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O’Brien MH, Ranganathan R, Merunka D, Stafford AK, Bleecker SD, Peric M. Effect of Charge on the Rotation of Prolate Nitroxide Spin Probes in Room-Temperature Ionic Liquids. J Mol Liq 2024; 404:124994. [PMID: 38855052 PMCID: PMC11155483 DOI: 10.1016/j.molliq.2024.124994] [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] [Indexed: 06/11/2024]
Abstract
We have studied the rotational diffusion of two prolate nitroxide probes, the doubly negatively charged peroxylamine disulfonate (Frémy's salt - FS) and neutral di-tert-butyl nitroxide (DTBN), in a series of 1-alkyl-3-methylimidazolium tetrafluoroborate room-temperature ionic liquids (RTILs) having alkyl chain lengths from two to eight carbons using electron paramagnetic resonance (EPR) spectroscopy. Though the size and shape of the probes are reasonably similar, they behave differently due to the charge difference. The rotation of FS is anisotropic, and the rotational anisotropy increases with the alkyl chain length of the cation, while the rotation of DTBN is isotropic. The hyperfine coupling constant of DTBN decreases as a function of the alkyl chain length and is proportional to the relative permittivity of ionic liquids. On the other hand, the hyperfine coupling constant of FS increases with increasing chain length. These behaviors indicate the location of each probe in RTILs. FS is likely located in the polar region near the network of charged imidazolium ions. DTBN molecules are predominately distributed in the nonpolar domains.
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Affiliation(s)
- Meghan H. O’Brien
- Department of Physics and Astronomy, California State University, Northridge, Northridge, California 91330, United States
| | - Radha Ranganathan
- Department of Physics and Astronomy, California State University, Northridge, Northridge, California 91330, United States
| | - Dalibor Merunka
- Division of Physical Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, HR-10000 Zagreb, Croatia
| | - Alexander K. Stafford
- Department of Physics and Astronomy, California State University, Northridge, Northridge, California 91330, United States
| | - Steven D. Bleecker
- Department of Physics and Astronomy, California State University, Northridge, Northridge, California 91330, United States
| | - Miroslav Peric
- Department of Physics and Astronomy, California State University, Northridge, Northridge, California 91330, United States
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Mladenova Kattnig BY, Kattnig DR, Grampp G. High-Pressure ESR Spectroscopy: On the Rotational Motion of Spin Probes in Pressurized Ionic Liquids. J Phys Chem B 2022; 126:906-911. [PMID: 35073090 PMCID: PMC9097484 DOI: 10.1021/acs.jpcb.1c09243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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We
report high-pressure (up to 50 MPa) ESR-spectroscopic investigations
on the rotational correlation times of the nitroxide radicals 2,2,6,6-tetramethylpiperidine
1-oxyl (TEMPO), 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPOL),
and 4-amino-2,2,6,6-tetramethylpiperidine 1-oxyl (ATEMPO) in the ionic
liquids 1-ethyl-3-methylimidazolium tetrafluoroborate (emimBF4), 1-butyl-3-methylimidazolium hexafluorophosphate (bmimPF6), 1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF4), 1-methyl-3-octylimidazolium tetrafluoroborate (omimBF4), and 1-methyl-3-octylimidazolium hexafluorophosphate (omimPF6). The activation volumes (38.5–56.6 Å3) determined from pressure dependent rotational diffusion coefficients
agree well with the pressure dependent viscosities of the ionic liquids.
Experimentally, the fractional exponent of the generalized Stokes–Einstein–Debye
relation is found to be close to one.
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Affiliation(s)
| | - Daniel R. Kattnig
- Living Systems Institute, University of Exeter, Stocker Road, Exeter, EX4 4QD, U.K
| | - Guenter Grampp
- Institute of Physical and Theoretical Chemistry, Graz University of Technology, Stremayrgasse 9, A-8010 Graz, Austria
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Slade J, Merunka D, Huerta E, Peric M. Rotation of a Charged Spin Probe in Room-Temperature Ionic Liquids. J Phys Chem B 2021; 125:7435-7446. [PMID: 34197101 DOI: 10.1021/acs.jpcb.1c02471] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
X-band electron paramagnetic resonance spectroscopy has been used to investigate the rotational diffusion of a stable, positively charged nitroxide 4-trimethylammonium-2,2,6,6-tetramethylpiperidine-1-oxyl iodide (Cat-1) in a series of 1-alkyl-3-methylimidazolium tetrafluoroborate room-temperature ionic liquids (RTILs) having alkyl chain lengths from two to eight carbons. The rotation of Cat-1 is anisotropic with the preferential axis of rotation along the NO• moiety. The Stokes-Einstein-Debye law describes the mean rotational correlation time of Cat-1, assuming that the hydrodynamic radius is smaller than the van der Waals radius of the probe. This implies that the probe rotates freely, experiencing slip boundary condition, which is solvent-dependent. The rotational correlation time of Cat-1 in RTILs can very well be fitted to a power-law functionality with a singular temperature, which suggests that the apparent activation energy of rotation exhibits non-Arrhenius behavior. Compared to the rotation of perdeuterated 2,2,6,6-tetramethyl-4-oxopiperidine-1-oxyl (pDTO), which is neutral, the rotation of Cat-1 is several times slower. The rotational anisotropy, the ratio of the rotational times of pDTO and Cat-1, and the apparent activation energy indicate the transition from a homogeneously globular structure to a spongelike structure when the alkyl chain has four carbons, which is also observed in molecular dynamics computational studies. For the first time, we have been able to show that the rotational correlation time of a solute molecule can be analyzed in terms of the Cohen-Turnbull free volume theory. The Cohen-Turnbull theory fully describes the rotation of Cat-1 in all ionic liquids in the measured temperature range.
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Affiliation(s)
- Jakov Slade
- Division of Physical Chemistry, Rud̵er Bošković Institute, Bijenička cesta 54, Zagreb HR-10000, Croatia
| | - Dalibor Merunka
- Division of Physical Chemistry, Rud̵er Bošković Institute, Bijenička cesta 54, Zagreb HR-10000, Croatia
| | - Ezequiel Huerta
- Department of Physics and Astronomy and The Center for Biological Physics, California State University, Northridge, Northridge, California 91330, United States
| | - Miroslav Peric
- Department of Physics and Astronomy and The Center for Biological Physics, California State University, Northridge, Northridge, California 91330, United States
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Xu H, Du Y, Feng Z, Sun X, Liu J. Synthesis of a chiral ionic liquid, cholinium-clindamycin phosphate, as sole chiral selector in capillary electrophoresis. J Chromatogr A 2020; 1615:460721. [DOI: 10.1016/j.chroma.2019.460721] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 11/13/2019] [Accepted: 11/16/2019] [Indexed: 12/21/2022]
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5
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Rumble CA, Uitvlugt C, Conway B, Maroncelli M. Solute Rotation in Ionic Liquids: Size, Shape, and Electrostatic Effects. J Phys Chem B 2017; 121:5094-5109. [DOI: 10.1021/acs.jpcb.7b01704] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Christopher A. Rumble
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Caleb Uitvlugt
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Brian Conway
- 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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Yoshida T, Kawai A, Khara DC, Samanta A. Temporal Behavior of the Singlet Molecular Oxygen Emission in Imidazolium and Morpholinium Ionic Liquids and Its Implications. J Phys Chem B 2015; 119:6696-702. [DOI: 10.1021/acs.jpcb.5b01996] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tsuyoshi Yoshida
- Department
of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 H89 Ohokayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Akio Kawai
- Department
of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 H89 Ohokayama, Meguro-ku, Tokyo 152-8551, Japan
| | | | - Anunay Samanta
- School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
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Zhang Q, Du Y, Du S, Zhang J, Feng Z, Zhang Y, Li X. Tetramethylammonium-lactobionate: A novel ionic liquid chiral selector based on saccharides in capillary electrophoresis. Electrophoresis 2015; 36:1216-23. [DOI: 10.1002/elps.201400358] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Revised: 02/09/2015] [Accepted: 02/24/2015] [Indexed: 01/15/2023]
Affiliation(s)
- Qi Zhang
- Department of Analytical Chemistry; China Pharmaceutical University; Nanjing P. R. China
| | - Yingxiang Du
- Department of Analytical Chemistry; China Pharmaceutical University; Nanjing P. R. China
- Key Laboratory of Drug Quality Control and Pharmacovigilance (Ministry of Education); China Pharmaceutical University; Nanjing P. R. China
- State Key Laboratory of Natural Medicines; China Pharmaceutical University; Nanjing P. R. China
| | - Shuaijing Du
- College of Chemistry and Molecular Engineering; Peking University; Beijing P. R. China
| | - Jinjing Zhang
- Department of Analytical Chemistry; China Pharmaceutical University; Nanjing P. R. China
| | - Zijie Feng
- Department of Analytical Chemistry; China Pharmaceutical University; Nanjing P. R. China
| | - Yanjie Zhang
- Department of Analytical Chemistry; China Pharmaceutical University; Nanjing P. R. China
| | - Xiaoqi Li
- Department of Analytical Chemistry; China Pharmaceutical University; Nanjing P. R. China
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Zhang Q, Du Y, Du S. Evaluation of ionic liquids-coated carbon nanotubes modified chiral separation system with chondroitin sulfate E as chiral selector in capillary electrophoresis. J Chromatogr A 2014; 1339:185-91. [DOI: 10.1016/j.chroma.2014.02.003] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Revised: 02/01/2014] [Accepted: 02/03/2014] [Indexed: 11/16/2022]
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11
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Miyake Y, Akai N, Shibuya K, Kawai A. Solute Size-dependent Rotational Diffusion of Nitroxide Radicals in Ionic Liquids as Studied by EPR Spectroscopy. CHEM LETT 2013. [DOI: 10.1246/cl.130682] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Yusuke Miyake
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology
| | - Nobuyuki Akai
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology
| | - Kazuhiko Shibuya
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology
| | - Akio Kawai
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology
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Zhang Q, Du Y. Evaluation of the enantioselectivity of glycogen-based synergistic system with amino acid chiral ionic liquids as additives in capillary electrophoresis. J Chromatogr A 2013; 1306:97-103. [PMID: 23910600 DOI: 10.1016/j.chroma.2013.07.053] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2013] [Revised: 07/14/2013] [Accepted: 07/15/2013] [Indexed: 11/25/2022]
Abstract
In this paper, two novel amino acid chiral ILs, tetramethylammonium-l-arginine (TMA-l-Arg) and tetramethylammonium-l-aspartic acid (TMA-l-Asp), were applied for the first time in CE enantioseparation to evaluate their potential synergistic effect with glycogen as chiral selector. As observed, significantly improved separation of tested enantiomers were obtained in the chiral ILs/glycogen synergistic systems compared to the single glycogen separation system. Several primary parameters affecting the enantioseparation, such as amino acid ILs (AAILs) concentration, glycogen concentration and buffer pH, were systematically investigated. An achiral tetramethylammonium hydroxide ionic liquid (TMA-OH) modified separation system was also evaluated to validate the superiority of the novel chiral ILs/glycogen synergistic systems. To further optimize the overall synergistic systems, the effect of three other parameters, including buffer concentration, applied voltage and capillary temperature were simultaneously analyzed by a central composite design (CCD), and excellent enantioseparations were achieved with the optimized parameters. The results indicate that the application of chiral ILs/glycogen synergistic systems is a promising way in chiral separation science.
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Affiliation(s)
- Qi Zhang
- Department of Analytical Chemistry, China Pharmaceutical University, Nanjing 210009, PR China
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Guchhait B, Biswas R. Ionic arrest of segmental motion and emergence of spatio-temporal heterogeneity: A fluorescence investigation of (polyethylene glycol + electrolyte) composites. J Chem Phys 2013; 138:114909. [DOI: 10.1063/1.4795583] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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14
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Mladenova BY, Chumakova NA, Pergushov VI, Kokorin AI, Grampp G, Kattnig DR. Rotational and Translational Diffusion of Spin Probes in Room-Temperature Ionic Liquids. J Phys Chem B 2012; 116:12295-305. [DOI: 10.1021/jp306583g] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Boryana Y. Mladenova
- Institute of Physical and Theoretical
Chemistry, Graz University of Technology, Stremayrgasse 9, A-8010 Graz, Austria
| | | | | | | | - Günter Grampp
- Institute of Physical and Theoretical
Chemistry, Graz University of Technology, Stremayrgasse 9, A-8010 Graz, Austria
| | - Daniel R. Kattnig
- Institute of Physical and Theoretical
Chemistry, Graz University of Technology, Stremayrgasse 9, A-8010 Graz, Austria
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15
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Nishiyama Y, Terazima M, Kimura Y. Ultrafast Relaxation and Reaction of Diiodide Anion after Photodissociation of Triiodide in Room-Temperature Ionic Liquids. J Phys Chem B 2012; 116:9023-32. [DOI: 10.1021/jp212299c] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yoshio Nishiyama
- Department of Chemistry, Graduate
School of Science, Kyoto University, Kyoto
606-8502, Japan
| | - Masahide Terazima
- Department of Chemistry, Graduate
School of Science, Kyoto University, Kyoto
606-8502, Japan
| | - Yoshifumi Kimura
- Department of Chemistry, Graduate
School of Science, Kyoto University, Kyoto
606-8502, Japan
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16
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Karve L, Dutt GB. Role of Specific Interactions on the Rotational Diffusion of Organic Solutes in a Protic Ionic Liquid–Propylammonium Nitrate. J Phys Chem B 2012; 116:9107-13. [DOI: 10.1021/jp303761f] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Lalita Karve
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - G. B. Dutt
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
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18
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Strehmel V, Rexhausen H, Strauch P. New spin probes starting from 4-amino-2,2,6,6-tetramethylpiperidine-1-yloxyl. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.01.063] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Karve L, Dutt GB. Rotational Diffusion of Neutral and Charged Solutes in 1-Butyl-3-Methylimidazolium-Based Ionic Liquids: Influence of the Nature of the Anion on Solute Rotation. J Phys Chem B 2012; 116:1824-30. [DOI: 10.1021/jp208394n] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Lalita Karve
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - G. B. Dutt
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
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Cao J, Li P, Yi L. Ionic liquids coated multi-walled carbon nanotubes as a novel pseudostationary phase in electrokinetic chromatography. J Chromatogr A 2011; 1218:9428-34. [PMID: 22119676 DOI: 10.1016/j.chroma.2011.11.013] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2011] [Revised: 11/05/2011] [Accepted: 11/08/2011] [Indexed: 01/07/2023]
Abstract
A new CE system using ionic liquids coated multi-walled carbon nanotubes (ILs-MWNTs) as pseudostationary phase was developed for the simultaneous determination of four flavonoids, four phenolic acids and two saponins. Several parameters affecting the separation were studied, including the choice of ILs, ILs-MWNTs concentration, the respective use of ILs and MWNTs, buffer pH, SDS concentration and borate content. Results revealed that the addition of ILs-MWNTs in running electrolytes enhanced the separation of target compounds compared to conventional micelle because the surface of carbon nanotubes interacted favorably with the analytes. Under the optimum conditions, a baseline separation was achieved for these analytes within 11 min in a 41.5 cm of effective length fused-silica capillary. At a voltage of 28.0 kV, the separation was carried out in a 10mM borate buffer (pH 9.0) containing 100mM SDS, 6% propanol and 4 μg mL(-1) ILs-MWNTs. All calibration curves showed good linearity (r(2)>0.9990) within the test ranges. The intra- and inter-day precisions as determined from standard solutions were below 3.30% and 6.23%, respectively. The recoveries for ten compounds were found to range from 85.5 to 101.8%. The method was successfully applied for the determination of three types of compounds in Qishenyiqi dropping pills. Our experimental results indicated that the proposed method offered new opportunities for the analysis of complex samples.
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Affiliation(s)
- Jun Cao
- College of Material Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, China.
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Miyoshi E, Naka K, Tanaka K, Narita A, Chujo Y. Preparation of clusters having various interparticle distances based on imidazolium-modified gold nanoparticles via anion exchange. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2011.09.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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