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Blasius J, Elfgen R, Hollóczki O, Kirchner B. Glucose in dry and moist ionic liquid: vibrational circular dichroism, IR, and possible mechanisms. Phys Chem Chem Phys 2020; 22:10726-10737. [PMID: 32150178 DOI: 10.1039/c9cp06798a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ionic liquids and their mixtures with water show remarkable features in cellulose processing. For this reason, understanding the behavior of carbohydrates in ionic liquids is important. In the present study, we investigated three d-glucose isomers (α, β and open-chain) in 1-ethyl-3-methylimidazolium acetate in the presence and absence of water, through ab initio molecular dynamics simulations. In the complex hydrogen bonding network of these mixtures, the most interesting observation is that upon water addition every hydrogen bond elongates, except the glucose-glucose hydrogen bond for the open-chain and the α-form which shortens, clearly showing the beginning of the crystallization process. The ring glucose rearranges from on-top to in-plane and the open form changes from a coiled to a more linear arrangement when adding water which explains the contradiction that the center of mass distances of the glucose molecules with other glucose molecules grow while the hydrogen bonds shorten. The appearance of coiled open forms indicates that the previously suggested isomerization between these forms is possible and might play a role in the solubility of the related carbohydrates. The calculated IR and VCD spectra reveal insight into the intermolecular interactions, with good to excellent agreements with experimental spectra. Investigating the role of the cation, distances between the acidic carbon atom of the cation and the glucose carbon atom where ring closure and opening occurs are found, which are way shorter than dispersion-like interactions between aliphatic hydrocarbons.
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Affiliation(s)
- Jan Blasius
- Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstraße 4 + 6, D-53115 Bonn, Germany.
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Pressure-Dependent Stability of Imidazolium-Based Ionic Liquid/DNA Materials Investigated by High-Pressure Infrared Spectroscopy. MATERIALS 2019; 12:ma12244202. [PMID: 31847290 PMCID: PMC6947093 DOI: 10.3390/ma12244202] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 12/09/2019] [Accepted: 12/12/2019] [Indexed: 12/19/2022]
Abstract
1-Butyl-3-methylimidazolium hexafluorophosphate ([C4MIM][PF6])/DNA and 1-methyl-3-propylimidazolium hexafluorophosphate ([C3MIM][PF6])/DNA mixtures were prepared and characterized by high-pressure infrared spectroscopy. Under ambient pressure, the imidazolium C2-H and C4,5-H absorption bands of [C4MIM][PF6]/DNA mixture were red-shifted in comparison with those of pure [C4MIM][PF6]. This indicates that the C2-H and C4,5-H groups may have certain interactions with DNA that assist in the formation of the ionic liquid/DNA association. With the increase of pressure from ambient to 2.5 GPa, the C2-H and C4,5-H absorption bands of pure [C4MIM][PF6] displayed significant blue shifts. On the other hand, the imidazolium C-H absorption bands of [C4MIM][PF6]/DNA showed smaller frequency shift upon compression. This indicates that the associated [C4MIM][PF6]/DNA conformation may be stable under pressures up to 2.5 GPa. Under ambient pressure, the imidazolium C2-H and C4,5-H absorption bands of [C3MIM][PF6]/DNA mixture displayed negligible shifts in frequency compared with those of pure [C3MIM][PF6]. The pressure-dependent spectra of [C3MIM][PF6]/DNA mixture revealed spectral features similar to those of pure [C3MIM][PF6]. Our results indicate that the associated structures of [C4MIM][PF6]/DNA are more stable than those of [C3MIM][PF6]/DNA under high pressures.
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Kiefer J, Seidel B, Meyer D. Optical Spectroscopy for Analysis and Monitoring of Metalworking Fluids. APPLIED SPECTROSCOPY 2018; 72:1790-1797. [PMID: 29972317 DOI: 10.1177/0003702818789700] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
For various industrial manufacturing processes, water-based metalworking fluids (MWFs) are of high relevance due to their cooling and lubricating ability. They commonly form oil-in-water emulsions or solutions and hence their composition and stability is crucial for their performance in the metalworking process. To ensure a long service life of the MWF, intense monitoring is obligatory. However, examination techniques which display comprehensive and precise information about the actual state of the cooling lubricant in use are currently not available. The present study aims at testing the suitability of spectroscopic methods in terms of Fourier transform infrared, Raman, and laser-induced fluorescence spectroscopy for analyzing and monitoring MWFs. It is shown that all three techniques are capable of determining the initial composition, i.e., the ratio of water and concentrate. Fourier transform infrared provides the best performance regarding monitoring the state of the fluid over an extended period of time. The spectral signatures show distinct changes during a five-month service life in a technical environment.
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Affiliation(s)
- Johannes Kiefer
- Technische Thermodynamik, Universität Bremen, Germany
- School of Engineering, University of Aberdeen, UK
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- MAPEX Center for Materials and Processes, Universität Bremen, Germany
| | - Benedikt Seidel
- MAPEX Center for Materials and Processes, Universität Bremen, Germany
- Leibniz Institute for Materials Engineering IWT, Bremen, Germany
| | - Daniel Meyer
- MAPEX Center for Materials and Processes, Universität Bremen, Germany
- Leibniz Institute for Materials Engineering IWT, Bremen, Germany
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Shestakov AF, Yudina AV, Tulibaeva GZ, Shul’ga YM, Ignatova AA, Yarmolenko OV. Effect of adding ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate on the coordination environment of Li+ ions in propylene carbonate, according to data from IR spectroscopy and quantum chemical modeling. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2017. [DOI: 10.1134/s0036024417080301] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Abstract
Vibrational spectroscopy has continued use as a powerful tool to characterize ionic liquids since the literature on room temperature molten salts experienced the rapid increase in number of publications in the 1990's. In the past years, infrared (IR) and Raman spectroscopies have provided insights on ionic interactions and the resulting liquid structure in ionic liquids. A large body of information is now available concerning vibrational spectra of ionic liquids made of many different combinations of anions and cations, but reviews on this literature are scarce. This review is an attempt at filling this gap. Some basic care needed while recording IR or Raman spectra of ionic liquids is explained. We have reviewed the conceptual basis of theoretical frameworks which have been used to interpret vibrational spectra of ionic liquids, helping the reader to distinguish the scope of application of different methods of calculation. Vibrational frequencies observed in IR and Raman spectra of ionic liquids based on different anions and cations are discussed and eventual disagreements between different sources are critically reviewed. The aim is that the reader can use this information while assigning vibrational spectra of an ionic liquid containing another particular combination of anions and cations. Different applications of IR and Raman spectroscopies are given for both pure ionic liquids and solutions. Further issues addressed in this review are the intermolecular vibrations that are more directly probed by the low-frequency range of IR and Raman spectra and the applications of vibrational spectroscopy in studying phase transitions of ionic liquids.
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Affiliation(s)
- Vitor H Paschoal
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo , Av. Prof. Lineu Prestes 748, São Paulo 05508-000, Brazil
| | - Luiz F O Faria
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo , Av. Prof. Lineu Prestes 748, São Paulo 05508-000, Brazil
| | - Mauro C C Ribeiro
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo , Av. Prof. Lineu Prestes 748, São Paulo 05508-000, Brazil
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Tan X, Li X, Chen L, Xie F. Solubility of starch and microcrystalline cellulose in 1-ethyl-3-methylimidazolium acetate ionic liquid and solution rheological properties. Phys Chem Chem Phys 2016; 18:27584-27593. [DOI: 10.1039/c6cp04426c] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This study compared the solubility of starch (G50) and microcrystalline cellulose (MCC) in an ionic liquid (IL), 1-ethyl-3-methylimidazolium acetate ([Emim][OAc]), at different temperatures.
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Affiliation(s)
- Xiaoyan Tan
- Ministry of Education Engineering Research Center of Starch & Protein Processing
- Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety
- School of Food Science and Engineering
- South China University of Technology
- Guangzhou
| | - Xiaoxi Li
- Ministry of Education Engineering Research Center of Starch & Protein Processing
- Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety
- School of Food Science and Engineering
- South China University of Technology
- Guangzhou
| | - Ling Chen
- Ministry of Education Engineering Research Center of Starch & Protein Processing
- Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety
- School of Food Science and Engineering
- South China University of Technology
- Guangzhou
| | - Fengwei Xie
- School of Chemical Engineering
- The University of Queensland
- Brisbane
- Australia
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Wellner N, Siebeneck K, Scholl S. Continuous dehydration of Ionic Liquids in a falling film evaporator. Sep Purif Technol 2015. [DOI: 10.1016/j.seppur.2015.06.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Clough MT, Geyer K, Hunt PA, Mertes J, Welton T. Thermal decomposition of carboxylate ionic liquids: trends and mechanisms. Phys Chem Chem Phys 2013; 15:20480-95. [DOI: 10.1039/c3cp53648c] [Citation(s) in RCA: 188] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Kiefer J, Cöngevel MA, Roth D, Obert K, Wasserscheid P, Leipertz A. Attenuated total reflection infrared difference spectroscopy (ATR-IRDS) for quantitative reaction monitoring. APPLIED SPECTROSCOPY 2012; 66:685-688. [PMID: 22732540 DOI: 10.1366/11-06472] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Monitoring of chemical reactors is key to optimizing yield and efficiency of chemical transformation processes. Aside from tracking pressure and temperature, the measurement of the chemical composition is essential in this context. We present an infrared difference spectroscopy approach for determining the reactant (cyclooctene) and product (cyclooctane) concentrations during a catalytic hydrogenation reaction in the solvent cyclohexane, which is present in large excess. Subtracting the spectrum of the pure solvent from the reactor mixture spectra yields infrared (IR) spectra, which can ultimately be evaluated using a curve-fitting procedure based on spectral soft modeling. An important feature of our evaluation approach is that the calibration only requires recording the pure component spectra of the reactants, products, and solvent. Hence, no time-consuming preparation of mixtures for calibration is necessary. The IR concentration results are in good agreement with gas chromatography measurements.
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Affiliation(s)
- Johannes Kiefer
- School of Engineering, University of Aberdeen, Scotland, UK.
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Cruz H, Fanselow M, Holbrey JD, Seddon KR. Determining relative rates of cellulose dissolution in ionic liquids through in situ viscosity measurement. Chem Commun (Camb) 2012; 48:5620-2. [DOI: 10.1039/c2cc31487h] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Singh T, Rao KS, Kumar A. Polarity Behaviour and Specific Interactions of Imidazolium-Based Ionic Liquids in Ethylene Glycol. Chemphyschem 2011; 12:836-45. [DOI: 10.1002/cphc.201000826] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2010] [Revised: 12/08/2010] [Indexed: 11/07/2022]
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Youngs TGA, Holbrey JD, Mullan CL, Norman SE, Lagunas MC, D'Agostino C, Mantle MD, Gladden LF, Bowron DT, Hardacre C. Neutron diffraction, NMR and molecular dynamics study of glucose dissolved in the ionic liquid 1-ethyl-3-methylimidazolium acetate. Chem Sci 2011. [DOI: 10.1039/c1sc00241d] [Citation(s) in RCA: 110] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Scott DA, Renaud DE, Krishnasamy S, Meriç P, Buduneli N, Çetinkalp Ş, Liu KZ. Diabetes-related molecular signatures in infrared spectra of human saliva. Diabetol Metab Syndr 2010; 2:48. [PMID: 20630088 PMCID: PMC2914662 DOI: 10.1186/1758-5996-2-48] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/16/2010] [Accepted: 07/14/2010] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND There is an ongoing need for improvements in non-invasive, point-of-care tools for the diagnosis and prognosis of diabetes mellitus. Ideally, such technologies would allow for community screening. METHODS In this study, we employed infrared spectroscopy as a novel diagnostic tool in the prediction of diabetic status by analyzing the molecular and sub-molecular spectral signatures of saliva collected from subjects with diabetes (n = 39) and healthy controls (n = 22). RESULTS Spectral analysis revealed differences in several major metabolic components - lipid, proteins, glucose, thiocyanate and carboxylate - that clearly demarcate healthy and diseased saliva. The overall accuracy for the diagnosis of diabetes based on infrared spectroscopy was 100% on the training set and 88.2% on the validation set. Therefore, we have established that infrared spectroscopy can be used to generate complex biochemical profiles in saliva and identify several potential diabetes-associated spectral features. CONCLUSIONS Infrared spectroscopy may represent an appropriate tool with which to identify novel diseases mechanisms, risk factors for diabetic complications and markers of therapeutic efficacy. Further study into the potential utility of infrared spectroscopy as diagnostic and prognostic tool for diabetes is warranted.
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Affiliation(s)
- David A Scott
- Oral Health and Systemic Disease, University of Louisville, Louisville, S Preston St, Louisville, KY, 40292, USA
- Department of Pharmacology and Toxicology, University of Louisville, Louisville, S Preston St, Louisville, KY, 40292, USA
- Department of Microbiology and Immunology, University of Louisville, Louisville, S Preston St, Louisville, KY, 40292, USA
| | - Diane E Renaud
- Oral Health and Systemic Disease, University of Louisville, Louisville, S Preston St, Louisville, KY, 40292, USA
| | - Sathya Krishnasamy
- Endocrinology, University of Louisville, Louisville, S Jackson St, Louisville, KY, 40292, USA
| | - Pinar Meriç
- Department of Periodontology, Ege University, Bornova, İzmir, 35100, Turkey
| | - Nurcan Buduneli
- Department of Periodontology, Ege University, Bornova, İzmir, 35100, Turkey
| | - Şvetki Çetinkalp
- Metabolic Diseases and Endocrinology, Ege University, Bornova, İzmir, 35100, Turkey
| | - Kan-Zhi Liu
- Institute for Biodiagnostics, National Research Council, Ellice Avenue, Winnipeg, MB, R3B 1Y6, Canada
- Department of Oral Biology, University of Manitoba, Bannatyne Avenue, Winnipeg, MB, R3E 0W2, Canada
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Bowron DT, D’Agostino C, Gladden LF, Hardacre C, Holbrey JD, Lagunas MC, McGregor J, Mantle MD, Mullan CL, Youngs TGA. Structure and Dynamics of 1-Ethyl-3-methylimidazolium Acetate via Molecular Dynamics and Neutron Diffraction. J Phys Chem B 2010; 114:7760-8. [DOI: 10.1021/jp102180q] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- D. T. Bowron
- Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, U.K., Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB2 3RA, U.K., and School of Chemistry and Chemical Engineering/School of Mathematics and Physics, The QUILL Centre, Queen’s University Belfast, Belfast BT9 5AG, U.K
| | - C. D’Agostino
- Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, U.K., Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB2 3RA, U.K., and School of Chemistry and Chemical Engineering/School of Mathematics and Physics, The QUILL Centre, Queen’s University Belfast, Belfast BT9 5AG, U.K
| | - L. F. Gladden
- Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, U.K., Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB2 3RA, U.K., and School of Chemistry and Chemical Engineering/School of Mathematics and Physics, The QUILL Centre, Queen’s University Belfast, Belfast BT9 5AG, U.K
| | - C. Hardacre
- Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, U.K., Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB2 3RA, U.K., and School of Chemistry and Chemical Engineering/School of Mathematics and Physics, The QUILL Centre, Queen’s University Belfast, Belfast BT9 5AG, U.K
| | - J. D. Holbrey
- Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, U.K., Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB2 3RA, U.K., and School of Chemistry and Chemical Engineering/School of Mathematics and Physics, The QUILL Centre, Queen’s University Belfast, Belfast BT9 5AG, U.K
| | - M. C. Lagunas
- Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, U.K., Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB2 3RA, U.K., and School of Chemistry and Chemical Engineering/School of Mathematics and Physics, The QUILL Centre, Queen’s University Belfast, Belfast BT9 5AG, U.K
| | - J. McGregor
- Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, U.K., Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB2 3RA, U.K., and School of Chemistry and Chemical Engineering/School of Mathematics and Physics, The QUILL Centre, Queen’s University Belfast, Belfast BT9 5AG, U.K
| | - M. D. Mantle
- Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, U.K., Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB2 3RA, U.K., and School of Chemistry and Chemical Engineering/School of Mathematics and Physics, The QUILL Centre, Queen’s University Belfast, Belfast BT9 5AG, U.K
| | - C. L. Mullan
- Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, U.K., Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB2 3RA, U.K., and School of Chemistry and Chemical Engineering/School of Mathematics and Physics, The QUILL Centre, Queen’s University Belfast, Belfast BT9 5AG, U.K
| | - T. G. A. Youngs
- Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, U.K., Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB2 3RA, U.K., and School of Chemistry and Chemical Engineering/School of Mathematics and Physics, The QUILL Centre, Queen’s University Belfast, Belfast BT9 5AG, U.K
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Vibrational structure of the polyunsaturated fatty acids eicosapentaenoic acid and arachidonic acid studied by infrared spectroscopy. J Mol Struct 2010. [DOI: 10.1016/j.molstruc.2009.11.052] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Noack K, Kiefer J, Leipertz A. Concentration-Dependent Hydrogen-Bonding Effects on the Dimethyl Sulfoxide Vibrational Structure in the Presence of Water, Methanol, and Ethanol. Chemphyschem 2009; 11:630-7. [DOI: 10.1002/cphc.200900691] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Dhumal NR, Kim HJ, Kiefer J. Molecular Interactions in 1-Ethyl-3-methylimidazolium Acetate Ion Pair: A Density Functional Study. J Phys Chem A 2009; 113:10397-404. [DOI: 10.1021/jp907394v] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nilesh R. Dhumal
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, School of Computational Sciences, Korea Institute for Advanced Study, Seoul 130-722, Korea, and Lehrstuhl fuer Technische Thermodynamik and Erlangen Graduate School in Advanced Optical Technologies, University Erlangen-Nuremberg, D-91058 Erlangen, Germany
| | - Hyung J. Kim
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, School of Computational Sciences, Korea Institute for Advanced Study, Seoul 130-722, Korea, and Lehrstuhl fuer Technische Thermodynamik and Erlangen Graduate School in Advanced Optical Technologies, University Erlangen-Nuremberg, D-91058 Erlangen, Germany
| | - Johannes Kiefer
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, School of Computational Sciences, Korea Institute for Advanced Study, Seoul 130-722, Korea, and Lehrstuhl fuer Technische Thermodynamik and Erlangen Graduate School in Advanced Optical Technologies, University Erlangen-Nuremberg, D-91058 Erlangen, Germany
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