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Tang Z, Zhu H, Pan Z, Gao J, Zhang J. A many-body energy decomposition analysis (MB-EDA) scheme based on a target state optimization self-consistent field (TSO-SCF) method. Phys Chem Chem Phys 2024; 26:17549-17560. [PMID: 38884195 DOI: 10.1039/d4cp01259c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2024]
Abstract
In this paper, we combine an energy decomposition analysis (EDA) scheme with many-body expansion (MBE) to develop a MB-EDA method to study the cooperative and anti-cooperative effects in molecular cluster systems. Based on the target state optimization self-consistent field (TSO-SCF) method, the intermolecular interaction energy can be decomposed into five chemically meaningful terms, i.e., electrostatic, exchange, polarization, charge transfer and dispersion interaction energies. MB-EDA can decompose each of these terms in MBE. This MB-EDA has been applied to 3 different cluster systems: water clusters, ionic liquid clusters, and acetonitrile-methane clusters. This reveals that electrostatic, exchange, and dispersion interactions are highly pairwise additive in all systems. In water and ionic liquid clusters, the many-body effects are significant in both polarization and charge transfer interactions, but are cooperative and anti-cooperative, respectively. For acetonitrile-methane clusters, which do not involve hydrogen bonds or charge-charge Coulombic interactions, the many-body effects are quite small. The chemical origins of different many-body effects are deeply analyzed. The MB-EDA method has been implemented in Qbics (https://qbics.info) and can be a useful tool for understanding the many-body behavior in molecular aggregates at the quantum chemical level of theory.
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Affiliation(s)
- Zhen Tang
- Peking University Shenzhen Graduate School, Shenzhen, Guangdong 518055, People's Republic of China.
- Institute of Systems and Physical Biology, Shenzhen Bay Laboratory, Shenzhen, Guangdong 518055, People's Republic of China.
| | - Hong Zhu
- Peking University Shenzhen Graduate School, Shenzhen, Guangdong 518055, People's Republic of China.
- Institute of Systems and Physical Biology, Shenzhen Bay Laboratory, Shenzhen, Guangdong 518055, People's Republic of China.
| | - Zhijun Pan
- Institute of Systems and Physical Biology, Shenzhen Bay Laboratory, Shenzhen, Guangdong 518055, People's Republic of China.
| | - Jiali Gao
- Peking University Shenzhen Graduate School, Shenzhen, Guangdong 518055, People's Republic of China.
- Institute of Systems and Physical Biology, Shenzhen Bay Laboratory, Shenzhen, Guangdong 518055, People's Republic of China.
- Department of Chemistry and Supercomputing Institute, University of Minnesota, Minneapolis, MN 55455, USA
| | - Jun Zhang
- Institute of Systems and Physical Biology, Shenzhen Bay Laboratory, Shenzhen, Guangdong 518055, People's Republic of China.
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2
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Lüttschwager NOB. The strength of the OH-bend/OH-stretch Fermi resonance in small water clusters. Phys Chem Chem Phys 2024; 26:10120-10135. [PMID: 38487881 DOI: 10.1039/d3cp06255d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/28/2024]
Abstract
A novel Raman jet-spectrometer is used to study the Fermi resonance between the OH bending overtone and OH stretching fundamental in small cyclic water clusters (H2O)n with n = 3, 4, 5. The new setup features a recirculating vacuum system which reduces the gas consumption by 2 to 3 orders of magnitude and enables long-term measurements of very weak Raman signals. Raman spectra measured from highly diluted expansions with unprecedented signal-to-noise ratio are presented and cluster-specific intensity ratios and effective coupling constants are derived using Markov-Chain Monte-Carlo methods, yielding a high probability for an almost "perfect" resonance for the tetramer and pentamer, i.e. a close frequency match of bend overtone and stretch fundamental with intensity ratios close to 1, but a larger coupling constant for the trimer, with best estimates close to W5 ≲ 50 cm-1 < W4 ≲ 60 cm-1 < W3 ≈ 65 cm-1.
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Affiliation(s)
- Nils O B Lüttschwager
- Georg-August-Universität Göttingen, Institut für Physikalische Chemie, Tammannstraße 6, 37077 Göttingen, Germany.
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3
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Rock CA, Tschumper GS. Insight into the Binding of Argon to Cyclic Water Clusters from Symmetry-Adapted Perturbation Theory. Int J Mol Sci 2023; 24:17480. [PMID: 38139311 PMCID: PMC10744083 DOI: 10.3390/ijms242417480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 12/06/2023] [Accepted: 12/07/2023] [Indexed: 12/24/2023] Open
Abstract
This work systematically examines the interactions between a single argon atom and the edges and faces of cyclic H2O clusters containing three-five water molecules (Ar(H2O)n=3-5). Full geometry optimizations and subsequent harmonic vibrational frequency computations were performed using MP2 with a triple-ζ correlation consistent basis set augmented with diffuse functions on the heavy atoms (cc-pVTZ for H and aug-cc-pVTZ for O and Ar; denoted as haTZ). Optimized structures and harmonic vibrational frequencies were also obtained with the two-body-many-body (2b:Mb) and three-body-many-body (3b:Mb) techniques; here, high-level CCSD(T) computations capture up through the two-body or three-body contributions from the many-body expansion, respectively, while less demanding MP2 computations recover all higher-order contributions. Five unique stationary points have been identified in which Ar binds to the cyclic water trimer, along with four for (H2O)4 and three for (H2O)5. To the best of our knowledge, eleven of these twelve structures have been characterized here for the first time. Ar consistently binds more strongly to the faces than the edges of the cyclic (H2O)n clusters, by as much as a factor of two. The 3b:Mb electronic energies computed with the haTZ basis set indicate that Ar binds to the faces of the water clusters by at least 3 kJ mol-1 and by nearly 6 kJ mol-1 for one Ar(H2O)5 complex. An analysis of the interaction energies for the different binding motifs based on symmetry-adapted perturbation theory (SAPT) indicates that dispersion interactions are primarily responsible for the observed trends. The binding of a single Ar atom to a face of these cyclic water clusters can induce perturbations to the harmonic vibrational frequencies on the order of 5 cm-1 for some hydrogen-bonded OH stretching frequencies.
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Affiliation(s)
| | - Gregory S. Tschumper
- Department of Chemistry and Biochemistry, University of Mississippi, University, MS 38677-1848, USA
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4
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Zamith S, Kassem A, L'Hermite JM, Joblin C, Cuny J. Threshold collision induced dissociation of protonated water clusters. J Chem Phys 2023; 159:184302. [PMID: 37955320 DOI: 10.1063/5.0167551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Accepted: 10/19/2023] [Indexed: 11/14/2023] Open
Abstract
We report threshold collision induced dissociation experiments on protonated water clusters thermalized at low temperature for sizes n = 19-23. Fragmentation cross sections are recorded as a function of the collision energy and analyzed with a statistical model. This model allows us to account for dissociation cascades and provides values for the dissociation energies of each cluster. These values, averaging around 0.47 eV, are in good agreement with theoretical predictions at various levels of theory. Furthermore, the dissociation energies show a trend for the n = 21 magic and n = 22 anti-magic numbers relative to their neighbours, which is also in agreement with theory. These results provide further evidence to resolve the disagreement between previously published experimental values. A careful quantitative treatment of cascade dissociation in this model introduces interdependence between the dissociation energies of neighboring sizes, which reduces the number of free fitting parameters and improves both reliability and uncertainties on absolute dissociation energies deduced from experiments.
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Affiliation(s)
- Sébastien Zamith
- Laboratoire Collisions Agrégats Réactivité (LCAR/FERMI), UMR5589, Université Toulouse III - Paul Sabatier, CNRS, 118 Route de Narbonne, F-31062 Toulouse, France
| | - Ali Kassem
- Laboratoire Collisions Agrégats Réactivité (LCAR/FERMI), UMR5589, Université Toulouse III - Paul Sabatier, CNRS, 118 Route de Narbonne, F-31062 Toulouse, France
| | - Jean-Marc L'Hermite
- Laboratoire Collisions Agrégats Réactivité (LCAR/FERMI), UMR5589, Université Toulouse III - Paul Sabatier, CNRS, 118 Route de Narbonne, F-31062 Toulouse, France
| | - Christine Joblin
- Institut de Recherche en Astrophysique et Planétologie (IRAP), UMR5277, Université Toulouse III - Paul Sabatier, CNRS, CNES, 9 avenue du Colonel Roche, F-31028 Toulouse, France
| | - Jérôme Cuny
- Laboratoire de Chimie et Physique Quantiques LCPQ/FERMI, Université Toulouse III - Paul Sabatier, CNRS, 118 Route de Narbonne, F-31062 Toulouse, France
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5
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Focke K, Jacob CR. Coupled-Cluster Density-Based Many-Body Expansion. J Phys Chem A 2023; 127:9139-9148. [PMID: 37871170 PMCID: PMC10626589 DOI: 10.1021/acs.jpca.3c04591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 09/27/2023] [Accepted: 09/27/2023] [Indexed: 10/25/2023]
Abstract
While CCSD(T) is often considered the "gold standard" of computational chemistry, the scaling of its computational cost as N7 limits its applicability for large and complex molecular systems. In this work, we apply the density-based many-body expansion [ Int. J. Quantum Chem. 2020, 120, e26228] in combination with CCSD(T). The accuracy of this approach is assessed for neutral, protonated, and deprotonated water hexamers, as well as (H2O)16 and (H2O)17 clusters. For the neutral water clusters, we find that already with a density-based two-body expansion, we are able to approximate the supermolecular CCSD(T) energies within chemical accuracy (4 kJ/mol). This surpasses the accuracy that is achieved with a conventional, energy-based three-body expansion. We show that this accuracy can be maintained even when approximating the electron densities using Hartree-Fock instead of using coupled-cluster densities. The density-based many-body expansion thus offers a simple, resource-efficient, and highly parallelizable approach that makes CCSD(T)-quality calculations feasible where they would otherwise be prohibitively expensive.
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Affiliation(s)
- Kevin Focke
- Institute of Physical and
Theoretical Chemistry, Technische Universität
Braunschweig, Gaußstraße 17, 38106 Braunschweig, Germany
| | - Christoph R. Jacob
- Institute of Physical and
Theoretical Chemistry, Technische Universität
Braunschweig, Gaußstraße 17, 38106 Braunschweig, Germany
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6
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Olive LN, Dornshuld EV, Schaefer HF, Tschumper GS. Competition between Solvent···Solvent and Solvent···Solute Interactions in the Microhydration of the Tetrafluoroborate Anion, BF 4-(H 2O) n=1,2,3,4. J Phys Chem A 2023; 127:8806-8820. [PMID: 37774368 DOI: 10.1021/acs.jpca.3c04014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/01/2023]
Abstract
This study systematically examines the interactions of the tetrafluoroborate anion (BF4-) with up to four water molecules (BF4-(H2O)n=1,2,3,4). Full geometry optimizations and subsequent harmonic vibrational frequency computations are performed using a variety of density functional theory (DFT) methods (B3LYP, B3LYP-D3BJ, and M06-2X) and the MP2 ab initio method with a triple-ζ correlation consistent basis set augmented with diffuse functions on all non-hydrogen atoms (cc-pVTZ for H and aug-cc-pVTZ for B, O, and F; denoted as haTZ). Optimized structures and harmonic vibrational frequencies were also obtained with the CCSD(T) ab initio method and the haTZ basis set for the mono- and dihydrate (n = 1, 2) structures. The 2-body:Many-body (2b:Mb) technique, in which CCSD(T) computations capture the 1- and 2-body contributions to the interactions and MP2 computations recover all higher-order contributions, was used to extend these demanding computations to the tri- and tetrahydrate (n = 3, 4) systems. Four, five, and eight new stationary points have been identified for the di-, tri-, and tetrahydrate systems, respectively. The global minimum of the monohydrate adopts a symmetric double ionic hydrogen bond motif with C2v symmetry and an electronic dissociation energy of 13.17 kcal mol-1 at the CCSD(T)/haTZ level of theory. This strong solvent···solute interaction, however, competes with solute···solute interactions in the lowest-energy BF4-(H2O)n=2,3,4 minima that are not seen in the other di-, tri-, or tetrahydrate minima. The latter interactions help increase the 2b:Mb dissociation energies to more than 26, 41, and 51 kcal mol-1 for n = 2, 3, and 4, respectively. Structures that form hydrogen bonds between the solvating water molecules also exhibit the largest shifts in the harmonic OH stretching frequencies for the waters of hydration. These shifts can exceed -280 cm-1 relative to an isolated H2O molecule at the 2b:Mb/haTZ level of theory.
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Affiliation(s)
- Laura N Olive
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Eric V Dornshuld
- Department of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, United States
| | - Henry F Schaefer
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Gregory S Tschumper
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677, United States
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7
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Liang J, Feng X, Liu X, Head-Gordon M. Analytical harmonic vibrational frequencies with VV10-containing density functionals: Theory, efficient implementation, and benchmark assessments. J Chem Phys 2023; 158:204109. [PMID: 37218699 PMCID: PMC10208678 DOI: 10.1063/5.0152838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2023] [Accepted: 04/27/2023] [Indexed: 05/24/2023] Open
Abstract
VV10 is a powerful nonlocal density functional for long-range correlation that is used to include dispersion effects in many modern density functionals, such as the meta-generalized gradient approximation (mGGA), B97M-V, the hybrid GGA, ωB97X-V, and the hybrid mGGA, ωB97M-V. While energies and analytical gradients for VV10 are already widely available, this study reports the first derivation and efficient implementation of the analytical second derivatives of the VV10 energy. The additional compute cost of the VV10 contributions to analytical frequencies is shown to be small in all but the smallest basis sets for recommended grid sizes. This study also reports the assessment of VV10-containing functionals for predicting harmonic frequencies using the analytical second derivative code. The contribution of VV10 to simulating harmonic frequencies is shown to be small for small molecules but important for systems where weak interactions are important, such as water clusters. In the latter cases, B97M-V, ωB97M-V, and ωB97X-V perform very well. The convergence of frequencies with respect to the grid size and atomic orbital basis set size is studied, and recommendations are reported. Finally, scaling factors to allow comparison of scaled harmonic frequencies with experimental fundamental frequencies and to predict zero-point vibrational energy are presented for some recently developed functionals (including r2SCAN, B97M-V, ωB97X-V, M06-SX, and ωB97M-V).
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Affiliation(s)
- Jiashu Liang
- Kenneth S. Pitzer Center for Theoretical Chemistry, Department of Chemistry, University of California at Berkeley, Berkeley, California 94720, USA
| | | | - Xiao Liu
- Kenneth S. Pitzer Center for Theoretical Chemistry, Department of Chemistry, University of California at Berkeley, Berkeley, California 94720, USA
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8
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Seijas LE, Zambrano CH, Almeida R, Alí-Torres J, Rincón L, Torres FJ. Exploring the Non-Covalent Bonding in Water Clusters. Int J Mol Sci 2023; 24:ijms24065271. [PMID: 36982342 PMCID: PMC10049637 DOI: 10.3390/ijms24065271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 02/13/2023] [Accepted: 02/16/2023] [Indexed: 03/12/2023] Open
Abstract
QTAIM and source function analysis were used to explore the non-covalent bonding in twelve different water clusters (H2O)n obtained by considering n = 2–7 and various geometrical arrangements. A total of seventy-seven O−H⋯O hydrogen bonds (HBs) were identified in the systems under consideration, and the examination of the electron density at the bond critical point (BCP) of these HBs revealed the existence of a great diversity of O−H⋯O interactions. Furthermore, the analysis of quantities, such as |V(r)|/G(r) and H(r), allowed a further description of the nature of analogous O−H⋯O interactions within each cluster. In the case of 2-D cyclic clusters, the HBs are nearly equivalent between them. However, significant differences among the O−H⋯O interactions were observed in 3-D clusters. The assessment of the source function (SF) confirmed these findings. Finally, the ability of SF to decompose the electron density (ρ) into atomic contributions allowed the evaluation of the localized or delocalized character of these contributions to ρ at the BCP associated to the different HBs, revealing that weak O−H⋯O interactions have a significant spread of the atomic contributions, whereas strong interactions have more localized atomic contributions. These observations suggest that the nature of the O−H⋯O hydrogen bond in water clusters is determined by the inductive effects originated by the different spatial arrangements of the water molecules in the studied clusters.
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Affiliation(s)
- Luis E. Seijas
- Grupo de Química Computacional y Teórica (QCT-UR), Escuela de Ingeniería Ciencia y Tecnología (EICT), Universidad del Rosario, Bogotá 111221, Colombia
| | - Cesar H. Zambrano
- Grupo de Química Computacional y Teórica (QCT-USFQ), Departamento de Ingeniería Química, Universidad San Francisco de Quito, Diego de Robles y Vía Interoceánica, Quito 17-1200-841, Ecuador
| | - Rafael Almeida
- Laboratorio de Procesos Dinámicos en Química, Departamento de Química, Facultad de Ciencias, Universidad de Los Andes, Mérida 5101, Venezuela
| | - Jorge Alí-Torres
- Departamento de Química, Universidad Nacional de Colombia, Av. Cra. 30 #45-03, Bogotá 111321, Colombia
| | - Luis Rincón
- Grupo de Química Computacional y Teórica (QCT-USFQ), Departamento de Ingeniería Química, Universidad San Francisco de Quito, Diego de Robles y Vía Interoceánica, Quito 17-1200-841, Ecuador
| | - Fernando Javier Torres
- Grupo de Química Computacional y Teórica (QCT-UR), Escuela de Ingeniería Ciencia y Tecnología (EICT), Universidad del Rosario, Bogotá 111221, Colombia
- Grupo de Química Computacional y Teórica (QCT-USFQ), Departamento de Ingeniería Química, Universidad San Francisco de Quito, Diego de Robles y Vía Interoceánica, Quito 17-1200-841, Ecuador
- Correspondence:
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9
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Jónsson EÖ, Rasti S, Galynska M, Meyer J, Jónsson H. Transferable Potential Function for Flexible H 2O Molecules Based on the Single-Center Multipole Expansion. J Chem Theory Comput 2022; 18:7528-7543. [PMID: 36395502 DOI: 10.1021/acs.jctc.2c00598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A potential function is presented for describing a system of flexible H2O molecules based on the single-center multipole expansion (SCME) of the electrostatic interaction. The model, referred to as SCME/f, includes the variation of the molecular quadrupole moment as well as the dipole moment with changes in bond length and angle so as to reproduce results of high-level electronic structure calculations. The multipole expansion also includes fixed octupole and hexadecapole moments, as well as anisotropic dipole-dipole, dipole-quadrupole, and quadrupole-quadrupole polarizability tensors. The model contains five adjustable parameters related to the repulsive interaction and damping functions in the electrostatic and dispersion interactions. Their values are adjusted to reproduce the lowest energy isomers of small clusters, (H2O)n with n = 2-6, as well as measured properties of the ice Ih crystal. Subsequent calculations of the energy difference between the various isomer configurations of the clusters show that SCME/f gives good agreement with results of electronic structure calculations and represents a significant improvement over the previously presented rigid SCME potential function. Analysis of the vibrational frequencies of the clusters and structural properties of ice Ih crystal show the importance of accurately describing the variation of the quadrupole moment with molecular structures.
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Affiliation(s)
- Elvar Örn Jónsson
- Science Institute and Faculty of Physical Sciences, University of Iceland, VR-III, 107Reykjavík, Iceland
| | - Soroush Rasti
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, 2300 RALeiden, The Netherlands
| | - Marta Galynska
- Science Institute and Faculty of Physical Sciences, University of Iceland, VR-III, 107Reykjavík, Iceland
| | - Jörg Meyer
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, 2300 RALeiden, The Netherlands
| | - Hannes Jónsson
- Science Institute and Faculty of Physical Sciences, University of Iceland, VR-III, 107Reykjavík, Iceland
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10
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Structures and spectroscopic properties of K+(H2O)n with n = 1–10 clusters based on density functional theory. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Czernek J, Brus J, Czerneková V. A computational inspection of the dissociation energy of mid-sized organic dimers. J Chem Phys 2022; 156:204303. [DOI: 10.1063/5.0093557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The gas-phase value of the dissociation energy ( D0) is a key parameter employed in both experimental and theoretical descriptions of noncovalent complexes. The D0 data were obtained for a set of mid-sized organic dimers in their global minima which was located using geometry optimizations that applied ample basis sets together with either the conventional second-order Møller–Plesset (MP2) method or several dispersion-corrected density-functional theory (DFT-D) schemes. The harmonic vibrational zero-point (VZP) and deformation energies from the MP2 calculations were combined with electronic energies from the coupled cluster theory with singles, doubles, and iterative triples [CCSD(T)] extrapolated to the complete basis set (CBS) limit to estimate D0 with the aim of inspecting values that were most recently measured, and an analogous comparison was performed using the DFT-D data. In at least one case (namely, for the aniline⋯methane cluster), the D0 estimate that employed the CCSD(T)/CBS energies differed from experiment in the way that could not be explained by a possible deficiency in the VZP contribution. Curiously, one of the DFT-D schemes (namely, the B3LYP-D3/def2-QZVPPD) was able to reproduce all measured D0 values to within 1.0 kJ/mol from experimental error bars. These findings show the need for further measurements and computations of some of the complexes. In order to facilitate such studies, the physical nature of intermolecular interactions in the investigated dimers was analyzed by means of the DFT-based symmetry-adapted perturbation theory.
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Affiliation(s)
- Jiří Czernek
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovsky Square 2, 162 06 Praha 6, The Czech Republic
| | - Jiří Brus
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovsky Square 2, 162 06 Praha 6, The Czech Republic
| | - Vladimíra Czerneková
- Institute of Physics, Czech Academy of Sciences, Na Slovance 2, 182 21 Praha 8, The Czech Republic
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12
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Bridging H2O and H2S homomeric clusters via H2O-H2S mixed clusters: Impact of the changing ratio of H2O and H2S moieties. COMPUT THEOR CHEM 2022. [DOI: 10.1016/j.comptc.2022.113740] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Acid-based analogs of certain water tetramers: an examination of some crystal structures in the literature. Struct Chem 2022. [DOI: 10.1007/s11224-022-01924-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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14
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Li X, Panetier JA. Mechanistic Study of Tungsten Bipyridyl Tetracarbonyl Electrocatalysts for CO 2 Fixation: Exploring the Roles of Explicit Proton Sources and Substituent Effects. Top Catal 2022; 65:325-340. [PMID: 37645456 PMCID: PMC10465121 DOI: 10.1007/s11244-021-01529-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/02/2021] [Indexed: 10/19/2022]
Abstract
Tungsten bipyridyl tetracarbonyl complexes were shown to reduce CO2 to CO in acetonitrile [Chem. Sci., 2014, 5, 1894-1900]. Here, we employ density functional theory (DFT) calculations to investigate the electronic structure and reactivity of a series of tungsten electrocatalysts, [W(bpy-R)(CO)4] (where R = H, CH3, tBu, OCH3, CF3, and CN), for the CO2 reduction reaction (CO2RR). Our proposed mechanism suggests that initial reduction of the starting material by two electrons is required to access the active catalyst upon CO dissociation, which is slightly endergonic, consistent with the slow product release observed experimentally. The doubly reduced species, which has a closed-shell singlet ground state, can bind CO2 via an η2-CO2 binding mode to yield the metallocarboxylate intermediate. Based on the energy span model, CO2 addition is the TOF-determining transition state (TDTS) in the presence of water as the proton source. Different substituents at the 4,4'-positions of the bipyridine ligand in [W(bpy-R)(CO)4] (R = H, CH3, tBu, OCH3, CF3, and CN) were considered to comprehend the substituent effects for CO2RR. DFT results show that electron-withdrawing substituents, such as CN and CF3, do not yield efficient CO2 reduction catalysts due to the necessity of forming high energy intermediates for the protonation steps, resulting in low TOFs and high overpotentials. Among electron-donating groups, the parent compound and tert-butyl substituted complex are the most active catalysts for CO2RR due to higher TOFs at low overpotentials. Overall, based on the energy span model and theoretical Tafel plots, our computational approach provides quantitative information for designing CO2 reduction electrocatalysts.
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Affiliation(s)
- Xiaohui Li
- Department of Chemistry, State University of New York at Binghamton, Binghamton, NY 13902, USA
| | - Julien A. Panetier
- Department of Chemistry, State University of New York at Binghamton, Binghamton, NY 13902, USA
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15
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Rath G, Kopp WA, Leonhard K. Coupled Anharmonic Thermochemistry from Stratified Monte Carlo Integration. J Chem Inf Model 2021; 61:5853-5870. [PMID: 34874733 DOI: 10.1021/acs.jcim.1c00668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This study presents configuration integral Monte Carlo integration (CIMCI), a new semiclassical method for handling fully coupled anharmonicity in gas-phase thermodynamics that promises to be black boxable, to be applicable to all kinds of anharmonicity, and to scale better at higher dimensionality than other methods for handling gas-phase molecular anharmonicity. The method does so using automatically and recursively stratified, simultaneous Monte Carlo (MC) integration of multiple functions, following a modified version of the standard MISER scheme that converges at a rate of about the square of naïve MC integration. For the small systems analyzed by this study where proper reference data is available (H2O and H2O2), the method's anharmonic entropy corrections match reference data better than those of other black box anharmonic methods, e.g., vibrational perturbation theory (VPT2) and the McClurg hindered rotor model used with automatic detection of rotors; for H2O2 and NH2OH, the method is also in general agreement with one-dimensional hindered rotor treatments at low temperatures. This holds even when sampling with CIMCI is done with primitive force fields, e.g., UFF, while the competing methods are used with proper, comprehensive potentials, e.g., the M06-2X metahybrid density-functional theory (DFT) functional.
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Affiliation(s)
- Gabriel Rath
- Institute of Technical Thermodynamics, RWTH Aachen University, 52062 Aachen, Germany.,Software for Chemistry & Materials, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Wassja A Kopp
- Institute of Technical Thermodynamics, RWTH Aachen University, 52062 Aachen, Germany
| | - Kai Leonhard
- Institute of Technical Thermodynamics, RWTH Aachen University, 52062 Aachen, Germany
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16
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Nandi A, Qu C, Houston PL, Conte R, Yu Q, Bowman JM. A CCSD(T)-Based 4-Body Potential for Water. J Phys Chem Lett 2021; 12:10318-10324. [PMID: 34662138 DOI: 10.1021/acs.jpclett.1c03152] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
High-level, ab initio calculations find that the 4-body (4-b) interaction is needed to account for near-100% of the total interaction energy for water clusters as large as the 21-mer. Motivated by this, we report a permutationally invariant polynomial potential energy surface (PES) for the 4-body interaction. This machine-learned PES is a fit to 2119 symmetry-unique, CCSD(T)-F12a/haTZ 4-b interaction energies. Configurations for these come from tetramer direct-dynamics calculations, fragments from an MD water simulation at 300 K, and tetramer fragments in a variety of water clusters. The PIP basis is purified to ensure that the PES goes rigorously to zero in monomer+trimer and dimer+dimer dissociations. The 4-b energies of isomers of the hexamer calculated with the new PES are shown to be in better agreement with benchmark CCSD(T) results than those from the MB-pol potential. Tests on larger clusters further validate the high-fidelity of the PES. The PES is shown to be fast to evaluate, taking 2.4 s for 105 evaluations on a single core of 2.4 GHz Intel Xeon processor, and significantly faster using a parallel version of the PES.
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Affiliation(s)
- Apurba Nandi
- Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, United States
| | - Chen Qu
- Department of Chemistry & Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Paul L Houston
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
- Department of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Riccardo Conte
- Dipartimento di Chimica, Università Degli Studi di Milano, via Golgi 19, 20133 Milano, Italy
| | - Qi Yu
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Joel M Bowman
- Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, United States
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17
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Anharmonicity modeling in hydrogen bonded solvent dimers. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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18
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Monu, Oram BK, Bandyopadhyay B. A unified cost-effective method for the construction of reliable potential energy surfaces for H 2S and H 2O clusters. Phys Chem Chem Phys 2021; 23:18044-18057. [PMID: 34387290 DOI: 10.1039/d1cp01544c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A DFT-based methodology has been used to construct the potential energy surface of H2S clusters up to pentamers. Geometrical parameters and energetics show very good agreement with the existing experimental and high-level theoretical results. Distinct stable conformers of three dimers, six trimers, eleven tetramers and twenty-three pentamers have been identified. Both S-HS H-bond and SS interactions are identified in dimers, trimers and pentamers, while no SS interactions could be found in any of the 11 tetramer conformers. The binding energies of the most stable dimer, trimer, tetramer and pentamer are -1.66, -5.21, -8.57 and -12.54 kcal mol-1, respectively. The PES has been found to be exceedingly flat and the energy gap between the most and the least stable conformers was found to be only 0.09, 2.13, 1.65 and 1.13 kcal mol-1, from the dimer to the pentamer, respectively. The proposed method has also been used for water clusters up to the pentamer. The results obtained were found to agree closely with the existing results. Only one conformer was found for the water dimer, whereas four, five and fifteen conformers were obtained for the trimer, tetramer and pentamer, respectively. Atoms in molecular calculations were found to corroborate with the geometric and energetic results for both clusters.
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Affiliation(s)
- Monu
- Department of Chemistry, Malaviya National Institute of Technology Jaipur, JLN Marg, Jaipur - 302017, India.
| | - Binod Kumar Oram
- Department of Chemistry, Malaviya National Institute of Technology Jaipur, JLN Marg, Jaipur - 302017, India.
| | - Biman Bandyopadhyay
- Department of Chemistry, Malaviya National Institute of Technology Jaipur, JLN Marg, Jaipur - 302017, India.
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19
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Malloum A, Conradie J. Hydrogen bond networks of ammonia clusters: What we know and what we don’t know. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116199] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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20
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Schmitt-Monreal D, Jacob CR. Density-Based Many-Body Expansion as an Efficient and Accurate Quantum-Chemical Fragmentation Method: Application to Water Clusters. J Chem Theory Comput 2021; 17:4144-4156. [PMID: 34196558 DOI: 10.1021/acs.jctc.1c00340] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Fragmentation methods based on the many-body expansion offer an attractive approach for the quantum-chemical treatment of large molecular systems, such as molecular clusters and crystals. Conventionally, the many-body expansion is performed for the total energy, but such an energy-based many-body expansion often suffers from a slow convergence with respect to the expansion order. For systems that show strong polarization effects such as water clusters, this can render the energy-based many-body expansion infeasible. Here, we establish a density-based many-body expansion as a promising alternative approach. By performing the many-body expansion for the electron density instead of the total energy and inserting the resulting total electron density into the total energy functional of density functional theory, one can derive a density-based energy correction, which in principle accounts for all higher-order polarization effects. Here, we systematically assess the accuracy of such a density-based many-body expansion for test sets of water clusters. We show that already a density-based two-body expansion is able to reproduce interaction energies per fragment within chemical accuracy and is able to accurately predict the energetic ordering as well as the relative interaction energies of different isomers of water clusters.
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Affiliation(s)
- Daniel Schmitt-Monreal
- Institute of Physical and Theoretical Chemistry, Technische Universität Braunschweig, Gaußstr. 17, 38106 Braunschweig, Germany
| | - Christoph R Jacob
- Institute of Physical and Theoretical Chemistry, Technische Universität Braunschweig, Gaußstr. 17, 38106 Braunschweig, Germany
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21
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Lambros E, Hu J, Paesani F. Assessing the Accuracy of the SCAN Functional for Water through a Many-Body Analysis of the Adiabatic Connection Formula. J Chem Theory Comput 2021; 17:3739-3749. [DOI: 10.1021/acs.jctc.1c00141] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Eleftherios Lambros
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United States
| | - Jie Hu
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United States
| | - Francesco Paesani
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United States
- Materials Science and Engineering, University of California San Diego, La Jolla, California 92093, United States
- San Diego Supercomputer Center, University of California San Diego, La Jolla, California 92093, United States
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22
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Samala N, Agmon N. Temperature and Nuclear Quantum Effects on the Stretching Modes of the Water Hexamer. J Phys Chem A 2020; 124:8201-8208. [PMID: 32870682 PMCID: PMC7586398 DOI: 10.1021/acs.jpca.0c05557] [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: 06/18/2020] [Revised: 09/01/2020] [Indexed: 11/30/2022]
Abstract
The water hexamer has many low-lying isomers, e.g., ring, book, cage, and prism, shifting from two- to three-dimensional structures. We show that this dimensionality change is accompanied by a drop in the quantum nature of the cluster, as manifested in the red shift of the quantal OH stretching modes as compared with their classical counterparts. We obtain this "nuclear quantum effect" (NQE) as the mean deviation between the OH stretch frequencies from velocity autocorrelation Fourier transforms from classical trajectories on a high-level water potential (MB-pol) as compared with scaled harmonic frequencies from high-level quantum chemistry calculations. With a universal scaling factor, the predicted OH frequencies agree with experiment to a mean absolute deviation ≤10 cm-1, which allows unequivocal isomer assignments. By assuming temperature-independent NQEs, we produce the temperature dependence of the cage isomer OH stretch spectrum below 70 K, where it is the dominant structure. All bands widen and blue-shift with increasing temperature, most conspicuously the reddest mode, which thus constitutes a "vibrational thermometer".
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Affiliation(s)
- Nagaprasad
Reddy Samala
- The Fritz Haber Research
Center, Institute of Chemistry, The Hebrew
University of Jerusalem, Jerusalem 9190401, Israel
| | - Noam Agmon
- The Fritz Haber Research
Center, Institute of Chemistry, The Hebrew
University of Jerusalem, Jerusalem 9190401, Israel
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23
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Lambros E, Paesani F. How good are polarizable and flexible models for water: Insights from a many-body perspective. J Chem Phys 2020; 153:060901. [DOI: 10.1063/5.0017590] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Affiliation(s)
- Eleftherios Lambros
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, USA
| | - Francesco Paesani
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, USA
- Materials Science and Engineering, University of California San Diego, La Jolla, California 92093, USA
- San Diego Supercomputer Center, University of California San Diego, La Jolla, California 92093, USA
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24
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Jana S, Constantin LA, Samal P. Accurate Water Properties from an Efficient ab Initio Method. J Chem Theory Comput 2020; 16:974-987. [DOI: 10.1021/acs.jctc.9b01018] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Subrata Jana
- School of Physical Sciences, National Institute of Science Education and Research, HBNI, Bhubaneswar 752050, India
| | - Lucian A. Constantin
- Center for Biomolecular Nanotechnologies @UNILE, Istituto Italiano di Tecnologia, Via Barsanti, I-73010 Arnesano, Italy
| | - Prasanjit Samal
- School of Physical Sciences, National Institute of Science Education and Research, HBNI, Bhubaneswar 752050, India
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25
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Lacroix MR, Liu Y, Strauss SH. Room-Temperature FTIR Spectra of the Cyclic S4 (H 2O) 4 Cluster in Crystalline Li 2(H 2O) 4(B 12F 12): Observation of B and E ν(OH) Bands and Coupling of Strong O–H···O and Weak O–H···F Vibrations. J Phys Chem A 2019; 123:9781-9790. [DOI: 10.1021/acs.jpca.9b07628] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matthew R. Lacroix
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Yong Liu
- Department of Chemistry, University of Colorado at Denver, Denver, Colorado 80217, United States
| | - Steven H. Strauss
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
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26
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Samala NR, Agmon N. Temperature Dependence of Intramolecular Vibrational Bands in Small Water Clusters. J Phys Chem B 2019; 123:9428-9442. [PMID: 31553613 DOI: 10.1021/acs.jpcb.9b07777] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Cyclic water clusters are pivotal for understanding atmospheric reactions as well as liquid water, yet the temperature (T) dependence of their dynamics and spectroscopy is poorly studied. The development of highly accurate water potentials, such as MB-pol, partly rectifies this. It remains to account for the quantum nuclear effects (NQE), because quantum nuclear dynamics become increasingly inaccurate at low temperatures. From a practical point of view, we find that NQE can be accounted for simply by subtracting a constant from the frequencies obtained from the velocity autocorrelation functions (VACF) of classical nuclear dynamics, resulting in unprecedented agreement with experiment, mostly within 5 cm-1. We have performed classical simulations of (H2O)n clusters (n = 2-5) from 20 K and up to their melting temperature, calculating both all-atom and partial VACF, thus generating the temperature dependence of the vibrational frequencies (IR and Raman bands). Focusing on the hydrogen-bonded (HBed) OH stretch and HOH bend, we find opposing T dependencies. The HBed OH modes blue shift linearly with T, attributed to ring expansion rather than any specific conformational change. The lowest-frequency Raman concerted mode is predicted to show the largest such shift. In contrast, the HOH bend undergoes a red-shift, with the highest frequency concerted band undergoing the largest red-shift. These results can be explained by a coupled-oscillator model for n hydrogen atoms on a ring, constrained to move either tangentially (stretch) or perpendicularly (bend) to the ring. With increasing temperature and weakening of HBs, the intrinsic force constant increases (stretch) or remains constant (bend), while the nearest-neighbor coupling constant decreases, and this results in the interesting behavior revealed herein. T-dependent Raman studies are required for testing some of these predictions.
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Affiliation(s)
- Nagaprasad Reddy Samala
- The Fritz Haber Research Center, Institute of Chemistry , The Hebrew University of Jerusalem , Jerusalem 91904 , Israel
| | - Noam Agmon
- The Fritz Haber Research Center, Institute of Chemistry , The Hebrew University of Jerusalem , Jerusalem 91904 , Israel
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27
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Oliveira VP, Kraka E, Machado FBC. Pushing 3c–4e Bonds to the Limit: A Coupled Cluster Study of Stepwise Fluorination of First-Row Atoms. Inorg Chem 2019; 58:14777-14789. [DOI: 10.1021/acs.inorgchem.9b02458] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Vytor P. Oliveira
- Instituto Tecnológico de Aeronáutica (ITA), Departamento de Química, São José dos Campos, 12228-900 São Paulo, Brazil
| | - Elfi Kraka
- Department of Chemistry, Southern Methodist University, 3215 Daniel Avenue, Dallas, Texas 75275-0314, United States
| | - Francisco B. C. Machado
- Instituto Tecnológico de Aeronáutica (ITA), Departamento de Química, São José dos Campos, 12228-900 São Paulo, Brazil
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28
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Performance of polarization-consistent vs. correlation-consistent basis sets for CCSD(T) prediction of water dimer interaction energy. J Mol Model 2019; 25:313. [DOI: 10.1007/s00894-019-4200-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2019] [Accepted: 08/30/2019] [Indexed: 10/26/2022]
Abstract
Abstract
Detailed study of Jensen’s polarization-consistent vs. Dunning’s correlation-consistent basis set families performance on the extrapolation of raw and counterpoise-corrected interaction energies of water dimer using coupled cluster with single, double, and perturbative correction for connected triple excitations (CCSD(T)) in the complete basis set (CBS) limit are reported. Both 3-parameter exponential and 2-parameter inverse-power fits vs. the cardinal number of basis set, as well as the number of basis functions were analyzed and compared with one of the most extensive CCSD(T) results reported recently. The obtained results for both Jensen- and Dunning-type basis sets underestimate raw interaction energy by less than 0.136 kcal/mol with respect to the reference value of − 4.98065 kcal/mol. The use of counterpoise correction further improves (closer to the reference value) interaction energy. Asymptotic convergence of 3-parameter fitted interaction energy with respect to both cardinal number of basis set and the number of basis functions are closer to the reference value at the CBS limit than other fitting approaches considered here. Separate fits of Hartree-Fock and correlation interaction energy with 3-parameter formula additionally improved the results, and the smallest CBS deviation from the reference value is about 0.001 kcal/mol (underestimated) for CCSD(T)/aug-cc-pVXZ calculations. However, Jensen’s basis set underestimates such value to 0.012 kcal/mol. No improvement was observed for using the number of basis functions instead of cardinal number for fitting.
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29
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Kodrycka M, Patkowski K. Platinum, gold, and silver standards of intermolecular interaction energy calculations. J Chem Phys 2019; 151:070901. [DOI: 10.1063/1.5116151] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Monika Kodrycka
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, USA
| | - Konrad Patkowski
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, USA
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30
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Su X, McCardle KM, Chen L, Panetier JA, Jurss JW. Robust and Selective Cobalt Catalysts Bearing Redox-Active Bipyridyl-N-heterocyclic Carbene Frameworks for Electrochemical CO2 Reduction in Aqueous Solutions. ACS Catal 2019. [DOI: 10.1021/acscatal.9b00708] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Xiaojun Su
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677, United States
| | - Kaitlin M. McCardle
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Lizhu Chen
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677, United States
| | - Julien A. Panetier
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Jonah W. Jurss
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677, United States
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31
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Sung S, Li X, Wolf LM, Meeder JR, Bhuvanesh NS, Grice KA, Panetier JA, Nippe M. Synergistic Effects of Imidazolium-Functionalization on fac-Mn(CO)3 Bipyridine Catalyst Platforms for Electrocatalytic Carbon Dioxide Reduction. J Am Chem Soc 2019; 141:6569-6582. [DOI: 10.1021/jacs.8b13657] [Citation(s) in RCA: 81] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Siyoung Sung
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77843, United States
| | - Xiaohui Li
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Lucienna M. Wolf
- Department of Chemistry and Biochemistry, DePaul University, 1110 West Belden Avenue, Chicago, Illinois 60614, United States
| | - Jeremy R. Meeder
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77843, United States
| | - Nattamai S. Bhuvanesh
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77843, United States
| | - Kyle A. Grice
- Department of Chemistry and Biochemistry, DePaul University, 1110 West Belden Avenue, Chicago, Illinois 60614, United States
| | - Julien A. Panetier
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Michael Nippe
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77843, United States
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32
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Bajaj P, Riera M, Lin JK, Mendoza Montijo YE, Gazca J, Paesani F. Halide Ion Microhydration: Structure, Energetics, and Spectroscopy of Small Halide–Water Clusters. J Phys Chem A 2019; 123:2843-2852. [DOI: 10.1021/acs.jpca.9b00816] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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33
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Pitsevich G, Malevich A, Kozlovskaya E, Sablinskas V, Balevicius V. Anharmonicity of the bonded O H group vibrations in water dimer. DFT study including dispersion interaction. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2018.12.033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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34
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Malloum A, Fifen JJ, Dhaouadi Z, Nana Engo SG, Conradie J. Structures, relative stability and binding energies of neutral water clusters, (H2O)2–30. NEW J CHEM 2019. [DOI: 10.1039/c9nj01659g] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
We have revised the structures of neutral water clusters, (H2O)n=2–30, with the affordable M06-2X functional, presenting up to 25 isomers for each cluster size.
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Affiliation(s)
- Alhadji Malloum
- Department of Physics
- Faculty of Science
- University of Ngaoundere
- Ngaoundere
- Cameroon
| | - Jean Jules Fifen
- Department of Physics
- Faculty of Science
- University of Ngaoundere
- Ngaoundere
- Cameroon
| | - Zoubeida Dhaouadi
- Laboratoire de Spectroscopie Atomique Moléculaire et Applications
- Faculté des Sciences de Tunis
- Université de Tunis El Manar
- Tunis
- Tunisia
| | - Serge Guy Nana Engo
- Department of Physics
- Faculty of Science
- University of Ngaoundere
- Ngaoundere
- Cameroon
| | - Jeanet Conradie
- Department of Chemistry
- University of the Free State
- Bloemfontein
- South Africa
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35
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Manca Tanner C, Quack M, Schmidiger D. Nuclear spin symmetry conservation and relaxation of water (H216O) seeded in supersonic jets of argon and oxygen: measurements by cavity ring-down laser spectroscopy. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1484952] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
| | - Martin Quack
- Laboratorium für Physikalische Chemie, ETH Zürich, Zürich, Switzerland
| | - David Schmidiger
- Laboratorium für Physikalische Chemie, ETH Zürich, Zürich, Switzerland
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36
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37
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Krasnoshchekov SV, Schutski RS, Craig NC, Sibaev M, Crittenden DL. Comparing the accuracy of perturbative and variational calculations for predicting fundamental vibrational frequencies of dihalomethanes. J Chem Phys 2018; 148:084102. [DOI: 10.1063/1.5020295] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Sergey V. Krasnoshchekov
- Department of Chemistry, Lomonosov Moscow State University, Leninskiye Gory 1-3, Moscow 119991, Russian Federation
| | | | - Norman C. Craig
- Department of Chemistry and Biochemistry, Oberlin College, Oberlin, Ohio 44074, USA
| | - Marat Sibaev
- Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
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38
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Mata RA, Suhm MA. Benchmarking Quantum Chemical Methods: Are We Heading in the Right Direction? Angew Chem Int Ed Engl 2017; 56:11011-11018. [PMID: 28452424 PMCID: PMC5582598 DOI: 10.1002/anie.201611308] [Citation(s) in RCA: 100] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 12/20/2016] [Indexed: 11/15/2022]
Abstract
Theoreticians and experimentalists should work together more closely to establish reliable rankings and benchmarks for quantum chemical methods. Comparison to carefully designed experimental benchmark data should be a priority. Guidelines to improve the situation for experiments and calculations are proposed.
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Affiliation(s)
- Ricardo A. Mata
- Institut für Physikalische ChemieUniversität GöttingenTammannstrasse 637077GöttingenGermany
| | - Martin A. Suhm
- Institut für Physikalische ChemieUniversität GöttingenTammannstrasse 637077GöttingenGermany
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39
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Manna D, Kesharwani MK, Sylvetsky N, Martin JML. Conventional and Explicitly Correlated ab Initio Benchmark Study on Water Clusters: Revision of the BEGDB and WATER27 Data Sets. J Chem Theory Comput 2017; 13:3136-3152. [DOI: 10.1021/acs.jctc.6b01046] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Debashree Manna
- Department of Organic Chemistry, Weizmann Institute of Science, 76100 Rechovot, Israel
| | - Manoj K. Kesharwani
- Department of Organic Chemistry, Weizmann Institute of Science, 76100 Rechovot, Israel
| | - Nitai Sylvetsky
- Department of Organic Chemistry, Weizmann Institute of Science, 76100 Rechovot, Israel
| | - Jan M. L. Martin
- Department of Organic Chemistry, Weizmann Institute of Science, 76100 Rechovot, Israel
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40
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Liu K, Liu J, Herbert JM. Accuracy of finite‐difference harmonic frequencies in density functional theory. J Comput Chem 2017; 38:1678-1684. [DOI: 10.1002/jcc.24811] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Accepted: 03/19/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Kuan‐Yu Liu
- Department of Chemistry and BiochemistryThe Ohio State UniversityColumbus Ohio43210
| | - Jie Liu
- Department of Chemistry and BiochemistryThe Ohio State UniversityColumbus Ohio43210
| | - John M. Herbert
- Department of Chemistry and BiochemistryThe Ohio State UniversityColumbus Ohio43210
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41
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Ruiz Pestana L, Mardirossian N, Head-Gordon M, Head-Gordon T. Ab initio molecular dynamics simulations of liquid water using high quality meta-GGA functionals. Chem Sci 2017; 8:3554-3565. [PMID: 30155200 PMCID: PMC6092720 DOI: 10.1039/c6sc04711d] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2016] [Accepted: 02/24/2017] [Indexed: 01/23/2023] Open
Abstract
We have used ab initio molecular dynamics (AIMD) to characterize water properties using two meta-generalized gradient approximation (meta-GGA) functionals, M06-L-D3 and B97M-rV, and compared their performance against a standard GGA corrected for dispersion, revPBE-D3, at ambient conditions (298 K, and 1 g cm-3 or 1 atm). Simulations of the equilibrium density, radial distribution functions, self-diffusivity, the infrared spectrum, liquid dipole moments, and characterizations of the hydrogen bond network show that all three functionals have overcome the problem of the early AIMD simulations that erroneously found ambient water to be highly structured, but they differ substantially among themselves in agreement with experiment on this range of water properties. We show directly using water cluster data up through the pentamer that revPBE-D3 benefits from a cancellation of its intrinsic functional error by running classical trajectories, whereas the meta-GGA functionals are demonstrably more accurate and would require the simulation of nuclear quantum effects to realize better agreement with all cluster and condensed phase properties.
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Affiliation(s)
- Luis Ruiz Pestana
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , USA .
| | - Narbe Mardirossian
- Kenneth S. Pitzer Center for Theoretical Chemistry , Department of Chemistry , University of California , Berkeley , USA
| | - Martin Head-Gordon
- Kenneth S. Pitzer Center for Theoretical Chemistry , Department of Chemistry , University of California , Berkeley , USA
| | - Teresa Head-Gordon
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , USA .
- Kenneth S. Pitzer Center for Theoretical Chemistry , Department of Chemistry , University of California , Berkeley , USA
- Departments of Chemistry , Bioengineering , Chemical and Biomolecular Engineering , University of California , Berkeley , USA
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42
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Mata RA, Suhm MA. Quantenchemische Methoden im Leistungsvergleich: Stimmt die Richtung noch? Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611308] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ricardo A. Mata
- Institut für Physikalische Chemie; Universität Göttingen; Tammannstraße 6 37077 Göttingen Deutschland
| | - Martin A. Suhm
- Institut für Physikalische Chemie; Universität Göttingen; Tammannstraße 6 37077 Göttingen Deutschland
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43
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Dissociation in Binary Acid/Base Clusters: An Examination of Inconsistencies Introduced Into the Many-Body Expansion by Naïve Fragmentation Schemes. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/bs.arcc.2017.06.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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44
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Gu Q, Su P, Xia Y, Yang Z, Trindle CO, Knee JL. Quantitative probing of subtle interactions among H-bonds in alpha hydroxy carboxylic acid complexes. Phys Chem Chem Phys 2017; 19:24399-24411. [DOI: 10.1039/c7cp03917d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The alpha OH stretching frequency may be affected upon complexing with water and formic acid.
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Affiliation(s)
- Quanli Gu
- School of Basic Medical Sciences
- Xinxiang Medical University
- Xinxiang
- China
- Chemistry Department
| | - Peifeng Su
- State Key Laboratory of Physical Chemistry of Solid Surfaces
- Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, and College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen
- China
| | - Yong Xia
- State Key Laboratory of Precision Spectroscopy
- School of Physics and Materials Science
- East China Normal University
- Shanghai 200062
- China
| | - Zhijun Yang
- School of Basic Medical Sciences
- Xinxiang Medical University
- Xinxiang
- China
| | - Carl O. Trindle
- Chemistry Department
- University of Virginia
- Charlottesville
- USA
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45
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Wang B, Jiang W, Gao Y, Zhang Z, Sun C, Liu F, Wang Z. Energetics competition in centrally four-coordinated water clusters and Raman spectroscopic signature for hydrogen bonding. RSC Adv 2017. [DOI: 10.1039/c6ra28335g] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Viaseparating the H-bonded neighbour molecules of centrally four-coordinated water molecules from other molecules in outer cages, the calculations discover these two regions interact competitively with the central molecule.
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Affiliation(s)
- Bo Wang
- Institute of Atomic and Molecular Physics
- Jilin University
- Changchun 130012
- China
- Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy
| | - Wanrun Jiang
- Institute of Atomic and Molecular Physics
- Jilin University
- Changchun 130012
- China
- Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy
| | - Yang Gao
- Institute of Atomic and Molecular Physics
- Jilin University
- Changchun 130012
- China
- Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy
| | - Zhiyuan Zhang
- Institute of Atomic and Molecular Physics
- Jilin University
- Changchun 130012
- China
- Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy
| | - Changqing Sun
- School of Electrical and Electronic Engineering
- Nanyang Technological University
- Singapore 639798
- Singapore
| | - Fang Liu
- Institute of Atomic and Molecular Physics
- Jilin University
- Changchun 130012
- China
- Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy
| | - Zhigang Wang
- Institute of Atomic and Molecular Physics
- Jilin University
- Changchun 130012
- China
- Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy
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46
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Reddy SK, Straight SC, Bajaj P, Huy Pham C, Riera M, Moberg DR, Morales MA, Knight C, Götz AW, Paesani F. On the accuracy of the MB-pol many-body potential for water: Interaction energies, vibrational frequencies, and classical thermodynamic and dynamical properties from clusters to liquid water and ice. J Chem Phys 2016; 145:194504. [DOI: 10.1063/1.4967719] [Citation(s) in RCA: 161] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Affiliation(s)
- Sandeep K. Reddy
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA
| | - Shelby C. Straight
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA
| | - Pushp Bajaj
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA
| | - C. Huy Pham
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA
| | - Marc Riera
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA
| | - Daniel R. Moberg
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA
| | - Miguel A. Morales
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - Chris Knight
- Leadership Computing Facility, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
| | - Andreas W. Götz
- San Diego Supercomputer Center, University of California, San Diego, La Jolla, California 92093, USA
| | - Francesco Paesani
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA
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47
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Paesani F. Getting the Right Answers for the Right Reasons: Toward Predictive Molecular Simulations of Water with Many-Body Potential Energy Functions. Acc Chem Res 2016; 49:1844-51. [PMID: 27548325 DOI: 10.1021/acs.accounts.6b00285] [Citation(s) in RCA: 100] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The central role played by water in fundamental processes relevant to different disciplines, including chemistry, physics, biology, materials science, geology, and climate research, cannot be overemphasized. It is thus not surprising that, since the pioneering work by Stillinger and Rahman, many theoretical and computational studies have attempted to develop a microscopic description of the unique properties of water under different thermodynamic conditions. Consequently, numerous molecular models based on either molecular mechanics or ab initio approaches have been proposed over the years. However, despite continued progress, the correct prediction of the properties of water from small gas-phase clusters to the liquid phase and ice through a single molecular model remains challenging. To large extent, this is due to the difficulties encountered in the accurate modeling of the underlying hydrogen-bond network in which both number and strength of the hydrogen bonds vary continuously as a result of a subtle interplay between energetic, entropic, and nuclear quantum effects. In the past decade, the development of efficient algorithms for correlated electronic structure calculations of small molecular complexes, accompanied by tremendous progress in the analytical representation of multidimensional potential energy surfaces, opened the doors to the design of highly accurate potential energy functions built upon rigorous representations of the many-body expansion (MBE) of the interaction energies. This Account provides a critical overview of the performance of the MB-pol many-body potential energy function through a systematic analysis of energetic, structural, thermodynamic, and dynamical properties as well as of vibrational spectra of water from the gas to the condensed phase. It is shown that MB-pol achieves unprecedented accuracy across all phases of water through a quantitative description of each individual term of the MBE, with a physically correct representation of both short- and long-range many-body contributions. Comparisons with experimental data probing different regions of the water potential energy surface from clusters to bulk demonstrate that MB-pol represents a major step toward the long-sought-after "universal model" capable of accurately describing the molecular properties of water under different conditions and in different environments. Along this path, future challenges include the extension of the many-body scheme adopted by MB-pol to the description of generic solutes as well as the integration of MB-pol in an efficient theoretical and computational framework to model acid-base reactions in aqueous environments. In this context, given the nontraditional form of the MB-pol energy and force expressions, synergistic efforts by theoretical/computational chemists/physicists and computer scientists will be critical for the development of high-performance software for many-body molecular dynamics simulations.
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Affiliation(s)
- Francesco Paesani
- Department of Chemistry and
Biochemistry, University of California—San Diego, La Jolla, California 92093, United States
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48
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Mallory JD, Mandelshtam VA. Diffusion Monte Carlo studies of MB-pol (H2O)2−6 and (D2O)2−6 clusters: Structures and binding energies. J Chem Phys 2016. [DOI: 10.1063/1.4960610] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Joel D. Mallory
- Department of Chemistry, University of California, Irvine, California 92697, USA
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49
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Cisneros G, Wikfeldt KT, Ojamäe L, Lu J, Xu Y, Torabifard H, Bartók AP, Csányi G, Molinero V, Paesani F. Modeling Molecular Interactions in Water: From Pairwise to Many-Body Potential Energy Functions. Chem Rev 2016; 116:7501-28. [PMID: 27186804 PMCID: PMC5450669 DOI: 10.1021/acs.chemrev.5b00644] [Citation(s) in RCA: 272] [Impact Index Per Article: 34.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2015] [Indexed: 12/17/2022]
Abstract
Almost 50 years have passed from the first computer simulations of water, and a large number of molecular models have been proposed since then to elucidate the unique behavior of water across different phases. In this article, we review the recent progress in the development of analytical potential energy functions that aim at correctly representing many-body effects. Starting from the many-body expansion of the interaction energy, specific focus is on different classes of potential energy functions built upon a hierarchy of approximations and on their ability to accurately reproduce reference data obtained from state-of-the-art electronic structure calculations and experimental measurements. We show that most recent potential energy functions, which include explicit short-range representations of two-body and three-body effects along with a physically correct description of many-body effects at all distances, predict the properties of water from the gas to the condensed phase with unprecedented accuracy, thus opening the door to the long-sought "universal model" capable of describing the behavior of water under different conditions and in different environments.
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Affiliation(s)
| | - Kjartan Thor Wikfeldt
- Science
Institute, University of Iceland, VR-III, 107, Reykjavik, Iceland
- Department
of Physics, Albanova, Stockholm University, S-106 91 Stockholm, Sweden
| | - Lars Ojamäe
- Department
of Chemistry, Linköping University, SE-581 83 Linköping, Sweden
| | - Jibao Lu
- Department
of Chemistry, The University of Utah, Salt Lake City, Utah 84112-0850, United States
| | - Yao Xu
- Lehrstuhl
Physikalische Chemie II, Ruhr-Universität
Bochum, 44801 Bochum, Germany
| | - Hedieh Torabifard
- Department
of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
| | - Albert P. Bartók
- Engineering
Laboratory, University of Cambridge, Trumpington Street, Cambridge CB21PZ, United Kingdom
| | - Gábor Csányi
- Engineering
Laboratory, University of Cambridge, Trumpington Street, Cambridge CB21PZ, United Kingdom
| | - Valeria Molinero
- Department
of Chemistry, The University of Utah, Salt Lake City, Utah 84112-0850, United States
| | - Francesco Paesani
- Department
of Chemistry and Biochemistry, University
of California San Diego, La Jolla, California 92093, United States
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50
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Howard JC, Enyard JD, Tschumper GS. Assessing the accuracy of some popular DFT methods for computing harmonic vibrational frequencies of water clusters. J Chem Phys 2016; 143:214103. [PMID: 26646865 DOI: 10.1063/1.4936654] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A wide range of density functional theory (DFT) methods (37 altogether), including pure, hybrid, range-separated hybrid, double-hybrid, and dispersion-corrected functionals, have been employed to compute the harmonic vibrational frequencies of eight small water clusters ranging in size from the dimer to four different isomers of the hexamer. These computed harmonic frequencies have been carefully compared to recently published benchmark values that are expected to be very close to the CCSD(T) complete basis set limit. Of the DFT methods examined here, ωB97 and ωB97X are the most consistently accurate, deviating from the reference values by less than 20 cm(-1) on average and never more than 60 cm(-1). The performance of double-hybrid methods including B2PLYP and mPW2-PLYP is only slightly better than more economical approaches, such as the M06-L pure functional and the M06-2X hybrid functional. Additionally, dispersion corrections offer very little improvement in computed frequencies.
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Affiliation(s)
- J Coleman Howard
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677-1848, USA
| | - Jordan D Enyard
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677-1848, USA
| | - Gregory S Tschumper
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677-1848, USA
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