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Ketkaew R, Luber S. DeepCV: A Deep Learning Framework for Blind Search of Collective Variables in Expanded Configurational Space. J Chem Inf Model 2022; 62:6352-6364. [PMID: 36445176 DOI: 10.1021/acs.jcim.2c00883] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
We present Deep learning for Collective Variables (DeepCV), a computer code that provides an efficient and customizable implementation of the deep autoencoder neural network (DAENN) algorithm that has been developed in our group for computing collective variables (CVs) and can be used with enhanced sampling methods to reconstruct free energy surfaces of chemical reactions. DeepCV can be used to conveniently calculate molecular features, train models, generate CVs, validate rare events from sampling, and analyze a trajectory for chemical reactions of interest. We use DeepCV in an example study of the conformational transition of cyclohexene, where metadynamics simulations are performed using DAENN-generated CVs. The results show that the adopted CVs give free energies in line with those obtained by previously developed CVs and experimental results. DeepCV is open-source software written in Python/C++ object-oriented languages, based on the TensorFlow framework and distributed free of charge for noncommercial purposes, which can be incorporated into general molecular dynamics software. DeepCV also comes with several additional tools, i.e., an application program interface (API), documentation, and tutorials.
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Affiliation(s)
- Rangsiman Ketkaew
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - Sandra Luber
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
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2
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Pu JC, Doka Dari M, Tang XQ, Yuan PQ. Diffusion of benzene through water film confined in silica mesopores: Effect of competitive adsorption of solvent. Chem Eng Sci 2020. [DOI: 10.1016/j.ces.2020.115793] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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3
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Yu XL, Li Y, Xin SM, Yuan PQ, Yuan WK. Partial Hydrogenation of Benzene to Cyclohexene on Ru@XO2 (X = Ti, Zr, or Si). Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.7b04642] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xue-Lian Yu
- State
Key Laboratory of Chemical Engineering and ‡School of Chemistry and Molecular
Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Yan Li
- State
Key Laboratory of Chemical Engineering and ‡School of Chemistry and Molecular
Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Shuang-Mei Xin
- State
Key Laboratory of Chemical Engineering and ‡School of Chemistry and Molecular
Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Pei-Qing Yuan
- State
Key Laboratory of Chemical Engineering and ‡School of Chemistry and Molecular
Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Wei-Kang Yuan
- State
Key Laboratory of Chemical Engineering and ‡School of Chemistry and Molecular
Engineering, East China University of Science and Technology, Shanghai 200237, China
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4
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Maier JM, Li P, Vik EC, Yehl CJ, Strickland SMS, Shimizu KD. Measurement of Solvent OH−π Interactions Using a Molecular Balance. J Am Chem Soc 2017; 139:6550-6553. [DOI: 10.1021/jacs.7b02349] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Josef M. Maier
- Department
of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Ping Li
- Department
of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Erik C. Vik
- Department
of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Christopher J. Yehl
- Department
of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Sharon M. S. Strickland
- Department
of Biology, Chemistry, and Physics, Converse College, Spartanburg, South Carolina 29302, United States
| | - Ken D. Shimizu
- Department
of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
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Sharma D, Paterson MJ. Ground and excited states of naphthalene–water (naphtha–W6) clusters: a computational study. RSC Adv 2015. [DOI: 10.1039/c5ra01894c] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
An MP2 and DFT study of the structures of naphthalene–water hexamer clusters has been performed for both the prism and cage forms of the cluster.
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Affiliation(s)
- Divya Sharma
- Institute of Chemical Sciences
- School of Engineering and Physical Sciences
- Heriot Watt University
- Edinburgh
- UK
| | - Martin J. Paterson
- Institute of Chemical Sciences
- School of Engineering and Physical Sciences
- Heriot Watt University
- Edinburgh
- UK
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Sharma D, Paterson MJ. The structure and UV spectroscopy of benzene–water (Bz–W6) clusters using time-dependent density functional theory. Photochem Photobiol Sci 2014; 13:1549-60. [DOI: 10.1039/c4pp00211c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
MP2, DFT and TD-DFT applied to benzene–(water)6 clusters show how both perturb the electronic spectra of each other and give rise to new charge transfer features from the benzene to the water cluster.
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Affiliation(s)
- Divya Sharma
- Institute of Chemical Sciences
- School of Engineering and Physical Sciences
- Heriot Watt University
- Edinburgh, UK
| | - Martin J. Paterson
- Institute of Chemical Sciences
- School of Engineering and Physical Sciences
- Heriot Watt University
- Edinburgh, UK
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Wu P, Chaudret R, Hu X, Yang W. Noncovalent Interaction Analysis in Fluctuating Environments. J Chem Theory Comput 2013; 9:2226-2234. [PMID: 23894230 DOI: 10.1021/ct4001087] [Citation(s) in RCA: 102] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Noncovalent interactions play a central role in many chemical and biological systems. In a previous study, Johnson et al developed a NonCovalent Interaction (NCI) index to characterize and visualize different types of weak interactions. To apply the NCI analysis to fluctuating environments as in solution phase, we here develop a new Averaged NonCovalent Interaction (i.e., aNCI) index along with a fluctuation index to characterize magnitude of interactions and fluctuations. We applied aNCI for various systems including solute-solvent and ligand-protein noncovalent interactions. For water and benzene molecules in aqueous solution, solvation structures and the specific hydrogen bond patterns were visualized clearly. For the Cl-+CH3Cl SN2 reaction in aqueous solution, charge reorganization influences over solvation structure along SN2 reaction were revealed. For ligand-protein systems, aNCI can recover several key fluctuating hydrogen bond patterns that have potential applications for drug design. Therefore, aNCI, as a complementary approach to the original NCI method, can extract and visualize noncovalent interactions from thermal noise in fluctuating environments.
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Affiliation(s)
- Pan Wu
- Department of Chemistry, Duke University, Durham, NC 27708
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Das TN, Dey GR. Methane from benzene in argon dielectric barrier discharge. JOURNAL OF HAZARDOUS MATERIALS 2013; 248-249:469-477. [PMID: 23419905 DOI: 10.1016/j.jhazmat.2013.01.028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2012] [Revised: 12/21/2012] [Accepted: 01/15/2013] [Indexed: 06/01/2023]
Abstract
A first-time account of direct, on-line, instantaneous and efficient chemical conversion of gas phase benzene to methane in argon Dielectric Barrier Discharge (DBD) is presented. In the absence of another overt hydrogen-donating source, potency of analogous parents toward methane generation is found to follow the order: benzene>toluene>p-xylene. Simultaneous production of trace amounts of phenolic surface deposits suggest (a) prompt decomposition of the parent molecules, including a large fraction yielding atomic transients (H-atom), (b) continuous and appropriate recombination of such parts, and (c) trace moisture in parent contributing OH radicals and additional H-atoms, which suitably react with the unreacted fraction of the parent, and also other intermediates. Results highlight Ar DBD to be a simple and exploitable technology for transforming undesirable hazardous aromatics to usable/useful low molecular weight open-chain products following the principles of green chemistry and engineering.
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Affiliation(s)
- Tomi Nath Das
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
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Garrido L, Pozuelo J, López-González M, Yan G, Fang J, Riande E. Influence of the water content on the diffusion coefficients of Li+ and water across naphthalenic based copolyimide cation-exchange membranes. J Phys Chem B 2012; 116:11754-66. [PMID: 22957828 DOI: 10.1021/jp3065322] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The transport of lithium ions in cation-exchange membranes based on sulfonated copolyimide membranes is reported. Diffusion coefficients of lithium are estimated as a function of the water content in membranes by using pulsed field gradient (PFG) NMR and electrical conductivity techniques. It is found that the lithium transport slightly decreases with the diminution of water for membranes with water content lying in the range 14 < λ < 26.5, where λ is the number of molecules of water per fixed sulfonate group. For λ < 14, the value of the diffusion coefficient of lithium experiences a sharp decay with the reduction of water in the membranes. The dependence of the diffusion of lithium on the humidity of the membranes calculated from conductivity data using Nernst-Planck type equations follows a trend similar to that observed by NMR. The possible explanation of the fact that the Haven ratio is higher than the unit is discussed. The diffusion of water estimated by (1)H PFG-NMR in membranes neutralized with lithium decreases as λ decreases, but the drop is sharper in the region where the decrease of the diffusion of protons of water also undergoes considerable reduction. The diffusion of lithium ions computed by full molecular dynamics is similar to that estimated by NMR. However, for membranes with medium and low concentration of water, steady state conditions are not reached in the computations and the diffusion coefficients obtained by MD simulation techniques are overestimated. The curves depicting the variation of the diffusion coefficient of water estimated by NMR and full dynamics follow parallel trends, though the values of the diffusion coefficient in the latter case are somewhat higher. The WAXS diffractograms of fully hydrated membranes exhibit the ionomer peak at q = 2.8 nm(-1), the peak being shifted to higher q as the water content of the membranes decreases. The diffractograms present additional peaks at higher q, common to wet and dry membranes, but the peaks are better resolved in the wet membranes. The ionomer peak is not detected in the diffractograms of dry membranes.
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Affiliation(s)
- Leoncio Garrido
- Departamento de Química Física, Instituto de Ciencia y Tecnología de Polímeros, Consejo Superior de Investigaciones Científicas (ICTP-CSIC), 28006 Madrid, Spain
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10
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Abstract
The unusual interactions in organic liquids such as methane derivatives, arenes, and alkanes by the infrared (IR) method were revealed. The transformations of molecular shapes, arising from nonclassical hydrogen and dihydrogen bonds, as well as water factor provide the existence of supramolecular structures in organic fluids. The interpretation of the obtained results in terms of the quantum-chemical calculations has been suggested.
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Slipchenko LV, Gordon MS. Water-benzene interactions: an effective fragment potential and correlated quantum chemistry study. J Phys Chem A 2010; 113:2092-102. [PMID: 19072625 DOI: 10.1021/jp808845b] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Structures and binding in small water-benzene complexes (1-8 water molecules and 1-2 benzene molecules) are studied using the general effective fragment potential (EFP) method. The lowest energy conformers of the clusters were found using a Monte Carlo technique. The binding energies in the smallest clusters (dimers, trimers, and tetramers) were also evaluated with second order perturbation theory (MP2) and coupled cluster theory (CCSD(T)). The EFP method accurately predicts structures and binding energies in the water-benzene complexes. Benzene is polarizable and consequently participates in hydrogen bond networking of water. Since the water-benzene interactions are only slightly weaker than water-water interactions, structures with different numbers of water-water, benzene-water, and benzene-benzene bonds often have very similar binding energies. This is a challenge for computational methods.
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Affiliation(s)
- Lyudmila V Slipchenko
- Department of Chemistry and Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA
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Zhao Y, Ng HT, Hanson E. Benchmark Data for Noncovalent Interactions in HCOOH···Benzene Complexes and Their Use for Validation of Density Functionals. J Chem Theory Comput 2009; 5:2726-33. [DOI: 10.1021/ct900333c] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Yan Zhao
- Commercial Print Engine Lab, HP Laboratories, Hewlett-Packard co. 1501 Page Mill Road, Palo Alto, California 94304
| | - Hou T. Ng
- Commercial Print Engine Lab, HP Laboratories, Hewlett-Packard co. 1501 Page Mill Road, Palo Alto, California 94304
| | - Eric Hanson
- Commercial Print Engine Lab, HP Laboratories, Hewlett-Packard co. 1501 Page Mill Road, Palo Alto, California 94304
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Gordon MS, Slipchenko L, Li H, Jensen JH. Chapter 10 The Effective Fragment Potential: A General Method for Predicting Intermolecular Interactions. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/s1574-1400(07)03010-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
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