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Yue K, Doherty B, Acevedo O. Comparison between Ab Initio Molecular Dynamics and OPLS-Based Force Fields for Ionic Liquid Solvent Organization. J Phys Chem B 2022; 126:3908-3919. [PMID: 35594504 DOI: 10.1021/acs.jpcb.2c01636] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OPLS-based force fields (FFs) have been shown to provide accurate bulk-phase properties for a wide variety of imidazolium-based ionic liquids (ILs). However, the ability of OPLS to reproduce an IL solvent structure is not as well-validated given the relative lack of high-level theoretical or experimental data available for comparison. In this study, ab initio molecular dynamics (AIMD) simulations were performed for three widely used ILs: the 1-butyl-3-methylimidazolium cation with chloride, tetrafluoroborate, or hexafluorophosphate anions, that is, [BMIM][Cl], [BMIM][BF4], and [BMIM][PF6], respectively, as a basis for further assessment of two unique IL FFs: the ±0.8 charge-scaled OPLS-2009IL FF and the OPLS-VSIL FF. The OPLS-2009IL FF employs a traditional all-atom functional form, whereas the OPLS-VSIL FF was developed using a virtual site that offloads negative charge to inside the plane of the ring with careful attention given to reproducing hydrogen bonding. Detailed comparisons between AIMD and the OPLS FFs were made based on radial distribution functions (RDFs), combined distribution functions (CDFs), and spatial distribution functions (SDFs) to examine cation-anion interactions and π+-π+ stacking between the imidazolium rings. While both FFs were able to correctly capture the general solvent structure of these popular ILs, the OPLS-VSIL FF quantitatively reproduced interaction distances more accurately. In addition, this work provides further insights into the different short- and long-range structure patterns of these popular ILs.
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Affiliation(s)
- Kun Yue
- Department of Chemistry, University of Miami, Coral Gables, Florida 33146, United States
| | - Brian Doherty
- Department of Chemistry, University of Miami, Coral Gables, Florida 33146, United States
| | - Orlando Acevedo
- Department of Chemistry, University of Miami, Coral Gables, Florida 33146, United States
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2
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Avula NVS, Karmakar A, Kumar R, Balasubramanian S. Efficient Parametrization of Force Field for the Quantitative Prediction of the Physical Properties of Ionic Liquid Electrolytes. J Chem Theory Comput 2021; 17:4274-4290. [PMID: 34097391 DOI: 10.1021/acs.jctc.1c00268] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The prediction of transport properties of room-temperature ionic liquids from nonpolarizable force field-based simulations has long been a challenge. The uniform charge scaling method has been widely used to improve the agreement with the experiment by incorporating the polarizability and charge transfer effects in an effective manner. While this method improves the performance of the force fields, this prescription is ad hoc in character; further, a quantitative prediction is still not guaranteed. In such cases, the nonbonded interaction parameters too need to be refined, which requires significant effort. In this work, we propose a three-step semiautomated refinement procedure based on (1) atomic site charges obtained from quantum calculations of the bulk condensed phase; (2) quenched Monte Carlo optimizer to shortlist suitable force field candidates, which are then tested using pilot simulations; and (3) manual refinement to further improve the accuracy of the force field. The strategy is designed in a sequential manner with each step improving the accuracy over the previous step, allowing the users to invest the effort commensurate with the desired accuracy of the refined force field. The refinement procedure is applied on N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium bis(trifluoromethanesulfonyl)imide (DEME-TFSI), a front-runner as an electrolyte for electric double-layer capacitors and single-molecule-based devices. The transferability of the refined force field is tested on N,N-dimethyl-N-ethyl-N-methoxyethoxyethylammonium bis(trifluoromethanesulfonyl)imide (N112,2O2O1-TFSI). The refined force field is found to be better at predicting both structural and transport properties compared to the uniform charge scaling procedure, which showed a discrepancy in the X-ray structure factor. The refined force field showed quantitative agreement with structural (density and X-ray structure factor) and transport properties-diffusion coefficients, ionic conductivity, and shear viscosity over a wide temperature range, building a case for the wide adoption of the procedure.
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Affiliation(s)
- Nikhil V S Avula
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
| | - Anwesa Karmakar
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
| | - Rahul Kumar
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
| | - Sundaram Balasubramanian
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
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3
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Palumbo O, Paolone A, Campetella M, Ramondo F, Cappelluti F, Gontrani L. New insights into chloromethyl-oxirane and chloromethyl-thiirane in liquid and solid phase from low-temperature infrared spectroscopy and ab initio modeling. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 247:119061. [PMID: 33091738 DOI: 10.1016/j.saa.2020.119061] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 10/02/2020] [Accepted: 10/06/2020] [Indexed: 06/11/2023]
Abstract
A detailed study of the conformational landscape of chloromethyl-oxirane and chloromethyl-thiirane is here reported. The equilibrium of the three different conformers of the two molecules was assessed, using a joint approach of experimental and theoretical methods. High quality infrared spectroscopy measurements of the liquid and of the crystalline phases were interpreted with the aid of ab initio Molecular Dynamics (AIMD) simulations, anharmonic frequencies and free energy calculations, obtaining a very good reproduction of the experimental data. The modulation of the conformational equilibrium upon the addition of polar and non-polar solvents was computationally evaluated and results found a confirmation in experimental measures.
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Affiliation(s)
- O Palumbo
- CNR-ISC, UOS La Sapienza, P. le A. Moro 5, 00185 Roma, Italy
| | - A Paolone
- CNR-ISC, UOS La Sapienza, P. le A. Moro 5, 00185 Roma, Italy
| | - M Campetella
- Dipartimento di Chimica, Università degli Studi di Roma, P. le Aldo Moro 5, 00185 Roma, Italy
| | - F Ramondo
- Dipartimento di Chimica, Università degli Studi di Roma, P. le Aldo Moro 5, 00185 Roma, Italy
| | - F Cappelluti
- Dipartimento di Ingegneria e Scienza dell'Informazione e Matematica, Università dell'Aquila, Via Vetoio 5, Coppito, 67100 L'Aquila, Italy.
| | - L Gontrani
- Dipartimento di Chimica, Università degli Studi di Roma, P. le Aldo Moro 5, 00185 Roma, Italy; Dipartimento di Ingegneria Industriale, Università di Roma "Tor Vergata", Viale degli ingegneri, I-00133 Roma, Italy.
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4
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New Insights into the Structure of Glycols and Derivatives: A Comparative X-Ray Diffraction, Raman and Molecular Dynamics Study of Ethane-1,2-Diol, 2-Methoxyethan-1-ol and 1,2-Dimethoxy Ethane. CRYSTALS 2020. [DOI: 10.3390/cryst10111011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
In this study, we report a detailed experimental and theoretical investigation of three glycol derivatives, namely ethane-1,2-diol, 2-methoxyethan-1-ol and 1,2-dimethoxy ethane. For the first time, the X-ray spectra of the latter two liquids was measured at room temperature, and they were compared with the newly measured spectrum of ethane-1,2-diol. The experimental diffraction patterns were interpreted very satisfactorily with molecular dynamics calculations, and suggest that in liquid ethane-1,2-diol most molecules are found in gauche conformation, with intramolecular hydrogen bonds between the two hydroxyl groups. Intramolecular H-bonds are established in the mono-alkylated diol, but the interaction is weaker. The EDXD study also evidences strong intermolecular hydrogen-bond interactions, with short O···O correlations in both systems, while longer methyl-methyl interactions are found in 1,2-dimethoxy ethane. X-ray studies are complemented by micro Raman investigations at room temperature and at 80 °C, that confirm the conformational analysis predicted by X-ray experiments and simulations.
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5
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Campetella M, Cappelluti F, Gontrani L. Medium range interactions evidences in compounds with aliphatic lateral chain: 1-pentanoic acid, 1-pentanol and pentylammonium nitrate as test cases. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.136738] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ramondo F, Gontrani L, Campetella M. Coupled hydroxyl and ether functionalisation in EAN derivatives: the effect of hydrogen bond donor/acceptor groups on the structural heterogeneity studied with X-ray diffractions and fixed charge/polarizable simulations. Phys Chem Chem Phys 2019; 21:11464-11475. [PMID: 31112158 DOI: 10.1039/c9cp00571d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present a study by energy-dispersive X-ray diffraction of liquid 2-(2-hydroxyethoxy)ethan-1-ammonium nitrate, NH3CH2CH2(OCH2CH2OH)+NO3- (22HHEAN). This ionic liquid is derived from the parent ethylammonium nitrate (EAN) with an ether link in the chain and a hydroxyl group in the terminal position. The absence of peaks at low-q values in the experimental diffraction curve indicates that the added polar groups and the high conformational isomerism of the cations alter strongly the nanosegregation of the parent EAN liquid. Aggregation between ionic species may involve hydrogen bonding between cations and anions and a variety of intermolecular hydrogen bonds between cations. Diffraction patterns are compared with the results of molecular dynamics simulations with two different force fields: the fixed point charge force field (GAFF) with different charge scaling protocols and the polarizable AMOEBA force field. Most point charge models lead to the appearance of a quite evident low q-peak which decreases gradually, when the percentage and type of the scaling (uniform vs. non-uniform) are increased. In the polarisable model and in the model where only anion charges are scaled to 20%, instead, the pre-peak is absent in agreement with our experiments.
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Affiliation(s)
- Fabio Ramondo
- Department of Physical and Chemical Sciences, University of L'Aquila, Via Vetoio I-67100, L'Aquila, Italy
| | - Lorenzo Gontrani
- Department of Chemistry "Giacomo Ciamician", University of Bologna, Via Selmi, 2, I-40126 Bologna, Italy. and Department of Chemistry, University "La Sapienza", Roma Piazzale Aldo Moro 5, I-00185, Roma, Italy
| | - Marco Campetella
- Department of Chemistry, University "La Sapienza", Roma Piazzale Aldo Moro 5, I-00185, Roma, Italy and Chimie ParisTech, PSL Research University, CNRS, Institut de Recherche de Chimie Paris, F-75005 Paris, France
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7
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Gontrani L, Trequattrini F, Palumbo O, Bencivenni L, Paolone A. New Experimental Evidences Regarding Conformational Equilibrium in Ammonium−Bis(trifluoromethanesulfonyl)imide Ionic Liquids. Chemphyschem 2018; 19:2776-2781. [DOI: 10.1002/cphc.201800442] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Lorenzo Gontrani
- Dipartimento di Chimica; Sapienza Università di Roma; Piazzale A. Moro 5 I-00185 Roma Italy
- Present address: Dipartimento di Chimica “Giacomo Ciamician”; Università di Bologna; Via F. Selmi 2 I-40126 - Bologna Italy
| | - Francesco Trequattrini
- Istituto dei Sistemi Complessi, U.O.S. La Sapienza; Consiglio Nazionale delle Ricerche; Piazzale A. Moro 5 I-00185 Roma Italy
- Dipartimento di Fisica; Sapienza Università di Roma; Piazzale A. Moro 5 I-00185 Roma Italy
| | - Oriele Palumbo
- Istituto dei Sistemi Complessi, U.O.S. La Sapienza; Consiglio Nazionale delle Ricerche; Piazzale A. Moro 5 I-00185 Roma Italy
| | - Luigi Bencivenni
- Dipartimento di Chimica; Sapienza Università di Roma; Piazzale A. Moro 5 I-00185 Roma Italy
| | - Annalisa Paolone
- Istituto dei Sistemi Complessi, U.O.S. La Sapienza; Consiglio Nazionale delle Ricerche; Piazzale A. Moro 5 I-00185 Roma Italy
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Avula NVS, Mondal A, Balasubramanian S. Charge Environment and Hydrogen Bond Dynamics in Binary Ionic Liquid Mixtures: A Computational Study. J Phys Chem Lett 2018; 9:3511-3516. [PMID: 29883123 DOI: 10.1021/acs.jpclett.8b01481] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The extent of charge transfer between the cation and the anion in a room-temperature ionic liquid depends on the basicity of the anion. Ion charges determined in the condensed state via density functional theory calculations capture this effect rather well, and charges derived in such a manner have been employed in force field-based molecular dynamics simulations to quantitatively reproduce several physical properties of the liquids. However, the issue of transferability of cation charges in mixtures of ionic liquids, say with one type of cation and two different anion types needs to be addressed. Herein, we demonstrate that the cation charge in such a mixture varies linearly with anion composition, a result that ties in rather well with X-ray photoelectron spectroscopic experiments. The variation in cation charge with bulk anion composition is shown to be a result of changes in its coordination environment. Cations surrounded by a higher proportion of more basic anions possess lower charges than those surrounded by less basic anions. Time scales for the exchange of anion types for the occupation of hydrogen bonding sites around the cation have been determined and are seen to be constituted by three processes-breakage of existing hydrogen bond, diffusion to the hydrogen bonding site and displacement of the incumbent anion from its site in the cation coordination shell. These time scales explain the differences observed between infrared and NMR spectroscopic experiments in ionic liquid mixtures rather well.
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Affiliation(s)
- Nikhil V S Avula
- Chemistry and Physics of Materials Unit , Jawaharlal Nehru Centre for Advanced Scientific Research , Bangalore 560064 , India
| | - Anirban Mondal
- Chemistry and Physics of Materials Unit , Jawaharlal Nehru Centre for Advanced Scientific Research , Bangalore 560064 , India
| | - Sundaram Balasubramanian
- Chemistry and Physics of Materials Unit , Jawaharlal Nehru Centre for Advanced Scientific Research , Bangalore 560064 , India
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9
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Campetella M, Mariani A, Sadun C, Wu B, Castner EW, Gontrani L. Structure and dynamics of propylammonium nitrate-acetonitrile mixtures: An intricate multi-scale system probed with experimental and theoretical techniques. J Chem Phys 2018; 148:134507. [PMID: 29626911 DOI: 10.1063/1.5021868] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
In this article, we report the study of structural and dynamical properties for a series of acetonitrile/propylammonium nitrate mixtures as a function of their composition. These systems display an unusual increase in intensity in their X-ray diffraction patterns in the low-q regime, and their 1H-NMR diffusion-ordered NMR spectroscopy (DOSY) spectra display unusual diffusivities. However, the magnitude of both phenomena for mixtures of propylammonium nitrate is smaller than those observed for ethylammonium nitrate mixtures with the same cosolvent, suggesting that the cation alkyl tail plays an important role in these observations. The experimental X-ray scattering data are compared with the results of molecular dynamics simulations, including both ab initio studies used to interpret short-range interactions and classical simulations to describe longer range interactions. The higher level calculations highlight the presence of a strong hydrogen bond network within the ionic liquid, only slightly perturbed even at high acetonitrile concentration. These strong interactions lead to the symmetry breaking of the NO3- vibrations, with a splitting of about 88 cm-1 in the ν3 antisymmetric stretch. The classical force field simulations use a greater number of ion pairs, but are not capable of fully describing the longest range interactions, although they do successfully account for the observed concentration trend, and the analysis of the models confirms the nano-inhomogeneity of these kinds of samples.
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Affiliation(s)
- Marco Campetella
- Institut de Recherche de Chimie Paris, CNRS, PSL Research University, Chimie ParisTech, F-75005 Paris, France
| | - Alessandro Mariani
- Beamline ID02, ESRF-European Synchrotron Radiation Facility, 71 Avenue des Martyrs, F-38000 Grenoble, France
| | - Claudia Sadun
- Università degli Studi di Roma "La Sapienza," P. le Aldo Moro 5, I-00185 Roma, Italy
| | - Boning Wu
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854, USA
| | - Edward W Castner
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854, USA
| | - Lorenzo Gontrani
- Università degli Studi di Roma "La Sapienza," P. le Aldo Moro 5, I-00185 Roma, Italy
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Campetella M, Le Donne A, Daniele M, Gontrani L, Lupi S, Bodo E, Leonelli F. Hydrogen Bonding Features in Cholinium-Based Protic Ionic Liquids from Molecular Dynamics Simulations. J Phys Chem B 2018; 122:2635-2645. [DOI: 10.1021/acs.jpcb.7b12455] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Marco Campetella
- Chemistry Department, University of Rome “La Sapienza”, Rome, Italy
| | - Andrea Le Donne
- Chemistry Department, University of Rome “La Sapienza”, Rome, Italy
| | | | - Lorenzo Gontrani
- Chemistry Department, University of Rome “La Sapienza”, Rome, Italy
| | - Stefano Lupi
- CNR-IOM and Department of Physics, University of Rome “La Sapienza”, Rome, Italy
| | - Enrico Bodo
- Chemistry Department, University of Rome “La Sapienza”, Rome, Italy
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12
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A structural and theoretical study of the alkylammonium nitrates forefather: Liquid methylammonium nitrate. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.07.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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13
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Salma U, Plechkova NV, Caminiti R, Gontrani L. The Opposite Effect of Water and N-Methyl-2-Pyrrolidone Cosolvents on the Nanostructural Organization of Ethylammonium Butanoate Ionic Liquid: A Small- and Wide-Angle X-Ray Scattering and Molecular Dynamics Simulations Study. J Phys Chem B 2017; 121:6399-6407. [DOI: 10.1021/acs.jpcb.7b01837] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Natalia V. Plechkova
- The
QUILL Research Centre, School of Chemistry and Chemical Engineering, the Queen’s University of Belfast, Stranmillis Road, Belfast BT9 5AG, United Kingdom
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14
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Campetella M, Macchiagodena M, Gontrani L, Kirchner B. Effect of alkyl chain length in protic ionic liquids: an AIMD perspective. Mol Phys 2017. [DOI: 10.1080/00268976.2017.1308027] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- M. Campetella
- Dipartimento di Chimica, Sapienza Università di Roma, Piazzale Aldo Moro, Rome, Italy
| | - M. Macchiagodena
- Mulliken Center for Theoretical Chemistry, Institut für Physikalische und Theoretische Chemie, Universität Bonn, Beringstraße, Bonn,Germany
| | - L. Gontrani
- Dipartimento di Chimica, Sapienza Università di Roma, Piazzale Aldo Moro, Rome, Italy
| | - B. Kirchner
- Mulliken Center for Theoretical Chemistry, Institut für Physikalische und Theoretische Chemie, Universität Bonn, Beringstraße, Bonn,Germany
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15
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Liu H, Paddison SJ. Alkyl Chain Length Dependence of Backbone-to-Backbone Distance in Polymerized Ionic Liquids: An Atomistic Simulation Perspective on Scattering. Macromolecules 2017. [DOI: 10.1021/acs.macromol.6b02708] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Hongjun Liu
- Department of Chemical and
Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Stephen J. Paddison
- Department of Chemical and
Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
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16
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Tang X, Zhang J, Liu L, Yang D, Wang H, He F. Synthesis of 13-substituted derivatives of berberine: Aggregation-induced emission enhancement and pH sensitive property. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.01.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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17
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Gontrani L, Scarpellini E, Caminiti R, Campetella M. Bio ionic liquids and water mixtures: a structural study. RSC Adv 2017. [DOI: 10.1039/c6ra28545g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this study we have explored, by means of ab initio molecular dynamics, a subset of three different water/cho+–phe− mixtures.
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Affiliation(s)
- Lorenzo Gontrani
- Department of Chemistry
- “La Sapienza” University of Rome
- 00185 Rome
- Italy
| | | | - Ruggero Caminiti
- Department of Chemistry
- “La Sapienza” University of Rome
- 00185 Rome
- Italy
| | - Marco Campetella
- Department of Chemistry
- “La Sapienza” University of Rome
- 00185 Rome
- Italy
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18
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A joint experimental and computational study on ethylammonium nitrate-ethylene glycol 1:1 mixture. Structural, kinetic, dynamic and spectroscopic properties. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2016.08.043] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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19
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Salma U, Usula M, Caminiti R, Gontrani L, Plechkova NV, Seddon KR. X-ray and molecular dynamics studies of butylammonium butanoate–water binary mixtures. Phys Chem Chem Phys 2017; 19:1975-1981. [DOI: 10.1039/c6cp06860j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The nanostructural organisation of mixtures of the ionic liquid (butylammonium butanoate) and water at several mole fractions of water has been investigated using small and wide angle X-ray scattering (S-WAXS) and molecular dynamics (MD) simulations.
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Affiliation(s)
- Umme Salma
- Dipartimento di Chimica
- Università di Roma
- I-00185 Roma
- Italy
| | - Marianna Usula
- Dipartimento di Scienze Chimiche e Geologiche – Università degli Studi di Cagliari
- Cittadella Universitaria di Monserrato
- I-09042 Monserrato
- Italy
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20
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Campetella M, Bovi D, Caminiti R, Guidoni L, Bencivenni L, Gontrani L. Structural and vibrational study of 2-MethoxyEthylAmmonium Nitrate (2-OMeEAN): Interpretation of experimental results with ab initio molecular dynamics. J Chem Phys 2016; 145:024507. [DOI: 10.1063/1.4956459] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- M. Campetella
- Dipartimento di Chimica, Università di Roma, “La Sapienza,” P. le Aldo Moro 5, I-00185 Roma, Italy
| | - D. Bovi
- Dipartimento di Fisica, Università di Roma, “La Sapienza,” P. le Aldo Moro 5, I-00185 Roma, Italy
| | - R. Caminiti
- Dipartimento di Chimica, Università di Roma, “La Sapienza,” P. le Aldo Moro 5, I-00185 Roma, Italy
| | - L. Guidoni
- Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell’Aquila, Via Vetoio, Coppito, I-67100 L’Aquila, Italy
| | - L. Bencivenni
- Dipartimento di Chimica, Università di Roma, “La Sapienza,” P. le Aldo Moro 5, I-00185 Roma, Italy
| | - L. Gontrani
- Dipartimento di Chimica, Università di Roma, “La Sapienza,” P. le Aldo Moro 5, I-00185 Roma, Italy
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21
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Campetella M, Bencivenni L, Caminiti R, Zazza C, Di Trapani S, Martino A, Gontrani L. Chloromethyl-oxirane and chloromethyl-thiirane in liquid phase: A joint experimental and quantum chemical study. Chem Phys 2016. [DOI: 10.1016/j.chemphys.2016.03.027] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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22
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Liu H, Paddison SJ. Direct Comparison of Atomistic Molecular Dynamics Simulations and X-ray Scattering of Polymerized Ionic Liquids. ACS Macro Lett 2016; 5:537-543. [PMID: 35607231 DOI: 10.1021/acsmacrolett.6b00061] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The design of solid-state electrolytes for electrochemical applications that utilize polymerized ionic liquids (polyILs) would greatly benefit from a molecular-level understanding of structure-function relationships. We herein use atomistic molecular dynamics simulations to investigate the structural properties of a homologous series of poly(n-alkyl-vinylimidzolium bistrifluoromethylsulfonylimide) poly(nVim Tf2N) and present the first direct comparison of the structure factors obtained from X-ray scattering and simulations. Excellent agreement is found in terms of peak position and shape. The backbone-to-backbone correlation length increases at a rate of 1 Å/CH2. The longer alkyl chains lead to the longer backbone-to-backbone separation and the larger nonpolar nanodomains. This quantitative comparison of atomistic simulations to X-ray scattering will lead to a fundamental understanding in structure and morphology of polyILs and pave a path forward toward the rational design of future polyILs for electrochemical devices.
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Affiliation(s)
- Hongjun Liu
- Department of Chemical and
Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Stephen J. Paddison
- Department of Chemical and
Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
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23
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Liu H, Paddison SJ. Direct calculation of the X-ray structure factor of ionic liquids. Phys Chem Chem Phys 2016; 18:11000-7. [DOI: 10.1039/c5cp06199g] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A conceptually simple and computationally efficient direct method to calculate the total X-ray structure factor of ionic liquids from molecular simulations is advocated to be complementary to the popular Fourier transform (FT) method.
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Affiliation(s)
- Hongjun Liu
- Department of Chemical & Biomolecular Engineering
- University of Tennessee
- Knoxville
- USA
| | - Stephen J. Paddison
- Department of Chemical & Biomolecular Engineering
- University of Tennessee
- Knoxville
- USA
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24
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Affiliation(s)
- Robert Hayes
- Discipline
of Chemistry, The University of Newcastle, NSW 2308, Callaghan, Australia
| | - Gregory G. Warr
- School
of Chemistry, The University of Sydney, NSW 2006, Sydney, Australia
| | - Rob Atkin
- Discipline
of Chemistry, The University of Newcastle, NSW 2308, Callaghan, Australia
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25
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Campetella M, De Santis S, Caminiti R, Ballirano P, Sadun C, Tanzi L, Gontrani L. Is a medium-range order pre-peak possible for ionic liquids without an aliphatic chain? RSC Adv 2015. [DOI: 10.1039/c5ra07567j] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The pre-peak in the X-ray scattering patterns of ionic liquids is not always due to alkyl chains. In choline–proline (a bio-compatible ionic liquid), it is due to second-shell cation–cation distances.
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Affiliation(s)
- Marco Campetella
- Department of Chemistry
- University of Rome “La Sapienza”
- Roma
- Italy
| | - Serena De Santis
- Department of Chemistry
- University of Rome “La Sapienza”
- Roma
- Italy
| | - Ruggero Caminiti
- Department of Chemistry
- University of Rome “La Sapienza”
- Roma
- Italy
| | - Paolo Ballirano
- Department of Earth Sciences
- University of Rome “La Sapienza”
- Roma
- Italy
| | - Claudia Sadun
- Department of Chemistry
- University of Rome “La Sapienza”
- Roma
- Italy
| | - Luana Tanzi
- Department of Physical and Chemical Sciences
- University of L’Aquila
- 67100 Coppito
- Italy
| | - Lorenzo Gontrani
- Department of Chemistry
- University of Rome “La Sapienza”
- Roma
- Italy
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26
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De Santis S, Masci G, Casciotta F, Caminiti R, Scarpellini E, Campetella M, Gontrani L. Cholinium-amino acid based ionic liquids: a new method of synthesis and physico-chemical characterization. Phys Chem Chem Phys 2015. [DOI: 10.1039/c5cp01612f] [Citation(s) in RCA: 115] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Fourteen cholinium-amino acid based room temperature ionic liquids were prepared using a cleaner synthetic method. Chemicophysical properties were well correlated with the wide range of amino acid chemical structures.
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Affiliation(s)
- Serena De Santis
- Sapienza University of Rome
- Department of Chemistry
- I-00185 Rome
- Italy
| | - Giancarlo Masci
- Sapienza University of Rome
- Department of Chemistry
- I-00185 Rome
- Italy
| | | | - Ruggero Caminiti
- Sapienza University of Rome
- Department of Chemistry
- I-00185 Rome
- Italy
| | | | - Marco Campetella
- Sapienza University of Rome
- Department of Chemistry
- I-00185 Rome
- Italy
| | - Lorenzo Gontrani
- Sapienza University of Rome
- Department of Chemistry
- I-00185 Rome
- Italy
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27
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Campetella M, Gontrani L, Leonelli F, Bencivenni L, Caminiti R. Two Different Models to Predict Ionic-Liquid Diffraction Patterns: Fixed-Charge versus Polarizable Potentials. Chemphyschem 2014; 16:197-203. [DOI: 10.1002/cphc.201402577] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Revised: 09/10/2014] [Indexed: 11/09/2022]
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