1
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Sitkiewicz SP, Ramos-Cordoba E, Luis JM, Matito E. How Many Electrons Does a Molecular Electride Hold? J Phys Chem A 2021; 125:4819-4835. [PMID: 34038110 DOI: 10.1021/acs.jpca.1c02760] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Electrides are very peculiar ionic compounds where electrons occupy the anionic positions. In a crystal lattice, these isolated electrons often form channels or surfaces, furnishing electrides with many traits with promising technological applications. Despite their huge potential, thus far, only a few stable electrides have been produced because of the intricate synthesis they entail. Due to the difficulty in assessing the presence of isolated electrons, the characterization of electrides also poses some serious challenges. In fact, their properties are expected to depend on the arrangement of these electrons in the molecule. Among the criteria that we can use to characterize electrides, the presence of a non-nuclear attractor (NNA) of the electron density is both the rarest and the most salient feature. Therefore, a correct description of the NNA is crucial to determine the properties of electrides. In this paper, we analyze the NNA and the surrounding region of nine molecular electrides to determine the number of isolated electrons held in the electride. We have seen that the correct description of a molecular electride hinges on the electronic structure method employed for the analyses. In particular, one should employ a basis set with sufficient flexibility to describe the region close to the NNA and a density functional approximation that does not suffer from large delocalization errors. Finally, we have classified these nine molecular electrides according to the most likely number of electrons that we can find in the NNA. We believe this classification highlights the strength of the electride character and will prove useful in designing new electrides.
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Affiliation(s)
- Sebastian P Sitkiewicz
- Donostia International Physics Center (DIPC), 20018 Donostia, Euskadi, Spain.,Polimero eta Material Aurreratuak: Fisika, Kimika eta Teknologia, Kimika Fakultatea, Euskal Herriko Unibertsitatea UPV/EHU, P.K. 1072, 20080 Donostia, Euskadi, Spain
| | - Eloy Ramos-Cordoba
- Donostia International Physics Center (DIPC), 20018 Donostia, Euskadi, Spain.,Polimero eta Material Aurreratuak: Fisika, Kimika eta Teknologia, Kimika Fakultatea, Euskal Herriko Unibertsitatea UPV/EHU, P.K. 1072, 20080 Donostia, Euskadi, Spain
| | - Josep M Luis
- Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química, Universitat de Girona, 17003 Girona, Catalonia, Spain
| | - Eduard Matito
- Donostia International Physics Center (DIPC), 20018 Donostia, Euskadi, Spain.,Ikerbasque Foundation for Science, Plaza Euskadi 5, 48009 Bilbao, Euskadi, Spain
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2
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Ramírez-Palma DI, Cortés-Guzmán F. From the Linnett-Gillespie model to the polarization of the spin valence shells of metals in complexes. Phys Chem Chem Phys 2020; 22:24201-24212. [PMID: 32851390 DOI: 10.1039/d0cp02064h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this paper, we present a novel approach to track the origin of the metal complex structure from the topology of the α and β spin densities as an extension of the Linnett-Gillespie model. Usually, the theories that explain the metal-ligand interactions consider the disposition and the relative energies of the empty or occupied set of d orbitals, ignoring the spin contribution explicitly. Our quantum topological approach considers the spatial distribution of the α and β spin valence shells, and the energy interaction between them. We used the properties of the atomic graph, a topological object that summarises the charge concentrations and depletions on the valence shell of an atom in a molecule, and the interacting quantum atoms (IQA) energy partition scheme. Unlike the Linnett-Gillespie model, which is based on electron-electron repulsion, our approach states that the ligands provoke a redistribution of the electron density to maximize the nuclear-electron interactions in each spin valence shell to bypass the concentration of electron-electron interactions, resulting in a polarization pattern which determines the position of the ligands.
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Affiliation(s)
- David I Ramírez-Palma
- Universidad Nacional Autónoma de México, Instituto de Química, Ciudad Universitaria, Ciudad de Mexico, 04510, Mexico.
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3
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Guevara-Vela JM, Francisco E, Rocha-Rinza T, Martín Pendás Á. Interacting Quantum Atoms-A Review. Molecules 2020; 25:E4028. [PMID: 32899346 PMCID: PMC7504790 DOI: 10.3390/molecules25174028] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 08/24/2020] [Accepted: 08/26/2020] [Indexed: 12/16/2022] Open
Abstract
The aim of this review is threefold. On the one hand, we intend it to serve as a gentle introduction to the Interacting Quantum Atoms (IQA) methodology for those unfamiliar with it. Second, we expect it to act as an up-to-date reference of recent developments related to IQA. Finally, we want it to highlight a non-exhaustive, yet representative set of showcase examples about how to use IQA to shed light in different chemical problems. To accomplish this, we start by providing a brief context to justify the development of IQA as a real space alternative to other existent energy partition schemes of the non-relativistic energy of molecules. We then introduce a self-contained algebraic derivation of the methodological IQA ecosystem as well as an overview of how these formulations vary with the level of theory employed to obtain the molecular wavefunction upon which the IQA procedure relies. Finally, we review the several applications of IQA as examined by different research groups worldwide to investigate a wide variety of chemical problems.
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Affiliation(s)
- José Manuel Guevara-Vela
- Institute of Chemistry, National Autonomous University of Mexico, Circuito Exterior, Ciudad Universitaria, Delegación Coyoacán C.P., Mexico City 04510, Mexico; (J.M.G.-V.); (T.R.-R.)
| | - Evelio Francisco
- Department of Analytical and Physical Chemistry, University of Oviedo, E-33006 Oviedo, Spain;
| | - Tomás Rocha-Rinza
- Institute of Chemistry, National Autonomous University of Mexico, Circuito Exterior, Ciudad Universitaria, Delegación Coyoacán C.P., Mexico City 04510, Mexico; (J.M.G.-V.); (T.R.-R.)
| | - Ángel Martín Pendás
- Department of Analytical and Physical Chemistry, University of Oviedo, E-33006 Oviedo, Spain;
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4
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Casals‐Sainz JL, Guevara‐Vela JM, Francisco E, Rocha‐Rinza T, Martín Pendás Á. Efficient implementation of the interacting quantum atoms energy partition of the second‐order Møller–Plesset energy. J Comput Chem 2020; 41:1234-1241. [DOI: 10.1002/jcc.26169] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Revised: 01/30/2020] [Accepted: 01/30/2020] [Indexed: 12/19/2022]
Affiliation(s)
| | - José Manuel Guevara‐Vela
- Institute of Chemistry, National Autonomous University of Mexico, Circuito ExteriorCiudad Universitaria Mexico City Mexico
| | - Evelio Francisco
- Department of Analytical and Physical ChemistryUniversity of Oviedo Oviedo Spain
| | - Tomás Rocha‐Rinza
- Institute of Chemistry, National Autonomous University of Mexico, Circuito ExteriorCiudad Universitaria Mexico City Mexico
| | - Ángel Martín Pendás
- Department of Analytical and Physical ChemistryUniversity of Oviedo Oviedo Spain
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5
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Silva AF, Duarte LJ, Popelier PLA. Contributions of IQA electron correlation in understanding the chemical bond and non-covalent interactions. Struct Chem 2020. [DOI: 10.1007/s11224-020-01495-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AbstractThe quantum topological energy partitioning method Interacting Quantum Atoms (IQA) has been applied for over a decade resulting in an enlightening analysis of a variety of systems. In the last three years we have enriched this analysis by incorporating into IQA the two-particle density matrix obtained from Møller–Plesset (MP) perturbation theory. This work led to a new computational and interpretational tool to generate atomistic electron correlation and thus topologically based dispersion energies. Such an analysis determines the effects of electron correlation within atoms and between atoms, which covers both bonded and non-bonded “through -space” atom–atom interactions within a molecule or molecular complex. A series of papers published by us and other groups shows that the behavior of electron correlation is deeply ingrained in structural chemistry. Some concepts that were shown to be connected to bond correlation are bond order, multiplicity, aromaticity, and hydrogen bonding. Moreover, the concepts of covalency and ionicity were shown not to be mutually excluding but to both contribute to the stability of polar bonds. The correlation energy is considerably easier to predict by machine learning (kriging) than other IQA terms. Regarding the nature of the hydrogen bond, correlation energy presents itself in an almost contradicting way: there is much localized correlation energy in a hydrogen bond system, but its overall effect is null due to internal cancelation. Furthermore, the QTAIM delocalization index has a connection with correlation energy. We also explore the role of electron correlation in protobranching, which provides an explanation for the extra stabilization present in branched alkanes compared to their linear counterparts. We hope to show the importance of understanding the true nature of the correlation energy as the foundation of a modern representation of dispersion forces for ab initio, DFT, and force field calculations.
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6
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Maulén B, Echeverri A, Gómez T, Fuentealba P, Cárdenas C. Electron Localization Function in Excited States: The Case of the Ultrafast Proton Transfer of the Salicylidene Methylamine. J Chem Theory Comput 2019; 15:5532-5542. [DOI: 10.1021/acs.jctc.9b00691] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Boris Maulén
- Departamento de Física, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile
| | - Andrea Echeverri
- Departamento de Física, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile
| | - Tatiana Gómez
- Instituto de Ciencias Químicas Aplicadas, Theoretical and Computational Chemistry Center, Facultad de Ingeniería, Universidad Autónoma de Chile, Av. El Llano Subercaseaux 2801, San Miguel, Santiago, Chile
| | - Patricio Fuentealba
- Departamento de Física, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile
- Centro para el Desarrollo de la Nanociencia y la Nanotecnología (CEDENNA), Avda. Ecuador 3493, Santiago 9170124, Chile
| | - Carlos Cárdenas
- Departamento de Física, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile
- Centro para el Desarrollo de la Nanociencia y la Nanotecnología (CEDENNA), Avda. Ecuador 3493, Santiago 9170124, Chile
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7
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Rodríguez-Mayorga M, Ramos-Cordoba E, Lopez X, Solà M, Ugalde JM, Matito E. The Coulomb Hole of the Ne Atom. ChemistryOpen 2019; 8:411-417. [PMID: 30976484 PMCID: PMC6442706 DOI: 10.1002/open.201800235] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Revised: 12/20/2018] [Indexed: 11/10/2022] Open
Abstract
We analyze the Coulomb hole of Ne from highly-accurate CISD wave functions obtained from optimized even-tempered basis sets. Using a two-fold extrapolation procedure we obtain highly accurate results that recover 97 % of the correlation energy. We confirm the existence of a shoulder in the short-range region of the Coulomb hole of the Ne atom, which is due to an internal reorganization of the K-shell caused by electron correlation of the core electrons. The feature is very sensitive to the quality of the basis set in the core region and it is not exclusive to Ne, being also present in most of second-row atoms, thus confirming that it is due to K-shell correlation effects.
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Affiliation(s)
- Mauricio Rodríguez-Mayorga
- Kimika Fakultatea Euskal Herriko Unibertsitatea (UPV/EHU) Donostia International Physics Center (DIPC) P.K. 1072 20080 Donostia, Euskadi Spain E-mail: eloy.raco_at_gmail.com.,Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química University of Girona C/ Maria Aurèlia Capmany, 69 17003 Girona Catalonia Spain
| | - Eloy Ramos-Cordoba
- Kimika Fakultatea Euskal Herriko Unibertsitatea (UPV/EHU) Donostia International Physics Center (DIPC) P.K. 1072 20080 Donostia, Euskadi Spain E-mail: eloy.raco_at_gmail.com
| | - Xabier Lopez
- Kimika Fakultatea Euskal Herriko Unibertsitatea (UPV/EHU) Donostia International Physics Center (DIPC) P.K. 1072 20080 Donostia, Euskadi Spain E-mail: eloy.raco_at_gmail.com
| | - Miquel Solà
- Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química University of Girona C/ Maria Aurèlia Capmany, 69 17003 Girona Catalonia Spain
| | - Jesus M Ugalde
- Kimika Fakultatea Euskal Herriko Unibertsitatea (UPV/EHU) Donostia International Physics Center (DIPC) P.K. 1072 20080 Donostia, Euskadi Spain E-mail: eloy.raco_at_gmail.com
| | - Eduard Matito
- Kimika Fakultatea Euskal Herriko Unibertsitatea (UPV/EHU) Donostia International Physics Center (DIPC) P.K. 1072 20080 Donostia, Euskadi Spain E-mail: eloy.raco_at_gmail.com.,IKERBASQUE, Basque Foundation for Science 48011 Bilbao, Euskadi Spain
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8
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Popelier PLA, Maxwell PI, Thacker JCR, Alkorta I. A relative energy gradient (REG) study of the planar and perpendicular torsional energy barriers in biphenyl. Theor Chem Acc 2018; 138:12. [PMID: 30872951 PMCID: PMC6383956 DOI: 10.1007/s00214-018-2383-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Accepted: 11/14/2018] [Indexed: 11/24/2022]
Abstract
Biphenyl is a prototype molecule, the study of which is important for a proper understanding of stereo-electronic effects. In the gas phase it has an equilibrium central torsion angle of ~ 45° and shows both a planar (0°) and a perpendicular (90°) torsional energy barrier. The latter is analysed for the first time. We use the newly proposed REG method, which is an exhaustive procedure that automatically ranks atomic energy contributions according to their importance in explaining the energy profile of a total system. Here, the REG method operates on energy contributions computed by the interacting quantum atoms method. This method is minimal in architecture and provides a crisp picture of well-defined and well-separated electrostatic, steric and exchange (covalent) energies at atomistic level. It is shown that the bond critical point occurring between the ortho-hydrogens in the planar geometry has been wrongly interpreted as a sign of repulsive interaction. A convenient metaphor of analysing football matches is introduced to clarify the role of a REG analysis.
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Affiliation(s)
- Paul L. A. Popelier
- Manchester Institute of Biotechnology (MIB), 131 Princess Street, Manchester, M1 7DN UK
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL UK
| | - Peter I. Maxwell
- Manchester Institute of Biotechnology (MIB), 131 Princess Street, Manchester, M1 7DN UK
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL UK
| | - Joseph C. R. Thacker
- Manchester Institute of Biotechnology (MIB), 131 Princess Street, Manchester, M1 7DN UK
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL UK
| | - Ibon Alkorta
- Instituto de Química Médica (IQM-CSIC), Juan de la Cierva, 3, 28006 Madrid, Spain
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9
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Tognetti V, Silva AF, Vincent MA, Joubert L, Popelier PLA. Decomposition of Møller–Plesset Energies within the Quantum Theory of Atoms-in-Molecules. J Phys Chem A 2018; 122:7748-7756. [DOI: 10.1021/acs.jpca.8b05357] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Vincent Tognetti
- Normandy University, COBRA UMR 6014 & FR 3038, Université de Rouen, INSA Rouen, CNRS, 1 rue Tesniére, 76821 Mont St Aignan, Cedex, France
| | - Arnaldo F. Silva
- Manchester Institute of Biotechnology (MIB), 131 Princess Street, Manchester M1 7DN, Great Britain
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, Great Britain
| | - Mark A. Vincent
- Manchester Institute of Biotechnology (MIB), 131 Princess Street, Manchester M1 7DN, Great Britain
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, Great Britain
| | - Laurent Joubert
- Normandy University, COBRA UMR 6014 & FR 3038, Université de Rouen, INSA Rouen, CNRS, 1 rue Tesniére, 76821 Mont St Aignan, Cedex, France
| | - Paul L. A. Popelier
- Manchester Institute of Biotechnology (MIB), 131 Princess Street, Manchester M1 7DN, Great Britain
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, Great Britain
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10
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Outeiral C, Vincent MA, Martín Pendás Á, Popelier PLA. Revitalizing the concept of bond order through delocalization measures in real space. Chem Sci 2018; 9:5517-5529. [PMID: 30061983 PMCID: PMC6049528 DOI: 10.1039/c8sc01338a] [Citation(s) in RCA: 85] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Accepted: 05/29/2018] [Indexed: 11/22/2022] Open
Abstract
Ab initio quantum chemistry is an independent source of information supplying an ever widening group of experimental chemists. However, bridging the gap between these ab initio data and chemical insight remains a challenge. In particular, there is a need for a bond order index that characterizes novel bonding patterns in a reliable manner, while recovering the familiar effects occurring in well-known bonds. In this article, through a large body of calculations, we show how the delocalization index derived from Quantum Chemical Topology (QCT) serves as such a bond order. This index is defined in a parameter-free, intuitive and consistent manner, and with little qualitative dependency on the level of theory used. The delocalization index is also able to detect the subtler bonding effects that underpin most practical organic and inorganic chemistry. We explore and connect the properties of this index and open the door for its extensive usage in the understanding and discovery of novel chemistry.
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Affiliation(s)
- Carlos Outeiral
- Manchester Institute of Biotechnology (MIB) , 131 Princess Street , Manchester M1 7DN , UK .
- School of Chemistry , University of Manchester , Oxford Road , Manchester M13 9PL , UK
- Department of Physical and Analytical Chemistry , University of Oviedo , Julián Clavería 8 , Oviedo , Spain
| | - Mark A Vincent
- Manchester Institute of Biotechnology (MIB) , 131 Princess Street , Manchester M1 7DN , UK .
- School of Chemistry , University of Manchester , Oxford Road , Manchester M13 9PL , UK
| | - Ángel Martín Pendás
- Department of Physical and Analytical Chemistry , University of Oviedo , Julián Clavería 8 , Oviedo , Spain
| | - Paul L A Popelier
- Manchester Institute of Biotechnology (MIB) , 131 Princess Street , Manchester M1 7DN , UK .
- School of Chemistry , University of Manchester , Oxford Road , Manchester M13 9PL , UK
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11
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Pastorczak E, Corminboeuf C. Perspective: Found in translation: Quantum chemical tools for grasping non-covalent interactions. J Chem Phys 2018; 146:120901. [PMID: 28388098 DOI: 10.1063/1.4978951] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Today's quantum chemistry methods are extremely powerful but rely upon complex quantities such as the massively multidimensional wavefunction or even the simpler electron density. Consequently, chemical insight and a chemist's intuition are often lost in this complexity leaving the results obtained difficult to rationalize. To handle this overabundance of information, computational chemists have developed tools and methodologies that assist in composing a more intuitive picture that permits better understanding of the intricacies of chemical behavior. In particular, the fundamental comprehension of phenomena governed by non-covalent interactions is not easily achieved in terms of either the total wavefunction or the total electron density, but can be accomplished using more informative quantities. This perspective provides an overview of these tools and methods that have been specifically developed or used to analyze, identify, quantify, and visualize non-covalent interactions. These include the quantitative energy decomposition analysis schemes and the more qualitative class of approaches such as the Non-covalent Interaction index, the Density Overlap Region Indicator, or quantum theory of atoms in molecules. Aside from the enhanced knowledge gained from these schemes, their strengths, limitations, as well as a roadmap for expanding their capabilities are emphasized.
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Affiliation(s)
- Ewa Pastorczak
- Laboratory for Computational Molecular Design, Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Clémence Corminboeuf
- Laboratory for Computational Molecular Design, Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
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12
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Rodríguez-Mayorga M, Via-Nadal M, Solà M, Ugalde JM, Lopez X, Matito E. Electron-Pair Distribution in Chemical Bond Formation. J Phys Chem A 2018; 122:1916-1923. [PMID: 29381071 DOI: 10.1021/acs.jpca.7b12556] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The chemical formation process has been studied from relaxation holes, Δh(u), resulting from the difference between the radial intracule density and the nonrelaxed counterpart, which is obtained from atomic radial intracule densities and the pair density constructed from the overlap of the atomic densities. Δh(u) plots show that the internal reorganization of electron pairs prior to bond formation and the covalent bond formation from electrons in separate atoms are completely recognizable processes from the shape of the relaxation hole, Δh(u). The magnitude of Δh(u), the shape of Δh(u) ∀ u < Req, and the distance between the minimum and the maximum in Δh(u) provide further information about the nature of the chemical bond formed. A computational affordable approach to calculate the radial intracule density from approximate pair densities has been also suggested, paving the way to study electron-pair distributions in larger systems.
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Affiliation(s)
- M Rodríguez-Mayorga
- Kimika Fakultatea, Euskal Herriko Unibertsitatea, UPV/EHU, and Donostia International Physics Center (DIPC). P.K. 1072 , 20080 Donostia, Euskadi, Spain.,Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química, University of Girona , C/ Maria Aurèlia Capmany, 69, 17003 Girona, Catalonia, Spain
| | - M Via-Nadal
- Kimika Fakultatea, Euskal Herriko Unibertsitatea, UPV/EHU, and Donostia International Physics Center (DIPC). P.K. 1072 , 20080 Donostia, Euskadi, Spain
| | - M Solà
- Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química, University of Girona , C/ Maria Aurèlia Capmany, 69, 17003 Girona, Catalonia, Spain
| | - J M Ugalde
- Kimika Fakultatea, Euskal Herriko Unibertsitatea, UPV/EHU, and Donostia International Physics Center (DIPC). P.K. 1072 , 20080 Donostia, Euskadi, Spain
| | - X Lopez
- Kimika Fakultatea, Euskal Herriko Unibertsitatea, UPV/EHU, and Donostia International Physics Center (DIPC). P.K. 1072 , 20080 Donostia, Euskadi, Spain
| | - E Matito
- Kimika Fakultatea, Euskal Herriko Unibertsitatea, UPV/EHU, and Donostia International Physics Center (DIPC). P.K. 1072 , 20080 Donostia, Euskadi, Spain.,IKERBASQUE, Basque Foundation for Science , 48013 Bilbao, Euskadi, Spain
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13
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Rodríguez-Mayorga M, Ramos-Cordoba E, Via-Nadal M, Piris M, Matito E. Comprehensive benchmarking of density matrix functional approximations. Phys Chem Chem Phys 2018; 19:24029-24041. [PMID: 28832052 DOI: 10.1039/c7cp03349d] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The energy usually serves as a yardstick in assessing the performance of approximate methods in computational chemistry. After all, these methods are mostly used for the calculation of the electronic energy of chemical systems. However, computational methods should be also aimed at reproducing other properties, such strategy leading to more robust approximations with a wider range of applicability. In this study, we suggest a battery of ten tests with the aim to analyze density matrix functional approximations (DMFAs), including several properties that the exact functional should satisfy. The tests are performed on a model system with varying electron correlation, carrying a very small computational effort. Our results not only put forward a complete and exhaustive benchmark test for DMFAs, currently lacking, but also reveal serious deficiencies of existing approximations that lead to important clues in the construction of more robust DMFAs.
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Affiliation(s)
- Mauricio Rodríguez-Mayorga
- Kimika Fakultatea, Euskal Herriko Unibertsitatea UPV/EHU, and Donostia International Physics Center (DIPC), P.K. 1072, 20080 Donostia, Euskadi, Spain.
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14
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Casalz-Sainz JL, Guevara-Vela JM, Francisco E, Rocha-Rinza T, Martín Pendás Á. Where Does Electron Correlation Lie? Some Answers from a Real Space Partition. Chemphyschem 2017; 18:3553-3561. [DOI: 10.1002/cphc.201700940] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Revised: 10/04/2017] [Indexed: 11/09/2022]
Affiliation(s)
- José Luis Casalz-Sainz
- Departament of Analytical and Physical Chemistry; University of Oviedo; E-33006 Oviedo Spain
| | | | - Evelio Francisco
- Departament of Analytical and Physical Chemistry; University of Oviedo; E-33006 Oviedo Spain
| | - Tomás Rocha-Rinza
- Institute of Chemistry; National Autonomous University of Mexico, Circuito Exterior, Ciudad Universitaria, Delegación Coyoacán C.P.; 04510 Mexico City Mexico
| | - Ángel Martín Pendás
- Departament of Analytical and Physical Chemistry; University of Oviedo; E-33006 Oviedo Spain
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15
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Ramos-Cordoba E, Matito E. Local Descriptors of Dynamic and Nondynamic Correlation. J Chem Theory Comput 2017; 13:2705-2711. [DOI: 10.1021/acs.jctc.7b00293] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Eloy Ramos-Cordoba
- Kimika
Fakultatea, Euskal Herriko Unibertsitatea, UPV/EHU, and Donostia International Physics Center (DIPC), P.K. 1072, 20080 Donostia, Euskadi Spain
| | - Eduard Matito
- Kimika
Fakultatea, Euskal Herriko Unibertsitatea, UPV/EHU, and Donostia International Physics Center (DIPC), P.K. 1072, 20080 Donostia, Euskadi Spain
- IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain
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