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Befort BJ, DeFever RS, Tow GM, Dowling AW, Maginn EJ. Machine Learning Directed Optimization of Classical Molecular Modeling Force Fields. J Chem Inf Model 2021; 61:4400-4414. [PMID: 34402301 DOI: 10.1021/acs.jcim.1c00448] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Accurate force fields are necessary for predictive molecular simulations. However, developing force fields that accurately reproduce experimental properties is challenging. Here, we present a machine learning directed, multiobjective optimization workflow for force field parametrization that evaluates millions of prospective force field parameter sets while requiring only a small fraction of them to be tested with molecular simulations. We demonstrate the generality of the approach and identify multiple low-error parameter sets for two distinct test cases: simulations of hydrofluorocarbon (HFC) vapor-liquid equilibrium (VLE) and an ammonium perchlorate (AP) crystal phase. We discuss the challenges and implications of our force field optimization workflow.
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Affiliation(s)
- Bridgette J Befort
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Ryan S DeFever
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Garrett M Tow
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Alexander W Dowling
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Edward J Maginn
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
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2
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Reinholdt P, Wind S, Wüstner D, Kongsted J. Computational Characterization of a Cholesterol-Based Molecular Rotor in Lipid Membranes. J Phys Chem B 2019; 123:7313-7326. [PMID: 31381343 DOI: 10.1021/acs.jpcb.9b04967] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Biophysical properties of cellular membranes critically depend on their content of cholesterol and its interaction with various other lipid species. Cholesterol-dependent friction at the nanoscale can be studied with molecular rotors, whose quantum yield depends on rotational dynamics of functional groups during their excited state lifetime. Here, we present a detailed computational analysis of a phenyl-BODIPY-linked cholesterol based molecular rotor in direct comparison with the well-known TopFluor-cholesterol. We describe a new parametrization strategy of force field parameters for the BODIPY moiety and carry out extensive molecular dynamics simulations of the probe in membranes in the absence or presence of cholesterol. Our study quantifies the extent of membrane perturbation by these probes, analyzes their tilting resistance in the bilayer and derives dynamic properties directly related to the rotor propensity. We show that phenyl-BODIPY-cholesterol bears potential as a cholesterol-dependent molecular rotor to report about microviscosity of sterol-containing model and cell membranes.
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Affiliation(s)
- Peter Reinholdt
- Department of Physics, Chemistry and Pharmacy , University of Southern Denmark , Campusvej 55 , DK-5230 Odense M , Denmark
| | - Signe Wind
- Department of Physics, Chemistry and Pharmacy , University of Southern Denmark , Campusvej 55 , DK-5230 Odense M , Denmark
| | - Daniel Wüstner
- Department of Biochemistry and Molecular Biology , University of Southern Denmark , Campusvej 55 , DK-5230 Odense M , Denmark
| | - Jacob Kongsted
- Department of Physics, Chemistry and Pharmacy , University of Southern Denmark , Campusvej 55 , DK-5230 Odense M , Denmark
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3
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Tong J, Guo Y, Huo F, Xie X, He H, von Solms N, Liang X, Zhang S. Developing a Coarse-Grained Model for 1-Alkyl-3-methyl-imidazolium Chloride Ionic Liquids. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b03665] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jiahuan Tong
- Department of Chemical & Biochemical Engineering, Technical University of Denmark, DK 2800 Kgs., Lyngby, Denmark
- Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China
- College of Mathematics and Physics, Bohai University, Jinzhou 121013, P. R. China
| | - Yandong Guo
- College of Mathematics and Physics, Bohai University, Jinzhou 121013, P. R. China
| | - Feng Huo
- Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Xiaodong Xie
- Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China
- College of Mathematics and Physics, Bohai University, Jinzhou 121013, P. R. China
| | - Hongyan He
- Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Nicolas von Solms
- Department of Chemical & Biochemical Engineering, Technical University of Denmark, DK 2800 Kgs., Lyngby, Denmark
| | - Xiaodong Liang
- Department of Chemical & Biochemical Engineering, Technical University of Denmark, DK 2800 Kgs., Lyngby, Denmark
| | - Suojiang Zhang
- Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China
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4
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Fogarty R, Rowe R, Matthews RP, Clough MT, Ashworth CR, Brandt A, Corbett PJ, Palgrave RG, Smith EF, Bourne RA, Chamberlain TW, Thompson PBJ, Hunt PA, Lovelock KRJ. Atomic charges of sulfur in ionic liquids: experiments and calculations. Faraday Discuss 2018; 206:183-201. [DOI: 10.1039/c7fd00155j] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A wide variety of experimental and computational methods are used to probe sulfur atomic charges in ionic liquids.
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Affiliation(s)
| | - Rebecca Rowe
- Department of Chemistry
- Imperial College London
- UK
| | | | | | | | | | | | | | | | - Richard A. Bourne
- School of Chemical and Process Engineering
- University of Leeds
- UK
- Institute of Process Research and Development
- School of Chemistry
| | - Thomas W. Chamberlain
- Institute of Process Research and Development
- School of Chemistry
- University of Leeds
- UK
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5
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Hernández-Ríos S, Sánchez-Badillo J, Gallo M, López-Albarran P, Gaspar-Armenta J, González-García R. Thermodynamic properties of the 1-butyl-3-methylimidazolium mesilate ionic liquid [C4mim][OMs] in condensed phase, using molecular simulations. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.09.031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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6
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Izgorodina EI, Seeger ZL, Scarborough DLA, Tan SYS. Quantum Chemical Methods for the Prediction of Energetic, Physical, and Spectroscopic Properties of Ionic Liquids. Chem Rev 2017; 117:6696-6754. [PMID: 28139908 DOI: 10.1021/acs.chemrev.6b00528] [Citation(s) in RCA: 125] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The accurate prediction of physicochemical properties of condensed systems is a longstanding goal of theoretical (quantum) chemistry. Ionic liquids comprising entirely of ions provide a unique challenge in this respect due to the diverse chemical nature of available ions and the complex interplay of intermolecular interactions among them, thus resulting in the wide variability of physicochemical properties, such as thermodynamic, transport, and spectroscopic properties. It is well understood that intermolecular forces are directly linked to physicochemical properties of condensed systems, and therefore, an understanding of this relationship would greatly aid in the design and synthesis of functionalized materials with tailored properties for an application at hand. This review aims to give an overview of how electronic structure properties obtained from quantum chemical methods such as interaction/binding energy and its fundamental components, dipole moment, polarizability, and orbital energies, can help shed light on the energetic, physical, and spectroscopic properties of semi-Coulomb systems such as ionic liquids. Particular emphasis is given to the prediction of their thermodynamic, transport, spectroscopic, and solubilizing properties.
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Affiliation(s)
- Ekaterina I Izgorodina
- Monash Computational Chemistry Group, School of Chemistry, Monash University , 17 Rainforest Walk, Clayton, Victoria 3800, Australia
| | - Zoe L Seeger
- Monash Computational Chemistry Group, School of Chemistry, Monash University , 17 Rainforest Walk, Clayton, Victoria 3800, Australia
| | - David L A Scarborough
- Monash Computational Chemistry Group, School of Chemistry, Monash University , 17 Rainforest Walk, Clayton, Victoria 3800, Australia
| | - Samuel Y S Tan
- Monash Computational Chemistry Group, School of Chemistry, Monash University , 17 Rainforest Walk, Clayton, Victoria 3800, Australia
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7
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McDaniel JG, Choi E, Son CY, Schmidt JR, Yethiraj A. Ab Initio Force Fields for Imidazolium-Based Ionic Liquids. J Phys Chem B 2016; 120:7024-36. [DOI: 10.1021/acs.jpcb.6b05328] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jesse G. McDaniel
- Department of Chemistry and ‡Department of Physics, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
| | - Eunsong Choi
- Department of Chemistry and ‡Department of Physics, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
| | - Chang Yun Son
- Department of Chemistry and ‡Department of Physics, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
| | - J. R. Schmidt
- Department of Chemistry and ‡Department of Physics, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
| | - Arun Yethiraj
- Department of Chemistry and ‡Department of Physics, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
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8
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Wu Y, Hu N, Yue L, Wei L, Guan W. Effects of polarizability on the structural and thermodynamics properties of [Cnmim][Gly] ionic liquids (n = 1–4) using EEM/MM molecular dynamic simulations. J Chem Phys 2015; 142:064503. [DOI: 10.1063/1.4907281] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Yang Wu
- Key Laboratory of Green Synthesis and Preparative Chemistry of Advanced Materials, College of Chemistry, Liaoning University, Shenyang 110036, China
| | - Na Hu
- Key Laboratory of Green Synthesis and Preparative Chemistry of Advanced Materials, College of Chemistry, Liaoning University, Shenyang 110036, China
| | - Lili Yue
- Key Laboratory of Green Synthesis and Preparative Chemistry of Advanced Materials, College of Chemistry, Liaoning University, Shenyang 110036, China
| | - Lihong Wei
- Key Laboratory of Green Synthesis and Preparative Chemistry of Advanced Materials, College of Chemistry, Liaoning University, Shenyang 110036, China
| | - Wei Guan
- Key Laboratory of Green Synthesis and Preparative Chemistry of Advanced Materials, College of Chemistry, Liaoning University, Shenyang 110036, China
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9
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Do H, Troisi A. Developing accurate molecular mechanics force fields for conjugated molecular systems. Phys Chem Chem Phys 2015; 17:25123-32. [DOI: 10.1039/c5cp04328j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A rapid method to parameterize the intramolecular component of classical force fields is proposed and applied to a molecular semiconductor, oligomers of conjugated polymers and a biological chromophore.
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Affiliation(s)
- Hainam Do
- Department of Chemistry and Centre for Scientific Computing
- University of Warwick
- Coventry CV4 7AL
- UK
| | - Alessandro Troisi
- Department of Chemistry and Centre for Scientific Computing
- University of Warwick
- Coventry CV4 7AL
- UK
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10
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Keaveney ST, Harper JB, Croft AK. Computational approaches to understanding reaction outcomes of organic processes in ionic liquids. RSC Adv 2015. [DOI: 10.1039/c4ra14676j] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The utility of using a combined experimental and computational approach for understanding ionic liquid media, and their effect on reaction outcome, is highlighted through a number of case studies.
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Affiliation(s)
| | - Jason B. Harper
- School of Chemistry
- University of New South Wales
- Sydney
- Australia
| | - Anna K. Croft
- Department of Chemical and Environmental Engineering
- University of Nottingham
- University Park
- Nottingham
- UK
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11
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Salanne M. Simulations of room temperature ionic liquids: from polarizable to coarse-grained force fields. Phys Chem Chem Phys 2015; 17:14270-9. [DOI: 10.1039/c4cp05550k] [Citation(s) in RCA: 132] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
This perspective article summarizes the recent advances in the classical molecular modelling of room temperature ionic liquids.
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Affiliation(s)
- Mathieu Salanne
- Sorbonne Universités
- UPMC Univ Paris 06
- UMR 8234
- PHENIX
- F-75005 Paris
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12
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Koskelo J, Juurinen I, Ruotsalainen KO, McGrath MJ, Kuo IF, Lehtola S, Galambosi S, Hämäläinen K, Huotari S, Hakala M. Intra- and intermolecular effects on the Compton profile of the ionic liquid 1,3-dimethylimidazolium chloride. J Chem Phys 2014; 141:244505. [PMID: 25554165 DOI: 10.1063/1.4904278] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present a comprehensive simulation study on the solid-liquid phase transition of the ionic liquid 1,3-dimethylimidazolium chloride in terms of the changes in the atomic structure and their effect on the Compton profile. The structures were obtained by using ab initio molecular dynamics simulations. Chosen radial distribution functions of the liquid structure are presented and found generally to be in good agreement with previous ab initio molecular dynamics and neutron scattering studies. The main contributions to the predicted difference Compton profile are found to arise from intermolecular changes in the phase transition. This prediction can be used for interpreting future experiments.
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Affiliation(s)
- J Koskelo
- Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
| | - I Juurinen
- Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
| | - K O Ruotsalainen
- Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
| | - M J McGrath
- Laboratoire des Sciences du Climat et de l'Environnement, CEA-Orme des Merisiers, F-91191 Gif-sur-Yvette CEDEX, France
| | - I-F Kuo
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S Lehtola
- Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
| | - S Galambosi
- Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
| | - K Hämäläinen
- Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
| | - S Huotari
- Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
| | - M Hakala
- Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
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13
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Wu Y, Li Y, Hu N, Hong M. The electronegativity equalization method fused with molecular mechanics: a fluctuating charge and flexible body potential function for [Emim][Gly] ionic liquids. Phys Chem Chem Phys 2014; 16:2674-85. [PMID: 24382460 DOI: 10.1039/c3cp54111h] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Recently, experimental and theoretical studies on amino acid ionic liquid (AAIL) systems have attracted much attention. A transferable intermolecular potential approach that includes fluctuating charges and a flexible body based on a combination of the electronegativity equalization method and molecular mechanics (EEM/MM), and its application to an AAIL system containing 1-ethyl-3-methylimidazolium ([Emim](+)) and glycine ([Gly](-)) are explored and tested in this study. A consistent integration of EEM with MM requires the input of the EEM charges of all atoms into the MM intermolecular electrostatic interaction term. Compared with ionic liquid (IL) force fields, the EEM/MM model has an outstanding feature: the EEM/MM model not only presents the electrostatic interaction of atoms and their changes in response to different ambient environments but also introduces "the H-bond interaction region" in which a new parameter kHB(RHB) is used to describe the electrostatic interaction of hydrogen atoms in [Emim](+) and oxygen atoms in [Gly](-), which can form hydrogen bonds. The EEM/MM model gives quite accurate predictions for gas-phase state properties of [Emim](+), [Gly](-), and ion pairs, such as optimized geometries, dipole moments, vibrational frequencies, and cluster interaction energies. Due to its explicit description of charges and hydrogen bonds, the EEM/MM model also performs well for the liquid-phase properties of [Emim][Gly] under ambient conditions. The calculated properties, such as density, heat of vaporization, the self-diffusion coefficient, and ionic conductivity, are fairly consistent with available experimental results.
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Affiliation(s)
- Yang Wu
- College of Chemistry, Key Laboratory of Green Synthesis and Preparative Chemistry of Advanced Materials, Liaoning University, Shenyang 110036, China.
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14
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Wang LP, Chen J, Van Voorhis T. Systematic Parametrization of Polarizable Force Fields from Quantum Chemistry Data. J Chem Theory Comput 2012; 9:452-60. [PMID: 26589047 DOI: 10.1021/ct300826t] [Citation(s) in RCA: 139] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We introduce ForceBalance, a method and free software package for systematic force field optimization with the ability to parametrize a wide variety of functional forms using flexible combinations of reference data. We outline several important challenges in force field development and how they are addressed in ForceBalance, and present an example calculation where these methods are applied to develop a highly accurate polarizable water model. ForceBalance is available for free download at https://simtk.org/home/forcebalance.
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Affiliation(s)
- Lee-Ping Wang
- Department of Chemistry, Stanford University, 318 Campus Drive, Stanford, California 94350, United States
| | - Jiahao Chen
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Troy Van Voorhis
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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15
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Zhang Y, Maginn EJ. A simple AIMD approach to derive atomic charges for condensed phase simulation of ionic liquids. J Phys Chem B 2012; 116:10036-48. [PMID: 22852554 DOI: 10.1021/jp3037999] [Citation(s) in RCA: 145] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The atomic charges for two ionic liquids (ILs), 1-n-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]) and 1-ethyl-3-methylimidazolium hexafluorophosphate ([EMIM][PF6]), were derived from periodic crystal phase calculations with density functional theory (DFT) and plane wave basis sets (denoted as "AIMD-c charge"). For both ILs, the total charge was found to be ±0.8 e for the cation and anion, respectively, due to the charge transfer between ions and polarization caused by the environment. These atomic charges were used in a force field developed within the general Amber force field framework. Using this force field, static, dynamic, and thermodynamic properties were computed for the two ILs using molecular dynamics simulation. The results were compared against results obtained using the same Amber force field but four different sets of partial charges, denoted as full charge, scaled charge, AIMD-l charge, and AIMD-b charge, respectively. The full charge was derived from quantum chemistry calculation of isolated ions in a vacuum and resulted in a total charge of unity on each ion. The scaled charge was obtained by uniformly scaling the full charge by 0.8. AIMD-l and AIMD-b charges were derived from liquid phase ab initio molecular dynamics simulations. The scaled charges have the same total charge on the ions as the AIMD-c charge but different distributions. It was found that simulation results not only depend on the total charge of each ion, but they are also sensitive to the charge distribution within an ion, especially for dynamic and thermodynamic properties. Overall, for the two ILs under study, the AIMD-c charge was found to predict experimental results better than the other four sets of charges, indicating that fitting charges from crystal phase DFT calculations, instead of extensive sampling of the liquid phase configurations, is a simple and reliable way to derive atomic charges for condensed phase ionic liquid simulations.
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Affiliation(s)
- Yong Zhang
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA
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16
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Liu X, Zhao Y, Zhang X, Zhou G, Zhang S. Microstructures and Interaction Analyses of Phosphonium-Based Ionic Liquids: A Simulation Study. J Phys Chem B 2012; 116:4934-42. [DOI: 10.1021/jp210696r] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Xiaomin Liu
- State Key Laboratory of Multiphase
Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China
| | - Yuling Zhao
- State Key Laboratory of Multiphase
Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China
- Key Laboratory of Green Chemical
Media and Reactions, Ministry of Education, School of Chemistry and
Environmental Science, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xiaochun Zhang
- State Key Laboratory of Multiphase
Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China
| | - Guohui Zhou
- Beijing Salien Company, Beijing, 100083,
China
| | - Suojiang Zhang
- State Key Laboratory of Multiphase
Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China
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17
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Dommert F, Wendler K, Berger R, Delle Site L, Holm C. Force Fields for Studying the Structure and Dynamics of Ionic Liquids: A Critical Review of Recent Developments. Chemphyschem 2012; 13:1625-37. [DOI: 10.1002/cphc.201100997] [Citation(s) in RCA: 226] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2011] [Indexed: 11/06/2022]
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18
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Kohanoff J, Pinilla C, Youngs TGA, Artacho E, Soler JM. Dispersion interactions in room-temperature ionic liquids: results from a non-empirical density functional. J Chem Phys 2012; 135:154505. [PMID: 22029322 DOI: 10.1063/1.3652897] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The role of dispersion or van de Waals (VDW) interactions in imidazolium-based room-temperature ionic liquids is studied within the framework of density functional theory, using a recently developed non-empirical functional [M. Dion, H. Rydberg, E. Schröder, D. C. Langreth, and B. I. Lundqvist, Phys. Rev. Lett. 92, 246401 (2004)], as efficiently implemented in the SIESTA code [G. Román-Pérez and J. M. Soler, Phys. Rev. Lett. 103, 096102 (2009)]. We present results for the equilibrium structure and lattice parameters of several crystalline phases, finding a general improvement with respect to both the local density (LDA) and the generalized gradient approximations (GGA). Similar to other systems characterized by VDW bonding, such as rare gas and benzene dimers as well as solid argon, equilibrium distances and volumes are consistently overestimated by ≈7%, compared to -11% within LDA and 11% within GGA. The intramolecular geometries are retained, while the intermolecular distances and orientations are significantly improved relative to LDA and GGA. The quality is superior to that achieved with tailor-made empirical VDW corrections ad hoc [M. G. Del Pópolo, C. Pinilla, and P. Ballone, J. Chem. Phys. 126, 144705 (2007)]. We also analyse the performance of an optimized version of this non-empirical functional, where the screening properties of the exchange have been tuned to reproduce high-level quantum chemical calculations [J. Klimes, D. Bowler, and A. Michaelides, J. Phys.: Condens. Matter 22, 074203 (2010)]. The results for solids are even better with volumes and geometries reproduced within 2% of experimental data. We provide some insight into the issue of polymorphism of [bmim][Cl] crystals, and we present results for the geometry and energetics of [bmim][Tf] and [mmim][Cl] neutral and charged clusters, which validate the use of empirical force fields.
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Affiliation(s)
- Jorge Kohanoff
- Atomistic Simulation Centre, Queen's University Belfast, Belfast BT7 1NN, Northern IrelandSchool of Chemistry, University of Bristol, Bristol BS2 1TS, United Kingdom.
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19
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Sala J, Guàrdia E, Martí J, Spångberg D, Masia M. Fitting properties from density functional theory based molecular dynamics simulations to parameterize a rigid water force field. J Chem Phys 2012; 136:054103. [DOI: 10.1063/1.3679402] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
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20
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Salanne M, Siqueira LJA, Seitsonen AP, Madden PA, Kirchner B. From molten salts to room temperature ionic liquids: Simulation studies on chloroaluminate systems. Faraday Discuss 2012; 154:171-88; discussion 189-220, 465-71. [DOI: 10.1039/c1fd00053e] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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21
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Liu H, Maginn E. A molecular dynamics investigation of the structural and dynamic properties of the ionic liquid 1-n-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide. J Chem Phys 2011; 135:124507. [DOI: 10.1063/1.3643124] [Citation(s) in RCA: 151] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
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22
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Wang LP, Van Voorhis T. Communication: Hybrid ensembles for improved force matching. J Chem Phys 2011; 133:231101. [PMID: 21186847 DOI: 10.1063/1.3519043] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Force matching is a method for parameterizing empirical potentials in which the empirical parameters are fitted to a reference potential energy surface (PES). Typically, training data are sampled from a canonical ensemble generated with either the empirical potential or the reference PES. In this Communication, we show that sampling from either ensemble risks excluding critical regions of configuration space, leading to fitted potentials that deviate significantly from the reference PES. We present a hybrid ensemble which combines the Boltzmann probabilities of both potential surfaces into the fitting procedure, and we demonstrate that this technique improves the quality and stability of empirical potentials.
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Affiliation(s)
- Lee-Ping Wang
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139, USA
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Izgorodina EI. Towards large-scale, fully ab initio calculations of ionic liquids. Phys Chem Chem Phys 2011; 13:4189-207. [PMID: 21283896 DOI: 10.1039/c0cp02315a] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Ionic liquids have attracted a substantial amount of interest as replacement of traditional electrolytes in high efficiency electrochemical devices for generation and storage of energy due to their superior physical and chemical properties, especially low volatility and high electrochemical stability. For enhanced performance of the electrochemical devices ionic liquids are required to be highly conductive and low viscous. Long-range Coulomb and short-range dispersion interactions between ions affect physical and chemical properties of ionic liquids in a very complex way, thus preventing direct correlations to the chemical structure. Considering a vast combination of available cations and anions that can be used to synthesize ionic liquids, development of predictive theoretical approaches that allow for accurate tailoring of their physical properties has become crucial to further enhance the performance of electrochemical devices such as lithium batteries, fuel and solar cells. This perspective article gives a thorough overview of current theoretical approaches applied for studying thermodynamic (melting point and enthalpy of vapourisation) and transport (conductivity and viscosity) properties of ionic liquids, emphasizing their reliability and limitations. Strategies for improving predictive power and versatility of existing theoretical approaches are also outlined.
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Schröder C, Sonnleitner T, Buchner R, Steinhauser O. The influence of polarizability on the dielectric spectrum of the ionic liquid 1-ethyl-3-methylimidazolium triflate. Phys Chem Chem Phys 2011; 13:12240-8. [DOI: 10.1039/c1cp20559e] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Schröder C, Steinhauser O. Simulating polarizable molecular ionic liquids with Drude oscillators. J Chem Phys 2010; 133:154511. [PMID: 20969407 PMCID: PMC7613784 DOI: 10.1063/1.3493689] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The Drude oscillator model is applied to the molecular ionic liquid 1-ethyl-3-methyl-imidazolium triflate. The range of manageable Drude charges is tested. The strength of the polarizability is systematically varied from 0% to 100%. The influence on the structure, single particle dynamics, and collective dielectric properties is investigated. The generalized dielectric constant can be decomposed into a dielectric permittivity, a dielectric conductivity, and an optical dielectric constant ɛ(∞). The major part of the static generalized dielectric constant comes from the collective rotation of the ions, i.e., the dielectric permittivity. The translational contribution from the dielectric conductivity is about 58% of the dielectric permittivity. For the evaluation of the optical dielectric contribution, the computational dielectric theory was adapted to the case of heterogeneous polarizabilities. In case of 100% polarizability, it reaches a value of approximately 2.
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Affiliation(s)
- Christian Schröder
- Department of Computational Biological Chemistry, University of Vienna, Währingerstrasse 17, A-1090 Vienna, Austria
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Yan T, Wang Y, Knox C. On the Structure of Ionic Liquids: Comparisons between Electronically Polarizable and Nonpolarizable Models I. J Phys Chem B 2010; 114:6905-21. [DOI: 10.1021/jp9089112] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Tianying Yan
- Institute of New Energy Material Chemistry and Department of Material Chemistry, Nankai University, Tianjin 300071, China, Key Laboratory of Frontiers in Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, 55 East Zhongguancun Road, Beijing, 100190, China, and Center for Biophysical Modeling and Simulation and Department of Chemistry, University of Utah, Salt Lake City, Utah 84112-0850
| | - Yanting Wang
- Institute of New Energy Material Chemistry and Department of Material Chemistry, Nankai University, Tianjin 300071, China, Key Laboratory of Frontiers in Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, 55 East Zhongguancun Road, Beijing, 100190, China, and Center for Biophysical Modeling and Simulation and Department of Chemistry, University of Utah, Salt Lake City, Utah 84112-0850
| | - Craig Knox
- Institute of New Energy Material Chemistry and Department of Material Chemistry, Nankai University, Tianjin 300071, China, Key Laboratory of Frontiers in Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, 55 East Zhongguancun Road, Beijing, 100190, China, and Center for Biophysical Modeling and Simulation and Department of Chemistry, University of Utah, Salt Lake City, Utah 84112-0850
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27
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Nakano H, Yamamoto T, Kato S. A wave-function based approach for polarizable charge model: Systematic comparison of polarization effects on protic, aprotic, and ionic liquids. J Chem Phys 2010; 132:044106. [PMID: 20113018 DOI: 10.1063/1.3298873] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
We first describe a wave-function based formalism of polarizable charge model by starting from the Hartree product ansatz for the total wave function and making the second-order expansion of individual molecular energies with the use of partial charge operators. The resulting model is shown to be formally equivalent to the charge response kernel model that starts from the linear-response approximation to partial charges, and also closely related to a family of fluctuating charge models that are based on the electronegativity equalization principle. We then apply the above model to a systematic comparison of polarization effects on qualitatively different liquids, namely, protic solvents (water and methanol), an aprotic polar solvent (acetonitrile), and imidazolium-based ionic liquids. Electronic polarization is known to decelerate molecular motions in conventional solvents while it accelerates them in ionic liquids. To obtain more insights into these phenomena, we consider an effective decomposition of total polarization energy into molecular contributions, and show that their statistical distribution is well-correlated with the acceleration/deceleration of molecular motions. In addition, we perform effective nonpolarizable simulations based on mean polarized charges, and compare them with fully polarizable simulations. The result shows that the former can reproduce structural properties of conventional solvents rather accurately, while they fail qualitatively to reproduce acceleration of molecular motions in ionic liquids.
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Affiliation(s)
- Hiroshi Nakano
- Department of Chemistry, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
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28
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Liu Z, Chen T, Bell A, Smit B. Improved United-Atom Force Field for 1-Alkyl-3-methylimidazolium Chloride. J Phys Chem B 2010; 114:4572-82. [DOI: 10.1021/jp911337f] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhiping Liu
- Energy Biosciences Institute and Department of Chemical Engineering, University of California, Berkeley, Berkeley, California 94720-1462
| | - Ting Chen
- Energy Biosciences Institute and Department of Chemical Engineering, University of California, Berkeley, Berkeley, California 94720-1462
| | - Alex Bell
- Energy Biosciences Institute and Department of Chemical Engineering, University of California, Berkeley, Berkeley, California 94720-1462
| | - Berend Smit
- Energy Biosciences Institute and Department of Chemical Engineering, University of California, Berkeley, Berkeley, California 94720-1462
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Dommert F, Schmidt J, Krekeler C, Zhao YY, Berger R, Delle Site L, Holm C. Towards multiscale modeling of ionic liquids: From electronic structure to bulk properties. J Mol Liq 2010. [DOI: 10.1016/j.molliq.2009.06.014] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Lynden-Bell RM, Youngs TGA. Simulations of imidazolium ionic liquids: when does the cation charge distribution matter? JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:424120. [PMID: 21715855 DOI: 10.1088/0953-8984/21/42/424120] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We compare the properties of models of liquids and crystals constructed from a number of intermolecular potentials for dimethylimidazolium chloride [dmim][Cl]. The force fields differ in the charge distribution in the cation but all include short range interactions which determine the shape of the cation. In addition to 'realistic' models intended for simulation of [dmim][Cl] we take two extreme 'unrealistic' models in which the cation charge is localized on the ring atoms or at the ring centre in order to study the effects of the cation charge distribution. The effects of polarizability are investigated by using shell models for the chloride ion. We find that, while equilibrium properties such as energetics, crystal structure, liquid structure and charge screening depend on the charge distribution in the cation but are little affected by including polarizability, dynamical properties such as diffusion are strongly affected by polarizability.
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Affiliation(s)
- R M Lynden-Bell
- Department of Chemistry, Lensfield Road, Cambridge CB2 1EW, UK
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31
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Yau HM, Chan SJ, George SRD, Hook JM, Croft AK, Harper JB. Ionic liquids: just Molten salts after all? Molecules 2009; 14:2521-34. [PMID: 19633621 PMCID: PMC6254844 DOI: 10.3390/molecules14072521] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2009] [Revised: 07/06/2009] [Accepted: 07/10/2009] [Indexed: 11/16/2022] Open
Abstract
While there has been much effort in recent years to characterise ionic liquids in terms of parameters that are well described for molecular solvents, using these to explain reaction outcomes remains problematic. Herein we propose that many reaction outcomes in ionic liquids may be explained by considering the electrostatic interactions present in the solution; that is, by recognising that ionic liquids are salts. This is supported by evidence in the literature, along with studies presented here.
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Affiliation(s)
- Hon Man Yau
- School of Chemistry, University of New South Wales, Sydney, NSW, 2052, Australia
| | - Si Jia Chan
- School of Chemistry, University of New South Wales, Sydney, NSW, 2052, Australia
| | - Stephen R. D. George
- School of Chemistry, University of New South Wales, Sydney, NSW, 2052, Australia
| | - James M. Hook
- Analytical Centre, University of New South Wales, Sydney, NSW, 2052, Australia
| | - Anna K. Croft
- School of Chemistry, University of Wales Bangor, Bangor, Gwynedd, LL57 2UW, UK
- Authors to whom correspondence should be addressed; E-Mails: (J-B.H.); (A-K.C.)
| | - Jason B. Harper
- School of Chemistry, University of New South Wales, Sydney, NSW, 2052, Australia
- Authors to whom correspondence should be addressed; E-Mails: (J-B.H.); (A-K.C.)
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32
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Zhang X, Huo F, Liu Z, Wang W, Shi W, Maginn EJ. Absorption of CO2 in the Ionic Liquid 1-n-Hexyl-3-methylimidazolium Tris(pentafluoroethyl)trifluorophosphate ([hmim][FEP]): A Molecular View by Computer Simulations. J Phys Chem B 2009; 113:7591-8. [DOI: 10.1021/jp900403q] [Citation(s) in RCA: 115] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiaochun Zhang
- Division of Molecular and Materials Simulation, Key Lab for Nanomaterials, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China, and Department of Chemical and Biomolecular Engineering, University of Notre Dame, 182 Fitzpatrick Hall, Notre Dame, Indiana 46556-5637
| | - Feng Huo
- Division of Molecular and Materials Simulation, Key Lab for Nanomaterials, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China, and Department of Chemical and Biomolecular Engineering, University of Notre Dame, 182 Fitzpatrick Hall, Notre Dame, Indiana 46556-5637
| | - Zhiping Liu
- Division of Molecular and Materials Simulation, Key Lab for Nanomaterials, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China, and Department of Chemical and Biomolecular Engineering, University of Notre Dame, 182 Fitzpatrick Hall, Notre Dame, Indiana 46556-5637
| | - Wenchuan Wang
- Division of Molecular and Materials Simulation, Key Lab for Nanomaterials, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China, and Department of Chemical and Biomolecular Engineering, University of Notre Dame, 182 Fitzpatrick Hall, Notre Dame, Indiana 46556-5637
| | - Wei Shi
- Division of Molecular and Materials Simulation, Key Lab for Nanomaterials, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China, and Department of Chemical and Biomolecular Engineering, University of Notre Dame, 182 Fitzpatrick Hall, Notre Dame, Indiana 46556-5637
| | - Edward J. Maginn
- Division of Molecular and Materials Simulation, Key Lab for Nanomaterials, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China, and Department of Chemical and Biomolecular Engineering, University of Notre Dame, 182 Fitzpatrick Hall, Notre Dame, Indiana 46556-5637
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Malvaldi M, Bruzzone S, Chiappe C, Gusarov S, Kovalenko A. Ab Initio Study of Ionic Liquids by KS-DFT/3D-RISM-KH Theory. J Phys Chem B 2009; 113:3536-42. [DOI: 10.1021/jp810887z] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Marco Malvaldi
- Dipartimento di Bioorganica e Biofarmacia, Universitá di Pisa, Via Bonanno, Pisa, Italy, Dipartimento di Chimica e Chimica Industriale, Universitá di Pisa, Via Risorgimento 35, Pisa, Italy, Institute for Nanotechnology, National Research Council of Canada, 421 Saskatchewan Drive, Edmonton, Alberta, T6G 2M9 Canada, and Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada
| | - Samantha Bruzzone
- Dipartimento di Bioorganica e Biofarmacia, Universitá di Pisa, Via Bonanno, Pisa, Italy, Dipartimento di Chimica e Chimica Industriale, Universitá di Pisa, Via Risorgimento 35, Pisa, Italy, Institute for Nanotechnology, National Research Council of Canada, 421 Saskatchewan Drive, Edmonton, Alberta, T6G 2M9 Canada, and Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada
| | - Cinzia Chiappe
- Dipartimento di Bioorganica e Biofarmacia, Universitá di Pisa, Via Bonanno, Pisa, Italy, Dipartimento di Chimica e Chimica Industriale, Universitá di Pisa, Via Risorgimento 35, Pisa, Italy, Institute for Nanotechnology, National Research Council of Canada, 421 Saskatchewan Drive, Edmonton, Alberta, T6G 2M9 Canada, and Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada
| | - Sergey Gusarov
- Dipartimento di Bioorganica e Biofarmacia, Universitá di Pisa, Via Bonanno, Pisa, Italy, Dipartimento di Chimica e Chimica Industriale, Universitá di Pisa, Via Risorgimento 35, Pisa, Italy, Institute for Nanotechnology, National Research Council of Canada, 421 Saskatchewan Drive, Edmonton, Alberta, T6G 2M9 Canada, and Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada
| | - Andriy Kovalenko
- Dipartimento di Bioorganica e Biofarmacia, Universitá di Pisa, Via Bonanno, Pisa, Italy, Dipartimento di Chimica e Chimica Industriale, Universitá di Pisa, Via Risorgimento 35, Pisa, Italy, Institute for Nanotechnology, National Research Council of Canada, 421 Saskatchewan Drive, Edmonton, Alberta, T6G 2M9 Canada, and Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada
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34
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Dommert F, Schmidt J, Qiao B, Zhao Y, Krekeler C, Delle Site L, Berger R, Holm C. A comparative study of two classical force fields on statics and dynamics of [EMIM][BF4] investigated via molecular dynamics simulations. J Chem Phys 2008; 129:224501. [DOI: 10.1063/1.3030948] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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35
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Youngs TGA, Hardacre C. Application of static charge transfer within an ionic-liquid force field and its effect on structure and dynamics. Chemphyschem 2008; 9:1548-58. [PMID: 18613196 DOI: 10.1002/cphc.200800200] [Citation(s) in RCA: 146] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The effects of linear scaling of the atomic charges of a reference potential on the structure, dynamics, and energetics of the ionic liquid 1,3-dimethylimidazolium chloride are investigated. Diffusion coefficients that span over four orders of magnitude are observed between the original model and a scaled model in which the ionic charges are +/-0.5 e. While the three-dimensional structure of the liquid is less affected, the partial radial distribution functions change markedly--with the positive result that for ionic charges of +/-0.7 e, an excellent agreement is observed with ab initio molecular dynamics data. Cohesive energy densities calculated from these partial-charge models are also in better agreement with those calculated from the ab initio data. We postulate that ionic-liquid models in which the ionic charges are assumed to be +/-1 e overestimate the intermolecular attractions between ions, which results in overstructuring, slow dynamics, and increased cohesive energy densities. The use of scaled-charge sets may be of benefit in the simulation of these systems--especially when looking at properties beyond liquid structure--thus providing an alternative to computationally expensive polarisable force fields.
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Affiliation(s)
- Tristan G A Youngs
- Atomistic Simulation Centre, School of Maths and Physics, Queen's University Belfast, Belfast, BT7 1NN, UK.
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36
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Zhang X, Liu Z, Wang W. Screening of ionic liquids to capture CO2by COSMO-RS and experiments. AIChE J 2008. [DOI: 10.1002/aic.11573] [Citation(s) in RCA: 216] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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37
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Paramore S, Cheng L, Berne BJ. A Systematic Comparison of Pairwise and Many-Body Silica Potentials. J Chem Theory Comput 2008; 4:1698-708. [DOI: 10.1021/ct800244q] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Sterling Paramore
- Department of Chemistry, Columbia University, 3000 Broadway, Mail Code 3103, New York City, New York 10027
| | - Liwen Cheng
- Department of Chemistry, Columbia University, 3000 Broadway, Mail Code 3103, New York City, New York 10027
| | - Bruce J. Berne
- Department of Chemistry, Columbia University, 3000 Broadway, Mail Code 3103, New York City, New York 10027
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38
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Porter AR, Liem SY, Popelier PLA. Room temperature ionic liquids containing low water concentrations—a molecular dynamics study. Phys Chem Chem Phys 2008; 10:4240-8. [DOI: 10.1039/b718011j] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Bhargava BL, Balasubramanian S, Klein ML. Modelling room temperature ionic liquids. Chem Commun (Camb) 2008:3339-51. [DOI: 10.1039/b805384g] [Citation(s) in RCA: 152] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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41
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Molecular dynamics simulation of the room-temperature ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.theochem.2007.09.009] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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42
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Bhargava BL, Balasubramanian S. Refined potential model for atomistic simulations of ionic liquid [bmim][PF6]. J Chem Phys 2007; 127:114510. [PMID: 17887860 DOI: 10.1063/1.2772268] [Citation(s) in RCA: 271] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Refined parameters of an atomistic interaction potential model for the room temperature ionic liquid 1-n-butyl,3-methylimidazolium hexafluorophosphate are presented. Classical molecular dynamics simulations have been carried out to validate this fully flexible all-atom model. It predicts the density of the liquid at different temperatures between 300 and 500 K within 1.4% of the experimental value. Intermolecular radial distribution functions and the spatial distribution functions obtained from the new model are in close agreement with ab initio simulations. The calculated diffusion coefficients of ions and the surface tension of the liquid agree well with experiment.
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Affiliation(s)
- B L Bhargava
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560 064, India.
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43
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Wang Y, Jiang W, Yan T, Voth GA. Understanding ionic liquids through atomistic and coarse-grained molecular dynamics simulations. Acc Chem Res 2007; 40:1193-9. [PMID: 17935302 DOI: 10.1021/ar700160p] [Citation(s) in RCA: 244] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Understanding the physical properties of ionic liquids (ILs) via computer simulation is important for their potential technological applications. The goal of our IL research is to obtain a unified understanding of the properties of ILs with respect to their underlying molecular structure. From atomistic molecular dynamics simulations, the many-body electronic polarization effect was found to be important for modeling ILs, especially their dynamics. The multiscale coarse-graining methodology has also been employed to increase the simulation speed by a factor of 100 or more, thereby making it possible to study the mesoscopic behavior of ILs by computer simulations. With these simulation techniques, ILs with an amphiphilic cation were found to exhibit a spatial heterogeneity due to the aggregation of their nonpolar alkyl tails. This spatial heterogeneity is a key feature in interpreting many physical phenomena of ILs, such as their heterogeneous self-diffusion and surface layering, as well as their surfactant-like micelles formed in IL/water mixtures.
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Affiliation(s)
- Yanting Wang
- Center for Biophysical Modeling and Simulation and Department of Chemistry, University of Utah, 315 South 1400 East Room 2020, Salt Lake City, Utah 84112-0850, and Institute of New Energy Material Chemistry and Department of Material Chemistry, Nankai University, Tianjing 300071, China
| | - Wei Jiang
- Center for Biophysical Modeling and Simulation and Department of Chemistry, University of Utah, 315 South 1400 East Room 2020, Salt Lake City, Utah 84112-0850, and Institute of New Energy Material Chemistry and Department of Material Chemistry, Nankai University, Tianjing 300071, China
| | - Tianying Yan
- Center for Biophysical Modeling and Simulation and Department of Chemistry, University of Utah, 315 South 1400 East Room 2020, Salt Lake City, Utah 84112-0850, and Institute of New Energy Material Chemistry and Department of Material Chemistry, Nankai University, Tianjing 300071, China
| | - Gregory A. Voth
- Center for Biophysical Modeling and Simulation and Department of Chemistry, University of Utah, 315 South 1400 East Room 2020, Salt Lake City, Utah 84112-0850, and Institute of New Energy Material Chemistry and Department of Material Chemistry, Nankai University, Tianjing 300071, China
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44
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Lynden-Bell RM, Del Pópolo MG, Youngs TGA, Kohanoff J, Hanke CG, Harper JB, Pinilla CC. Simulations of ionic liquids, solutions, and surfaces. Acc Chem Res 2007; 40:1138-45. [PMID: 17914887 DOI: 10.1021/ar700065s] [Citation(s) in RCA: 246] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We have been using atomistic simulation for the last 10 years to study properties of imidazolium-based ionic liquids. Studies of dissolved molecules show the importance of electrostatic interactions in both aromatic and hydrogen-bonding solutes. However, the local structure strongly depends upon ion-ion and solute-solvent interactions. We find interesting local alignments of cations at the gas-liquid and solid-liquid interfaces, which give a potential drop through the surface. If the solid interface is charged, this charge is strongly screened over distances of a few nanometres and this screening decays on a fast time scale. We have studied the sensitivity of the liquid structure to force-field parameters and show that results from ab initio simulations can be used in the development of force fields.
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Affiliation(s)
- Ruth M Lynden-Bell
- Atomistic Simulation Centre, School of Mathematics and Physics, Queen's University, Belfast BT7 1NN, United Kingdom.
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Del Pópolo MG, Kohanoff J, Lynden-Bell RM, Pinilla C. Clusters, liquids, and crystals of dialkyimidazolium salts. A combined perspective from ab initio and classical computer simulations. Acc Chem Res 2007; 40:1156-64. [PMID: 17979251 DOI: 10.1021/ar700069c] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We summarize results obtained by a combination of ab initio and classical computer simulations of dialkylimidazolium ionic liquids in different states of aggregation, from crystals to liquids and clusters. Unusual features arising from the competition between electrostatic, dispersion, and hydrogen-bonding interactions are identified at the origin of observed structural patterns. We also discuss the way Brønsted acids interact with ionic liquids leading to the formation of hydrogen-bonded anions.
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Affiliation(s)
- Mario G. Del Pópolo
- Atomistic Simulation Centre, School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, U.K., and University Chemical Laboratory, Lensfield Road, Cambridge University, Cambridge CB2 1EW, U.K
| | - Jorge Kohanoff
- Atomistic Simulation Centre, School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, U.K., and University Chemical Laboratory, Lensfield Road, Cambridge University, Cambridge CB2 1EW, U.K
| | - Ruth M. Lynden-Bell
- Atomistic Simulation Centre, School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, U.K., and University Chemical Laboratory, Lensfield Road, Cambridge University, Cambridge CB2 1EW, U.K
| | - Carlos Pinilla
- Atomistic Simulation Centre, School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, U.K., and University Chemical Laboratory, Lensfield Road, Cambridge University, Cambridge CB2 1EW, U.K
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Tóth G. Effective potentials from complex simulations: a potential-matching algorithm and remarks on coarse-grained potentials. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2007; 19:335222. [PMID: 21694144 DOI: 10.1088/0953-8984/19/33/335222] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The projection of complex interactions onto simple distance-dependent or angle-dependent classical mechanical functions is a long-standing theoretical challenge in the field of computational sciences concerning biomolecules, colloids, aggregates and simple systems as well. The construction of an effective potential may be based on theoretical assumptions, on the application of fitting procedures on experimental data and on the simplification of complex molecular simulations. Recently, a force-matching method was elaborated to project the data of Car-Parrinello ab initio molecular dynamics simulations onto two-particle classical interactions (Izvekov et al 2004 J. Chem. Phys. 120 10896). We have developed a potential-matching algorithm as a practical analogue of this force-matching method. The algorithm requires a large number of configurations (particle positions) and a single value of the potential energy for each configuration. We show the details of the algorithm and the test calculations on simple systems. The test calculation on water showed an example in which a similar structure was obtained for qualitatively different pair interactions. The application of the algorithm on reverse Monte Carlo configurations was tried as well. We detected inconsistencies in a part of our calculations. We found that the coarse graining of potentials cannot be performed perfectly both for the structural and the thermodynamic data. For example, if one applies an inverse method with an input of the pair-correlation function, it provides energetics data for the configurations uniquely. These energetics data can be different from the desired ones obtained by all atom simulations, as occurred in the testing of our potential-matching method.
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Affiliation(s)
- Gergely Tóth
- Institute of Chemistry, Eötvös University, PO Box 32, H-1518 Budapest, Hungary
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