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Zhuravlev OE. Effect of the Structure of Imidazolium Ionic Liquids on the Electrical Conductivity and Processes of Ionic Association in Acetonitrile Solutions. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2021. [DOI: 10.1134/s0036024421020308] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Gondal HY, Mumtaz S, Abbaskhan A, Mumtaz N, Cano I. New alkoxymethyl-functionalized pyridinium-based chiral ionic liquids: synthesis, characterization and properties. CHEMICAL PAPERS 2020. [DOI: 10.1007/s11696-020-01135-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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3
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Sintra TE, Gantman MG, Ventura SP, Coutinho JA, Wasserscheid P, Schulz PS. Synthesis and characterization of chiral ionic liquids based on quinine, l-proline and l-valine for enantiomeric recognition. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.03.084] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Abstract
Chiral ionic liquid crystals based on the S-methyl-N,N′-α-methylarylthiouronium cation have been prepared and studied.
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Greño M, Marina ML, Castro-Puyana M. Enantioseparation by Capillary Electrophoresis Using Ionic Liquids as Chiral Selectors. Crit Rev Anal Chem 2018; 48:429-446. [PMID: 29641220 DOI: 10.1080/10408347.2018.1439365] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Capillary electrophoresis (CE) is one of the most widely employed analytical techniques to achieve enantiomeric separations. In spite of the fact that there are many chiral selectors commercially available to perform enantioseparations by CE, one of the most relevant topics in this field is the search for new selectors capable of providing high enantiomeric resolutions. Chiral ionic liquids (CILs) have interesting characteristics conferring them a high potential in chiral separations although only some of them are commercially available. The aim of this article is to review all the works published on the use of CILs as chiral selectors in the development of enantioselective methodologies by CE, covering the period from 2006 (when the first research work on this topic was published) to 2017. The use of CILs as sole chiral selectors, as chiral selectors in dual systems or as chiral ligands will be considered. This review also provides detailed analytical information on the experimental conditions used to carry out enantioseparations in different fields as well as on the separation mechanism involved.
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Affiliation(s)
- Maider Greño
- a Departamento de Química Analítica , Química Física e Ingeniería Química, Universidad de Alcalá , Alcalá de Henares, Madrid , Spain
| | - María Luisa Marina
- a Departamento de Química Analítica , Química Física e Ingeniería Química, Universidad de Alcalá , Alcalá de Henares, Madrid , Spain.,b Instituto de Investigación Química Andrés M. del Río, Universidad de Alcalá , Alcalá de Henares, Madrid , Spain
| | - María Castro-Puyana
- a Departamento de Química Analítica , Química Física e Ingeniería Química, Universidad de Alcalá , Alcalá de Henares, Madrid , Spain.,b Instituto de Investigación Química Andrés M. del Río, Universidad de Alcalá , Alcalá de Henares, Madrid , Spain
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Janus E, Gano M, Feder-Kubis J, Sośnicki J. Chiral protic imidazolium salts with a (-)-menthol fragment in the cation: synthesis, properties and use in the Diels-Alder reaction. RSC Adv 2018; 8:10318-10331. [PMID: 35702623 PMCID: PMC9115648 DOI: 10.1039/c7ra12176h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Accepted: 03/05/2018] [Indexed: 11/21/2022] Open
Abstract
New chiral protic imidazolium salts containing a (1R,2S,5R)-(-)-menthol substituent in the cation and four different anions (chloride, hexafluorophosphate, trifluoromethanesulfonate and bis(trifluoromethylsulfonyl)imide) were efficiently prepared and extensively characterized. Detailed NMR analysis was performed, and a comparison of the chemical shifts of the protons and carbons of the imidazolium cation as a function of the combined anion was discussed. The specific rotation, solubility in commonly used solvents, thermal properties including phase transition temperatures, and thermal stability were also determined. Three of the synthesized tertiary salts (Cl, PF6 or OTf anion) were crystalline solids; 1-H-3-[(1R,2S,5R)-(-)-menthoxymethyl]-imidazolium bis(trifluoromethylsulfonyl)imide, (-)[H-Ment-Im][NTf2] was a liquid at room temperature. The chiral protic salts were used in a Diels-Alder reaction as a test reaction, and the results were compared with those from aprotic chiral ionic liquids having the same chiral substituent in the cation (1R,2S,5R)-(-)-menthol with a bis(trifluoromethylsulfonyl)imide anion. Both protic and aprotic chiral salts, used in a Diels-Alder reaction, were pure (-)-enantiomers, which was determined by NMR with Δ-TRISPHAT tetrabutylammonium salt as a chiral shift reagent. Protic salts offered distinctly higher endo/exo ratios than aprotic ones, but an enantiomeric excess was not obtained. The stereoselectivity reached the same high level even after the fourth recycle of (-)[H-Ment-Im][NTf2] in the reaction of ethyl-vinyl ketone with cyclopentadiene at temperature of -35 °C.
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Affiliation(s)
- Ewa Janus
- West Pomeranian University of Technology Szczecin, Faculty of Chemical Technology and Engineering, Institute of Chemical Organic Technology Pułaski Str. 10 70-322 Szczecin Poland +48 91 4494584
| | - Marcin Gano
- West Pomeranian University of Technology Szczecin, Faculty of Chemical Technology and Engineering, Institute of Chemical Organic Technology Pułaski Str. 10 70-322 Szczecin Poland +48 91 4494584
| | - Joanna Feder-Kubis
- Wrocław University of Science and Technology, Faculty of Chemistry Wybrzeże Wyspiańskiego 27 50-370 Wrocław Poland
| | - Jacek Sośnicki
- West Pomeranian University of Technology Szczecin, Faculty of Chemical Technology and Engineering, Department of Organic and Physical Chemistry Al. Piastów 42 71-065 Szczecin Poland
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Physical-chemical properties of chiral ionic liquids derived from the phenylethylamine enantiomers. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.04.053] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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8
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Gunaratne HQN, Laaksonen T, Seddon KR, Wähälä K. 1-(+)-Dehydroabietylimidazolium Salts as Enantiomer Discriminators for NMR Spectroscopy. Aust J Chem 2017. [DOI: 10.1071/ch16545] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Nine new (+)-dehydroabietylimidazolium salts were synthesised and studied as chiral solvating agents for several different racemic aromatic and non-aromatic carboxylate salts. These cationic chiral solvating agents resolve racemic ionic analytes better than non-ionic ones. Bis(dehydroabietylimidazolium) bis(trifluoromethanesulfonimide) gave the best discrimination for the enantiomers of carboxylate salts. Its resolution behaviour was studied by an NMR titration experiment, which indicated 1 : 1 complexation with the racemic analyte. The dehydroabietylimidazolium salts were also useful in enantiomeric excess (ee) determinations, and for the recognition of chirality of racemic aromatic and non-aromatic α-substituted carboxylic acids.
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Firaha DS, Thomas M, Hollóczki O, Korth M, Kirchner B. Can dispersion corrections annihilate the dispersion-driven nano-aggregation of non-polar groups? An ab initio molecular dynamics study of ionic liquid systems. J Chem Phys 2016; 145:204502. [DOI: 10.1063/1.4967861] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Dzmitry S. Firaha
- Mulliken Center for Theoretical Chemistry, Rheinische Friedrich-Wilhelms-Universität Bonn, Beringstr. 4+6, D-53115 Bonn, Germany
| | - Martin Thomas
- Mulliken Center for Theoretical Chemistry, Rheinische Friedrich-Wilhelms-Universität Bonn, Beringstr. 4+6, D-53115 Bonn, Germany
| | - Oldamur Hollóczki
- Mulliken Center for Theoretical Chemistry, Rheinische Friedrich-Wilhelms-Universität Bonn, Beringstr. 4+6, D-53115 Bonn, Germany
| | - Martin Korth
- Institut für Theoretische Chemie, Universität Ulm, Albert-Einstein-Allee 11, 89069 Ulm, Germany
| | - Barbara Kirchner
- Mulliken Center for Theoretical Chemistry, Rheinische Friedrich-Wilhelms-Universität Bonn, Beringstr. 4+6, D-53115 Bonn, Germany
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Caporali S, Chiappe C, Ghilardi T, Iuliano A, Longhi G, Margari P, Pomelli CS. Arrangements of enantiopure and racemic ionic liquids at the liquid/air interface: the role of chirality on self-assembly and layering. RSC Adv 2016. [DOI: 10.1039/c5ra23553g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
This paper reports on the self-assembly ability at the interface IL/air for some couples of enantiopure and racemic chiral ILs.
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Affiliation(s)
- S. Caporali
- Dipartimento di Chimica “Ugo Schiff”
- Università di Firenze
- 50019 Sesto Fiorentino
- Italy
| | - C. Chiappe
- Dipartimento di Farmacia
- Università di Pisa
- 56126 Pisa
- Italy
| | - T. Ghilardi
- Dipartimento di Farmacia
- Università di Pisa
- 56126 Pisa
- Italy
| | - A. Iuliano
- Dipartimento di Chimica e Chimica Industriale
- Università di Pisa
- Pisa
- Italy
| | - G. Longhi
- Dipartimento di Medicina Molecolare e Traslazionale
- Università di Brescia
- 25123 Brescia
- Italy
| | - P. Margari
- Dipartimento di Farmacia
- Università di Pisa
- 56126 Pisa
- Italy
| | - C. S. Pomelli
- Dipartimento di Farmacia
- Università di Pisa
- 56126 Pisa
- Italy
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Hollóczki O, Macchiagodena M, Weber H, Thomas M, Brehm M, Stark A, Russina O, Triolo A, Kirchner B. Triphilic Ionic-Liquid Mixtures: Fluorinated and Non-fluorinated Aprotic Ionic-Liquid Mixtures. Chemphyschem 2015; 16:3325-33. [PMID: 26305804 PMCID: PMC4641458 DOI: 10.1002/cphc.201500473] [Citation(s) in RCA: 102] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Revised: 07/16/2015] [Indexed: 11/20/2022]
Abstract
We present here the possibility of forming triphilic mixtures from alkyl- and fluoroalkylimidazolium ionic liquids, thus, macroscopically homogeneous mixtures for which instead of the often observed two domains-polar and nonpolar-three stable microphases are present: polar, lipophilic, and fluorous ones. The fluorinated side chains of the cations indeed self-associate and form domains that are segregated from those of the polar and alkyl domains. To enable miscibility, despite the generally preferred macroscopic separation between fluorous and alkyl moieties, the importance of strong hydrogen bonding is shown. As the long-range structure in the alkyl and fluoroalkyl domains is dependent on the composition of the liquid, we propose that the heterogeneous, triphilic structure can be easily tuned by the molar ratio of the components. We believe that further development may allow the design of switchable, smart liquids that change their properties in a predictable way according to their composition or even their environment.
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Affiliation(s)
- Oldamur Hollóczki
- Mulliken Center for Theoretical Chemistry, Rheinische Friedrich-Wilhelms-Universität BonnBeringstr. 4+6, 53115, Bonn (Germany) E-mail:
| | - Marina Macchiagodena
- Mulliken Center for Theoretical Chemistry, Rheinische Friedrich-Wilhelms-Universität BonnBeringstr. 4+6, 53115, Bonn (Germany) E-mail:
| | - Henry Weber
- Mulliken Center for Theoretical Chemistry, Rheinische Friedrich-Wilhelms-Universität BonnBeringstr. 4+6, 53115, Bonn (Germany) E-mail:
| | - Martin Thomas
- Mulliken Center for Theoretical Chemistry, Rheinische Friedrich-Wilhelms-Universität BonnBeringstr. 4+6, 53115, Bonn (Germany) E-mail:
| | - Martin Brehm
- Helmholtz-Zentrum für Umweltforschung Leipzig, Department Ökologische ChemiePermoserstrasse 15, 04318, Leipzig (Germany)
| | - Annegret Stark
- SMRI Sugarcane Biorefinery Research Chair, University of KwaZulu-Natal, College of Agriculture, Engineering and Science School of EngineeringHoward College Campus, Durban (South Africa)
| | - Olga Russina
- Department of Chemistry, Sapienza University of Rome00185, Rome (Italy)
| | - Alessandro Triolo
- Laboratorio Liquidi Ionici, Istituto Struttura della Materia, Consiglio Nazionale delle Ricerche00133, Rome (Italy)
| | - Barbara Kirchner
- Mulliken Center for Theoretical Chemistry, Rheinische Friedrich-Wilhelms-Universität BonnBeringstr. 4+6, 53115, Bonn (Germany) E-mail:
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Vasiloiu M, Cervenka I, Gaertner P, Weil M, Schröder C, Bica K. Amino alcohol-derived chiral ionic liquids: structural investigations toward chiral recognition. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.tetasy.2015.08.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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13
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Jadhav AH, Lee K, Koo S, Seo JG. Esterification of carboxylic acids with alkyl halides using imidazolium based dicationic ionic liquids containing bis-trifluoromethane sulfonimide anions at room temperature. RSC Adv 2015. [DOI: 10.1039/c5ra00802f] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Task-specific RTILs of symmetrical N-methylimidazolium rings linked to an oligo (ethylene glycol) chain (cationic part) and bis-trifluoromethane sulfonimide (anionic part) were synthesized, and the physicochemical properties with catalytic activity were determined.
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Affiliation(s)
- Arvind H. Jadhav
- Department of Energy Science and Technology
- Energy and Environment Fusion Technology Center
- Myongji University
- Yongin-si
- Republic of Korea
| | - Kyuyoung Lee
- Department of Energy Science and Technology
- Energy and Environment Fusion Technology Center
- Myongji University
- Yongin-si
- Republic of Korea
| | - Sangho Koo
- Department of Energy Science and Technology
- Energy and Environment Fusion Technology Center
- Myongji University
- Yongin-si
- Republic of Korea
| | - Jeong Gil Seo
- Department of Energy Science and Technology
- Energy and Environment Fusion Technology Center
- Myongji University
- Yongin-si
- Republic of Korea
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Shekaari H, Kazempour A, Khoshalhan M. Conductometric study of ionic liquids in the presence of N,N′-bis(2-pyridylmethylidene)-1,2-diiminoethane (BPIE) Schiff base in acetonitrile solutions at 298.15K. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2014.09.101] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Kapnissi-Christodoulou CP, Stavrou IJ, Mavroudi MC. Chiral ionic liquids in chromatographic and electrophoretic separations. J Chromatogr A 2014; 1363:2-10. [DOI: 10.1016/j.chroma.2014.05.059] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2014] [Revised: 05/17/2014] [Accepted: 05/20/2014] [Indexed: 02/07/2023]
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