1
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Sattasathuchana T, Xu P, Bertoni C, Kim YL, Leang SS, Pham BQ, Gordon MS. The Effective Fragment Molecular Orbital Method: Achieving High Scalability and Accuracy for Large Systems. J Chem Theory Comput 2024; 20:2445-2461. [PMID: 38450638 DOI: 10.1021/acs.jctc.3c01309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2024]
Abstract
The effective fragment molecular orbital (EFMO) method has been developed to predict the total energy of a very large molecular system accurately (with respect to the underlying quantum mechanical method) and efficiently by taking advantage of the locality of strong chemical interactions and employing a two-level hierarchical parallelism. The accuracy of the EFMO method is partly attributed to the accurate and robust intermolecular interaction prediction between distant fragments, in particular, the many-body polarization and dispersion effects, which require the generation of static and dynamic polarizability tensors by solving the coupled perturbed Hartree-Fock (CPHF) and time-dependent HF (TDHF) equations, respectively. Solving the CPHF and TDHF equations is the main EFMO computational bottleneck due to the inefficient (serial) and I/O-intensive implementation of the CPHF and TDHF solvers. In this work, the efficiency and scalability of the EFMO method are significantly improved with a new CPU memory-based implementation for solving the CPHF and TDHF equations that are parallelized by either message passing interface (MPI) or hybrid MPI/OpenMP. The accuracy of the EFMO method is demonstrated for both covalently bonded systems and noncovalently bound molecular clusters by systematically examining the effects of basis sets and a key distance-related cutoff parameter, Rcut. Rcut determines whether a fragment pair (dimer) is treated by the chosen ab initio method or calculated using the effective fragment potential (EFP) method (separated dimers). Decreasing the value of Rcut increases the number of separated (EFP) dimers, thereby decreasing the computational effort. It is demonstrated that excellent accuracy (<1 kcal/mol error per fragment) can be achieved when using a sufficiently large basis set with diffuse functions coupled with a small Rcut value. With the new parallel implementation, the total EFMO wall time is substantially reduced, especially with a high number of MPI ranks. Given a sufficient workload, nearly ideal strong scaling is achieved for the CPHF and TDHF parts of the calculation. For the first time, EFMO calculations with the inclusion of long-range polarization and dispersion interactions on a hydrated mesoporous silica nanoparticle with explicit water solvent molecules (more than 15k atoms) are achieved on a massively parallel supercomputer using nearly 1000 physical nodes. In addition, EFMO calculations on the carbinolamine formation step of an amine-catalyzed aldol reaction at the nanoscale with explicit solvent effects are presented.
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Affiliation(s)
- Tosaporn Sattasathuchana
- Department of Chemistry, Iowa State University and Ames National Laboratory, Ames, Iowa 50011, United States
| | - Peng Xu
- Department of Chemistry, Iowa State University and Ames National Laboratory, Ames, Iowa 50011, United States
| | - Colleen Bertoni
- Argonne Leadership Computing Facility, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Yu Lim Kim
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Sarom S Leang
- EP Analytics, Inc., 9909 Mira Mesa Blvd Ste. 230, San Diego, California 92131, United States
| | - Buu Q Pham
- Department of Chemistry, Iowa State University and Ames National Laboratory, Ames, Iowa 50011, United States
| | - Mark S Gordon
- Department of Chemistry, Iowa State University and Ames National Laboratory, Ames, Iowa 50011, United States
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2
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Romero J, Limão-Vieira P, Hermansson K, Probst M. A Simple Electron-Density Based Force Field Model for High-Energy Interactions between Atoms and Molecules. J Phys Chem A 2024; 128:1163-1172. [PMID: 38320398 PMCID: PMC10875675 DOI: 10.1021/acs.jpca.3c06724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 01/11/2024] [Accepted: 01/11/2024] [Indexed: 02/08/2024]
Abstract
In high-energy molecular dynamics or Monte Carlo simulations, standard force fields optimized for simulations at ambient temperatures are inadequate. This is largely because their repulsive parts have been regarded as not very significant, even well below zero interaction energies. It is, therefore, not obvious which force fields to resort to for simulating hot gases or plasmas. A force field model that uses the electronic densities of noninteracting atoms or molecules within the pair approximation is introduced. We start by deriving a naïve model that neglects any exchange and correlation effects between the electronic clouds and then correct this model by adding a term calibrated from ab initio calculations using the CCSD(T)/cc-pVTZ level of theory. The resulting expression for this term can be regarded as a simple exchange-correlation function. We compare the results for the repulsive part of the potential energy hypersurfaces with the force fields commonly used on some dimers of small molecules.
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Affiliation(s)
- José Romero
- Institute
of Ion Physics and Applied Physics, University
of Innsbruck, Technikerstraße 25, Innsbruck 6020, Austria
- Atomic
and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, Caparica 2829-516, Portugal
| | - Paulo Limão-Vieira
- Atomic
and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, Caparica 2829-516, Portugal
| | - Kersti Hermansson
- Department
of Chemistry-Ångström, Uppsala
University, Uppsala SE-75121, Sweden
| | - Michael Probst
- Institute
of Ion Physics and Applied Physics, University
of Innsbruck, Technikerstraße 25, Innsbruck 6020, Austria
- School
of Molecular Science and Engineering, Vidyasirimedhi
Institute of Science and Technology, Rayong 21210, Thailand
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3
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Xu P, Leonard SL, O'Brien W, Gordon MS. R -8 Dispersion Interaction: Derivation and Application to the Effective Fragment Potential Method. J Phys Chem A 2024; 128:292-327. [PMID: 38150458 DOI: 10.1021/acs.jpca.3c05115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2023]
Abstract
The anisotropic and isotropic R-8 dispersion contributions (disp8) are derived and implemented within the framework of the effective fragment potential (EFP) method formulated with imaginary frequency-dependent Cartesian polarizability tensors distributed at the centroids of the localized molecular orbitals (LMOs). Two forms of damping functions, intermolecular overlap-based and Tang-Toennies, are extended for disp8. To obtain LMO polarizability tensors centered at LMO centroids, an origin-shifting transformation is derived and implemented for the dipole-octopole polarizability tensor and the quadrupole-quadrupole polarizability tensor. The analytic gradient is derived and implemented for the isotropic disp8 contribution. Relative to the previously implemented empirical EFP disp8 energy, the isotropic disp8 component of the interaction energy improves the overall agreement of the EFP dispersion energies with the symmetry-adapted perturbation theory (SAPT) benchmarks, reducing the mean absolute errors (MAEs) and mean absolute percentage errors for most of the databases examined in this work. While the anisotropic disp8 can further enhance the accuracy of the EFP dispersion energy and yield smaller MAEs, significantly overbound dispersion energies are predicted by the anisotropic disp8 when the maximum element in the intermolecular overlap matrix is greater than 0.1, possibly due to the breakdown of the approximations made in the EFP dispersion derivation at a short range. For potential energy scan databases, the newly developed EFP dispersion model with isotropic disp8 yields the overall correct curvature and good agreement with SAPT benchmarks around equilibrium and longer but overestimates the dispersion interactions at a short range. While the overlap-based dispersion-damping functions produce better MAEs than Tang-Toennies damping functions, further improvement is needed to better screen the large attractive dispersion energies at a short range (overlap >0.1).
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Affiliation(s)
- Peng Xu
- Department of Chemistry, Iowa State University and Ames National Laboratory, Ames, Iowa 50014, United States
| | - Samuel L Leonard
- Department of Chemistry, Iowa State University and Ames National Laboratory, Ames, Iowa 50014, United States
| | - William O'Brien
- Science Undergraduate Research Internship (SULI): Department of Energy, Ames National Laboratory, Iowa State University, Ames, Iowa50011-3020, United States
| | - Mark S Gordon
- Department of Chemistry, Iowa State University and Ames National Laboratory, Ames, Iowa 50014, United States
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4
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Grimm LM, Setiadi J, Tkachenko B, Schreiner PR, Gilson MK, Biedermann F. The temperature-dependence of host-guest binding thermodynamics: experimental and simulation studies. Chem Sci 2023; 14:11818-11829. [PMID: 37920355 PMCID: PMC10619620 DOI: 10.1039/d3sc01975f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2023] [Accepted: 09/24/2023] [Indexed: 11/04/2023] Open
Abstract
The thermodynamic parameters of host-guest binding can be used to describe, understand, and predict molecular recognition events in aqueous systems. However, interpreting binding thermodynamics remains challenging, even for these relatively simple molecules, as they are determined by both direct and solvent-mediated host-guest interactions. In this contribution, we focus on the contributions of water to binding by studying binding thermodynamics, both experimentally and computationally, for a series of nearly rigid, electrically neutral host-guest systems and report the temperature-dependent thermodynamic binding contributions ΔGb(T), ΔHb(T), ΔSb(T), and ΔCp,b. Combining isothermal titration calorimetry (ITC) measurements with molecular dynamics (MD) simulations, we provide insight into the binding forces at play for the macrocyclic hosts cucurbit[n]uril (CBn, n = 7-8) and β-cyclodextrin (β-CD) with a range of guest molecules. We find consistently negative changes in heat capacity on binding (ΔCp,b) for all systems studied herein - as well as for literature host-guest systems - indicating increased enthalpic driving forces for binding at higher temperatures. We ascribe these trends to solvation effects, as the solvent properties of water deteriorate as temperature rises. Unlike the entropic and enthalpic contributions to binding, with their differing signs and magnitudes for the classical and non-classical hydrophobic effect, heat capacity changes appear to be a unifying and more general feature of host-guest complex formation in water. This work has implications for understanding protein-ligand interactions and other complex systems in aqueous environments.
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Affiliation(s)
- Laura M Grimm
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Jeffry Setiadi
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego 9255 Pharmacy Lane La Jolla CA 92093 USA
| | - Boryslav Tkachenko
- Institute of Organic Chemistry, Justus Liebig University Giessen Heinrich-Buff-Ring 17 35392 Giessen Germany
| | - Peter R Schreiner
- Institute of Organic Chemistry, Justus Liebig University Giessen Heinrich-Buff-Ring 17 35392 Giessen Germany
| | - Michael K Gilson
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego 9255 Pharmacy Lane La Jolla CA 92093 USA
| | - Frank Biedermann
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz Platz 1 76344 Eggenstein-Leopoldshafen Germany
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5
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Petrusevich EF, Bousquet MHE, Ośmiałowski B, Jacquemin D, Luis JM, Zaleśny R. Cost-Effective Simulations of Vibrationally-Resolved Absorption Spectra of Fluorophores with Machine-Learning-Based Inhomogeneous Broadening. J Chem Theory Comput 2023; 19:2304-2315. [PMID: 37096370 PMCID: PMC10134414 DOI: 10.1021/acs.jctc.2c01285] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/08/2023]
Abstract
The results of electronic and vibrational structure simulations are an invaluable support for interpreting experimental absorption/emission spectra, which stimulates the development of reliable and cost-effective computational protocols. In this work, we contribute to these efforts and propose an efficient first-principle protocol for simulating vibrationally-resolved absorption spectra, including nonempirical estimations of the inhomogeneous broadening. To this end, we analyze three key aspects: (i) a metric-based selection of density functional approximation (DFA) so to benefit from the computational efficiency of time-dependent density function theory (TD-DFT) while safeguarding the accuracy of the vibrationally-resolved spectra, (ii) an assessment of two vibrational structure schemes (vertical gradient and adiabatic Hessian) to compute the Franck-Condon factors, and (iii) the use of machine learning to speed up nonempirical estimations of the inhomogeneous broadening. In more detail, we predict the absorption band shapes for a set of 20 medium-sized fluorescent dyes, focusing on the bright ππ★ S0 → S1 transition and using experimental results as references. We demonstrate that, for the studied 20-dye set which includes structures with large structural variability, the preselection of DFAs based on an easily accessible metric ensures accurate band shapes with respect to the reference approach and that range-separated functionals show the best performance when combined with the vertical gradient model. As far as band widths are concerned, we propose a new machine-learning-based approach for determining the inhomogeneous broadening induced by the solvent microenvironment. This approach is shown to be very robust offering inhomogeneous broadenings with errors as small as 2 cm-1 with respect to genuine electronic-structure calculations, with a total CPU time reduced by 98%.
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Affiliation(s)
- Elizaveta F. Petrusevich
- Faculty of Chemistry, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, PL-50370 Wrocław, Poland
- Institute of Computational Chemistry and Catalysis and Department of Chemistry, University of Girona, Campus de Montilivi, 17003 Girona, Catalonia, Spain
| | | | - Borys Ośmiałowski
- Faculty of Chemistry, Nicolaus Copernicus University, Gagarina Street 7, PL-87-100 Toruń, Poland
| | - Denis Jacquemin
- Nantes Université, CNRS, CEISAM UMR 6230, F-44000 Nantes, France
- Institut Universitaire de France (IUF), F-75005 Paris, France
| | - Josep M. Luis
- Institute of Computational Chemistry and Catalysis and Department of Chemistry, University of Girona, Campus de Montilivi, 17003 Girona, Catalonia, Spain
| | - Robert Zaleśny
- Faculty of Chemistry, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, PL-50370 Wrocław, Poland
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6
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Vinklárek IS, Pysanenko A, Pluhařová E, Fárník M. Uptake of Hydrogen Bonding Molecules by Benzene Nanoparticles. J Phys Chem Lett 2022; 13:3781-3788. [PMID: 35446589 PMCID: PMC9082588 DOI: 10.1021/acs.jpclett.2c00835] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The uptake of molecules on nanometer-size clusters of polyaromatic hydrocarbons (PAHs) is important for the condensation of water on PAH aerosols in the atmosphere and for ice mantle growth on nanoparticles in the interstellar medium. We generate benzene clusters BzN of mean size N̅ ≈ 300 (radius R̅ ≈ 2.2 Å) as a model system for the PAH nanoparticles. Using molecular beams and mass spectrometry detection, we investigate the uptake of water, methanol, and ethanol by these clusters. All picked up molecules are highly mobile on BzN and generate clusters within <3 ms. The relative uptakes for the different investigated molecules can be directly compared and quantified. Water molecules exhibit the lowest relative pickup probability that is ∼30% lower than those for methanol and ethanol, which are approximately the same.
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Affiliation(s)
- Ivo S. Vinklárek
- Department
of Dynamics of Molecules and Clusters, J.
Heyrovský Institute of Physical Chemistry, v.v.i., The Czech
Academy of Sciences, Dolejškova 2155/3, 182 23 Prague, Czech Republic
- Department
of Chemical Physics and Optics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague, Czech Republic
| | - Andriy Pysanenko
- Department
of Dynamics of Molecules and Clusters, J.
Heyrovský Institute of Physical Chemistry, v.v.i., The Czech
Academy of Sciences, Dolejškova 2155/3, 182 23 Prague, Czech Republic
| | - Eva Pluhařová
- Department
of Computational Chemistry, J. Heyrovský
Institute of Physical Chemistry, v.v.i., The Czech Academy of Sciences, Dolejškova 2155/3, 182 23 Prague, Czech Republic
| | - Michal Fárník
- Department
of Dynamics of Molecules and Clusters, J.
Heyrovský Institute of Physical Chemistry, v.v.i., The Czech
Academy of Sciences, Dolejškova 2155/3, 182 23 Prague, Czech Republic
- . Phone: +420 2 6605 3206. Fax: +420 2 6605 3910
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7
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Kim YL, Evans JW, Gordon MS. Molecular interactions in diffusion-controlled aldol condensation with mesoporous silica nanoparticles. Phys Chem Chem Phys 2022; 24:10475-10487. [PMID: 35441640 DOI: 10.1039/d2cp00952h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The aldol reaction of p-nitrobenzaldehyde in amino-catalyzed mesoporous silica nanoparticles (MSN) has revealed varying catalytic activity with the size of the pores of MSN. The pore size dependence related to the reactivity indicates that the diffusion process is important. A detailed molecular-level analysis for understanding diffusion requires assessment of the noncovalent interactions of the molecular species involved in the aldol reaction with each other, with the solvent, and with key functional groups on the pore surface. Such an analysis is presented here based upon the effective fragment potential (EFP). The EFP method can calculate the intermolecular interactions, decomposed into Coulomb, polarization, dispersion, exchange-repulsion, and charge-transfer interactions. In this study, the potential energy surfaces corresponding to each intermolecular interaction are analyzed for homo- and hetero-dimers with various configurations. The monomers that compose dimers are five molecules such as p-nitrobenzaldehyde, acetone, n-hexane, propylamine, and silanol. The results illustrate that the dispersion interaction is crucial in most dimers.
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Affiliation(s)
- Yu Lim Kim
- Ames Laboratory - US Department of Energy, Iowa State University, Ames, Iowa 50011, USA.,Department of Chemistry, Iowa State University, Ames, Iowa 50010, USA
| | - James W Evans
- Ames Laboratory - US Department of Energy, Iowa State University, Ames, Iowa 50011, USA.,Department of Physics, Iowa State University, Ames, Iowa 50011, USA
| | - Mark S Gordon
- Ames Laboratory - US Department of Energy, Iowa State University, Ames, Iowa 50011, USA.,Department of Chemistry, Iowa State University, Ames, Iowa 50010, USA
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8
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Rostkowski M, Schürner HKV, Sowińska A, Vasquez L, Przydacz M, Elsner M, Dybala-Defratyka A. Isotope Effects on the Vaporization of Organic Compounds from an Aqueous Solution-Insight from Experiment and Computations. J Phys Chem B 2021; 125:13868-13885. [PMID: 34908428 PMCID: PMC8724799 DOI: 10.1021/acs.jpcb.1c05574] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
An isotope fractionation
analysis of organic groundwater pollutants
can assess the remediation at contaminated sites yet needs to consider
physical processes as potentially confounding factors. This study
explores the predictability of water–air partitioning isotope
effects from experiments and computational predictions for benzene
and trimethylamine (both H-bond acceptors) as well as chloroform (H-bond
donor). A small, but significant, isotope fractionation of different
direction and magnitude was measured with ε = −0.12‰
± 0.07‰ (benzene), εC = 0.49‰
± 0.23‰ (triethylamine), and εH = 1.79‰
± 0.54‰ (chloroform) demonstrating that effects do not
correlate with expected hydrogen-bond functionalities. Computations
revealed that the overall isotope effect arises from contributions
of different nature and extent: a weakening of intramolecular vibrations
in the condensed phase plus additional vibrational modes from a complexation
with surrounding water molecules. Subtle changes in benzene contrast
with a stronger coupling between intra- and intermolecular modes in
the chloroform–water system and a very local vibrational response
with few atoms involved in a specific mode of triethylamine. An energy
decomposition analysis revealed that each system was affected differently
by electrostatics and dispersion, where dispersion was dominant for
benzene and electrostatics dominated for chloroform and triethylamine.
Interestingly, overall stabilization patterns in all studied systems
originated from contributions of dispersion rather than other energy
terms.
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Affiliation(s)
- Michał Rostkowski
- Institute of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Heide K V Schürner
- Chair of Analytical Chemistry and Water Chemistry, Technical University of Munich, Elisabeth-Winterhalter-Weg 6, 81377 Munich, Germany
| | - Agata Sowińska
- Institute of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Luis Vasquez
- Institute of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Martyna Przydacz
- Institute of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Martin Elsner
- Chair of Analytical Chemistry and Water Chemistry, Technical University of Munich, Elisabeth-Winterhalter-Weg 6, 81377 Munich, Germany
| | - Agnieszka Dybala-Defratyka
- Institute of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
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9
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Dunham AS, Beltrao P. Exploring amino acid functions in a deep mutational landscape. Mol Syst Biol 2021; 17:e10305. [PMID: 34292650 PMCID: PMC8297461 DOI: 10.15252/msb.202110305] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 06/29/2021] [Accepted: 06/30/2021] [Indexed: 12/21/2022] Open
Abstract
Amino acids fulfil a diverse range of roles in proteins, each utilising its chemical properties in different ways in different contexts to create required functions. For example, cysteines form disulphide or hydrogen bonds in different circumstances and charged amino acids do not always make use of their charge. The repertoire of amino acid functions and the frequency at which they occur in proteins remains understudied. Measuring large numbers of mutational consequences, which can elucidate the role an amino acid plays, was prohibitively time-consuming until recent developments in deep mutational scanning. In this study, we gathered data from 28 deep mutational scanning studies, covering 6,291 positions in 30 proteins, and used the consequences of mutation at each position to define a mutational landscape. We demonstrated rich relationships between this landscape and biophysical or evolutionary properties. Finally, we identified 100 functional amino acid subtypes with a data-driven clustering analysis and studied their features, including their frequencies and chemical properties such as tolerating polarity, hydrophobicity or being intolerant of charge or specific amino acids. The mutational landscape and amino acid subtypes provide a foundational catalogue of amino acid functional diversity, which will be refined as the number of studied protein positions increases.
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Affiliation(s)
- Alistair S Dunham
- European Molecular Biology LaboratoryEuropean Bioinformatics Institute (EMBL‐EBI)CambridgeUK
| | - Pedro Beltrao
- European Molecular Biology LaboratoryEuropean Bioinformatics Institute (EMBL‐EBI)CambridgeUK
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10
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Wang L, Zhang S, Wang Y, Zhang B. Dispersion-induced structural preference in the ultrafast dynamics of diphenyl ether. RSC Adv 2020; 10:18093-18098. [PMID: 35517230 PMCID: PMC9053750 DOI: 10.1039/d0ra02224a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Accepted: 04/28/2020] [Indexed: 11/21/2022] Open
Abstract
Dispersion interactions are omnipresent in large aromatic systems and influence the dynamics as intermolecular forces. The structural preference induced by dispersion interactions is demonstrated to influence the excited state dynamics of diphenyl ether (DPE) using femtosecond time-resolved transient absorption (TA) associated with quantum chemical calculations. The experimental results in aprotic solvents show that the S1 state is populated upon irradiation at 267 nm with excess vibrational energy dissipating to solvent molecules in several picoseconds, and then decays via internal conversion (IC) within 50 ps as well as intersystem crossing (ISC) and fluorescence with a lifetime of nanoseconds. The polarity of the solvent disturbs the excited state energies and enhances the energy barriers of the ISC channel. Furthermore, the intermolecular dispersion interactions with protic solvents result in the OH–π isomer dominating in methanol and the OH–O isomer is slightly preferred in t-butanol in the ground state. The hydrogen bonded isomer measurements show an additional change from OH–O to OH–π geometry in the first 1 ps besides the relaxation processes in aprotic solvents. The time constants measured in the TA spectra suggest that the OH–O isomer facilitates IC. The results show that the OH–π isomer has a more rigid structure and a higher barrier for IC, making it harder to reach the geometric conical intersection through conformer rearrangement. This work enables us to have a good knowledge of how the structural preference induced by dispersion interactions affects excited state dynamics of the heteroaromatic compounds. Dispersion interactions are omnipresent in large aromatic systems and influence the dynamics as intermolecular forces.![]()
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Affiliation(s)
- Lian Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics
- Innovation Academy for Precision Measurement Science and Technology
- Chinese Academy of Sciences
- Wuhan 430071
- China
| | - Song Zhang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics
- Innovation Academy for Precision Measurement Science and Technology
- Chinese Academy of Sciences
- Wuhan 430071
- China
| | - Ye Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics
- Innovation Academy for Precision Measurement Science and Technology
- Chinese Academy of Sciences
- Wuhan 430071
- China
| | - Bing Zhang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics
- Innovation Academy for Precision Measurement Science and Technology
- Chinese Academy of Sciences
- Wuhan 430071
- China
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11
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Brandenburg JG, Zen A, Alfè D, Michaelides A. Interaction between water and carbon nanostructures: How good are current density functional approximations? J Chem Phys 2019; 151:164702. [DOI: 10.1063/1.5121370] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Affiliation(s)
- Jan Gerit Brandenburg
- Interdisciplinary Center for Scientific Computing, University of Heidelberg, Im Neuenheimer Feld 205A, 69120 Heidelberg, Germany
| | - Andrea Zen
- Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, United Kingdom
- Thomas Young Centre and London Centre for Nanotechnology, 17-19 Gordon Street, London WC1H 0AH, United Kingdom
| | - Dario Alfè
- Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, United Kingdom
- Thomas Young Centre and London Centre for Nanotechnology, 17-19 Gordon Street, London WC1H 0AH, United Kingdom
- Dipartimento di Fisica Ettore Pancini, Università di Napoli Federico II, Monte S. Angelo, I-80126 Napoli, Italy
| | - Angelos Michaelides
- Thomas Young Centre and London Centre for Nanotechnology, 17-19 Gordon Street, London WC1H 0AH, United Kingdom
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom
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12
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Loeffler JR, Schauperl M, Liedl KR. Hydration of Aromatic Heterocycles as an Adversary of π-Stacking. J Chem Inf Model 2019; 59:4209-4219. [PMID: 31566975 PMCID: PMC7032848 DOI: 10.1021/acs.jcim.9b00395] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hydration is one of the key players in the protein-ligand binding process. It not only influences the binding process per se, but also the drug's absorption, distribution, metabolism, and excretion properties. To gain insights into the hydration of aromatic cores, the solvation thermodynamics of 40 aromatic mono- and bicyclic systems, frequently occurring in medicinal chemistry, are investigated. Thermodynamics is analyzed with two different methods: grid inhomogeneous solvation theory (GIST) and thermodynamic integration (TI). Our results agree well with previously published experimental and computational solvation free energies. The influence of adding heteroatoms to aromatic systems and how the position of these heteroatoms impacts the compound's interactions with water is studied. The solvation free energies of these heteroaromatics are highly correlated to their gas phase interaction energies with benzene: compounds showing a high interaction energy also have a high solvation free energy value. Therefore, replacing a compound with one having a higher gas phase interaction energy might not result in the expected improvement in affinity. The desolvation costs counteract the higher stacking interactions, hence weakening or even inverting the expected gain in binding free energy.
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Affiliation(s)
- Johannes R Loeffler
- Institute of General, Inorganic and Theoretical Chemistry, and Center of Molecular Biosciences Innsbruck (CMBI) , University of Innsbruck , Innrain 80-82 , A-6020 Innsbruck , Tyrol , Austria
| | - Michael Schauperl
- Skaggs School of Pharmacy and Pharmaceutical Sciences , University of California, San Diego , La Jolla , California 92039-0736 , United States
| | - Klaus R Liedl
- Institute of General, Inorganic and Theoretical Chemistry, and Center of Molecular Biosciences Innsbruck (CMBI) , University of Innsbruck , Innrain 80-82 , A-6020 Innsbruck , Tyrol , Austria
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13
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Sattasathuchana T, Xu P, Gordon MS. An Accurate Quantum-Based Approach to Explicit Solvent Effects: Interfacing the General Effective Fragment Potential Method with Ab Initio Electronic Structure Theory. J Phys Chem A 2019; 123:8460-8475. [PMID: 31365250 DOI: 10.1021/acs.jpca.9b05801] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
An interface between ab initio quantum mechanics (QM) methods and the general effective fragment potential (EFP2) method, QM-EFP2, is implemented in which the intermolecular interactions between a QM molecule and EFP fragments consist of Coulomb, polarization, exchange repulsion (exrep), and dispersion components. In order to ensure accuracy in the QM-EFP2 exrep interaction energy, the EFP2-EFP2 spherical Gaussian overlap (SGO) approximation is abandoned and replaced with the exact electron repulsion integrals (ERI) that are evaluated with a direct method to reduce disk usage. A Gaussian damping function for the QM-EFP2 Coulomb component damps both the EFP nuclear and electronic charges. A new overlap damping function has been implemented for the QM-EFP2 dispersion component. The current QM-EFP2 implementation has been benchmarked with the S22 and S66 data sets and demonstrates excellent agreement with symmetry-adapted perturbation theory (SAPT) for component energies and with coupled cluster theory [CCSD(T)] for the total interaction energies. Water clusters of various sizes (up to 256 water molecules) have been tested; it is shown that the QM-EFP2 method has an accuracy that is comparable to that of EFP2-EFP2. It has been shown previously that the accuracy of EFP2-EFP2 intermolecular interactions is comparable to that of second-order perturbation theory (MP2) or better. The implementation of the distributed data interface (DDI) parallelization scheme significantly improves the efficiency of QM-EFP2 calculations. The time to form the QM-EFP2 Fock operator per SCF iteration for water clusters scales linearly with the number EFP basis functions.
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Affiliation(s)
- Tosaporn Sattasathuchana
- Department of Chemistry , Iowa State University and Ames Laboratory Ames , Iowa 50011 , United States
| | - Peng Xu
- Department of Chemistry , Iowa State University and Ames Laboratory Ames , Iowa 50011 , United States
| | - Mark S Gordon
- Department of Chemistry , Iowa State University and Ames Laboratory Ames , Iowa 50011 , United States
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14
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Choudhary A, Chandra A. An ab initio molecular dynamics study of benzene in water at supercritical conditions: Structure, dynamics, and polarity of hydration shell water and the solute. J Chem Phys 2019; 151:044508. [PMID: 31370512 DOI: 10.1063/1.5094570] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Anisotropic structure and dynamics of the hydration shell of a benzene solute in supercritical water are investigated by means of ab initio molecular dynamics simulations. The polarity and structural distortion of the benzene solute in supercritical water are also investigated in this study. Calculations are done at 673 K for three different densities of the solvent. The simulations are carried out using the Becke-Lee-Yang-Parr (BLYP) and also the Becke-Lee-Yang-Parr functional including dispersion corrections of Grimme (BYLP-D). The structural anisotropy is found to exist even at supercritical conditions as elucidated by the radial distribution functions of different conical regions and also by angular and spatial distribution functions. The benzene-water πH-bond and also the water-water hydrogen bonds are found to exist even at the supercritical temperature of 673 K. However, the numbers of these hydrogen bonds are reduced substantially with a decrease in water density. The water molecules in the axial region of benzene are found to be preferably oriented with one OH vector pointing toward the benzene ring, whereas the water molecules located in the equatorial region are found to orient their dipoles mostly parallel to the ring plane. The orientational distributions, however, are found to be rather broad at the supercritical temperature due to thermal fluctuations. Although the water molecules have faster dynamics at these supercritical conditions, a slight difference is observed in the dynamics of the solvation shell and bulk molecules. The conformational flexibility of the ring is found to be enhanced which causes an increase in polarity of the benzene solute in water under supercritical conditions.
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Affiliation(s)
- Ashu Choudhary
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Amalendu Chandra
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
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15
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An investigation of corrosion and sedimentation in the air cooler tubes of benzene drying column in linear alkyl benzene production plant. CHEMICAL PAPERS 2019. [DOI: 10.1007/s11696-019-00776-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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16
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Long-lived water clusters in hydrophobic solvents investigated by standard NMR techniques. Sci Rep 2019; 9:223. [PMID: 30659206 PMCID: PMC6338722 DOI: 10.1038/s41598-018-36787-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Accepted: 11/23/2018] [Indexed: 12/18/2022] Open
Abstract
Unusual physical characteristics of water can be easier explained and understood if properties of water clusters are revealed. Experimental investigation of water clusters has been reported by highly specialized equipment and/or harsh experimental conditions and has not determined the properties and the formation processes. In the current work, we used standard 1H-NMR as a versatile and facile tool to quantitatively investigate water clusters in the liquid phase under ambient conditions. This approach allows collection of data regarding the formation, long lifetime, stability, and physical properties of water clusters, as a cubic octamer in the liquid phase.
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17
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Shirai S, Waki M, Maegawa Y, Yamada Y, Inagaki S. Effects of pore surfaces on the electronic states of metal complexes formed on bipyridine periodic mesoporous organosilica. NEW J CHEM 2019. [DOI: 10.1039/c8nj06277c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A combined experimental–theoretical study clarifies correlations between the pore-surface structures and the electronic properties of metal complexes on BPy-PMO.
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Affiliation(s)
| | - Minoru Waki
- Toyota Central R&D Laboratories, Inc
- Nagakute
- Japan
| | | | - Yuri Yamada
- Toyota Central R&D Laboratories, Inc
- Nagakute
- Japan
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18
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Rahman M, Al-Abadleh HA. Surface Water Structure and Hygroscopic Properties of Light Absorbing Secondary Organic Polymers of Atmospheric Relevance. ACS OMEGA 2018; 3:15519-15529. [PMID: 31458208 PMCID: PMC6644084 DOI: 10.1021/acsomega.8b02066] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Accepted: 11/01/2018] [Indexed: 06/09/2023]
Abstract
Hygroscopic properties and chemical reactivity of secondary organic aerosols (SOA) influence their overall contribution to the indirect effect on the climate. In this study, we investigate the hygroscopic properties of organic and organometallic polymeric particles, namely polycatechol, polyguaiacol, Fe-polyfumarte, and Fe-polymuconate. These particles efficiently form in iron-catalyzed reactions with aromatic and aliphatic dicarboxylic acid compounds detected in field-collected SOA. The structure of surface water was studied using diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and the uptake of gas water was quantified using quartz crystal microbalance (QCM) as a function of relative humidity. Spectroscopic data show that water bonding with organic functional groups acting as hydrogen bond acceptors causes shifts in their vibrational modes. Analysis of the hydroxyl group stretching region revealed weak and strong hydrogen bonding networks that suggest cluster formation reflecting water-water and water-organics interactions, respectively. A modified Type II multilayer Brunauer-Emmett-Teller adsorption model described the adsorption isotherm on the nonporous materials, polycatechol, polyguaiacol, and Fe-polymuconate. However, water adsorption on porous Fe-polyfumarate was best described using a Type V adsorption model, namely the Langmuir-Sips model that accounts for condensation in pores. The data revealed that organometallic polymers are more hygroscopic than organic polymers. The implications of these investigations are discussed in the context of the chemical reactivity of these particles relative to known SOA.
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19
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Panneer SVK, Ravva MK, Mishra BK, Subramanian V, Sathyamurthy N. Co-operativity in non-covalent interactions in ternary complexes: a comprehensive electronic structure theory based investigation. J Mol Model 2018; 24:258. [PMID: 30159795 DOI: 10.1007/s00894-018-3796-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2018] [Accepted: 08/14/2018] [Indexed: 11/24/2022]
Abstract
The structure and stability of various ternary complexes in which an extended aromatic system such as coronene interacts with ions/atoms/molecules on opposite faces of the π-electron cloud were investigated using ab initio calculations. By characterizing the nature of the intermolecular interactions using an energy decomposition analysis, it was shown that there is an interplay between various types of interactions and that there are co-operativity effects, particularly when different types of interactions coexist in the same system. Graphical abstract Weak OH-π, π-π and van der Waals-π ternary systems are stabilized through dispersion interactions. Cation-π ternary systems are stabilized by through-space electrostatic interactions.
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Affiliation(s)
| | | | | | - Venkatesan Subramanian
- Chemical Laboratory, CSIR-Central Leather Research Institute, Adyar, Chennai, 600020, India.
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20
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Choudhary A, Chandra A. Dynamics of water in conical solvation shells around a benzene solute under different thermodynamic conditions. Phys Chem Chem Phys 2018; 20:18328-18339. [PMID: 29938274 DOI: 10.1039/c7cp08109j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Water molecules in different parts of the anisotropic hydration shell of an aromatic molecule experience different interactions. In the present study, we investigate the anisotropic dynamics of water molecules in different non-overlapping conical shells around a benzene solute at sub- and supercritical conditions by means of molecular dynamics simulations using both non-polarizable and polarizable models. In addition to the dynamical properties, the effects of polarizability on the hydration structure of benzene at varying thermodynamic conditions are also investigated in the current study. The presence of πH-bonding in the solvation shell is found to be an important factor that influences the anisotropic dynamics of the benzene hydration shell. The water molecules located axial to the benzene plane are found to be maximally influenced by the πH-bonding. The extent of πH-bonding is found to be somewhat reduced on inclusion of polarizability. The πH-bonded water molecules are found to reorient through large-amplitude angular jumps where the jump-angle amplitude increases at higher temperatures and lower densities. For both non-polarizable and polarizable models, it is found that the water molecules in the axial conical shells possess faster orientational and hydrogen bond dynamics compared to those in the equatorial plane. Water molecules in the axial conical shells are also found to diffuse at a faster rate than bulk molecules due to the relatively weaker benzene-water πH-bonding interactions in the axial region of the hydration shell. The residence dynamics of water molecules in different conical solvation shells around the solute is also investigated in the current study.
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Affiliation(s)
- Ashu Choudhary
- Department of Chemistry, Indian Institute of Technology Kanpur, 208016, India.
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21
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Biswas S, Jana D, Kumar GS, Maji S, Kundu P, Ghorai UK, Giri RP, Das B, Chattopadhyay N, Ghorai BK, Acharya S. Supramolecular Aggregates of Tetraphenylethene-Cored AIEgen toward Mechanoluminescent and Electroluminescent Devices. ACS APPLIED MATERIALS & INTERFACES 2018; 10:17409-17418. [PMID: 29697251 DOI: 10.1021/acsami.8b00165] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Luminescent materials possessing both the mechanoluminescence (MCL) and electroluminescence (EL) properties are the quest for sensing and optoelectronic applications. We report on the synthesis of a new tailor-made luminogen, 1,2-bis(4-(1-([1,1'-biphenyl]-4-yl)-2,2-diphenylvinyl)phenyl)-1,2-diphenylethene (TPE 5), using Suzuki coupling reaction with high yield. An aggregation-induced emission (AIE) active complex TPE 5 forms supramolecular spherical aggregates at the air-water interface of a Langmuir trough. As a consequence, a large enhancement of luminescence is obtained from the mono- and multilayer Langmuir-Blodgett films of TPE 5 owing to the AIE effect. The luminogen TPE 5 exhibits a reversible MCL response, displaying photoluminescence switching due to change in the crystalline states under external stimuli. The unique feature of luminescence enhancement upon aggregate formation is utilized for the fabrication of light-emitting diodes with low threshold voltage using supramolecular aggregates as the active layer. This work demonstrates an efficient strategy for obtaining controlled supramolecular aggregates of AIEgen with a potential in the dual applications of MCL and EL.
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Affiliation(s)
| | - Debabrata Jana
- Department of Chemistry , Indian Institute of Engineering Science and Technology , Shibpur, Howrah 711103 , India
| | | | | | - Pronab Kundu
- Department of Chemistry , Jadavpur University , Kolkata 700032 , India
| | - Uttam K Ghorai
- Department of Industrial Chemistry and Applied Chemistry, Swami Vivekananda Research Centre , Ramakrishna Mission Vidyamandira , Belurmath, Howrah 711202 , India
| | - Rajendra P Giri
- Surface Physics and Material Science Division , Saha Institute of Nuclear Physics, HBNI , 1/AF, Bidhannagar , Kolkata 700064 , India
| | | | | | - Binay K Ghorai
- Department of Chemistry , Indian Institute of Engineering Science and Technology , Shibpur, Howrah 711103 , India
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22
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Kim S, Kaliszewski CM, Guidez EB, Gordon MS. Benchmarking the Effective Fragment Potential Dispersion Correction on the S22 Test Set. J Phys Chem A 2018; 122:4076-4084. [PMID: 29601202 DOI: 10.1021/acs.jpca.7b11628] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The usual modeling of dispersion interactions in density functional theory (DFT) is often limited by the use of empirically fitted parameters. In this study, the accuracies of the popular empirical dispersion corrections and the first-principles derived effective fragment potential (EFP) dispersion correction are compared by computing the DFT-D and HF-D equilibria interaction energies and intermolecular distances of the S22 test set dimers. Functionals based on the local density approximation (LDA) and generalized gradient approximation (GGA), as well as hybrid functionals, are compared for the DFT-D calculations using coupled cluster CCSD(T) at the complete basis set (CBS) limit as the reference method. In general, the HF-D(EFP) method provides accurate equilibrium dimerization energies and intermolecular distances for hydrogen-bonded systems compared to the CCSD(T)/CBS reference data without using any empirical parameters. For dispersion-dominant and mixed systems, the structures and interaction energies obtained with the B3LYP-D(EFP) method are similar to or better than those obtained with the other DFT-D and HF-D methods. Overall, the first-principles derived -D(EFP) correction presents a robust alternative to the empirical -D corrections when used with the B3LYP functional for dispersion-dominant and mixed systems or with Hartree-Fock for hydrogen-bonded systems.
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Affiliation(s)
| | | | - Emilie B Guidez
- Department of Chemistry , University of Colorado Denver , Denver , Colorado 80217 , United States
| | - Mark S Gordon
- Department of Chemistry and Ames Laboratory USDOE , Iowa State University , Ames , Iowa 50011 , United States
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23
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Xu P, Guidez EB, Bertoni C, Gordon MS. Perspective:Ab initioforce field methods derived from quantum mechanics. J Chem Phys 2018. [DOI: 10.1063/1.5009551] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Affiliation(s)
- Peng Xu
- Department of Chemistry and Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA
| | - Emilie B. Guidez
- Department of Chemistry, University of Colorado Denver, Denver, Colorado 80217, USA
| | - Colleen Bertoni
- Argonne Leadership Computing Facility, Argonne, Illinois 60439, USA
| | - Mark S. Gordon
- Department of Chemistry and Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA
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24
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Abstract
The dispersion energy term between quantum-mechanical (QM) and classical (represented by effective fragment potentials, EFP) subsystems is developed and implemented. A new formulation is based on long-range perturbation theory and uses dynamic polarizability tensors of the effective fragments and electric field integrals and orbital energies of the quantum-mechanical subsystem. No parametrization is involved. The accuracy of the QM-EFP dispersion energy is tested on a number of model systems; the average mean unsigned error is 0.8 kcal/mol or 13% with respect to the symmetry adapted perturbation theory on the S22 data set of noncovalent interactions. The computational cost of the dispersion energy computation is low compared to the self-consistent field calculation of the QM subsystem. The dispersion energy is sensitive to the level of theory employed for the QM part and to the electrostatic interactions in the system. The latter means that the dispersion interactions in the QM/EFP method are not purely two-body but have more complex many-body behavior.
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Affiliation(s)
- Lyudmila V Slipchenko
- Department of Chemistry, Purdue University , West Lafayette, Indiana 47907, United States
| | - Mark S Gordon
- Department of Chemistry and Ames Laboratory, Iowa State University , Ames, Iowa 50011, United States
| | - Klaus Ruedenberg
- Department of Chemistry and Ames Laboratory, Iowa State University , Ames, Iowa 50011, United States
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25
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Ashouri M, Karimi-Jafari MH, Maghari A. Micro-solvation of a bisphosphonate group: an ab initio and effective fragment potential analysis. Struct Chem 2017. [DOI: 10.1007/s11224-017-0925-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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26
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Dubinets N, Slipchenko LV. Effective Fragment Potential Method for H-Bonding: How To Obtain Parameters for Nonrigid Fragments. J Phys Chem A 2017; 121:5301-5312. [DOI: 10.1021/acs.jpca.7b01701] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nikita Dubinets
- Department
of Condensed Matter Physics, National Research Nuclear University “MEPhI”, 31 Kashirskoe Highway, Moscow, 115409, Russia
- Federal Research
Center “Crystallography and Photonics”, Photochemistry
Center RAS, 7a Novatorov Str., Moscow, 119421, Russia
| | - Lyudmila V. Slipchenko
- Department
of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
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27
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Liu C, Qi R, Wang Q, Piquemal JP, Ren P. Capturing Many-Body Interactions with Classical Dipole Induction Models. J Chem Theory Comput 2017; 13:2751-2761. [PMID: 28482664 PMCID: PMC5472369 DOI: 10.1021/acs.jctc.7b00225] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Indexed: 11/29/2022]
Abstract
The nonadditive many-body interactions are significant for structural and thermodynamic properties of condensed phase systems. In this work we examined the many-body interaction energy of a large number of common organic/biochemical molecular clusters, which consist of 18 chemical species and cover nine common organic elements, using the Møller-Plesset perturbation theory to the second order (MP2) [ Møller et al. Phys. Rev. 1934 , 46 , 618 . ]. We evaluated the capability of Thole-based dipole induction models to capture the many-body interaction energy. Three models were compared: the original model and parameters used by the AMOEBA force field, a variation of this original model where the damping parameters have been reoptimized to MP2 data, and a third model where the damping function form applied to the permanent electric field is modified. Overall, we find the simple classical atomic dipole models are able to capture the 3- and 4-body interaction energy across a wide variety of organic molecules in various intermolecular configurations. With modified Thole models, it is possible to further improve the agreement with MP2 results. These models were also tested on systems containing metal/halogen ions to examine the accuracy and transferability. This work suggests that the form of damping function applied to the permanent electrostatic field strongly affects the distance dependence of polarization energy at short intermolecular separations.
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Affiliation(s)
- Chengwen Liu
- Department
of Biomedical Engineering, The University
of Texas at Austin, Austin, Texas 78712, United States
| | - Rui Qi
- Department
of Biomedical Engineering, The University
of Texas at Austin, Austin, Texas 78712, United States
| | - Qiantao Wang
- Key
Laboratory of Drug Targeting and Drug Delivery System of Education
Ministry, West China School of Pharmacy, Sichuan University, Chengdu, Sichuan 610041, China
| | - J.-P. Piquemal
- Department
of Biomedical Engineering, The University
of Texas at Austin, Austin, Texas 78712, United States
- Laboratoire
de Chimie Théorique, Sorbonne Universités,
UPMC, UMR 7616 CNRS, Paris 75252, France
- Institut Universitaire
de France, Paris Cedex 05, 75231, France
| | - Pengyu Ren
- Department
of Biomedical Engineering, The University
of Texas at Austin, Austin, Texas 78712, United States
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28
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Iwamoto R, Kusanagi H, Harui R. Novel Hydrogen-Bonding Pattern of Water in Polycarbonate. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2017. [DOI: 10.1246/bcsj.20160394] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Reikichi Iwamoto
- NIRS Institute of Water, Yuyamadai 2-7-10 Kawanishi, Hyogo 666-0137
| | - Hiroshi Kusanagi
- NIRS Institute of Water, Yuyamadai 2-7-10 Kawanishi, Hyogo 666-0137
| | - Rika Harui
- Thermo Fischer Scientific Japan, DNX Shin-Osaka Bldg. 6-3-14 Nishi Nakajima, Yodogawa-ku, Osaka 532-0011
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29
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Ingenmey J, von Domaros M, Kirchner B. Predicting miscibility of binary liquids from small cluster QCE calculations. J Chem Phys 2017; 146:154502. [PMID: 28433040 DOI: 10.1063/1.4980032] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Affiliation(s)
- Johannes Ingenmey
- Mulliken Center for Theoretical Chemistry, Universität Bonn, Beringstr. 4, D-53115 Bonn, Germany
| | - Michael von Domaros
- Mulliken Center for Theoretical Chemistry, Universität Bonn, Beringstr. 4, D-53115 Bonn, Germany
| | - Barbara Kirchner
- Mulliken Center for Theoretical Chemistry, Universität Bonn, Beringstr. 4, D-53115 Bonn, Germany
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30
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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: 151] [Impact Index Per Article: 21.6] [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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31
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Ghosh D. Hybrid Equation-of-Motion Coupled-Cluster/Effective Fragment Potential Method: A Route toward Understanding Photoprocesses in the Condensed Phase. J Phys Chem A 2016; 121:741-752. [DOI: 10.1021/acs.jpca.6b08263] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Debashree Ghosh
- Physical
and Materials Chemistry
Division, CSIR-National Chemical Laboratory, Pune, India 411008
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32
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Sharma D, Sameera WMC, Andersson S, Nyman G, Paterson MJ. Computational Study of the Interactions between Benzene and Crystalline Ice Ih: Ground and Excited States. Chemphyschem 2016; 17:4079-4089. [DOI: 10.1002/cphc.201600660] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2016] [Indexed: 01/06/2023]
Affiliation(s)
- Divya Sharma
- Institute of Chemical Sciences; School of Engineering and Physical Sciences; Heriot Watt University Edinburgh EH14 4AS United Kingdom
| | - W. M. C. Sameera
- Fukui Institute for Fundamental Chemistry; Kyoto University; Kyoto 606-8103 Japan
- University of Gothenburg; Department of Chemistry and Molecular Biology; Kemigården 4 412 96 Gothenburg Sweden
| | - Stefan Andersson
- University of Gothenburg; Department of Chemistry and Molecular Biology; Kemigården 4 412 96 Gothenburg Sweden
- SINTEF Materials and Chemistry; P.O. Box 4760 7465 Trondheim Norway
| | - Gunnar Nyman
- University of Gothenburg; Department of Chemistry and Molecular Biology; Kemigården 4 412 96 Gothenburg Sweden
| | - Martin J. Paterson
- Institute of Chemical Sciences; School of Engineering and Physical Sciences; Heriot Watt University Edinburgh EH14 4AS United Kingdom
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33
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Tan SYS, Izgorodina EI. Comparison of the Effective Fragment Potential Method with Symmetry-Adapted Perturbation Theory in the Calculation of Intermolecular Energies for Ionic Liquids. J Chem Theory Comput 2016; 12:2553-68. [DOI: 10.1021/acs.jctc.6b00141] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Samuel Y. S. Tan
- School of Chemistry, Monash University, 17 Rainforest
Walk, Clayton, Victoria 3800, Australia
| | - Ekaterina I. Izgorodina
- School of Chemistry, Monash University, 17 Rainforest
Walk, Clayton, Victoria 3800, Australia
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34
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Marchione D, McCoustra MRS. Non-covalent interaction of benzene with methanol and diethyl ether solid surfaces. Phys Chem Chem Phys 2016; 18:20790-801. [DOI: 10.1039/c6cp01787h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
We have investigated the interactions involved at the interface of binary, layered ices (benzene on methanol and on diethyl ether) by means of laboratory experiments and ab initio calculations on model clusters.
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35
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Marchione D, Thrower JD, McCoustra MRS. Efficient electron-promoted desorption of benzene from water ice surfaces. Phys Chem Chem Phys 2016; 18:4026-34. [DOI: 10.1039/c5cp06537b] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
We study the desorption of benzene from solid water surfaces during irradiation of ultrathin solid films with low energy electrons.
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36
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Sánchez-Sanz G, Trujillo C, Alkorta I, Elguero J. Modulating intramolecular P⋯N pnictogen interactions. Phys Chem Chem Phys 2016; 18:9148-60. [DOI: 10.1039/c6cp00227g] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The strength of P⋯N intramolecular pnictogen interactions can be modulated, enhanced or diminished upon substitution of different electron withdrawing or donor groups.
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Affiliation(s)
| | - Cristina Trujillo
- School of Chemistry
- Trinity Biomedical Sciences Institute
- Trinity College Dublin
- Dublin 2
- Ireland
| | - Ibon Alkorta
- Instituto de Química Médica
- CSIC
- E-28006 Madrid
- Spain
| | - José Elguero
- Instituto de Química Médica
- CSIC
- E-28006 Madrid
- Spain
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37
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Tabor DP, Kusaka R, Walsh PS, Zwier TS, Sibert EL. Local Mode Approach to OH Stretch Spectra of Benzene–(H2O)n Clusters, n = 2–7. J Phys Chem A 2015; 119:9917-30. [PMID: 26340135 DOI: 10.1021/acs.jpca.5b06954] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daniel P. Tabor
- Department
of Chemistry and Theoretical Chemistry Institute, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
| | - Ryoji Kusaka
- Department
of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Patrick S. Walsh
- Department
of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Timothy S. Zwier
- Department
of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Edwin L. Sibert
- Department
of Chemistry and Theoretical Chemistry Institute, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
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38
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Tabor DP, Kusaka R, Walsh PS, Sibert EL, Zwier TS. Isomer-Specific Spectroscopy of Benzene-(H2O)n, n = 6,7: Benzene's Role in Reshaping Water's Three-Dimensional Networks. J Phys Chem Lett 2015; 6:1989-1995. [PMID: 26263279 DOI: 10.1021/acs.jpclett.5b00786] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The water hexamer and heptamer are the smallest sized water clusters that support three-dimensional hydrogen-bonded networks, with several competing structures that could be altered by interactions with a solute. Using infrared-ultraviolet double resonance spectroscopy, we record isomer-specific OH stretch infrared spectra of gas-phase benzene-(H2O)(6,7) clusters that demonstrate benzene's surprising role in reshaping (H2O)(6,7). The single observed isomer of benzene-(H2O)6 incorporates an inverted book structure rather than the cage or prism. The main conformer of benzene-(H2O)7 is an inserted-cubic structure in which benzene replaces one water molecule in the S4-symmetry cube of the water octamer, inserting itself into the water cluster by engaging as a π H-bond acceptor with one water and via C-H···O donor interactions with two others. The corresponding D(2d)-symmetry inserted-cube structure is not observed, consistent with the calculated energetic preference for the S4 over the D(2d) inserted cube. A reduced-dimension model that incorporates stretch-bend Fermi resonance accounts for the spectra in detail and sheds light on the hydrogen-bonding networks themselves and on the perturbations imposed on them by benzene.
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Affiliation(s)
- Daniel P Tabor
- †Department of Chemistry and Theoretical Chemistry Institute, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Ryoji Kusaka
- ‡Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084, United States
- §Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima, 739-8526, Japan
| | - Patrick S Walsh
- ‡Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084, United States
| | - Edwin L Sibert
- †Department of Chemistry and Theoretical Chemistry Institute, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Timothy S Zwier
- ‡Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084, United States
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39
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Palchowdhury S, Bhargava BL. Effect of spacer chain length on the liquid structure of aqueous dicationic ionic liquid solutions: molecular dynamics studies. Phys Chem Chem Phys 2015; 17:11627-37. [DOI: 10.1039/c5cp00873e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Cations in an aqueous [C16(MIm)2][2Br] solution aggregate spontaneously to form micelles, with a hydrophobic core composed of spacer alkyl chains and a hydrophilic surface composed of imidazolium head groups.
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Affiliation(s)
- Sourav Palchowdhury
- School of Chemical Sciences
- National Institute of Science Education & Research
- Bhubaneswar-751005
- India
| | - B. L. Bhargava
- School of Chemical Sciences
- National Institute of Science Education & Research
- Bhubaneswar-751005
- India
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40
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41
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Gadre SR, Yeole SD, Sahu N. Quantum chemical investigations on molecular clusters. Chem Rev 2014; 114:12132-73. [PMID: 25341561 DOI: 10.1021/cr4006632] [Citation(s) in RCA: 147] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Shridhar R Gadre
- Department of Chemistry, Indian Institute of Technology Kanpur , Kanpur 208 016, India
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42
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Janjić GV, Malkov SN, Zivković MV, Zarić SD. What are preferred water-aromatic interactions in proteins and crystal structures of small molecules? Phys Chem Chem Phys 2014; 16:23549-53. [PMID: 25271703 DOI: 10.1039/c4cp00929k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The distribution of water molecules around aromatic rings in the protein structures and crystal structures of small molecules shows quite a small number of the strongest OH-π interactions, a larger number of parallel interactions, and the largest number of the weakest CH-O interactions.
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Affiliation(s)
- Goran V Janjić
- Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, P.O. Box 473, Belgrade, Serbia
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43
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Vojislavljević-Vasilev DZ, Janjić GV, Medaković VB, Blagojević JP, Zarić SD. Parallel water/aromatic interactions of non-coordinated and coordinated water. Chemphyschem 2014; 15:2386-96. [PMID: 24840235 DOI: 10.1002/cphc.201402004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Revised: 03/19/2014] [Indexed: 11/07/2022]
Abstract
The parallel interactions of non-coordinated and coordinated water molecules with an aromatic ring were studied by analyzing data in the Cambridge structural database (CSD) and by using quantum chemical calculations. The CSD data show that water/aromatic contacts prefer parallel to OH/π interactions, which indicates the importance of parallel interactions. The results reveal the influence of water coordination to a metal ion; the interactions of aqua complexes are stronger. Coordinated water molecules prefer a parallel-down orientation in which one OH bond is parallel to the aromatic ring, whereas the other OH bond points to the plane of the ring. The interactions of aqua complexes with parallel-down water/benzene orientation are as strong as the much better known OH/π orientations. The strongest calculated interaction energy is -14.89 kcal mol(-1) . The large number of parallel contacts in crystal structures and the quite strong interactions indicate the importance of parallel orientation in water/benzene interactions.
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44
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Chibani S, Jacquemin D, Laurent AD. Modelling solvent effects on the absorption and emission spectra of constrained cyanines with both implicit and explicit QM/EFP models. COMPUT THEOR CHEM 2014. [DOI: 10.1016/j.comptc.2014.03.033] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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45
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Nguyen KA, Pachter R, Day PN. Density functional theory based generalized effective fragment potential method. J Chem Phys 2014; 140:244101. [PMID: 24985612 DOI: 10.1063/1.4883488] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
We present a generalized Kohn-Sham (KS) density functional theory (DFT) based effective fragment potential (EFP2-DFT) method for the treatment of solvent effects. Similar to the original Hartree-Fock (HF) based potential with fitted parameters for water (EFP1) and the generalized HF based potential (EFP2-HF), EFP2-DFT includes electrostatic, exchange-repulsion, polarization, and dispersion potentials, which are generated for a chosen DFT functional for a given isolated molecule. The method does not have fitted parameters, except for implicit parameters within a chosen functional and the dispersion correction to the potential. The electrostatic potential is modeled with a multipolar expansion at each atomic center and bond midpoint using Stone's distributed multipolar analysis. The exchange-repulsion potential between two fragments is composed of the overlap and kinetic energy integrals and the nondiagonal KS matrices in the localized molecular orbital basis. The polarization potential is derived from the static molecular polarizability. The dispersion potential includes the intermolecular D3 dispersion correction of Grimme et al. [J. Chem. Phys. 132, 154104 (2010)]. The potential generated from the CAMB3LYP functional has mean unsigned errors (MUEs) with respect to results from coupled cluster singles, doubles, and perturbative triples with a complete basis set limit (CCSD(T)/CBS) extrapolation, of 1.7, 2.2, 2.0, and 0.5 kcal/mol, for the S22, water-benzene clusters, water clusters, and n-alkane dimers benchmark sets, respectively. The corresponding EFP2-HF errors for the respective benchmarks are 2.41, 3.1, 1.8, and 2.5 kcal/mol. Thus, the new EFP2-DFT-D3 method with the CAMB3LYP functional provides comparable or improved results at lower computational cost and, therefore, extends the range of applicability of EFP2 to larger system sizes.
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Affiliation(s)
- Kiet A Nguyen
- Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio 45433, USA
| | - Ruth Pachter
- Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio 45433, USA
| | - Paul N Day
- Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio 45433, USA
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46
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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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47
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Koziol L, Kumar N, Wong SE, Lightstone FC. Molecular recognition of aromatic rings by flavin: electrostatics and dispersion determine ring positioning above isoalloxazine. J Phys Chem A 2013; 117:12946-52. [PMID: 24229368 DOI: 10.1021/jp407193c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Aromatic stacking interactions between isoalloxazine (ISA) of flavin and three prototypical aromatics (benzene, pyridine, chlorobenzene) were investigated using electronic structure calculations with Monte Carlo simulated annealing. The Effective Fragment Potential (EFP) method was used to locate the low-energy equilibrium configurations for the three dimer systems. These structures were further characterized through DFT (M06-2X) and MP2 calculations. One equilibrium configuration exists for ISA-benzene; characterizing the stacked dimer surface revealed a steep, single-welled potential that funnels benzene directly between rings II and III, positioning a substituent hydrogen adjacent to the redox-active N5. ISA-pyridine and ISA-chlorobenzene minimum-energy structures contain the aromatic ring in very similar position to that in ISA-benzene. However, the added rotational degree of freedom leads to two distinct binding motifs, having approximately antiparallel or parallel dipole moment alignment with ISA. The existence of the latter binding configuration was unexpected but is explained by the shape of the ISA electrostatic potential. Dispersion is the primary noncovalent interaction driving the positioning of aromatic rings above ISA, while electrostatics determine the orientation in dipole-containing substituted benzenes. The interplay of these interactions can be used to tune molecular recognition properties of synthetic redox cofactors, including positioning desired functional groups adjacent to the redox-active N5.
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Affiliation(s)
- Lucas Koziol
- Physical and Life Sciences Division, Lawrence Livermore National Laboratory , 7000 East Avenue, Livermore, California 94550, United States
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48
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Pruitt SR, Leang SS, Xu P, Fedorov DG, Gordon MS. Hexamers and witchamers: Which hex do you choose? COMPUT THEOR CHEM 2013. [DOI: 10.1016/j.comptc.2013.06.030] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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49
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Gordon MS, Smith QA, Xu P, Slipchenko LV. Accurate first principles model potentials for intermolecular interactions. Annu Rev Phys Chem 2013; 64:553-78. [PMID: 23561011 DOI: 10.1146/annurev-physchem-040412-110031] [Citation(s) in RCA: 133] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The general effective fragment potential (EFP) method provides model potentials for any molecule that is derived from first principles, with no empirically fitted parameters. The EFP method has been interfaced with most currently used ab initio single-reference and multireference quantum mechanics (QM) methods, ranging from Hartree-Fock and coupled cluster theory to multireference perturbation theory. The most recent innovations in the EFP model have been to make the computationally expensive charge transfer term much more efficient and to interface the general EFP dispersion and exchange repulsion interactions with QM methods. Following a summary of the method and its implementation in generally available computer programs, these most recent new developments are discussed.
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Affiliation(s)
- Mark S Gordon
- Department of Chemistry and Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA.
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50
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Green MC, Fedorov DG, Kitaura K, Francisco JS, Slipchenko LV. Open-shell pair interaction energy decomposition analysis (PIEDA): formulation and application to the hydrogen abstraction in tripeptides. J Chem Phys 2013; 138:074111. [PMID: 23445001 DOI: 10.1063/1.4790616] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
An open-shell extension of the pair interaction energy decomposition analysis (PIEDA) within the framework of the fragment molecular orbital (FMO) method is developed. The open-shell PIEDA method allows the analysis of inter- and intramolecular interactions in terms of electrostatic, exchange-repulsion, charge-transfer, dispersion, and optional polarization energies for molecular systems with a radical or high-spin fragment. Taking into account the low computational cost and scalability of the FMO and PIEDA methods, the new scheme provides a means to characterize the stabilization of radical and open-shell sites in biologically relevant species. The open-shell PIEDA is applied to the characterization of intramolecular interactions in capped trialanine upon hydrogen abstraction (HA) at various sites on the peptide. Hydrogen abstraction reaction is the first step in the oxidative pathway initiated by reactive oxygen or nitrogen species, associated with oxidative stress. It is found that HA results in significant geometrical reorganization of the trialanine peptide. Depending on the HA site, terminal interactions in the radical fold conformers may become weaker or stronger compared to the parent molecule, and often change the character of the non-covalent bonding from amide stacking to hydrogen bonding.
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Affiliation(s)
- Mandy C Green
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA
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