, Stepnowski P, Thöming J, Stolte S. Toward the Proactive Design of Sustainable Chemicals: Ionic Liquids as a Prime Example. Chem Rev 2021; 121:13132-13173. [PMID: 34523909 DOI: 10.1021/acs.chemrev.0c01265] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The tailorable and often unique properties of ionic liquids (ILs) drive their implementation into a broad variety of seminal technologies. The modular design of ILs allows in this context a proactive selection of structures that favor environmental sustainability─ideally without compromising their technological performance. To achieve this objective, the whole life cycle must be taken into account and various aspects considered simultaneously. In this review, we discuss how the structural design of ILs affects their environmental impacts throughout all stages of their life cycles and scrutinize the available data in order to point out knowledge gaps that need further research activities. The design of more sustainable ILs starts with the selection of the most beneficial precursors and synthesis routes, takes their technical properties and application specific performance into due account, and considers its environmental fate particularly in terms of their (eco)toxicity, biotic and abiotic degradability, mobility, and bioaccumulation potential. Special emphasis is placed on reported structure-activity relationships and suggested mechanisms on a molecular level that might rationalize the empirically found design criteria.
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Affiliation(s)
- Stephan Beil
- Institute of Water Chemistry, TU Dresden, 01062 Dresden, Germany
| | - Marta Markiewicz
- Institute of Water Chemistry, TU Dresden, 01062 Dresden, Germany
| | - Cristina Silva Pereira
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa (ITQB NOVA), Av. da República, 2780-157 Oeiras, Portugal
| | - Piotr Stepnowski
- Department of Environmental Analysis, Faculty of Chemistry, University of Gdańsk, ul. Wita Stwosza 63, 80-308 Gdańsk, Poland
| | - Jorg Thöming
- Chemical Process Engineering, University of Bremen, Leobener Straße 6, 28359 Bremen, Germany
| | - Stefan Stolte
- Institute of Water Chemistry, TU Dresden, 01062 Dresden, Germany
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18
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Yuan YF, Zhang JM, Zhang BQ, Liu JJ, Zhou Y, Du MX, Han LX, Xu KJ, Qiao X, Liu CY. Polymer solubility in ionic liquids: dominated by hydrogen bonding. Phys Chem Chem Phys 2021; 23:21893-21900. [PMID: 34558588 DOI: 10.1039/d1cp03193g] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Polymer solubility in ionic liquids (ILs) cannot be predicted by the solubility parameter approach based on the "like dissolves like" principle. According to the Kamlet-Abraham-Taft (KAT) multi-parameter polarity scale, ILs can be categorized on the basis of hydrogen-bond acidity or basicity ones. The experimental observations, that acidic ILs easily dissolve basic polymers and basic ILs dissolve acidic polymers, reflect the complementary nature of hydrogen-bonding interactions. A quantitative hydrogen-bonding analysis is proposed for predicting the solubility by taking the product of ΔαΔβ as an indicator of the competition between cross-association and self-association hydrogen bonding (H-bonding), where Δα is the difference of acidity parameters between the polymer and IL, and Δβ is the difference of basicity. This solubility criterion has been validated by the solubility data of 19 polymers (11 acidic and 8 basic) in 11 ILs (7 acidic and 4 basic). These principles based on KAT parameters can be applied to other systems dominated by hydrogen bonding.
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Affiliation(s)
- Ya-Fei Yuan
- CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China. .,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Jin-Ming Zhang
- CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China.
| | - Bao-Qing Zhang
- CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China.
| | - Jia-Jian Liu
- CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China.
| | - Yan Zhou
- CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China. .,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Ming-Xuan Du
- CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China. .,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Lin-Xue Han
- CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China. .,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Kuang-Jie Xu
- CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China. .,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xin Qiao
- CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China.
| | - Chen-Yang Liu
- CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China. .,University of Chinese Academy of Sciences, Beijing, 100049, China
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19
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Palumbo O, Cimini A, Trequattrini F, Brubach JB, Roy P, Paolone A. Evidence of the CH···O HydrogenBonding in Imidazolium-Based Ionic Liquids from Far-Infrared Spectroscopy Measurements and DFT Calculations. Int J Mol Sci 2021; 22:ijms22116155. [PMID: 34200392 PMCID: PMC8201385 DOI: 10.3390/ijms22116155] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 06/04/2021] [Accepted: 06/04/2021] [Indexed: 12/14/2022] Open
Abstract
Knowledge of all the intermolecular forces occurring in ionic liquids (ILs) is essential to master their properties. Aiming at investigating the weaker hydrogen bonding in aprotic liquids, the present work combined computational study and far-infrared spectroscopy on four imidazolium-based ILs with different anions. The DFT calculations of the ionic couples, using the ωB97X-D functional and considering both the empirical dispersion corrections and the presence of a polar solvent, show that, for all samples, the lowest energy configurations of the ion pair present H atoms, directly bound to C atoms of the cation and close to O atoms of the anion, capable of creating moderate to weak hydrogen bonding with anions. For the liquids containing anions of higher bonding ability, the absorption curves generated from the calculated vibrational frequencies and intensities show absorption bands between 100 and 125 cm−1 corresponding to the stretching of the hydrogen bond. These indications are in complete agreement with the presently reported temperature dependence of the far-infrared spectrum, where the stretching modes of the hydrogen bonding are detected only for samples presenting a moderate interaction and become particularly prominent at low temperatures. Moreover, from the analysis of the infrared spectra, the occurrence of various phase transitions as a function of temperature was detected, and the difference in the average energy between the H-bonded and the dispersion-governed molecular configurations was evaluated.
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Affiliation(s)
- Oriele Palumbo
- CNR-ISC, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Rome, Italy; (O.P.); (A.C.); (A.P.)
| | - Adriano Cimini
- CNR-ISC, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Rome, Italy; (O.P.); (A.C.); (A.P.)
| | - Francesco Trequattrini
- CNR-ISC, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Rome, Italy; (O.P.); (A.C.); (A.P.)
- Physics Department, Sapienza University of Rome, Piazzale A. Moro 5, 00185 Rome, Italy
- Correspondence:
| | - Jean-Blaise Brubach
- Synchrotron SOLEIL, AILES Beamline, L’Orme des Merisiers Saint-Aubin, BP 48, CEDEX, 91192 Gif-sur-Yvette, France; (J.-B.B.); (P.R.)
| | - Pascale Roy
- Synchrotron SOLEIL, AILES Beamline, L’Orme des Merisiers Saint-Aubin, BP 48, CEDEX, 91192 Gif-sur-Yvette, France; (J.-B.B.); (P.R.)
| | - Annalisa Paolone
- CNR-ISC, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Rome, Italy; (O.P.); (A.C.); (A.P.)
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20
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Liu X, O'Harra KE, Bara JE, Turner CH. Screening Ionic Liquids Based on Ionic Volume and Electrostatic Potential Analyses. J Phys Chem B 2021; 125:3653-3664. [PMID: 33821644 DOI: 10.1021/acs.jpcb.0c10259] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Ionic liquids (ILs) are known to have tunable solvation properties, based on the pairing of different anions and cations, but the compositional landscape is vast and challenging to navigate efficiently. Some computational screening protocols are available, but they can be either time-consuming or difficult to implement. Herein, we perform a detailed investigation of the fundamental role of electrostatic interactions in these systems. We effectively develop a bridge between the previous volume-based approach with a quantum structure-property relationship approach to create fast, simple screening guidelines. We propose a new parameter that is applicable to both monovalent and multivalent ions, the ionic polarity index (IPI), which is defined as the ratio of the average electrostatic surface potential (V̅) of the ion to the net charge of the ion (q). The IPI correlation has been tested on a diverse data set of 121 ions, and reliable predictions can be obtained within a homologous series of IL compounds.
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Affiliation(s)
- Xiaoyang Liu
- Department of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Kathryn E O'Harra
- Department of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Jason E Bara
- Department of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - C Heath Turner
- Department of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States
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21
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Influence of counteranion and humidity on the thermal, mechanical and conductive properties of covalently crosslinked ionenes. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.123641] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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22
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Transition-metal- and phosphorus-free electrophilic trifluoromethylthiolation of indoles with sodium trifluoromethanesulfinates in ionic liquids. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153015] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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23
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Weiß N, Schmidt CH, Thielemann G, Heid E, Schröder C, Spange S. The physical significance of the Kamlet–Taft π* parameter of ionic liquids. Phys Chem Chem Phys 2021; 23:1616-1626. [DOI: 10.1039/d0cp04989a] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Kamlet–Taft dipolarity/polarizability parameters π* for various ionic liquids were determined using 4-tert-butyl-2-((dicyanomethylene)-5-[4-N,N-diethylamino)-benzylidene]-Δ3-thiazoline and 5-(N,N-dimethylamino)-5′-nitro-2,2′-bithiophene as solvatochromic probes.
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Affiliation(s)
- Nadine Weiß
- Chemnitz University of Technology
- 09111 Chemnitz
- Germany
| | | | | | - Esther Heid
- University of Vienna
- Faculty of Chemistry
- Institute for Computational Biological Chemistry
- A-1090 Vienna
- Austria
| | - Christian Schröder
- University of Vienna
- Faculty of Chemistry
- Institute for Computational Biological Chemistry
- A-1090 Vienna
- Austria
| | - Stefan Spange
- Chemnitz University of Technology
- 09111 Chemnitz
- Germany
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24
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25
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Kapoor U, Shah JK. Macroscopic Differentiators for Microscopic Structural Nonideality in Binary Ionic Liquid Mixtures. J Phys Chem B 2020; 124:7849-7856. [PMID: 32790368 DOI: 10.1021/acs.jpcb.0c03740] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Combining two ionic liquids to form a binary ionic liquid mixture is a simple yet effective strategy to not only expand the number of ionic liquids but also precisely control various physicochemical properties of resultant ionic liquid mixtures. From a fundamental thermodynamic point of view, it is not entirely clear whether such mixtures can be classified as ideal solutions. Given a large number of binary ionic liquid mixtures that emerge, the ability to predict the presence of nonideality in such mixtures a priori without the need for experimentation or molecular simulation-based calculations is immensely valuable for their rational design. In this research report, we demonstrate that the difference in the molar volumes (ΔV) of the pure ionic liquids and the difference in the hydrogen-bonding ability of anions (Δβ) are the primary determinants of nonideal behavior of binary ionic liquid mixtures containing a common cation and two anions. Our conclusion is derived from a comparison of microscopic structural properties expressed in terms of radial, spatial, and angular distributions for binary mixtures and those of the corresponding pure ionic liquids. Molecular dynamics simulations of 16 binary ionic liquid mixtures, containing a common cation 1-n-butyl-3-methylimidazolium [C4mim]+ and combinations of (less basic) fluorinated {trifluoromethylacetate [TFA]-, trifluoromethanesulfonate [TFS]-, bis(trifluoromethanesulfonyl)imide [NTf2]-, and tris (pentafluoroethyl) trifluorophosphate [eFAP]-} versus (more basic) nonfluorinated {chloride Cl-, acetate [OAC]-, methylsulfate [MeSO4]-, and dimethylphosphate [Me2PO4]-} anions, were conducted. The large number of binary ionic liquid mixtures examined here enabled us to span a broad range of ΔV and Δβ values. The results indicate that binary mixtures of two ionic liquids for which ΔV > 60 cm3/mol and Δβ > 0.4 are expected to be microscopically nonideal. On the other hand, ΔV < 60 cm3/mol and Δβ < 0.4 will lead to molecular structures that are not differentiated from those of their pure ionic liquid counterparts.
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Affiliation(s)
- Utkarsh Kapoor
- School of Chemical Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| | - Jindal K Shah
- School of Chemical Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, United States
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26
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A computational study of hydrogen bonding motifs in halide, tetrafluoroborate, hexafluorophosphate, and tetraarylborate salts of chiral cationic ruthenium and cobalt guanidinobenzimidazole hydrogen bond donor catalysts; acceptor properties of the “BArf” anion. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114618] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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27
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Spange S, Lienert C, Friebe N, Schreiter K. Complementary interpretation of E T(30) polarity parameters of ionic liquids. Phys Chem Chem Phys 2020; 22:9954-9966. [PMID: 32352138 DOI: 10.1039/d0cp01480j] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reichardt's empirical ET(30) polarity parameter has been established as appropriate polarity scale for ionic liquids. In this study, the relationships of ET(30) of ionic liquids with the empirical Kamlet-Taft polarity parameters α (hydrogen bond donating ability), β (hydrogen bond accepting ability) and π* (dipolarity/polarizability) as well as Catalán's parameter set SA (solvent acidity), SB (solvent basicity), SP (solvent polarizability) and SdP (solvent dipolarity) are examined by means of multiple square correlation analyses. Several subtasks were carried out to address this main concern. First, the influence of anion structure on ET(30) polarity parameters for various ionic liquids are investigated by use of nine differently substituted pyridinio phenolate betaine dyes of the Reichardt type. It is assumed that halide anions can have an effect on the ET(30) parameter. In the second part, the Kamlet-Taft π* parameters have been independently determined for several protic ionic liquids using 4-tert-butyl-2-(dicyanomethylene)-5-[4-(diethylamino)-benzylidene]-Δ3-thiazoline (Th) and N,N-diethyl-4-nitroaniline (DENA) to show the impact of the hydrogen bond donating ability of the IL on the actual π* values as function of probe. α and SA values have been measured using the dicyano-bis(1,10-phenanthroline) iron(ii) complex (Fe) as HBD probe. Finally, the newly determined Reichardt ET(30), Kamlet-Taft and Catalán parameters of ionic liquids were used in addition to literature data to prove correlations of ET(30) with α and π* as well as of ET(30) with SA and SdP. Linear correlations of SdP with the molar concentration of the ionic liquid are highlighted.
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Affiliation(s)
- Stefan Spange
- Chemnitz University of Technology, Straße der Nationen 62, 09111 Chemnitz, Germany.
| | - Caroline Lienert
- Chemnitz University of Technology, Straße der Nationen 62, 09111 Chemnitz, Germany.
| | - Nadine Friebe
- Chemnitz University of Technology, Straße der Nationen 62, 09111 Chemnitz, Germany.
| | - Katja Schreiter
- Chemnitz University of Technology, Straße der Nationen 62, 09111 Chemnitz, Germany.
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28
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Sinha AK, Singh R, Kumar R. Towards an Understanding of the “
Ambiphilic
” Character of Ionic Liquids for Green Synthesis of Chemically Diverse Architectures. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000065] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Arun K. Sinha
- Medicinal and ProcessChemistry DivisionCSIR-Central Drug Research Institute Sector 10, Jankipuram Extension Sitapur Road Lucknow 226031 India
- Academy of Scientific and Innovative Research New Delhi 110001 India
| | - Richa Singh
- Medicinal and ProcessChemistry DivisionCSIR-Central Drug Research Institute Sector 10, Jankipuram Extension Sitapur Road Lucknow 226031 India
- Current Address: Department of ChemistryGaya College Gaya 823001 India
| | - Rajesh Kumar
- Institute of Himalayan Bioresource Technology (CSIR) Palampur 176061 India
- Current Address: State Key Laboratory of Structural Chemistry Fuzhou China- 350002
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29
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Lyu Y, Brennecke JF, Stadtherr MA. Review of Recent Aromatic–Aliphatic–Ionic Liquid Ternary Liquid–Liquid Equilibria and Their Modeling by COSMO-RS. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c00581] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yuanyuan Lyu
- McKetta Department of Chemical Engineering ,University of Texas, Austin, Texas 78712, United States
| | - Joan F. Brennecke
- McKetta Department of Chemical Engineering ,University of Texas, Austin, Texas 78712, United States
| | - Mark A. Stadtherr
- McKetta Department of Chemical Engineering ,University of Texas, Austin, Texas 78712, United States
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30
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Mukherjee T, Ghosh SK, Wititsuwannakul T, Bhuvanesh N, Gladysz JA. Chiral-at-Metal Ruthenium Complexes with Guanidinobenzimidazole and Pentaphenylcyclopentadienyl Ligands: Synthesis, Resolution, and Preliminary Screening as Enantioselective Second Coordination Sphere Hydrogen Bond Donor Catalysts. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00073] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Tathagata Mukherjee
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77843-3012, United States
| | - Subrata K. Ghosh
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77843-3012, United States
| | - Taveechai Wititsuwannakul
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77843-3012, United States
| | - Nattamai Bhuvanesh
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77843-3012, United States
| | - John A. Gladysz
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77843-3012, United States
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31
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Maximuck WJ, Ganzmann C, Alvi S, Hooda KR, Gladysz JA. Rendering classical hydrophilic enantiopure Werner salts [M(en) 3] n+nX - lipophilic (M/n = Cr/3, Co/3, Rh/3, Ir/3, Pt/4); new chiral hydrogen bond donor catalysts and enantioselectivities as a function of metal and charge. Dalton Trans 2020; 49:3680-3691. [PMID: 32124905 DOI: 10.1039/d0dt00523a] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Known hydrophilic halide salts of the title compounds are converted to new lipophilic BArf- (B(3,5-C6H3(CF3)2)4-) salts. These are isolated as hydrates (Λ- or Δ-[M(en)3]n+nBArf-·zH2O; z = 17-9) and characterized by NMR (acetone-d6) and microanalyses. Thermal stabilities are probed by capillary thermolyses and TGA and DSC measurements (onset of dehydration 71-151 °C). In the presence of tertiary amines, they are effective catalysts for enantioselective Michael type carbon-carbon or carbon-nitrogen bond forming additions of 1,3-dicarbonyl compounds (acceptors: trans-β-nitrostyrene, di-tert-butylazodicarboxylate, 2-cyclopenten-1-one; average ee = 33%, 52%, 17%). Effects of the metal and charge upon enantioselectivities are analyzed. A number of properties appear to correlate to the NH Brønsted acidity order ([Pt(en)3]4+ > [Cr(en)3]3+ > [Co(en)3]3+ > [Rh(en)3]3+ > [Ir(en)3]3+).
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Affiliation(s)
- William J Maximuck
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, USA.
| | - Carola Ganzmann
- Institut für Organische Chemie and Interdisciplinary Center for Molecular Materials Friedrich-Alexander-Universität Erlangen-Nürnberg, Henkestraße 42, 91054 Erlangen, Germany
| | - Scheherzad Alvi
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, USA.
| | - Karan R Hooda
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, USA.
| | - John A Gladysz
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, USA.
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32
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Insight into the interaction between arabinoxylan and imidazolium acetate-based ionic liquids. Carbohydr Polym 2020; 231:115699. [PMID: 31888847 DOI: 10.1016/j.carbpol.2019.115699] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2019] [Revised: 10/26/2019] [Accepted: 11/30/2019] [Indexed: 11/23/2022]
Abstract
Herein, six ionic liquids (ILs) with different cations and the same anion of acetate (Ac-) were used to dissolve arabinoxylan. These ILs included N-methylimidazolium acetate (HmimAc), 1-ethyl-3-methylimidazolium acetate (EmimAc), 1-hydroxyethyl-3-methylimidazolium acetate (HOemimAc), 1-propyl-3-methylimidazolium acetate (PrmimAc), 1-allyl-3-methylimidazolium acetate (AmimAc), and 1-butyl-3-methylimidazolium acetate (BmimAc). The solubilities of arabinoxylan in these ILs were determined, and the dissolution mechanism was explained using 1H and 13C NMR techniques. The solubilities of arabinoxylan in the ILs were in the order: BmimAc > EmimAc > AmimAc > PrmimAc > HOemimAc > HmimAc. Both the cation and Ac- played an important role in the solubilization of arabinoxylan, but Ac- performed the major factor. The structure of cation greatly affected the hydrogen bond accepting ability of Ac-. Increasing the mass ratio of arabinoxylan to ILs resulted in stronger hydrogen bond between arabinoxylan and the ILs. Both the solubility and the strength of hydrogen-bonding interaction between arabinoxylan and the ILs decreased in the recycled ILs because of the impurities remained.
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33
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Kabes CQ, Maximuck WJ, Ghosh SK, Kumar A, Bhuvanesh N, Gladysz JA. Chiral Tricationic Tris(1,2-diphenylethylenediamine) Cobalt(III) Hydrogen Bond Donor Catalysts with Defined Carbon/Metal Configurations; Matched/Mismatched Effects upon Enantioselectivities with Enantiomeric Chiral Counter Anions. ACS Catal 2020. [DOI: 10.1021/acscatal.9b05496] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Connor Q. Kabes
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, United States
| | - William J. Maximuck
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, United States
| | - Subrata K. Ghosh
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, United States
| | - Anil Kumar
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, United States
| | - Nattamai Bhuvanesh
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, United States
| | - John A. Gladysz
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, United States
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34
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Miller SA, Nandi J, Leadbeater NE, Eddy NA. Probing the Effect of Counterions on the Oxidation of Alcohols Using Oxoammonium Salts. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901369] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Shelli A. Miller
- Department of Chemistry; University of Connecticut; 55 North Eagleville Road 06269 Storrs Connecticut USA
| | - Jyoti Nandi
- Department of Chemistry; University of Connecticut; 55 North Eagleville Road 06269 Storrs Connecticut USA
| | - Nicholas E. Leadbeater
- Department of Chemistry; University of Connecticut; 55 North Eagleville Road 06269 Storrs Connecticut USA
| | - Nicholas A. Eddy
- Department of Chemistry; University of Connecticut; 55 North Eagleville Road 06269 Storrs Connecticut USA
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35
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Dissolution of lignocellulosic biomass in ionic liquid-water media: Interpretation from solubility parameter concept. KOREAN J CHEM ENG 2019. [DOI: 10.1007/s11814-019-0363-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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36
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Ma J, Kass SR. Electrostatically Enhanced Phosphoric Acids and Their Applications in Asymmetric Friedel-Crafts Alkylations. J Org Chem 2019; 84:11125-11134. [PMID: 31386810 DOI: 10.1021/acs.joc.9b01741] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A series of electrostatically enhanced phosphoric acid catalysts were synthesized and studied. These compounds possess two positively charged N-octylpyridinium or triarylphosphonium ion centers at the 3,3'-positions of the (R)-BINOL backbone to enhance reactivity and provide needed steric bulk for enantioselective transformations. Catalytic activities for Friedel-Crafts alkylations of indoles with trans-β-nitrostyrenes were studied. Both types of catalysts accelerate reaction conversions relative to noncharged analogues, and good enantioselectivities up to 90% ee are observed with the phosphonium-ion-tagged phosphoric acids. This transformation also can be scaled up to synthetically useful amounts, affording >250 mg of product without losing any reactivity or selectivity.
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Affiliation(s)
- Jie Ma
- Department of Chemistry , University of Minnesota , 207 Pleasant Street, SE , Minneapolis , Minnesota 55455 , United States
| | - Steven R Kass
- Department of Chemistry , University of Minnesota , 207 Pleasant Street, SE , Minneapolis , Minnesota 55455 , United States
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37
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Venkatraman V, Lethesh KC. Establishing Predictive Models for Solvatochromic Parameters of Ionic Liquids. Front Chem 2019; 7:605. [PMID: 31552223 PMCID: PMC6733962 DOI: 10.3389/fchem.2019.00605] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Accepted: 08/19/2019] [Indexed: 11/25/2022] Open
Abstract
The use of ionic liquids (ILs) in applications ranging from catalysis to reaction media in organic synthesis has been successfully demonstrated in several cases. For any given IL application, fundamental properties, such as viscosity, thermal stability, and toxicity have to be considered. Another property of interest is the polarity, which is a crucial indicator of solvent effects on chemical processes. Given the near-infinite combinations of cations and anions, experimental determination of solvatochromic parameters, such as the hydrogen-bond acidity and basicity, and dipolarity-polarizability is prohibitive. To address this, we evaluate the utility of alternative schemes based on parameters derived from COSMO-RS (COnductor-like Screening MOdel for Real Solvents) computations. The scheme is applied to a large library of yet-to-be-synthesized ionic liquids, to identify promising candidates for applications in biomass dissolution.
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Affiliation(s)
- Vishwesh Venkatraman
- Department of Chemistry, Norwegian University of Science and Technology, Trondheim, Norway
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38
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Pavlov AA, Aleshin DY, Nikovskiy IA, Polezhaev AV, Efimov NN, Korlyukov AA, Novikov VV, Nelyubina YV. New Spin-Crossover Complexes of Substituted 2,6-Bis(pyrazol-3-yl)pyridines. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900432] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Alexander A. Pavlov
- A.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences; Vavilova Str., 28 119991 Moscow Russia
- Moscow Institute of Physics and Technology; Institutskiy per., 9 141700 Dolgoprudny, Moscow Region Russia
| | - Dmitry Yu. Aleshin
- A.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences; Vavilova Str., 28 119991 Moscow Russia
- Mendeleev University of Chemical Technology of Russia; Miusskaya pl., 9 125047 Moscow Russia
| | - Igor A. Nikovskiy
- A.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences; Vavilova Str., 28 119991 Moscow Russia
| | - Alexander V. Polezhaev
- A.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences; Vavilova Str., 28 119991 Moscow Russia
- Bauman Moscow State Technical University; 2nd Baumanskaya Str., 5 105005 Moscow Russia
| | - Nikolay N. Efimov
- Kurnakov Institute of General and Inorganic Chemistry of Russian Academy of Sciences; Leninsky pr., 31 119991 Moscow Russia
| | - Alexander A. Korlyukov
- A.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences; Vavilova Str., 28 119991 Moscow Russia
| | - Valentin V. Novikov
- A.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences; Vavilova Str., 28 119991 Moscow Russia
- Moscow Institute of Physics and Technology; Institutskiy per., 9 141700 Dolgoprudny, Moscow Region Russia
| | - Yulia V. Nelyubina
- A.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences; Vavilova Str., 28 119991 Moscow Russia
- Moscow Institute of Physics and Technology; Institutskiy per., 9 141700 Dolgoprudny, Moscow Region Russia
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39
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Pereira Rodrigues G, Lopes de Lima TM, de Andrade RB, Ventura E, do Monte SA, Barbatti M. Photoinduced Formation of H-Bonded Ion Pair in HCFC-133a. J Phys Chem A 2019; 123:1953-1961. [DOI: 10.1021/acs.jpca.8b12482] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gessenildo Pereira Rodrigues
- Universidade Federal da Paraíba, 58059-900, João Pessoa-PB, Brazil
- Faculdade Rebouças, 58406-040, Campina Grande-PB, Brazil
| | | | | | - Elizete Ventura
- Universidade Federal da Paraíba, 58059-900, João Pessoa-PB, Brazil
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40
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Tracy C, Adler AM, Nguyen A, Johnson RD, Miller KM. Covalently Crosslinked 1,2,3-Triazolium-Containing Polyester Networks: Thermal, Mechanical, and Conductive Properties. ACS OMEGA 2018; 3:13442-13453. [PMID: 31458056 PMCID: PMC6644408 DOI: 10.1021/acsomega.8b01949] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Accepted: 10/05/2018] [Indexed: 05/05/2023]
Abstract
Azide-alkyne "click" cyclization was used to prepare a series of polymerizable acetoacetate monomers containing a 1,2,3-trizolium ionic liquid group. The monomers were subsequently polymerized using base-catalyzed Michael addition chemistry, producing a series of covalently crosslinked 1,2,3-triazolium poly(ionic liquid) (TPIL) networks. Structure-activity relationships were conducted to gauge how synthetic variables, such as counteranion ([Br], [NO3], [BF4], [OTf], and [NTf2]), and crosslink density (acrylate/acetoacetate ratio) effected thermal, mechanical, and conductive properties. TPIL networks were found to exhibit ionic conductivities in the range of 10-6-10-9 S/cm (30 °C, 30% relative humidity), as determined from dielectric relaxation spectroscopy, despite their highly crosslinked nature. Temperature-dependent conductivities demonstrate a dependence on polymer glass transition, with free-ion concentrations impacted by various ions' Lewis acidity/basicity and ion mobilities impacted by freely mobile anion size.
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Affiliation(s)
- Clayton
A. Tracy
- Department of Chemistry, Murray State University, 1201 Jesse D. Jones Hall, Murray, Kentucky 42071, United
States
| | - Abagail M. Adler
- Department of Chemistry, Murray State University, 1201 Jesse D. Jones Hall, Murray, Kentucky 42071, United
States
| | - Anh Nguyen
- Department of Chemistry, Murray State University, 1201 Jesse D. Jones Hall, Murray, Kentucky 42071, United
States
| | - R. Daniel Johnson
- Department of Chemistry, Murray State University, 1201 Jesse D. Jones Hall, Murray, Kentucky 42071, United
States
| | - Kevin M. Miller
- Department of Chemistry, Murray State University, 1201 Jesse D. Jones Hall, Murray, Kentucky 42071, United
States
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41
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Kapoor U, Shah JK. Molecular Origins of the Apparent Ideal CO2 Solubilities in Binary Ionic Liquid Mixtures. J Phys Chem B 2018; 122:9763-9774. [DOI: 10.1021/acs.jpcb.8b08223] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Utkarsh Kapoor
- School of Chemical Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| | - Jindal K. Shah
- School of Chemical Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, United States
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42
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Byun J, Zhang KAI. Controllable Homogeneity/Heterogeneity Switch of Imidazolium Ionic Liquids for CO2
Utilization. ChemCatChem 2018. [DOI: 10.1002/cctc.201801086] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jeehye Byun
- Max Planck institute for Polymer Research; Ackermannweg 10 Mainz 55128 Germany
| | - Kai A. I. Zhang
- Max Planck institute for Polymer Research; Ackermannweg 10 Mainz 55128 Germany
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43
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Díaz M, Cruz AS, Flores J, Guzmán A, Lima E. Highly Basic and Dipolar Layered Double Hydroxides Enhance Catalysis of Cyanoethylation of Alcohols. Catal Letters 2018. [DOI: 10.1007/s10562-018-2448-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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44
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Baschieri A, Del Secco B, Zaccheroni N, Valgimigli L, Amorati R. The Role of Onium Salts in the Pro-Oxidant Effect of Gold Nanoparticles in Lipophilic Environments. Chemistry 2018; 24:9113-9119. [PMID: 29689123 DOI: 10.1002/chem.201801110] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 04/06/2018] [Indexed: 01/11/2023]
Abstract
Metal nanoparticles are reported to be toxic due to the generation of free radicals at their surface. Relatively inert thiol-capped gold nanoparticles (AuNPs) have been reported to induce radical formation in the presence of hydroperoxides, which would conflict with their potential use as inert scaffolds for the design of novel nano-antioxidants. With the aim of clarifying this aspect, we investigated the pro-oxidant activity of dodecanethiol-capped AuNPs (∼5 nm diameter), prepared through the Brust-Schiffrin synthesis, by oxygen-uptake kinetic studies. The pro-oxidant activity was found to be proportional to the impurities of the transfer agent tetraoctylammonium bromide (TOAB) left from the synthesis and decreased on repeated washing of the nanoparticles. Under identical settings similar batches of AuNP (∼9 nm diameter) prepared through the Ulman method without onium salts showed no pro-oxidant behavior. The alternative onium phase-transfer agents Oct4 NBF4 (Oct=octyl), Hex4 NBF4 (Hex=hexyl), and Hex4 NPF6 were comparatively investigated and showed lower pro-oxidant activity depending on the counterion (Br- >PF6- >BF4- ).
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Affiliation(s)
- Andrea Baschieri
- Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126, Bologna, Italy
| | - Benedetta Del Secco
- Department of Chemistry "G. Ciamician", University of Bologna, Via F. Selmi 2, 40126, Bologna, Italy
| | - Nelsi Zaccheroni
- Department of Chemistry "G. Ciamician", University of Bologna, Via F. Selmi 2, 40126, Bologna, Italy
| | - Luca Valgimigli
- Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126, Bologna, Italy
| | - Riccardo Amorati
- Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126, Bologna, Italy
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45
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Passos H, Dinis TBV, Cláudio AFM, Freire MG, Coutinho JAP. Hydrogen bond basicity of ionic liquids and molar entropy of hydration of salts as major descriptors in the formation of aqueous biphasic systems. Phys Chem Chem Phys 2018; 20:14234-14241. [PMID: 29761193 PMCID: PMC6161817 DOI: 10.1039/c8cp01401a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Aqueous biphasic systems (ABS) composed of ionic liquids (ILs) and conventional salts have been largely investigated and successfully used in separation processes, for which the determination of the corresponding ternary phase diagrams is a prerequisite. However, due the large number of ILs that can be prepared and their high structural versatility, it is impossible to experimentally cover and characterize all possible combinations of ILs and salts that may form ABS. The development of tools for the prediction and design of IL-based ABS is thus a crucial requirement. Based on a large compilation of experimental data, a correlation describing the formation of IL-based ABS is shown here, based on the hydrogen-bonding interaction energies of ILs (EHB) obtained by the COnductor-like Screening MOdel for Real Solvents (COSMO-RS) and the molar entropy of hydration of the salt ions. The ability of the proposed model to predict the formation of novel IL-based ABS is further ascertained.
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Affiliation(s)
- Helena Passos
- CICECO - Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal.
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46
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Jamehbozorg B, Sadeghi R. Evaluation of the effect of carbohydrates as renewable, none-charged and non-toxic soluting-out agents on the ionic-liquid-based ABS implementation. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.01.093] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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47
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Butler BJ, Harper JB. The effect of the structure of the anion of an ionic liquid on the rate of reaction at a phosphorus centre. J PHYS ORG CHEM 2018. [DOI: 10.1002/poc.3819] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Bradley J. Butler
- School of Chemistry; University of New South Wales, UNSW; Sydney Australia
| | - Jason B. Harper
- School of Chemistry; University of New South Wales, UNSW; Sydney Australia
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48
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Hawker RR, Haines RS, Harper JB. The effect of varying the anion of an ionic liquid on the solvent effects on a nucleophilic aromatic substitution reaction. Org Biomol Chem 2018; 16:3453-3463. [DOI: 10.1039/c8ob00651b] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Variety of ionic liquids with different anions used as solvents for a nucleophilic aromatic substitution reaction.
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Affiliation(s)
| | | | - Jason B. Harper
- School of Chemistry
- University of New South Wales
- Sydney
- Australia
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49
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Vaz ICM, Bastos M, Bernardes CES, Canongia Lopes JN, Santos LMNBF. Solvation of alcohols in ionic liquids – understanding the effect of the anion and cation. Phys Chem Chem Phys 2018; 20:2536-2548. [DOI: 10.1039/c7cp07525a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The effect of the anion and cation nature in the solvation of alcohols in ionic liquids highlighting the R-OH anion H-bond interaction is analysed.
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Affiliation(s)
- Inês C. M. Vaz
- Centro de Investigação em Química
- Departamento de Química e Bioquímica
- Faculdade de Ciências da Universidade do Porto
- P-4169-007 Porto
- Portugal
| | - Margarida Bastos
- Centro de Investigação em Química
- Departamento de Química e Bioquímica
- Faculdade de Ciências da Universidade do Porto
- P-4169-007 Porto
- Portugal
| | - Carlos E. S. Bernardes
- Centro de Química Estrutural
- Instituto Superior Técnico
- Universidade de Lisboa
- P-1049-001 Lisboa
- Portugal
| | - José N. Canongia Lopes
- Centro de Química Estrutural
- Instituto Superior Técnico
- Universidade de Lisboa
- P-1049-001 Lisboa
- Portugal
| | - Luís M. N. B. F. Santos
- Centro de Investigação em Química
- Departamento de Química e Bioquímica
- Faculdade de Ciências da Universidade do Porto
- P-4169-007 Porto
- Portugal
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50
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Khakpay A, Scovazzo P. Reverse-selective behavior of room temperature ionic liquid based membranes for natural gas processing. J Memb Sci 2018. [DOI: 10.1016/j.memsci.2017.09.068] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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