1
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Góger S, Karimpour MR, Tkatchenko A. Four-Dimensional Scaling of Dipole Polarizability: From Single-Particle Models to Atoms and Molecules. J Chem Theory Comput 2024; 20:6621-6631. [PMID: 39015013 PMCID: PMC11325554 DOI: 10.1021/acs.jctc.4c00582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/18/2024]
Abstract
Scaling laws enable the determination of physicochemical properties of molecules and materials as a function of their size, density, number of electrons or other easily accessible descriptors. Such relations can be counterintuitive and nonlinear, and ultimately yield much needed insight into quantum mechanics of many-particle systems. In this work, we show on the basis of single-particle models, multielectron atoms and molecules that the dipole polarizability of quantum systems is generally proportional to the fourth power of a characteristic length, computed from the ground-state wave function. This four-dimensional (4D) scaling is independent of the ratio of bound-to-bound and bound-to-continuum electronic transitions and applies to many-electron atoms when a correlated length metric is used. Finally, this scaling law is applied to predict the polarizability of molecules by electrostatically coupled atoms-in-molecules approach, obtaining approximately 8% absolute and relative accuracy with respect to hybrid density functional theory (DFT) on the QM7-X data set of organic molecules, providing an efficient and scalable model for the anisotropic polarizability tensors of extended (bio)molecules.
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Affiliation(s)
- Szabolcs Góger
- Department of Physics and Materials Science, University of Luxembourg, L-1511 Luxembourg City, Luxembourg
| | - Mohammad Reza Karimpour
- Department of Physics and Materials Science, University of Luxembourg, L-1511 Luxembourg City, Luxembourg
| | - Alexandre Tkatchenko
- Department of Physics and Materials Science, University of Luxembourg, L-1511 Luxembourg City, Luxembourg
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2
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Weber NH, Redfern H, Grimison CC, Lucas JA, Mackie JC, Stockenhuber M, Kennedy EM. Formation of Products of Incomplete Destruction (PID) from the Thermal Oxidative Decomposition of Perfluorooctanoic Acid (PFOA): Measurement, Modeling, and Reaction Pathways. J Phys Chem A 2024; 128:5362-5373. [PMID: 38935631 DOI: 10.1021/acs.jpca.4c01909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/29/2024]
Abstract
The thermal decomposition of perfluorooctanoic acid (PFOA) under oxidative conditions was investigated using air (O2) and N2O as oxidants over temperatures ranging from 400 to 1000 °C in an α-alumina reactor. In the presence of air, PFOA was found to decompose into perfluorohept-1-ene (C7F14) and perfluoroheptanoyl fluoride (C7F14O) in addition to HF, CO, and CO2. At temperatures above 800 °C, both C7F14 and C7F14O were no longer detected. A comprehensive analysis of the reaction mechanisms through quantum chemical analysis and kinetic modeling in combination with experimental observations was utilized to identify key reaction pathways. Quantum chemical analysis led to the conclusion that oxygen atoms are crucial in decomposing perfluoroalk-1-enes, especially the stable perfluorohept-1-ene (C7F14). Under oxidative conditions, it was found that significant quantities of C2F6 and CF4 were formed. Further quantum chemical analysis suggests that the O atoms facilitate the formation of volatile fluorinated compounds (VFCs) such as tetrafluoromethane (CF4) and hexafluoroethane (C2F6), particularly at higher temperatures. By elucidating these key reactions, an improved understanding of the potential formation products of incomplete combustion (PICs) or products of incomplete destruction (PIDs) is made.
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Affiliation(s)
- Nathan H Weber
- Discipline of Chemical Engineering, School of Engineering, University of Newcastle, Callaghan, NSW 2308, Australia
- Oak Ridge Institute for Science and Education, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711, United States
| | - Hayden Redfern
- Discipline of Chemical Engineering, School of Engineering, University of Newcastle, Callaghan, NSW 2308, Australia
| | | | - John A Lucas
- Ventia Services Pty Ltd, North Sydney, NSW 2060, Australia
| | - John C Mackie
- Discipline of Chemical Engineering, School of Engineering, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Michael Stockenhuber
- Discipline of Chemical Engineering, School of Engineering, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Eric M Kennedy
- Discipline of Chemical Engineering, School of Engineering, University of Newcastle, Callaghan, NSW 2308, Australia
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3
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Cappelletti D, Falcinelli S, Pirani F. The dawn of hydrogen and halogen bonds and their crucial role in collisional processes probing long-range intermolecular interactions. Phys Chem Chem Phys 2024; 26:7971-7987. [PMID: 38411471 DOI: 10.1039/d3cp05871a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2024]
Abstract
This perspective review focuses on the results of an internally consistent study developed in the Perugia laboratory, centered on the fundamental interaction components that, at large intermolecular distances, determine the formation of weak intermolecular hydrogen (HB) and halogen (XB) bonds. This investigation exploits old and novel molecular beam scattering experiments involving several gaseous prototypical systems. In particular, we focus on the kinetic energy dependence of the total (elastic + inelastic) integral cross-sections. Of particular interest is the measure of quantum interference patterns in the energy dependence of cross-sections of targeted systems and their shift compared to that of known reference systems. We interpreted these findings as interaction energy stabilization components, such as charge transfer, σ-hole, and polar flattening, that emerge at intermediate separation distance ranges and selectively manifest for specific geometries of collision complexes. Another significant observable we discuss is the absolute value of the cross-section and its dependence on permanent multipole moments of the collisional partners. Specifically, we show how the spontaneous orientation of rotationally cold and polar molecules, due to the electric field gradient associated with the interaction between permanent multipole moments, can significantly modify the magnitude of the total cross-section, even at high values of the impact parameter. We are confident that the present results can help extend the force field formulation to various interacting systems and carry out molecular dynamics simulations under conditions of application interest.
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Affiliation(s)
- David Cappelletti
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, via Elce di Sotto 8, 06123 Perugia, Italy.
| | - Stefano Falcinelli
- Dipartimento di Ingegneria Civile ed Ambientale, Università degli Studi di Perugia, via G. Duranti 93, 06215 Perugia, Italy
| | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, via Elce di Sotto 8, 06123 Perugia, Italy.
- Dipartimento di Ingegneria Civile ed Ambientale, Università degli Studi di Perugia, via G. Duranti 93, 06215 Perugia, Italy
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4
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Rutigliano M, Pirani F. The Sticking of N 2 on W(100) Surface: An Improvement in the Description of the Adsorption Dynamics Further Reconciling Theory and Experiment. Molecules 2023; 28:7546. [PMID: 38005267 PMCID: PMC10673241 DOI: 10.3390/molecules28227546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 11/07/2023] [Accepted: 11/10/2023] [Indexed: 11/26/2023] Open
Abstract
The adsorption of nitrogen molecules on a (100) tungsten surface has been studied using a new potential energy surface in which long-range interactions are suitably characterized and represented by the Improved Lennard-Jones function. The new potential energy surface is used to carry out molecular dynamics simulations by adopting a semiclassical collisional method that explicitly includes the interaction with the surface phonons. The results of the sticking probability, evaluated as a function of the collision energy, are in good agreement with those obtained in the experiments and improve the already good comparison recently obtained with calculations performed using interactions from the Density Functional Theory method and corrected for long-range van der Waals contributions. The dependence of trapping probability on the surface temperature for a well-defined collision energy has also been investigated.
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Affiliation(s)
- Maria Rutigliano
- Istituto per la Scienza e Tecnologia dei Plasmi (ISTP), Consiglio Nazionale delle Ricerche (CNR), Via Amendola 122/D, 70126 Bari, Italy
| | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy;
- Dipartimento di Ingegneria Civile ed Ambientale, Università di Perugia, Via G. Duranti 93, 06125 Perugia, Italy
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5
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de Jesus GCC, Costa CVS, de Macedo LGM, de Oliveira Neto PH, Pirani F, Gargano R. Electronic and dynamical properties of non-covalent diatomic aggregates formed by He with neutral and ionic Li and Be. J Mol Model 2023; 29:190. [PMID: 37249738 DOI: 10.1007/s00894-023-05512-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 03/13/2023] [Indexed: 05/31/2023]
Abstract
CONTEXT AND RESULTS This work aims to study the influence of the absence and presence of permanent charges on the electronic and dynamical properties of the non-covalent bound diatomic systems involving He and Li, Be as neutral and ionic partners. The charge displacement results suggest that in the formation of HeLi[Formula: see text], HeBe[Formula: see text], and HeBe[Formula: see text], the neutral He atom undergoes, in the electric field of the ion, a pronounced electronic polarization, and the natural bond order theoretical approach indicates that in the formation of the molecular orbital He acts as a weak electron donor. The energy decomposition analysis provides the dispersion and induction components as the attractive leading terms controlling the stability of all systems, confirming that the formed bond substantially maintains a non-covalent nature which is also supported by the Quantum Theory of Atoms in Molecules (QTAIM) analysis. Finally, it was found that the HeLi and HeBe neutral systems are unstable under any condition, HeLi[Formula: see text] and HeBe[Formula: see text] ionic systems are stable below 317K and 138K, respectively, while the HeBe[Formula: see text] system becomes unstable only after 3045K. COMPUTATIONAL AND THEORETICAL TECHNIQUES The potential energy curves and interactions in all systems were studied theoretically based on coupled-cluster singles and doubles method with perturbative inclusion of triples CCSD(T) method with an aug-cc-pV5Z basis set. More precisely, it was determined the potential energy curves describing the stability of the HeLi, HeLi[Formula: see text], HeBe, HeBe[Formula: see text], and HeBe[Formula: see text] systems, the charge displacement within the formed adducts, the decomposition of their total interaction energy, the topological analysis of their bonds, their rovibrational energies, their spectroscopic constants and lifetimes.
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Affiliation(s)
| | - Caio Vinícius Sousa Costa
- Instituto de Física, Universidade de Brasília (UnB), P.O. Box 04455, Brasília, DF, 70919-970, Brazil
| | | | | | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli studi di Perugia, via Elce di Sotto 8, Perugia, Italy
- Dipartimento di Ingegneria Civile ed Ambientale, Università di Perugia, via Duranti 93, 06125, Perugia, Italy
| | - Ricardo Gargano
- Instituto de Física, Universidade de Brasília (UnB), P.O. Box 04455, Brasília, DF, 70919-970, Brazil
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6
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Costa CVS, de Jesus GCC, de Macedo LGM, Pirani F, Gargano R. A Detailed Study of Electronic and Dynamic Properties of Noble Gas-Oxygen Molecule Adducts. Molecules 2022; 27:7409. [PMID: 36364235 PMCID: PMC9654831 DOI: 10.3390/molecules27217409] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 10/20/2022] [Accepted: 10/21/2022] [Indexed: 09/08/2024] Open
Abstract
In this work, the binding features of adducts formed by a noble gas (Ng = He, Ne, Ar, Kr, Xe, and Rn) atom and the oxygen molecule (O2) in its ground Σg-3, in the past target of several experimental studies, have been characterized under different theoretical points of view to clarify fundamental aspects of the intermolecular bond. For the most stable configuration of all Ng-O2 systems, binding energy has been calculated at the theory's CCSD(T)/aug-cc-pVTZ level and compared with the experimental findings. Rovibrational energies, spectroscopic constants, and lifetime as a function of temperature were also evaluated by adopting properly formulated potential energy curves. The nature of the interaction involved was deeply investigated using charge displacement analysis, symmetry-adapted perturbation theory (SAPT), and natural bond orbital (NBO) methods. In all adducts, it was found that the charge transfer plays a minor role, although O2 is an open shell species exhibiting a positive electron affinity. Obtained results also indicate that the dispersion attraction contribution is the main responsible for the complex stability.
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Affiliation(s)
| | | | | | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Universitá degli studi di Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
- Istituto CNR di Scienze e Tecnologie Chimiche (CNR-SCITEC), Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Ricardo Gargano
- Instituto de Física, Universidade de Brasília, Brasília 70297-400, DF, Brazil
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García-Arroyo E, Campos-Martínez J, Bartolomei M, Pirani F, Hernández MI. Molecular hydrogen isotope separation by a graphdiyne membrane: a quantum-mechanical study. Phys Chem Chem Phys 2022; 24:15840-15850. [PMID: 35726662 DOI: 10.1039/d2cp01044e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Graphdiyne (GDY) has emerged as a very promising two-dimensional (2D) membrane for gas separation technologies. One of the most challenging goals is the separation of deuterium (D2) and tritium (T2) from a mixture with the most abundant hydrogen isotope, H2, an achievement that would be of great value for a number of industrial and scientific applications. In this work we study the separation of hydrogen isotopes in their transport through a GDY membrane due to mass-dependent quantum effects that are enhanced by the confinement provided by its intrinsic sub-nanometric pores. A reliable improved Lennard-Jones force field, optimized on accurate ab initio calculations, has been built to describe the molecule-membrane interaction, where the molecule is treated as a pseudoatom. The quantum dynamics of the molecules impacting on the membrane along a complete set of incidence directions have been rigorously addressed by means of wave packet calculations in the 3D space, which have allowed us to obtain transmission probabilities and, in turn, permeances, as the thermal average of the molecular flux per unit pressure. The effect of the different incidence directions on the probabilities is analyzed in detail and it is concluded that restricting the simulations to a perpendicular incidence leads to reasonable results. Moreover, it is found that a simple 1D model-using a zero-point energy-corrected interaction potential-provides an excellent agreement with the 3D probailities for perpendicular incidence conditions. Finally, D2/H2 and T2/H2 selectivities are found to reach maximum values of about 6 and 21 at ≈50 and 45 K, respectively, a feature due to a balance between zero-point energy and tunneling effects in the transport dynamics. Permeances at these temperatures are below recommended values for practical applications, however, at slightly higher temperatures (77 K) they become acceptable while the selectivities preserve promising values, particularly for the separation of tritium.
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Affiliation(s)
- Esther García-Arroyo
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas (IFF-CSIC), Serrano 123, 28006 Madrid, Spain. .,Doctoral Programme in Condensed Matter Physics, Nanoscience and Biophysics, Doctoral School Universidad Autónoma de Madrid, Spain
| | - José Campos-Martínez
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas (IFF-CSIC), Serrano 123, 28006 Madrid, Spain.
| | - Massimiliano Bartolomei
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas (IFF-CSIC), Serrano 123, 28006 Madrid, Spain.
| | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, Perugia, Italy
| | - Marta I Hernández
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas (IFF-CSIC), Serrano 123, 28006 Madrid, Spain.
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8
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Marchione D, Mancini L, Liang P, Vanuzzo G, Pirani F, Skouteris D, Rosi M, Casavecchia P, Balucani N. Unsaturated Dinitriles Formation Routes in Extraterrestrial Environments: A Combined Experimental and Theoretical Investigation of the Reaction between Cyano Radicals and Cyanoethene (C 2H 3CN). J Phys Chem A 2022; 126:3569-3582. [PMID: 35640168 PMCID: PMC9189926 DOI: 10.1021/acs.jpca.2c01802] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
The reaction between
cyano radicals (CN, X2Σ+) and cyanoethene
(C2H3CN) has been
investigated by a combined approach coupling crossed molecular beam
(CMB) experiments with mass spectrometric detection and time-of-flight
analysis at a collision energy of 44.6 kJ mol–1 and
electronic structure calculations to determine the relevant potential
energy surface. The experimental results can be interpreted by assuming
the occurrence of a dominant reaction pathway leading to the two but-2-enedinitrile
(1,2-dicyanothene) isomers (E- and Z-NC–CH=CH–CN) in a H-displacement channel and,
to a much minor extent, to 1,1-dicyanoethene, CH2C(CN)2. In order to derive the product branching ratios under the
conditions of the CMB experiments and at colder temperatures, including
those relevant to Titan and to cold interstellar clouds, we have carried
out RRKM statistical calculations using the relevant potential energy
surface of the investigated reaction. We have also estimated the rate
coefficient at very low temperatures by employing a semiempirical
method for the treatment of long-range interactions. The reaction
has been found to be barrierless and fast also under the low temperature
conditions of cold interstellar clouds and the atmosphere of Titan.
Astrophysical implications and comparison with literature data are
also presented. On the basis of the present work, 1,2-dicyanothene
and 1,1-dicyanothene are excellent candidates for the search of dinitriles
in the interstellar medium.
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Affiliation(s)
- Demian Marchione
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, 06123 Perugia, Italy
| | - Luca Mancini
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, 06123 Perugia, Italy
| | - Pengxiao Liang
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, 06123 Perugia, Italy
| | - Gianmarco Vanuzzo
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, 06123 Perugia, Italy
| | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, 06123 Perugia, Italy
| | | | - Marzio Rosi
- Dipartimento di Ingegneria Civile ed Ambientale, Università degli Studi di Perugia, 06125 Perugia, Italy
| | - Piergiorgio Casavecchia
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, 06123 Perugia, Italy
| | - Nadia Balucani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, 06123 Perugia, Italy
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9
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Potential Energy Surfaces for Noble Gas (Ar, Kr, Xe, Rn)–Propylene Oxide Systems: Analytical Formulation and Binding. Symmetry (Basel) 2022. [DOI: 10.3390/sym14020249] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Multidimensional potential energy surfaces for heavy noble gas–propylene oxide systems are obtained by applying the phenomenological method successfully used to describe homologous systems involving He and Ne atoms. Such potential energy surfaces, where the interaction exclusively arises from the anisotropic van der Waals interaction components, are given in an analytical form. Therefore, they can be easily used as force fields to carry out molecular simulations to evaluate spectroscopic features and the dynamical selectivity of weakly bound complexes formed by propylene oxide (a prototype chiral species) with a noble gas atom (a prototype isotropic partner) by two-body collisions under a variety of conditions. Several potential energy minima are identified on the surfaces, which are confirmed and characterized by high level ab initio calculations. The next step to further generalize this methodology is its extension to systems involving propylene oxide-diatomic molecules (as H2, O2 and N2), as well as to propylene oxide dimers.
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10
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Zunzunegui-Bru E, Gruber E, Bergmeister S, Meyer M, Zappa F, Bartolomei M, Pirani F, Villarreal P, González-Lezana T, Scheier P. Helium structures around SF 5+ and SF 6+: novel intermolecular potential and mass spectrometry experiments. Phys Chem Chem Phys 2022; 24:2004-2014. [PMID: 35022639 PMCID: PMC8790812 DOI: 10.1039/d1cp04725f] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Helium clusters around the recently experimentally observed sulphur hexafluoride SF6+ and sulphur pentafluoride SF5+ ions are investigated using a combined experimental and theoretical effort. Mass spectrometry ion yields are obtained and the energetics and structure of the corresponding HeN–SF6+ and HeN–SF5+ clusters are analyzed using path integral molecular dynamics calculations as a function of N, the number of He atoms, employing a new intermolecular potential describing the interaction between the dopant and the surrounding helium. The new force field is optimized on benchmark potential energy ab initio calculations and represented by improved Lennard-Jonnes analytical expressions. This procedure improves the previous potentials employed in similar simulations for neutral SF6 attached to helium nanodroplets. The theoretical analysis explains the characteristic features observed in the experimental ion yields which suggest the existence of stable configurations at specific sizes. The structure of the He atoms around SF5+ and SF6+ is investigated both experimentally and theoretically.![]()
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Affiliation(s)
- Eva Zunzunegui-Bru
- Instituto de Física Fundamental, IFF-CSIC, Serrano 123, 28006 Madrid, Spain.
| | - Elisabeth Gruber
- Universität Innsbruck, Institut für Ionenphysik und Angewandte Physik, Technikerstraße 25, 6020 Innsbruck, Austria
| | - Stefan Bergmeister
- Universität Innsbruck, Institut für Ionenphysik und Angewandte Physik, Technikerstraße 25, 6020 Innsbruck, Austria
| | - Miriam Meyer
- Universität Innsbruck, Institut für Ionenphysik und Angewandte Physik, Technikerstraße 25, 6020 Innsbruck, Austria
| | - Fabio Zappa
- Universität Innsbruck, Institut für Ionenphysik und Angewandte Physik, Technikerstraße 25, 6020 Innsbruck, Austria
| | | | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Universitá di Perugia, 06123 Perugia, Italy
| | - Pablo Villarreal
- Instituto de Física Fundamental, IFF-CSIC, Serrano 123, 28006 Madrid, Spain.
| | | | - Paul Scheier
- Universität Innsbruck, Institut für Ionenphysik und Angewandte Physik, Technikerstraße 25, 6020 Innsbruck, Austria
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Zhang RM, Chen W, Truhlar DG, Xu X. Master Equation Study of Hydrogen Abstraction from HCHO by OH Via a Chemically Activated Intermediate. Faraday Discuss 2022; 238:431-460. [DOI: 10.1039/d2fd00024e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The abstraction reaction of hydrogen from formaldehyde by OH radical plays an important role in formaldehyde oxidation. The reaction involves a bimolecular association to form a chemically activated hydrogen-bonded reaction...
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12
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Zhang Y, Cheng Y, Zhang T, Wang R, Ji J, Xia Y, Makroni L, Wang Z, M B. A computational study of the HO2 + SO3 → HOSO2 + 3O2 reaction catalyzed by water monomer, water dimer and small clusters of sulfuric acid: kinetics and atmospheric implications. Phys Chem Chem Phys 2022; 24:18205-18216. [DOI: 10.1039/d1cp03318b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, the reaction mechanisms and kinetics for the HO2 + SO3 → HOSO2 + 3O2 reaction catalyzed by water monomer, water dimer and small clusters of sulfuric acid have been...
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13
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Editorial for the Special Issue on Long-range Intermolecular Interactions in Chemistry and Physics (in honour of Prof. Fernando Pirani). Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2021.139190] [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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14
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Palazzetti F, Cappelletti D, Coletti C, Falcinelli S, Pirani F. Molecular beam scattering experiments on noble gas-propylene oxide: Total integral cross sections and potential energy surfaces of He- and Ne-C 3H 6O. J Chem Phys 2021; 155:234301. [PMID: 34937350 DOI: 10.1063/5.0073737] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
The interactions of He and Ne with propylene oxide have been investigated with the molecular beam technique by measuring the total (elastic + inelastic) integral cross section as a function of collision velocity. Starting from the analysis of these experimental data, potential energy surfaces, formulated as a function of the separation distance and orientation of propylene oxide with respect to the interacting partners, have been built: The average depth of potential wells (located at intermediate separation distances) has been characterized by analyzing the observed "glory" quantum effects, and the strength of long-range attractions has been obtained from the magnitude and the velocity dependence of the smooth component of measured cross sections. The surfaces, tested and improved against new ab initio calculations of minima interaction energies at the complete basis set level of theory, are defined in the full space of relative configurations. This represents a crucial condition to provide force fields useful to carry out, in general, important molecular property simulations and to evaluate, in the present case, the spectroscopic features and the dynamical selectivity of weakly bound complexes formed by propylene oxide, a prototype chiral species, during collisions in interstellar clouds and winds, in the space and planetary atmospheres. The adopted formulation of the interaction can be readily extended to similar systems, involving heavier noble gases or diatomic molecules (H2, O2, and N2) as well as to propylene oxide dimers.
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Affiliation(s)
- Federico Palazzetti
- Dipartimento di Chimica, Biologia e Biotecnologie - Università degli Studi di Perugia, Perugia, Italy
| | - David Cappelletti
- Dipartimento di Chimica, Biologia e Biotecnologie - Università degli Studi di Perugia, Perugia, Italy
| | - Cecilia Coletti
- Dipartimento di Farmacia, Università degli Studi "G. D'Annunzio" Chieti-Pescara, Chieti, Italy
| | - Stefano Falcinelli
- Dipartimento di Ingegneria Civile ed Ambientale, Università degli Studi di Perugia, Perugia, Italy
| | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie - Università degli Studi di Perugia, Perugia, Italy
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15
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Pomogaeva AV, Timoshkin AY. Influence of the solvent on the Lewis acidity of antimony pentahalides and group 13 Lewis acids toward acetonitrile and pyridine. J Comput Chem 2021; 42:1792-1802. [PMID: 34227137 DOI: 10.1002/jcc.26713] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 06/07/2021] [Accepted: 06/08/2021] [Indexed: 11/05/2022]
Abstract
Energetic effects of solvation of SbF5 , SbCl5 , and 21 group 13 Lewis acids (LA) and their molecular complexes with acetonitrile and pyridine are evaluated using SMD approach. Compared to the gas phase, solvation increases the stability of boron- and aluminum-containing complexes but decreases the stability of gallium and indium-containing homologs due to larger solation energies of free LA. New Lewis acidity scales, based on the Gibbs energy of dissociation of the molecular complexes LA·pyridine and LA·acetonitrile in the gas phase, in benzene and acetonitrile solutions, are proposed.
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Affiliation(s)
- Anna V Pomogaeva
- Institute of Chemistry, St. Petersburg State University, St. Petersburg, Russian Federation
| | - Alexey Y Timoshkin
- Institute of Chemistry, St. Petersburg State University, St. Petersburg, Russian Federation
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16
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Loukhovitski BI, Sharipov AS. Molecular Collision Diameters and Electronic Polarizabilities: Inherent Relationship and Fast Evaluation. J Phys Chem A 2021; 125:5117-5123. [PMID: 34077208 DOI: 10.1021/acs.jpca.1c02201] [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
The collision diameter σ for a large set of molecular species is related to the static electronic polarizability αel. A remarkable correlation between these quantities conceptually similar to the analogous one previously identified for atoms is revealed. Our recommended model is the function σ(αel) = p1 + p2αel1/3, where p1 = 0.768 Å and p2 = 2.168 are the fitting parameters providing the best overall match to the reference data for collision diameter (181 data points). The obtained correlation allows one to easily find the collision diameter of molecules from the known polarizability and vice versa. These findings can be useful for many applications, where there is a need for inexpensive assessments of the collision diameters or electronic polarizabilities, for example, when developing the transport property databases for modeling of chemically reacting flows.
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Bartolomei M, Hernández MI, Campos-Martínez J, García-Arroyo E, Hernández-Rojas J, Pirani F, Arteaga-Gutiérrez K. Rare gas-naphthalene interaction: Intermolecular potentials and clusters’ structures. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138565] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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18
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Rutigliano M, Pirani F. The role of long-range interactions on the selectivity of gaseous molecule-surface scattering. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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19
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Ferreira de Menezes R, Machado de Macedo LG, Lopes Martins JB, Pirani F, Gargano R. Investigation of strength and nature of the weak intermolecular bond in NH2 radical-noble gas atom adducts and evaluation of their basic spectroscopic features. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138386] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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20
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Carvalho FM, Kiametis AS, de Araújo Oliveira AL, Pirani F, Gargano R. Spectroscopy, lifetime, and charge-displacement of the methanol-noble gas complexes: An integrated experimental-theoretical investigation. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 246:119049. [PMID: 33080517 DOI: 10.1016/j.saa.2020.119049] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 09/08/2020] [Accepted: 10/02/2020] [Indexed: 05/26/2023]
Abstract
An integrated experimental-theoretical investigation was employed to determine rovibrational energies, spectroscopic constants, lifetime as a function of temperature in gas phase complexes of methanol with noble gas (NgHe, Ne, Ar, Kr, Xe, and Rn). Beside that, a parallel effort has been addressed to theoretically characterize the nature of intermolecular interactions determining the dissociation energy and equilibrium distance of the formed adducts. Dynamics and lifetime results reveal that, except for the CH3OH-He aggregate, all other methanol-Ng compounds are sufficiently stable under thermal conditions. Their lifetimes are larger than 1 ps for the temperature of the bulk in the range between 200 and 500 K. In addition, the current lifetime results suggest that the aggregates formed by methanol and Ng are globally more stable than corresponding complexes formed by water with Ng. From the point of view of the CCSD(T)/aug-cc-pVTZ level calculation, in all compounds, the electron densities of Ng partners are weakly polarized in the presence of CH3OH molecule. The charge-displacement curves and NBO analysis indicate that the charge transfer from Ng to methanol molecule, in general, plays a minor role, being appreciable only in the aggregate involving Ar. Finally, it was verified from the SAPT2 + (CCD)-δMP2/aug-cc-pVTZ calculations and NCI analysis that the dispersion is the essential long-range attractive contribution to the interaction energy for all studied complexes. This feature strongly suggests that these compounds are held bonded substantially by van der Waals forces. Then non-covalent intermolecular bonds are effectively formed in the gas phase, which is disturbed by small stabilizing charge-transfer contributions.
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Affiliation(s)
- Fernando M Carvalho
- Institute of Physics, University of Braslia, Campus Darcy Ribeiro, Braslia, DF, Brazil
| | | | | | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Universitá degli studi di Perugia, via Elce di Sotto 8, Perugia, Italy; Istituto CNR di Scienze e Tecnologie Chimiche (CNR-SCITEC), via Elce di Sotto 8, Perugia, Italy
| | - Ricardo Gargano
- Institute of Physics, University of Braslia, Campus Darcy Ribeiro, Braslia, DF, Brazil.
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21
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Mirahmadi M, Pérez-Ríos J. On the formation of van der Waals complexes through three-body recombination. J Chem Phys 2021; 154:034305. [PMID: 33499624 DOI: 10.1063/5.0039610] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In this work, we show that van der Waals molecules X-RG (where RG is the rare gas atom) may be created through direct three-body recombination collisions, i.e., X + RG + RG → X-RG + RG. In particular, the three-body recombination rate at temperatures relevant for buffer gas cell experiments is calculated via a classical trajectory method in hyperspherical coordinates [Pérez-Ríos et al., J. Chem. Phys. 140, 044307 (2014)]. As a result, it is found that the formation of van der Waals molecules in buffer gas cells (1 K ≲ T ≲ 10 K) is dominated by the long-range tail (distances larger than the LeRoy radius) of the X-RG interaction. For higher temperatures, the short-range region of the potential becomes more significant. Moreover, we notice that the rate of formation of van der Walls molecules is of the same order of the magnitude independent of the chemical properties of X. As a consequence, almost any X-RG molecule may be created and observed in a buffer gas cell under proper conditions.
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Affiliation(s)
- Marjan Mirahmadi
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Jesús Pérez-Ríos
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
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22
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de Araujo Oliveira AL, de Macedo LGM, de Oliveira Só YA, Martins JBL, Pirani F, Gargano R. Nature and role of the weak intermolecular bond in enantiomeric conformations of H 2O 2–noble gas adducts: a chiral prototypical model. NEW J CHEM 2021. [DOI: 10.1039/d0nj06135b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The role and nature of the weak intermolecular bond in the H2O2–noble gas enantiomeric conformations are presented. Charge transfer associated with the formation of a weak intermolecular hydrogen bond tends to stabilize the cis-barrier conformation.
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Affiliation(s)
| | | | | | | | - Fernando Pirani
- Dipartimento di Chimica
- Biologia e Biotecnologie
- Universitá degli Studi di Perugia
- Perugia
- Italy
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23
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Nunzi F, Pannacci G, Tarantelli F, Belpassi L, Cappelletti D, Falcinelli S, Pirani F. Leading Interaction Components in the Structure and Reactivity of Noble Gases Compounds. Molecules 2020; 25:molecules25102367. [PMID: 32443725 PMCID: PMC7287633 DOI: 10.3390/molecules25102367] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 05/15/2020] [Accepted: 05/19/2020] [Indexed: 12/12/2022] Open
Abstract
The nature, strength, range and role of the bonds in adducts of noble gas atoms with both neutral and ionic partners have been investigated by exploiting a fine-tuned integrated phenomenological–theoretical approach. The identification of the leading interaction components in the noble gases adducts and their modeling allows the encompassing of the transitions from pure noncovalent to covalent bound aggregates and to rationalize the anomalous behavior (deviations from noncovalent type interaction) pointed out in peculiar cases. Selected adducts affected by a weak chemical bond, as those promoting the formation of the intermolecular halogen bond, are also properly rationalized. The behavior of noble gas atoms excited in their long-life metastable states, showing a strongly enhanced reactivity, has been also enclosed in the present investigation.
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Affiliation(s)
- Francesca Nunzi
- Dipartimento di Chimica, Biologia e Biotecnologie, via Elce di Sotto 8, I-06123 Perugia, Italy; (G.P.); (F.T.); (D.C.)
- Istituto CNR di Scienze e Tecnologie Chimiche “Giulio Natta” (CNR-SCITEC), via Elce di Sotto, I-06123 Perugia, Italy;
- Correspondence: (F.N.); (F.P.)
| | - Giacomo Pannacci
- Dipartimento di Chimica, Biologia e Biotecnologie, via Elce di Sotto 8, I-06123 Perugia, Italy; (G.P.); (F.T.); (D.C.)
| | - Francesco Tarantelli
- Dipartimento di Chimica, Biologia e Biotecnologie, via Elce di Sotto 8, I-06123 Perugia, Italy; (G.P.); (F.T.); (D.C.)
- Istituto CNR di Scienze e Tecnologie Chimiche “Giulio Natta” (CNR-SCITEC), via Elce di Sotto, I-06123 Perugia, Italy;
| | - Leonardo Belpassi
- Istituto CNR di Scienze e Tecnologie Chimiche “Giulio Natta” (CNR-SCITEC), via Elce di Sotto, I-06123 Perugia, Italy;
| | - David Cappelletti
- Dipartimento di Chimica, Biologia e Biotecnologie, via Elce di Sotto 8, I-06123 Perugia, Italy; (G.P.); (F.T.); (D.C.)
| | - Stefano Falcinelli
- Dipartimento di Ingegneria Civile ed Ambientale, Università degli Studi di Perugia, via G. Duranti 93, 06215 Perugia, Italy;
| | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, via Elce di Sotto 8, I-06123 Perugia, Italy; (G.P.); (F.T.); (D.C.)
- Istituto CNR di Scienze e Tecnologie Chimiche “Giulio Natta” (CNR-SCITEC), via Elce di Sotto, I-06123 Perugia, Italy;
- Correspondence: (F.N.); (F.P.)
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24
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Mackie JC, Kennedy EM. Pyrolysis of Glyphosate and Its Toxic Products. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:13742-13747. [PMID: 31670504 DOI: 10.1021/acs.est.9b04983] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
With health concerns developing about the use of glyphosate (phosphonomethylglycine, PMG), the world's most used herbicide, the possibility of destruction of stockpiles via incineration arises. Little is known, however, about the possible toxic products of decomposition. We have performed a quantum chemical computation of the mechanism of thermal decomposition of PMG. Two initiation channels, one producing sarcosine and the other producing N-methylaminomethylphosphonic acid, have been located. Both the initial products decompose to dimethylamine (DMA), and the mechanism of further decomposition and toxic products is explored. Global potential energy surfaces for the initial decomposition of DMA are presented together with chemical kinetic modeling wherein the rate constants employed have been calculated from the quantum chemical data. Time and temperature evolution of the expected toxic products are presented and discussed.
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Affiliation(s)
- John C Mackie
- Process Safety and Environmental Protection Group, School of Engineering , The University of Newcastle , Callaghan , New South Wales 2308 , Australia
| | - Eric M Kennedy
- Process Safety and Environmental Protection Group, School of Engineering , The University of Newcastle , Callaghan , New South Wales 2308 , Australia
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25
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Sharipov AS, Loukhovitski BI. Small atomic clusters: quantum chemical research of isomeric composition and physical properties. Struct Chem 2019. [DOI: 10.1007/s11224-019-01417-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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26
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Litinas I, Koutselos AD. Structure Distribution of Gaseous Ions in Strong Electrostatic Fields. J Phys Chem A 2019; 123:5683-5691. [PMID: 31250648 DOI: 10.1021/acs.jpca.9b03441] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In drift tube experiments, where ions move in gases under the action of an electrostatic field, collision excitation is implemented for the study of the energy partitioning in the molecular degrees of freedom and the corresponding relaxation rates when the excitation is turned off. In the case of flexible ions, the vibration modes related to metastable molecular structures have been activated in ion mobility spectrometry and their population has been probed with respect to the field strength and the gas temperature. Here, we study the angular vibrational excitation and relaxation of such systems by examining the motion of molecular ions with one bending mode at strong fields using a nonequilibrium molecular dynamics simulation method. The relatively stable structures are introduced through the use of an intramolecular angular potential with minima at the position of the most stable conformations. We calculate the first few moments of the velocity and angular velocity distribution functions as well as the distribution of the conformers, and find that they follow unified curves when plotted with respect to the relative ion-atom collision energy. At high field strengths, the angular vibration is excited and a portion of the ions interchanges conformations continuously in time with the populations of the molecular structures to attain limiting values. In addition, orientational alignment, with the perpendicular angular momentum being greater than the one parallel to the field, is observed. Our observations, although based on a specific system, must be rather general for the case of large flexible molecular ions.
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Affiliation(s)
- Iraklis Litinas
- Department of Chemistry, Physical Chemistry Laboratory , National and Kapodistrian University of Athens , Panepistimiopolis, 15771 Athens , Greece
| | - Andreas D Koutselos
- Department of Chemistry, Physical Chemistry Laboratory , National and Kapodistrian University of Athens , Panepistimiopolis, 15771 Athens , Greece
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27
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Cappelletti D, Cinti A, Nicoziani A, Falcinelli S, Pirani F. Molecular Beam Scattering Experiments as a Sensitive Probe of the Interaction in Bromine-Noble Gas Complexes. Front Chem 2019; 7:320. [PMID: 31157202 PMCID: PMC6534045 DOI: 10.3389/fchem.2019.00320] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Accepted: 04/23/2019] [Indexed: 01/31/2023] Open
Abstract
This paper reports for the first time molecular beam experiments for the scattering of He, Ne, and Ar by the Br2 molecule, with the aim of probing in detail the intermolecular interaction. Measurements have been performed under the experimental condition to resolve the glory pattern, a quantum interference effect observable in the collision velocity dependence of the integral cross section. We analyzed the experimental data with a reliable potential model defined as a combination of an anisotropic van der Waals component with the additional contribution due to charge transfer and polar flattening effects related to the formation of an intermolecular halogen bond. The model involves few parameters, whose values are related to fundamental physical properties of the interacting partners, and it allows an internally consistent comparison of the stability of the gas-phase adducts formed by Br2 moiety with different noble gases as well as homologous complexes with the Cl2 molecule. The same model appears to be also easily generalized to describe the interaction of diatomic halogen molecules in the excited B(3Π) electronic state where the halogen bond contribution tends to vanish and more anisotropic van der Waals components dominate the structure of the complexes with noble gases.
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Affiliation(s)
- David Cappelletti
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, Perugia, Italy
| | - Antonio Cinti
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, Perugia, Italy
| | - Andrea Nicoziani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, Perugia, Italy
| | - Stefano Falcinelli
- Dipartimento di Ingegneria Civile ed Ambientale, Università degli Studi di Perugia, Perugia, Italy
| | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, Perugia, Italy
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28
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Dynamics and spectroscopy of van der Waals complexes composed of ammonia and noble gases. J Mol Model 2019; 25:126. [PMID: 31020415 DOI: 10.1007/s00894-019-4023-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2018] [Accepted: 03/29/2019] [Indexed: 10/26/2022]
Abstract
In this work, we calculate the rovibrational energies and spectroscopic constants for the systems formed by ammonia (NH3) and noble gases (Ng=He, Ne, Ar, Kr and Xe). For the spectroscopic constant calculations, we used two different methods: Dunham and another one that use rovibrational energies (here calculated by discrete variable method). In both cases, we used the improved Lennard-Jones potential energy curves (PECs). These PECs, which describe very well van der Waals systems, were built using the dissociation and equilibrium distance obtained from experiments of crossed molecular beams. The spectroscopic constant results, obtained by both methods were in excellent agreement with each other for all NH3-Ng studied systems. Also in relation to NH3-He system, we realize that although this system has a relatively small dissociation energy, it has one vibrational level. Finally, the spectroscopic constants and fundamental rovibrational energy results were used to verify the stability of each system through the lifetime decomposition.
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Bystrov N, Emelianov A, Eremin A, Loukhovitski B, Sharipov A, Yatsenko P. Direct measurements of C3
F7
I dissociation rate constants using a shock tube ARAS technique. INT J CHEM KINET 2018. [DOI: 10.1002/kin.21244] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Nikita Bystrov
- Joint Institute for High Temperatures of the Russian Academy of Sciences; Moscow Russia
- Bauman Moscow State Technical University; Moscow Russia
| | - Alexander Emelianov
- Joint Institute for High Temperatures of the Russian Academy of Sciences; Moscow Russia
| | - Alexander Eremin
- Joint Institute for High Temperatures of the Russian Academy of Sciences; Moscow Russia
| | | | | | - Pavel Yatsenko
- Joint Institute for High Temperatures of the Russian Academy of Sciences; Moscow Russia
- Bauman Moscow State Technical University; Moscow Russia
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30
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Nunzi F, Cesario D, Pirani F, Belpassi L, Tarantelli F. Modelling Charge Transfer in Weak Chemical Bonds: Insights from the Chemistry of Helium. Chemphyschem 2018. [PMID: 29537704 DOI: 10.1002/cphc.201800051] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
We studied the nature of the interaction of the weakly bound Be-He adduct by means of an integrated theoretical approach based on high-level quantum chemical calculations for the characterization of the potential energy surfaces and charge displaced upon adduct formation, together with the development of a semi-empirical analytical formulation of the interaction potential. Our results show that Be is able to form a stable adduct with He when the Be(1 D) (1s2 2s2 →1s2 2s0 2p2 ) excited state is involved, with a binding energy of as much as 10.2 kcal/mol, an astonishingly large value for He in neutral systems. The analysis of the leading interaction components in the Be*-He adduct proves the relevance of the charge transfer to the overall stability, which contributes to decreasing the intermolecular distance, thus strengthening the induction-energy component.
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Affiliation(s)
- Francesca Nunzi
- Department of Chemistry, Biology and Biotechnology, via Elce di Sotto 8, I-06123, Perugia, Italy.,Istituto di Scienze e Tecnologie Molecolari del CNR (ISTM-CNR), via Elce di Sotto 8, I-06123, Perugia, Italy.,Consortium for Computational Molecular and Materials Sciences (CMS)2, via Elce di Sotto 8, I-06123, Perugia, Italy
| | - Diego Cesario
- Department of Chemistry, Biology and Biotechnology, via Elce di Sotto 8, I-06123, Perugia, Italy
| | - Fernando Pirani
- Department of Chemistry, Biology and Biotechnology, via Elce di Sotto 8, I-06123, Perugia, Italy
| | - Leonardo Belpassi
- Istituto di Scienze e Tecnologie Molecolari del CNR (ISTM-CNR), via Elce di Sotto 8, I-06123, Perugia, Italy.,Consortium for Computational Molecular and Materials Sciences (CMS)2, via Elce di Sotto 8, I-06123, Perugia, Italy
| | - Francesco Tarantelli
- Department of Chemistry, Biology and Biotechnology, via Elce di Sotto 8, I-06123, Perugia, Italy.,Istituto di Scienze e Tecnologie Molecolari del CNR (ISTM-CNR), via Elce di Sotto 8, I-06123, Perugia, Italy.,Consortium for Computational Molecular and Materials Sciences (CMS)2, via Elce di Sotto 8, I-06123, Perugia, Italy
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31
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Mai TVT, Duong MV, Nguyen HT, Huynh LK. Ab initio kinetics of the HOSO 2 + 3O 2 → SO 3 + HO 2 reaction. Phys Chem Chem Phys 2018; 20:6677-6687. [PMID: 29457181 DOI: 10.1039/c7cp07704a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The detailed kinetic mechanism of the HOSO2 + 3O2 reaction, which plays a pivotal role in the atmospheric oxidation of SO2, was investigated using accurate electronic structure calculations and novel statistical thermodynamic/kinetic models. Explored using the accurate composite method W1U, the detailed potential energy surface (PES) revealed that the addition of O2 to a HOSO2 radical to form the adduct (HOSO4) proceeds via a transition state with a slightly positive barrier (i.e., 0.7 kcal mol-1 at 0 K). Such a finding compromises a long-term hypothesis about this channel of being a barrierless process. Moreover, the overall reaction was found to be slightly exothermic by 1.7 kcal mol-1 at 0 K, which is in good agreement with recent studies. On the newly-constructed PES, the temperature- and pressure-dependent behaviors of the title reaction were characterized in a wide range of conditions (T = 200-1000 K & P = 10-760 Torr) using the integrated deterministic and stochastic master equation/Rice-Ramsperger-Kassel-Marcus (ME/RRKM) rate model in which corrections for hindered internal rotation (HIR) and tunneling treatments were included. The calculated numbers were found to be in excellent agreement with literature data. The sensitivity analyses on the derived rate coefficients with respect to the ab initio input parameters (i.e., barrier height and energy transfer) were also performed to further understand the kinetic behaviors of the title reaction. The detailed kinetic mechanism, consisting of thermodynamic and kinetic data (in NASA polynomial and modified Arrhenius formats, respectively), was also provided at different T & P for further use in the modeling/simulation of any related systems.
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Affiliation(s)
- Tam V-T Mai
- Molecular Science and Nano-Materials Lab, Institute for Computational Science and Technology, SBI Building, Quang Trung Software City, Tan Chanh Hiep Ward, District 12, Ho Chi Minh City, Vietnam
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32
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Kurnosov A, Cacciatore M, Pirani F, Laganà A, Martí C, Garcia E. Closer versus Long Range Interaction Effects on the Non-Arrhenius Behavior of Quasi-Resonant O 2 + N 2 Collisions. J Phys Chem A 2017; 121:5088-5099. [PMID: 28598167 DOI: 10.1021/acs.jpca.7b04204] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report in this paper an investigation on energy transfer processes from vibration to vibration and/or translation in thermal and subthermal regimes for the O2 + N2 system performed using quantum-classical calculations on different empirical, semiempirical, and ab initio potential energy surfaces. In particular, the paper focuses on the rationalization of the non-Arrhenius behavior (inversion of the temperature dependence) of the quasi-resonant vibration-to-vibration energy transfer transition rate coefficients at threshold. To better understand the microscopic nature of the involved processes, we pushed the calculations to the detail of the related cross sections and analyzed the impact of the medium and long-range components of the interaction on them. Furthermore, the variation with temperature of the dependence of the quasi-resonant rate coefficient on the vibrational energy gap between initial and final vibrational states and the effectiveness of quantum-classical calculations to overcome the limitations of the purely classical treatments were also investigated. These treatments, handled in an open molecular science fashion by chaining data and competencies of the various laboratories using a grid empowered molecular simulator, have allowed a rationalization of the dependence of the computed rate coefficients in terms of the distortion of the O2-N2 configuration during the diatom-diatom collisions. A way of relating such distortions to a smooth and continuous progress variable, allowing a proper evolution from both long to closer range formulation of the interaction and from its entrance to exit channel (through the strong interaction region) relaxed graphical representations, is also discussed in the paper.
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Affiliation(s)
- A Kurnosov
- Troitsk Institute of Innovation and Fusion Research , 142092 Troitsk, Moscow, Russia
| | - M Cacciatore
- Nanotec-Institute for Nanotechnology, CNR , Via Amendola 122/D, 70126 Bari, Italy
| | - F Pirani
- Nanotec-Institute for Nanotechnology, CNR , Via Amendola 122/D, 70126 Bari, Italy.,Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia , 06123 Perugia, Italy
| | - A Laganà
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia , 06123 Perugia, Italy
| | - C Martí
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia , 06123 Perugia, Italy
| | - E Garcia
- Departamento de Quimica Fisica, Universidad del Pais Vasco (UPV/EHU) , 01006 Vitoria, Spain
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33
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Kleshchina NN, Korchagina KA, Bezrukov DS, Buchachenko AA. Modeling of Manganese Atom and Dimer Isolated in Solid Rare Gases: Structure, Stability, and Effect on Spin Coupling. J Phys Chem A 2017; 121:2429-2441. [PMID: 28263615 DOI: 10.1021/acs.jpca.6b12444] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Structures and energies of the trapping sites of manganese atom and dimer in solid Ar, Kr, and Xe are investigated within the classical model, which balances local distortion and long-range crystal order of the host and provides a means to estimate the relative site stabilities. The model is implemented with the additive pairwise potential field based on the ab initio and best empirical interatomic potential functions. In agreement with experiment, Mn single substitution (SS) and tetrahedral vacancy (TV) occupation are identified as stable for Ar and Kr, whereas the SS site is only found for Xe. Stable trapping sites of the weakly bound Mn2 dimer are shown to be the mergers of SS and/or TV atomic sites. For Ar, (SS + SS) and (TV + TV) sites are close in energy, whereas (SS + TV) site lies higher. The (SS + SS) accommodation is identified as the only stable site in Kr and Xe at low energies. The results are compared with the resonance Raman, electron spin resonance, and absorption spectroscopy data. Reproducing the numbers of stable sites, the calculations tend to underestimate the matrix effect on the dimer vibrational frequency and spin-spin coupling constant. Nonetheless, the level of agreement is found to be informative for tentative assignments of the complex features seen in Mn2 matrix isolation spectroscopy.
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Affiliation(s)
- Nadezhda N Kleshchina
- Department of Chemistry, M. V. Lomonosov Moscow State University , Moscow 119991, Russia
| | - Kseniia A Korchagina
- Department of Chemistry, M. V. Lomonosov Moscow State University , Moscow 119991, Russia
| | - Dmitry S Bezrukov
- Department of Chemistry, M. V. Lomonosov Moscow State University , Moscow 119991, Russia.,Skolkovo Institute of Science and Technology , Skolkovo Innovation Center, Building 3, Moscow 143026, Russia
| | - Alexei A Buchachenko
- Skolkovo Institute of Science and Technology , Skolkovo Innovation Center, Building 3, Moscow 143026, Russia
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34
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Albertí M, Amat A, Aguilar A, Pirani F. Methanol–methanol and methanol–water systems: the intermolecular interactions controlling the transition from small clusters to the liquid phase. Phys Chem Chem Phys 2017. [DOI: 10.1039/c7cp02919e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The present paper focuses on the characterization of the properties of methanol and water molecules in gas and liquid enviroments.
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Affiliation(s)
- Margarita Albertí
- IQTCUB
- Departament de Ciència de Materials i Química Física
- Universitat de Barcelona
- 08028 Barcelona
- Spain
| | - Anna Amat
- Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO)
- CNR-ISTM
- 06123 Perugia
- Italy
| | - Antonio Aguilar
- IQTCUB
- Departament de Ciència de Materials i Química Física
- Universitat de Barcelona
- 08028 Barcelona
- Spain
| | - Fernando Pirani
- Dipartimento di Chimica
- Biologia e Biotecnologie
- Università di Perugia
- 06123 Perugia and Istituto di Nanotecnologia (CNR, NANOTEC)
- 70126 Bari
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35
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Cappelletti D, Falcinelli S, Pirani F. The intermolecular interaction in D2 − CX4 and O2 − CX4 (X = F, Cl) systems: Molecular beam scattering experiments as a sensitive probe of the selectivity of charge transfer component. J Chem Phys 2016; 145:134305. [DOI: 10.1063/1.4964092] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- David Cappelletti
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, Via Elce di Sotto 8, Perugia 06123, Italy
| | - Stefano Falcinelli
- Dipartimento di Ingegneria Civile ed Ambientale, Università di Perugia, Via G. Duranti 93, Perugia 06125, Italy
| | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, Via Elce di Sotto 8, Perugia 06123, Italy
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36
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Garcia E, Laganà A, Pirani F, Bartolomei M, Cacciatore M, Kurnosov A. Enhanced Flexibility of the O2 + N2 Interaction and Its Effect on Collisional Vibrational Energy Exchange. J Phys Chem A 2016; 120:5208-19. [PMID: 26982814 DOI: 10.1021/acs.jpca.6b00962] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Prompted by a comparison of measured and computed rate coefficients of Vibration-to-Vibration and Vibration-to-Translation energy transfer in O2 + N2 non-reactive collisions, extended semiclassical calculations of the related cross sections were performed to rationalize the role played by attractive and repulsive components of the interaction on two different potential energy surfaces. By exploiting the distributed concurrent scheme of the Grid Empowered Molecular Simulator we extended the computational work to quasiclassical techniques, investigated in this way more in detail the underlying microscopic mechanisms, singled out the interaction components facilitating the energy transfer, improved the formulation of the potential, and performed additional calculations that confirmed the effectiveness of the improvement introduced.
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Affiliation(s)
- E Garcia
- Departamento de Quimica Fisica, Universidad del Pais Vasco (UPV/EHU) , 01006 Vitoria, Spain
| | - A Laganà
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia , 06100 Perugia, Italy
| | - F Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia , 06100 Perugia, Italy
| | - M Bartolomei
- Instituto de Física Fundamental, CSIC , Serrano 123, 28006 Madrid, Spain
| | - M Cacciatore
- Nanotec-Institute for Nanotechnology, CNR , c/o University campus, Chemistry Department, Via Orabona 4, 70123 Bari, Italy
| | - A Kurnosov
- Troitsk Institute of Innovation and Fusion Research , 142092 Troitsk, Moscow, Russia
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37
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A force field for acetone: the transition from small clusters to liquid phase investigated by molecular dynamics simulations. Theor Chem Acc 2016. [DOI: 10.1007/s00214-016-1914-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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38
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Grimme S, Hansen A, Brandenburg JG, Bannwarth C. Dispersion-Corrected Mean-Field Electronic Structure Methods. Chem Rev 2016; 116:5105-54. [DOI: 10.1021/acs.chemrev.5b00533] [Citation(s) in RCA: 799] [Impact Index Per Article: 99.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Stefan Grimme
- Mulliken Center for Theoretical
Chemistry, Universität Bonn, 53113 Bonn, Germany
| | - Andreas Hansen
- Mulliken Center for Theoretical
Chemistry, Universität Bonn, 53113 Bonn, Germany
| | | | - Christoph Bannwarth
- Mulliken Center for Theoretical
Chemistry, Universität Bonn, 53113 Bonn, Germany
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39
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Cappelletti D, Aquilanti V, Bartocci A, Nunzi F, Tarantelli F, Belpassi L, Pirani F. Interaction of O2 with CH4, CF4, and CCl4 by Molecular Beam Scattering Experiments and Theoretical Calculations. J Phys Chem A 2016; 120:5197-207. [PMID: 26938313 DOI: 10.1021/acs.jpca.6b00948] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Gas phase collisions of O2 by CH4, CF4, and CCl4 have been investigated with the molecular beam technique by measuring both the integral cross section value, Q, and its dependence on the collision velocity, v. The adopted experimental conditions have been appropriate to resolve the oscillating "glory" pattern, a quantum interference effect controlled by the features of the intermolecular interaction, for all the three case studies. The analysis of the Q(v) data, performed by adopting a suitable representation of the intermolecular potential function, provided the basic features of the anisotropic potential energy surfaces at intermediate and large separation distances and information on the relative role of the physically relevant types of contributions to the global interaction. The present work demonstrates that while O2-CH4 and O2-CF4 are basically bound through the balance between size (Pauli) repulsion and dispersion attraction, an appreaciable intermolecular bond stabilization by charge transfer is operative in O2-CCl4. Ab initio calculations of the strength of the interaction, coupled with detailed analysis of electronic charge displacement promoted by the formation of the dimer, fully rationalizes the experimental findings. This investigation indicates that the interactions of O2, when averaged over its relative orientations, are similar to that of a noble gas (Ng), specifically Ar. We also show that the binding energy in the basic configurations of the prototypical Ng-CF4,CCl4 systems [ Cappelletti , D. ; Chem. Eur. J. 2015 , 21 , 6234 - 6240 ] can be reconstructed by using the interactions in Ng-F and Ng-Cl systems, previously characterized by molecular beam scattering experiments of state-selected halogen atom beams. This information is fundamental to approach the modeling of the weak intermolecular halogen bond. On the basis of the electronic polarizability, this also confirms [ Aquilanti , V. ; Angew. Chem., Int. Ed. 2005 , 44 , 2356 - 2360 ] that O2 can be taken as a proper reference partner for simulating the behavior of some basic noncovalent components of the interactions involving water. Present results are of fundamental relevance to build up the force field controlling the hydrophobic behavior of prototypical apolar CX4 (X = H, F, Cl) molecules.
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Affiliation(s)
- David Cappelletti
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia , Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Vincenzo Aquilanti
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia , Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Alessio Bartocci
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia , Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Francesca Nunzi
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia , Via Elce di Sotto 8, 06123 Perugia, Italy.,CNR-Istituto di Scienze e Tecnologie Molecolari, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Francesco Tarantelli
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia , Via Elce di Sotto 8, 06123 Perugia, Italy.,CNR-Istituto di Scienze e Tecnologie Molecolari, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Leonardo Belpassi
- CNR-Istituto di Scienze e Tecnologie Molecolari, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia , Via Elce di Sotto 8, 06123 Perugia, Italy
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40
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Albertí M, Amat A, Aguilar A, Pirani F. Molecular Dynamics Simulations of Small Clusters and Liquid Hydrogen Sulfide at Different Thermodynamic Conditions. J Phys Chem A 2016; 120:4749-57. [DOI: 10.1021/acs.jpca.5b11843] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- M. Albertí
- IQTCUB,
Departament de Química Física, Universitat de Barcelona, 08028 Barcelona, Spain
| | - A. Amat
- Computational
Laboratory for Hybrid/Organic Photovoltaics (CLHYO), CNR-ISTM, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - A. Aguilar
- IQTCUB,
Departament de Química Física, Universitat de Barcelona, 08028 Barcelona, Spain
| | - F. Pirani
- Dipartimento
di Chimica, Biologia e Biotecnologie, Università di Perugia, 06123 Perugia, Italy
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41
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Albertí M, Amat A, Farrera L, Pirani F. From the (NH3)2–5 clusters to liquid ammonia: Molecular dynamics simulations using the NVE and NpT ensembles. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.09.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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42
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Roncaratti LF, Leal LA, Pirani F, Aquilanti V, e Silva GM, Gargano R. Chirality of weakly bound complexes: the potential energy surfaces for the hydrogen-peroxide-noble-gas interactions. J Chem Phys 2015; 141:134309. [PMID: 25296808 DOI: 10.1063/1.4897136] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We consider the analytical representation of the potential energy surfaces of relevance for the intermolecular dynamics of weakly bound complexes of chiral molecules. In this paper we study the H2O2-Ng (Ng=He, Ne, Ar, Kr, and Xe) systems providing the radial and the angular dependence of the potential energy surface on the relative position of the Ng atom. We accomplish this by introducing an analytical representation which is able to fit the ab initio energies of these complexes in a wide range of geometries. Our analysis sheds light on the role that the enantiomeric forms and the symmetry of the H2O2 molecule play on the resulting barriers and equilibrium geometries. The proposed theoretical framework is useful to study the dynamics of the H2O2 molecule, or other systems involving O-O and S-S bonds, interacting by non-covalent forces with atoms or molecules and to understand how the relative orientation of the O-H bonds changes along collisional events that may lead to a hydrogen bond formation or even to selectivity in chemical reactions.
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Affiliation(s)
- L F Roncaratti
- Instituto de Física, Universidade de Brasília, 70910 Brasília, Brazil
| | - L A Leal
- Instituto de Física, Universidade de Brasília, 70910 Brasília, Brazil
| | - F Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, 06123 Perugia, Italy
| | - V Aquilanti
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, 06123 Perugia, Italy
| | - G M e Silva
- Instituto de Física, Universidade de Brasília, 70910 Brasília, Brazil
| | - R Gargano
- Instituto de Física, Universidade de Brasília, 70910 Brasília, Brazil
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43
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Bartocci A, Belpassi L, Cappelletti D, Falcinelli S, Grandinetti F, Tarantelli F, Pirani F. Catching the role of anisotropic electronic distribution and charge transfer in halogen bonded complexes of noble gases. J Chem Phys 2015; 142:184304. [DOI: 10.1063/1.4919692] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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44
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Albertí M, Amat A, Aguilar A, Huarte-Larrañaga F, Lucas JM, Pirani F. A molecular dynamics study of the evolution from the formation of the $${\text {C}}_{6}{\text {F}}_{6}$$ C 6 F 6 –( $${\text {H}}_{2}{\text {O}})_{n}$$ H 2 O ) n small aggregates to the $${\text {C}}_{6}{\text {F}}_{6}$$ C 6 F 6 solvation. Theor Chem Acc 2015. [DOI: 10.1007/s00214-015-1662-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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45
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Cappelletti D, Bartocci A, Grandinetti F, Falcinelli S, Belpassi L, Tarantelli F, Pirani F. Experimental Evidence of Chemical Components in the Bonding of Helium and Neon with Neutral Molecules. Chemistry 2015; 21:6234-40. [DOI: 10.1002/chem.201406103] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2014] [Indexed: 11/11/2022]
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46
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Van de Vijver R, Vandewiele NM, Bhoorasingh PL, Slakman BL, Seyedzadeh Khanshan F, Carstensen HH, Reyniers MF, Marin GB, West RH, Van Geem KM. Automatic Mechanism and Kinetic Model Generation for Gas- and Solution-Phase Processes: A Perspective on Best Practices, Recent Advances, and Future Challenges. INT J CHEM KINET 2015. [DOI: 10.1002/kin.20902] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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47
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Cappelletti D, Bartocci A, Frati F, Roncaratti LF, Belpassi L, Tarantelli F, Lakshmi PA, Arunan E, Pirani F. H2O–CH4and H2S–CH4complexes: a direct comparison through molecular beam experiments and ab initio calculations. Phys Chem Chem Phys 2015; 17:30613-23. [DOI: 10.1039/c5cp03704b] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Electron density redistribution upon the formation of the water–methane complex arises from polarisation and charge transfer effects.
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Affiliation(s)
- David Cappelletti
- Dipartimento di Chimica
- Biologia e Biotecnologie
- Università di Perugia
- Italy
| | - Alessio Bartocci
- Dipartimento di Chimica
- Biologia e Biotecnologie
- Università di Perugia
- Italy
| | - Federica Frati
- Dipartimento di Chimica
- Biologia e Biotecnologie
- Università di Perugia
- Italy
| | - Luiz F. Roncaratti
- Dipartimento di Chimica
- Biologia e Biotecnologie
- Università di Perugia
- Italy
| | | | | | | | - Elangannan Arunan
- Indian Institute of Science
- Dept. Inorgan. & Phys. Chem
- Bangalore 560012
- India
| | - Fernando Pirani
- Dipartimento di Chimica
- Biologia e Biotecnologie
- Università di Perugia
- Italy
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48
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Brunetti BG, Candori P, Falcinelli S, Pirani F, Vecchiocattivi F. The stereodynamics of the Penning ionization of water by metastable neon atoms. J Chem Phys 2014; 139:164305. [PMID: 24182027 DOI: 10.1063/1.4826101] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
The stereodynamics of the Penning ionization of water molecules by collision with metastable neon atoms, occurring in the thermal energy range, is of great relevance for the understanding of fundamental aspects of the physical chemistry of water. This process has been studied by analyzing the energy spectrum of the emitted electrons previously obtained in our laboratory in a crossed beam experiment [B. G. Brunetti, P. Candori, D. Cappelletti, S. Falcinelli, F. Pirani, D. Stranges, and F. Vecchiocattivi, Chem. Phys. Lett. 539-540, 19 (2012)]. For the spectrum analysis, a novel semiclassical method is proposed, that assumes ionization events as mostly occurring in the vicinities of the collision turning points. The potential energy driving the system in the relevant configurations of the entrance and exit channels, used in the spectrum simulation, has been formulated by the use of a semiempirical method. The analysis puts clearly in evidence how different approaches of the metastable atom to the water molecule lead to ions in different electronic states. In particular, it provides the angular acceptance cones where the selectivity of the process leading to the specific formation of each one of the two energetically possible ionic product states of H2O(+) emerges. It is shown how the ground state ion is formed when neon metastable atoms approach water mainly perpendicularly to the molecular plane, while the first excited electronic state is formed when the approach occurs preferentially along the C2v axis, on the oxygen side. An explanation is proposed for the observed vibrational excitation of the product ions.
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49
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Bartocci A, Cappelletti D, Pirani F, Tarantelli F, Belpassi L. Intermolecular Interaction in the H2S–H2 Complex: Molecular Beam Scattering Experiments and Ab-Inito Calculations. J Phys Chem A 2014; 118:6440-50. [DOI: 10.1021/jp502170g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alessio Bartocci
- Dipartimento
di Chimica, Biologia e Biotecnologie, Università di Perugia, 06123, Italy
| | - David Cappelletti
- Dipartimento
di Chimica, Biologia e Biotecnologie, Università di Perugia, 06123, Italy
| | - Fernando Pirani
- Dipartimento
di Chimica, Biologia e Biotecnologie, Università di Perugia, 06123, Italy
| | - Francesco Tarantelli
- Dipartimento
di Chimica, Biologia e Biotecnologie, Università di Perugia, 06123, Italy
| | - Leonardo Belpassi
- Istituto di Scienze e Tecnologie Molecolari del CNR, Perugia, 06123, Italy
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50
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Roncaratti LF, Cappelletti D, Pirani F. The spontaneous synchronized dance of pairs of water molecules. J Chem Phys 2014; 140:124318. [PMID: 24697452 DOI: 10.1063/1.4869595] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Luiz F Roncaratti
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, 06123 Perugia, Italy
| | - David Cappelletti
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, 06123 Perugia, Italy
| | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, 06123 Perugia, Italy
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