1
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Smirnov AN, Solomonik VG. Composite ab initio vibrational spectroscopy and thermochemistry of low-valency lanthanide compounds: europium dihalides EuX 2 (X = F, Cl, Br, I). Phys Chem Chem Phys 2024; 26:24870-24880. [PMID: 39291639 DOI: 10.1039/d4cp02507e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/19/2024]
Abstract
A unique diversity in chemical properties of lanthanide compounds making them very useful in various important applications stems not least from the existence of less common Ln oxidation states, in particular +2. However, the molecular properties of low-valency lanthanide compounds are not yet well studied even for the most stable divalent Ln-containing species, such as europium dihalides. In this paper, highly accurate molecular structures, vibrational spectra, and atomisation energies of the europium dihalides EuX2 (X = F, Cl, Br, I) are obtained at the complete basis set CCSD(T) level. All of the EuX2 species are calculated to be non-linear (C2v) exhibiting a regular increase in X-Eu-X bond angle on passing through the halogen series (F → Cl → Br → I), from 117° in EuF2 to 141° in EuI2, which is accompanied by a rapid decrease in the barriers to linearity, h = E(D∞h) - E(C2v), from 2180 cm-1 to 166 cm-1, respectively. The Eu-X bonds in EuX2 appear to be longer but energetically stronger than those in the respective monohalides EuX, whose properties are studied in this work at the same level of theory as EuX2. The performance of the Ln 4f-in-core pseudopotential (PP) approximation for EuX2 is assessed by comparing the Eu PP-based coupled-cluster (CC) calculations with all-electron CC benchmarks. Incorporating the Eu 4f electrons into the PP is shown to cause large errors: up to 10 deg. in X-Eu-X bond angles, 80% in barriers to linearity, and 0.05 Å in the Eu-X bond lengths, which proves the necessity of an explicit treatment of 4f electrons if high accuracy is the goal. The present results set a benchmark in the field of low-valency lanthanide chemistry, in particular for the calibration of DFT functionals.
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Affiliation(s)
- Alexander N Smirnov
- Department of Physics, Ivanovo State University of Chemistry and Technology, Ivanovo 153000, Russia.
| | - Victor G Solomonik
- Department of Physics, Ivanovo State University of Chemistry and Technology, Ivanovo 153000, Russia.
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2
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Chakraborty R, de Moraes MMF, Boguslawski K, Nowak A, Świerczyński J, Tecmer P. Toward Reliable Dipole Moments without Single Excitations: The Role of Orbital Rotations and Dynamical Correlation. J Chem Theory Comput 2024; 20:4689-4702. [PMID: 38809012 PMCID: PMC11171297 DOI: 10.1021/acs.jctc.4c00471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2024] [Revised: 05/15/2024] [Accepted: 05/17/2024] [Indexed: 05/30/2024]
Abstract
The dipole moment is a crucial molecular property linked to a molecular system's bond polarity and overall electronic structure. To that end, the electronic dipole moment, which results from the electron density of a system, is often used to assess the accuracy and reliability of new electronic structure methods. This work analyses electronic dipole moments computed with the pair coupled cluster doubles (pCCD) ansätze and its linearized coupled cluster (pCCD-LCC) corrections using the canonical Hartree-Fock and pCCD-optimized (localized) orbital bases. The accuracy of pCCD-based dipole moments is assessed against experimental and CCSD(T) reference values using relaxed and unrelaxed density matrices and different basis set sizes. Our test set comprises molecules of various bonding patterns and electronic structures, exposing pCCD-based methods to a wide range of electron correlation effects. Additionally, we investigate the performance of pCCD-in-DFT dipole moments of some model complexes. Finally, our work indicates the importance of orbital relaxation in the pCCD model and shows the limitations of the linearized couple cluster corrections in predicting electronic dipole moments of multiple-bonded systems. Most importantly, pCCD with a linearized CCD correction can reproduce the dipole moment surfaces in singly bonded molecules, which are comparable to the multireference ones.
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Affiliation(s)
- Rahul Chakraborty
- Institute
of Physics, Faculty of Physics, Astronomy, and Informatics, Nicolaus Copernicus University in Toruń, Grudziadzka 5, 87-100 Toruń, Poland
| | - Matheus Morato F. de Moraes
- Institute
of Physics, Faculty of Physics, Astronomy, and Informatics, Nicolaus Copernicus University in Toruń, Grudziadzka 5, 87-100 Toruń, Poland
| | - Katharina Boguslawski
- Institute
of Physics, Faculty of Physics, Astronomy, and Informatics, Nicolaus Copernicus University in Toruń, Grudziadzka 5, 87-100 Toruń, Poland
| | - Artur Nowak
- Institute
of Physics, Faculty of Physics, Astronomy, and Informatics, Nicolaus Copernicus University in Toruń, Grudziadzka 5, 87-100 Toruń, Poland
| | - Julian Świerczyński
- Institute
of Engineering and Technology, Faculty of Physics, Astronomy, and
Informatics, Nicolaus Copernicus University
in Toruń, Grudzia̧dzka
5, 87-100 Toruń, Poland
| | - Paweł Tecmer
- Institute
of Physics, Faculty of Physics, Astronomy, and Informatics, Nicolaus Copernicus University in Toruń, Grudziadzka 5, 87-100 Toruń, Poland
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3
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Gałyńska M, Boguslawski K. Benchmarking Ionization Potentials from pCCD Tailored Coupled Cluster Models. J Chem Theory Comput 2024; 20:4182-4195. [PMID: 38752491 PMCID: PMC11137826 DOI: 10.1021/acs.jctc.4c00172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Revised: 05/04/2024] [Accepted: 05/07/2024] [Indexed: 05/29/2024]
Abstract
The ionization potential (IP) is an important parameter providing essential insights into the reactivity of chemical systems. IPs are also crucial for designing, optimizing, and understanding the functionality of modern technological devices. We recently showed that limiting the CC ansatz to the seniority-zero sector proves insufficient in predicting reliable and accurate ionization potentials within an IP equation-of-motion coupled-cluster formalism. Specifically, the absence of dynamical correlation in the seniority-zero pair coupled cluster doubles (pCCD) model led to unacceptably significant errors of approximately 1.5 eV. In this work, we aim to explore the impact of dynamical correlation and the choice of the molecular orbital basis (canonical vs localized) in CC-type methods targeting 230 ionized states in 70 molecules, comprising small organic molecules, medium-sized organic acceptors, and nucleobases. We focus on pCCD-based approaches as well as the conventional IP-EOM-CCD and IP-EOM-CCSD. Their performance is compared to the CCSD(T) or CCSDT equivalent and experimental reference data. Our statistical analysis reveals that all investigated frozen-pair coupled cluster methods exhibit similar performance, with differences in errors typically within chemical accuracy (1 kcal/mol or 0.05 eV). Notably, the effect of the molecular orbital basis, such as canonical Hartree-Fock or natural pCCD-optimized orbitals, on the IPs is marginal if dynamical correlation is accounted for. Our study suggests that triple excitations are crucial in achieving chemical accuracy in IPs when modeling electron detachment processes with pCCD-based methods.
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Affiliation(s)
- Marta Gałyńska
- Institute of Physics, Faculty of Physics,
Astronomy, and Informatics, Nicolaus Copernicus
University in Toruń, Grudziadzka 5, 87-100 Toruń, Poland
| | - Katharina Boguslawski
- Institute of Physics, Faculty of Physics,
Astronomy, and Informatics, Nicolaus Copernicus
University in Toruń, Grudziadzka 5, 87-100 Toruń, Poland
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4
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Hartwig B, Schnell M, Suhm MA, Obenchain DA. Weak hydrogen bonding to halogens and chirality communication in propanols: Raman and microwave spectroscopy benchmark theory. Phys Chem Chem Phys 2024; 26:9432-9452. [PMID: 38446207 DOI: 10.1039/d3cp04911f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2024]
Abstract
Constitutional and conformational isomers of bromopropanol are vibrationally and rotationally characterised with parallels drawn to the structural chlorine analogues. A previous microwave spectroscopic study of the chloropropanols is re-examined and all systems are explored by Raman jet spectroscopy. For bromine, the entire nuclear quadrupole coupling tensors are accurately determined and compared to their chlorine counterparts. Tensor asymmetry parameters are determined and linked with the hydrogen bond strength as indicated by the downshift of the OH-stretching frequency. The spectroscopic constants derived from the observed transitions are used as benchmarks for a large variety of electronic structure methods followed by harmonic and anharmonic rovibrational treatments. The CCSD(T) electronic structure calculations provide the best performance, in particular once anharmonic and relativistic corrections are applied or implied. Standard DFT approaches vary substantially with respect to their systematic error cancellation across the investigated species, and cost-effective compromises for the different observables are proposed.
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Affiliation(s)
- Beppo Hartwig
- Institut für Physikalische Chemie, Tammannstrasse 6, 37077 Göttingen, Germany.
| | - Melanie Schnell
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
- Institute of Physical Chemistry, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 1, 24118 Kiel, Germany
| | - Martin A Suhm
- Institut für Physikalische Chemie, Tammannstrasse 6, 37077 Göttingen, Germany.
| | - Daniel A Obenchain
- Institut für Physikalische Chemie, Tammannstrasse 6, 37077 Göttingen, Germany.
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5
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Smith TC, Tarroni R, Clouthier DJ. Spectroscopic detection of the gallium methylene (GaCH2 and GaCD2) free radical in the gas phase by laser-induced fluorescence and emission spectroscopy. J Chem Phys 2024; 160:024306. [PMID: 38197445 DOI: 10.1063/5.0182504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Accepted: 11/20/2023] [Indexed: 01/11/2024] Open
Abstract
GaCH2, a free radical thought to play a role in the chemical vapor deposition of gallium-containing thin films and semiconductors, has been spectroscopically detected for the first time. The radical was produced in a pulsed discharge jet using a precursor mixture of trimethylgallium vapor in high pressure argon and studied by laser-induced fluorescence and wavelength resolved emission techniques. Partially rotationally resolved spectra of the hydrogenated and deuterated species were obtained, and they exhibit the nuclear statistical weight variations and subband structure expected for a 2A2-2B1 electronic transition. The measured spectroscopic quantities have been compared to our own ab initio calculations of the ground and excited state properties. The electronic spectrum of gallium methylene is similar to the corresponding spectrum of the aluminum methylene radical, which we reported in 2022.
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Affiliation(s)
- Tony C Smith
- Ideal Vacuum Products, LLC, 5910 Midway Park Blvd. NE, Albuquerque, New Mexico 87109, USA
| | - Riccardo Tarroni
- Dipartimento di Chimica Industriale "Toso Montanari," Università di Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
| | - Dennis J Clouthier
- Ideal Vacuum Products, LLC, 5910 Midway Park Blvd. NE, Albuquerque, New Mexico 87109, USA
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6
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Montes de Oca-Estévez MJ, Prosmiti R. Quantum computations in heavy noble-gas hydride cations: Reference energies and new spectroscopic data. J Mol Graph Model 2023; 124:108562. [PMID: 37454411 DOI: 10.1016/j.jmgm.2023.108562] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 06/27/2023] [Accepted: 07/03/2023] [Indexed: 07/18/2023]
Abstract
Computational quantum chemistry has become a powerful tool with a wide range of possibilities to solve chemical-physical problems. As a result of this, the interest in the applications of computational quantum chemistry has expanded considerably, and has opened up novel research opportunities. In particular, those related to the characterization of heavy-atoms complexes, as most electronic structure calculations for such systems struggle with the problem posed by the large number of electrons present in them, and consequently, the introduction of relativistic effects. The present study performed an exhaustive assess to characterized the uncommon NgH+ (Ng = Kr, Xe, and Rn) hydride cations in order to provide accurate rovibrational data of their isotopes to assist in the laboratory characterization or even their astronomical detection. Scalar relativistic effects were included, and the ground and first electronically exited states potential curves were obtained from benchmark ab initio CCSD(T)/CBS and MRCI+Q electronic structure calculations. Next, such interaction potentials, correctly extended to long-range asymptotic regions, were employed in quantum bound state calculations and molecular spectroscopic constants were determined for the most abundance 84Kr, 132Xe, and 222Rn isotopes. Our results were discussed in comparison with available experimental and previous theoretical estimates, aiming to treat accuracy issues. The new sets provide reference data that could serve for spectroscopic characterization of such low abundance and high radioactive species.
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Affiliation(s)
- María Judit Montes de Oca-Estévez
- Institute of Fundamental Physics, CSIC (IFF-CSIC), Serrano 123, 28006 Madrid, Spain; Atelgraphics S.L., Mota de Cuervo 42, 28043, Madrid, Spain; Doctoral Programme in Theoretical Chemistry and Computational Modelling, Doctoral School, UAM, Madrid, Spain
| | - Rita Prosmiti
- Institute of Fundamental Physics, CSIC (IFF-CSIC), Serrano 123, 28006 Madrid, Spain.
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7
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Sharma D, Roy TK. Accuracy of Different Electronic Basis Set Families for Anharmonic Molecular Vibrations: A Comprehensive Benchmark Study. J Phys Chem A 2023; 127:7132-7147. [PMID: 37603414 DOI: 10.1021/acs.jpca.3c02874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2023]
Abstract
In this work, the accuracy and convergence of different electronic basis set families for the computation of anharmonic molecular vibrational spectroscopic calculations are benchmarked. A series of 39 different basis sets from different families following their hierarchy are assessed on VSCF and VSCF-PT2 algorithms with commonly used MP2 and DFT based B3LYP-D potentials for a set of molecular systems. Such an effort has been validated in a previous work ( J. Phys. Chem. A 2020, 124, 9203-9221) with split-valence basis sets for fundamentals and intensities. Here, fundamental transitions, vibrationally excited states, and intensities are compared with the experimental data to estimate the accuracy for a series of Jensen, Dunning, Calendar, Karlsruhe, and Sapporo basis set families. The convergence of basis sets are also compared with the large ANO basis set. Comprehensive statistical error analysis in terms of accuracy and precision was carried out to assess the performance of each basis set. It is observed that the improvement for the calculated harmonic and anharmonic values from the smaller basis sets to the medium (i.e., triple-ξ) is considerable. Beyond this, from medium to large basis sets, the convergence is slow and mostly posits nearly converged values. Basis sets with and without diffuse functions offer characteristically different accuracies and convergence patterns. Finally, recommendations are given on the choice of basis set chosen as black-box which can balance between accuracy and computational time, estimation of the errors, and their selections especially for large molecules.
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Affiliation(s)
- Dhiksha Sharma
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), Jammu, J&K 181143 India
| | - Tapta Kanchan Roy
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), Jammu, J&K 181143 India
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8
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Rusakov YY, Rusakova IL. New efficient pecS- n ( n = 1, 2) basis sets for quantum chemical calculations of 31P NMR chemical shifts. Phys Chem Chem Phys 2023. [PMID: 37409722 DOI: 10.1039/d3cp02664g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/07/2023]
Abstract
The basis sets that are used in the quantum chemical calculations of 31P NMR chemical shifts have always been one of the most important factors of accuracy. Regardless of what high-quality approach is employed, using basis sets of insufficient flexibility in the important angular regions may give poor results and lead to misassignments of the signals in the 31P NMR spectra. In this work, it was found that the existing nonrelativistic basis sets for phosphorus atom of double- and triple-ζ quality, specialized for the 31P NMR chemical shifts calculations, are essentially undersaturated in the d-angular space that occurred to play a significant role in the overall accuracy of these calculations. This problem has been thoroughly investigated, and new pecS-n (n = 1, 2) basis sets for phosphorus chemical shifts calculations were proposed. The exponents and contraction coefficients for the pecS-n basis sets were generated with the property-energy consistent method that has been introduced in our earlier paper, and has been proven useful in the creation of efficient property-oriented basis sets. New basis sets were optimized using the GIAO-DFT method with the B97-2 functional. Extensive benchmark calculations showed that the pecS-1 and pecS-2 basis sets provide very good accuracy, characterized by the corrected mean absolute percentage errors against the experiment of about 7.03 and 4.42 ppm, respectively. In particular, the accuracy of 31P NMR chemical shifts calculations achieved with the pecS-2 basis set is one of the most favorable accuracies for today. We believe that our new pecS-n (n = 1, 2) basis sets for phosphorus atom will prove useful in modern large-scale quantum chemical calculations of 31P NMR chemical shifts.
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Affiliation(s)
- Yuriy Yu Rusakov
- A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, Favorsky St. 1, 664033 Irkutsk, Russian Federation.
| | - Irina L Rusakova
- A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, Favorsky St. 1, 664033 Irkutsk, Russian Federation.
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9
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Möbs M, Graubner T, Eklund K, Karttunen AJ, Kraus F. Bromine Pentafluoride BrF 5 , the Formation of [BrF 6 ] - Salts, and the Stereochemical (In)activity of the Bromine Lone Pairs. Chemistry 2022; 28:e202202466. [PMID: 36106827 PMCID: PMC10092034 DOI: 10.1002/chem.202202466] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Indexed: 12/29/2022]
Abstract
BrF5 can be prepared by treating BrF3 with fluorine under UV light in the region of 300 to 400 nm at room temperature. It was analyzed by UV-Vis, NMR, IR and Raman spectroscopy. Its crystal structure was redetermined by X-ray diffraction, and its space group was corrected to Pnma. Quantum-chemical calculations were performed for the band assignment of the vibrational spectra. A monoclinic polymorph of BrF5 was quantum chemically predicted and then observed as its low-temperature modification in space group P21 /c by single crystal X-ray diffraction. BrF5 reacts with the alkali metal fluorides AF (A=K, Rb) to form alkali metal hexafluoridobromates(V), A[BrF6 ] the crystal structures of which have been determined. Both compounds crystallize in the K[AsF6 ] structure type (R3 ‾ ${\bar 3}$ , no. 148, hR24). For the species [BrF6 ]+ , BrF5 , [BrF6 ]- , and [IF6 ]- , the chemical bonds and lone pairs on the heavy atoms were investigated by means of intrinsic bond orbital analysis.
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Affiliation(s)
- Martin Möbs
- Anorganische Chemie, FluorchemiePhilipps-Universität MarburgHans-Meerwein-Str. 435032MarburgGermany
| | - Tim Graubner
- Anorganische Chemie, FluorchemiePhilipps-Universität MarburgHans-Meerwein-Str. 435032MarburgGermany
| | - Kim Eklund
- Department of Chemistry and Materials ScienceAalto University00076AaltoFinland
| | - Antti J. Karttunen
- Department of Chemistry and Materials ScienceAalto University00076AaltoFinland
| | - Florian Kraus
- Anorganische Chemie, FluorchemiePhilipps-Universität MarburgHans-Meerwein-Str. 435032MarburgGermany
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10
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Backhouse OJ, Booth GH. Constructing “Full-Frequency” Spectra via Moment Constraints for Coupled Cluster Green’s Functions. J Chem Theory Comput 2022; 18:6622-6636. [DOI: 10.1021/acs.jctc.2c00670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - George H. Booth
- Department of Physics, King’s College London, Strand, London WC2R 2LS, U.K
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11
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Fu Y, Niu Y, Liang X, Liu H, Zou W. High-Level Theoretical Study of the C 1Π States of GaCl, GaBr, InCl, and InBr. J Phys Chem A 2022; 126:5565-5573. [PMID: 35948043 DOI: 10.1021/acs.jpca.2c04240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
For the first singlet excited states C1Π of IIIA group monohalides GaCl, GaBr, InCl, and InBr, a very shallow potential well may exist in the flat potential energy curve, which poses a challenge to the theoretical accuracy. In this study, high-level theoretical calculations have been performed through the Feller-Peterson-Dixon composite approach to study the C1Π states, and the obtained spectroscopic constants agree well with the known experimental ones. It is found that the C1Π states are sensitive to the size of basis functions, spin-orbit coupling, and strong correlations mainly due to triple excitations. The final results show that the C1Π states of GaCl and InCl are quasi-bound with one (v' = 0) and four (v' = 0-3) vibrational levels, respectively, being consistent with the experimental findings, whereas the C1Π states of GaBr and InBr are repulsive. Our conclusions deny the existence of higher vibrational levels v' = 1 for GaCl, v' > 3 for InCl, and v' ≥ 0 for InBr in previous experimental and theoretical studies of C1Π.
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Affiliation(s)
- Yingxiang Fu
- Institute of Modern Physics, Northwest University, and Shaanxi Key Laboratory for Theoretical Physics Frontiers, Xi'an 710127, Shaanxi, P. R. China
| | - Yue Niu
- Institute of Modern Physics, Northwest University, and Shaanxi Key Laboratory for Theoretical Physics Frontiers, Xi'an 710127, Shaanxi, P. R. China
| | - Ximin Liang
- Institute of Modern Physics, Northwest University, and Shaanxi Key Laboratory for Theoretical Physics Frontiers, Xi'an 710127, Shaanxi, P. R. China
| | - Haitao Liu
- Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing, 100088, P. R. China
| | - Wenli Zou
- Institute of Modern Physics, Northwest University, and Shaanxi Key Laboratory for Theoretical Physics Frontiers, Xi'an 710127, Shaanxi, P. R. China
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12
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Zhang C, Cheng L. Atomic Mean-Field Approach within Exact Two-Component Theory Based on the Dirac-Coulomb-Breit Hamiltonian. J Phys Chem A 2022; 126:4537-4553. [PMID: 35763592 DOI: 10.1021/acs.jpca.2c02181] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An extension of the exact two-component theory with atomic mean-field integrals (the X2CAMF scheme) to the treatment of the Breit term together with efficient implementation using an atomic Dirac-Coulomb-Breit Hartree-Fock program is reported. The accuracy of the X2CAMF scheme for treating the contributions from the Breit term to the molecular properties is demonstrated using benchmark calculations of equilibrium bond lengths, harmonic frequencies, and dipole moments for molecules containing elements across the periodic table. Calculations of the properties for molecules containing period four elements aiming at high accuracy as well as for Th- and U-containing molecules are also presented and compared with experimental results to demonstrate the usefulness of the X2CAMF scheme in combination with accurate treatments of electron correlation by the coupled-cluster (CC) methods. The combination of CC methods and the X2CAMF scheme shows potential to extend the accuracy of CC calculations to heavy elements, e.g., to computational heavy-element thermochemistry.
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Affiliation(s)
- Chaoqun Zhang
- Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Lan Cheng
- Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, United States
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13
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Gole JL, Chalek CL, Mason MM, de Melo GF, Vasiliu M, Dixon DA. Observation of Selectively Populated Monohalide Excited States from the Reactions of Group 3 Metal (Sc, Y, and La) Monomers and Dimers with Halogen-Containing Molecules. J Phys Chem A 2022; 126:3403-3426. [PMID: 35613075 DOI: 10.1021/acs.jpca.2c01779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The chemiluminescent reactions of the group 3 metals Sc and Y with F2, Cl2, Br2, ClF, ICl (Sc), IBr (Y), and SF6 and La with F2, SF6, Cl2, and ClF have been studied at low pressures (6 × 10-6 to 4 × 10-4 Torr) using a beam-gas arrangement and extended to the 10-3 Torr multiple collision pressure range. Contrary to previous reports, the observed chemiluminescent spectra are primarily attributed to emission from the metal monohalides. Extensive pressure and temperature dependence studies and high-level correlated molecular orbital theory calculations of the bond dissociation energies support this conclusion and the attribution of the chemiluminescence. Evidence for the "selective" production of a monohalide excited electronic state is obtained for several of the Sc and Y reactions. All reactions producing the metal monofluorides are first order with respect to the oxidant, while reactions producing the monochlorides and monobromides are found to be "faster than first order" with respect to the oxidant. This difference is associated with the metal halide bond dissociation energies and the metal halide product internal density of states. Analysis of the temperature dependence for six representative reactions indicates that the "selective" excited-state formation of the metal monohalides proceeds via a direct mechanism with negligible activation energy. We compare and contrast the present results with previous experiments and interpretations which have assigned the selective emission from these systems to the group 3 dihalides produced in a two-step reaction sequence analogous to an electron jump process. The current results suggest a distinctly different interpretation of the observed processes in these systems. The observed selectivity observed in these studies is remarkable given the significant number of known and potential excited states in the scandium and yttrium halides as well as their different electronic configurations.
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Affiliation(s)
- James L Gole
- School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Carl L Chalek
- School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Marcos M Mason
- Department of Chemistry and Biochemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
| | - Gabriel F de Melo
- Department of Chemistry and Biochemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
| | - Monica Vasiliu
- Department of Chemistry and Biochemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
| | - David A Dixon
- Department of Chemistry and Biochemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
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14
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Chedid J, Jocelyn N, Eshuis H. Energies, structures, and harmonic frequencies of small water clusters from the direct random phase approximation. J Chem Phys 2021; 155:084303. [PMID: 34470345 DOI: 10.1063/5.0059343] [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] Open
Abstract
The binding energies, structures, and vibrational frequencies of water clusters up to 20 molecules are computed at the direct random phase approximation (RPA) level of theory and compared to theoretical benchmarks. Binding energies of the WATER27 set, which includes neutral and positively and negatively charged clusters, are predicted to be too low in the complete basis set limit by an average of 7 kcal/mol (9%) and are worse than the results from the best density functional theory methods or from the Møller-Plesset theory. The RPA shows significant basis set size dependence for binding energies. The order of the relative energies of the water hexamer and dodecamer isomers is predicted correctly by the RPA. The mean absolute deviation for angles and distances for neutral clusters up to the water hexamer are 0.2° and 0.6 pm, respectively, using quintuple-ζ basis sets. The relative energetic order of the hexamer isomers is preserved upon optimization. Vibrational frequencies for these systems are underestimated by several tens of wavenumbers for large basis sets, and deviations increase with the basis set size. Overall, the direct RPA method yields accurate structural parameters but systematically underestimates binding energies and shows strong basis set size dependence.
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Affiliation(s)
- Julianna Chedid
- Department of Chemistry and Biochemistry, Montclair State University, Montclair, New Jersey 07043, USA
| | - Nedjie Jocelyn
- Department of Chemistry and Biochemistry, Montclair State University, Montclair, New Jersey 07043, USA
| | - Henk Eshuis
- Department of Chemistry and Biochemistry, Montclair State University, Montclair, New Jersey 07043, USA
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15
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Vasiliu M, Peterson KA, Dixon DA. Bond Dissociation Energies in Heavy Element Chalcogen and Halogen Small Molecules. J Phys Chem A 2021; 125:1892-1902. [PMID: 33645983 DOI: 10.1021/acs.jpca.0c11393] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Thermodynamic properties including bond dissociation energies (BDEs), heats of formation, and gas-phase acidities for the hydrides and dimers of chalcogens and halogens, H2Y, HX, Y2, and X2 for Y = Se, Te, and At and X = Br, I, and At, have been predicted using the Feller-Peterson-Dixon composite-correlated molecular orbital theory approach. A full four-component CCSD(T) approach was used to calculate the spin-orbit effects on thermodynamic properties, except for Se2, where the AoC-DHF value was used due to strong multireference effects in Se2 for the SO calculations. The calculated results show that the At2 BDE is quite small, 19.5 kcal/mol, with much of the low bond energy due to spin-orbit effects. H2Po is not predicted to be stable to dehydrogenation to Po + H2 in terms of the free energy at 298 K. In the gas phase, HAt is predicted to be a stronger acid than H2SO4. The current results provide insights into potential difficulties in the actual experimental observation of such species for heavy elements.
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Affiliation(s)
- Monica Vasiliu
- Department of Chemistry and Biochemistry, University of Alabama, Tuscaloosa, Alabama 35401, United States
| | - Kirk A Peterson
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States
| | - David A Dixon
- Department of Chemistry and Biochemistry, University of Alabama, Tuscaloosa, Alabama 35401, United States
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16
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Liu Y, Liu Y, Liu Y, Zhang C, Li R, Yan B. Exploring the excited states of the GeH + radical cation including spin-orbit interaction: A revisited study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 247:119147. [PMID: 33189982 DOI: 10.1016/j.saa.2020.119147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2020] [Revised: 10/23/2020] [Accepted: 10/24/2020] [Indexed: 06/11/2023]
Abstract
In this paper, we have carried out high-level ab initio calculations on the electronic states of GeH+ with the configuration interaction method. The spin-orbit coupling (SOC), core-valence correlation (CV), scalar relativistic effects and Davidson correction (+Q) are included. The potential energy curves (PECs) of 13 Λ-S correlated with the four lowest dissociation limits and 32 Ω electronic states generated from those Λ-S states are obtained. Our results indicate that the first 3Σ- and second 3Π states are adiabatically correlated with the dissociation limit Ge(3Pg) + H+(1S), which is different from the previously reported Ge+(4Pg) + H(2Sg). From the computed PECs, the spectroscopic constants of the Λ-S and Ω states are determined, which are in good agreement with previous experiments. The dipole moments (DMs) for Λ-S electronic states are also investigated. With the help of spin-orbit coupling matrix involving the 13Σ- and 23Π states, the intricate couplings related with the crossing states are revealed, and the weak predissociation for ν' ≥0 vibrational levels of 13Σ- and the perturbations for vibrational levels of 21Σ+ (ν' ≥1) and 11Δ (ν' ≥0) states are analyzed. Finally, the transition properties of five transitions are predicted, including the Franck-Condon Factors (FCFs), transition dipole moments (TDMs), and the spontaneous radiative lifetimes of lower vibrational states. This study will improve our comprehension on the detailed electronic structure and spectroscopy of GeH+ radical cation.
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Affiliation(s)
- Yadong Liu
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
| | - Yong Liu
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
| | - Yahong Liu
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
| | - Cunhua Zhang
- Department of Physics, College of Science, Qiqihar University, Qiqihar 161006, China
| | - Rui Li
- Department of Physics, College of Science, Qiqihar University, Qiqihar 161006, China.
| | - Bing Yan
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.
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17
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Donchev AG, Taube AG, Decolvenaere E, Hargus C, McGibbon RT, Law KH, Gregersen BA, Li JL, Palmo K, Siva K, Bergdorf M, Klepeis JL, Shaw DE. Quantum chemical benchmark databases of gold-standard dimer interaction energies. Sci Data 2021; 8:55. [PMID: 33568655 PMCID: PMC7876112 DOI: 10.1038/s41597-021-00833-x] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 12/14/2020] [Indexed: 12/11/2022] Open
Abstract
Advances in computational chemistry create an ongoing need for larger and higher-quality datasets that characterize noncovalent molecular interactions. We present three benchmark collections of quantum mechanical data, covering approximately 3,700 distinct types of interacting molecule pairs. The first collection, which we refer to as DES370K, contains interaction energies for more than 370,000 dimer geometries. These were computed using the coupled-cluster method with single, double, and perturbative triple excitations [CCSD(T)], which is widely regarded as the gold-standard method in electronic structure theory. Our second benchmark collection, a core representative subset of DES370K called DES15K, is intended for more computationally demanding applications of the data. Finally, DES5M, our third collection, comprises interaction energies for nearly 5,000,000 dimer geometries; these were calculated using SNS-MP2, a machine learning approach that provides results with accuracy comparable to that of our coupled-cluster training data. These datasets may prove useful in the development of density functionals, empirically corrected wavefunction-based approaches, semi-empirical methods, force fields, and models trained using machine learning methods.
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Affiliation(s)
| | | | | | - Cory Hargus
- D. E. Shaw Research, New York, NY, 10036, USA
| | | | - Ka-Hei Law
- D. E. Shaw Research, New York, NY, 10036, USA
| | | | - Je-Luen Li
- D. E. Shaw Research, New York, NY, 10036, USA
| | - Kim Palmo
- D. E. Shaw Research, New York, NY, 10036, USA
| | | | | | | | - David E Shaw
- D. E. Shaw Research, New York, NY, 10036, USA. .,Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY, 10032, USA.
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18
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Xue J, Liu Y, Lian Y, Li R, Liu X, Xu H, Yan B. Spectroscopic properties and spin-orbit coupling of electronic excited states of the germanium dimer. Phys Chem Chem Phys 2021; 23:1103-1113. [PMID: 33346775 DOI: 10.1039/d0cp05712f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electronic structure and spectroscopic properties of the germanium dimer have been investigated by high-level ab initio calculations with consideration of spin-orbit coupling (SOC). The potential energy curves (PECs) of 19 Λ-S states, as well as those of 52 Ω states generated from the Λ-S states, are calculated by the multireference configuration interaction plus Davidson correction (MRCI + Q) method. The properties of the F3Σ+u1-X3Σ-g1 and H3Σ-u1-X3Σ-g1 transitions as well as the interactions of the F3Σ+u and H3Σ-u states with other excited states induced by SOC are investigated based on the calculated SO matrix and the PECs of the Ω states. Our results indicate that the previously observed spectra of Ge2 in the range 20 500-22 000 cm-1 should be assigned as the transition between the Ω = 1g component of the X3Σ-g state and Ω = 1u of the F3Σ+u state. Moreover, owing to the strong SOC with the repulsive 25Πu state, the H3Σ-u state is predissociative, leading to the Ge(3P2) + Ge(3P1) channel at vibrational levels higher than v' = 6. Our theoretical study would provide comprehensive information and shed light on understanding the spectroscopy and dynamics of the electronic excited states of Ge2.
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Affiliation(s)
- Jianlei Xue
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China. and Department of Medical Technology, Qiqihar Medical University, Qiqihar 161006, China
| | - Yong Liu
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.
| | - Yi Lian
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.
| | - Rui Li
- Department of Physics, College of Science, Qiqihar University, Qiqihar 161006, China
| | - Xueshen Liu
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.
| | - Haifeng Xu
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.
| | - Bing Yan
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.
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19
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Accurate MRCI study of the low-lying electronic states of the AlS molecule. COMPUT THEOR CHEM 2021. [DOI: 10.1016/j.comptc.2020.113097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Gao XF, An F, Li H, Xie JC, Wang XD, Meng X, Wu B, Xie DQ, Tian SX. Probing the Potential Energy Surfaces of BrCN - by Dissociative Electron Attachment. J Phys Chem Lett 2020; 11:9110-9116. [PMID: 33049137 DOI: 10.1021/acs.jpclett.0c02991] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
State coupling certainly determines the topologic features of the molecular potential energy surface (PES) and potentially diversifies chemical reaction pathways. Here we report the new PESs of BrCN- in the low-lying electronic states that are distinctly different from the previous predictions in the short Br-CN bond region but validated by the high-resolution ion velocity imaging measurements of low-energy dissociative electron attachment (DEA) to BrCN. Besides the vibrating CN- ions produced in the fast Br-CN bond stretching motions, we confirm that the ro-vibrating CN- ions with a nearly isotropic angular distribution are produced by receiving a torque in the combinational motion of Br-CN bond bending and stretching. The latter process is closely related to the potential well of BrCN- at the first excited state A2Π3/2 that arises from the Π-Σ state couplings. Our findings not only suggest that the PESs of other anionic cyanogen halides are in dire need of reexamination but also show that ion velocity imaging of the DEA process is a powerful experimental method for evaluating the theoretical PESs of molecular anions.
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Affiliation(s)
- Xiao-Fei Gao
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Feng An
- Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Institute of Theoretical and Computational Chemistry, Nanjing University, Nanjing 210023, China
| | - Hao Li
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Jing-Chen Xie
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Xu-Dong Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Xin Meng
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Bin Wu
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Dai-Qian Xie
- Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Institute of Theoretical and Computational Chemistry, Nanjing University, Nanjing 210023, China
- Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), University of Science and Technology of China, Hefei 230026, China
| | - Shan Xi Tian
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
- Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), University of Science and Technology of China, Hefei 230026, China
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21
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Mitra H, Roy TK. Comprehensive Benchmark Results for the Accuracy of Basis Sets for Anharmonic Molecular Vibrations. J Phys Chem A 2020; 124:9203-9221. [DOI: 10.1021/acs.jpca.0c06634] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hrishit Mitra
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), Jammu, Jammu and Kashmir 181143, India
| | - Tapta Kanchan Roy
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), Jammu, Jammu and Kashmir 181143, India
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22
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Nikitin AV, Rey M, Chizhmakova IS, Tyuterev VG. First Full-Dimensional Potential Energy and Dipole Moment Surfaces of SF6. J Phys Chem A 2020; 124:7014-7023. [DOI: 10.1021/acs.jpca.0c02733] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andrei V. Nikitin
- V.E. Zuev Institute of Atmospheric Optics, Russian Academy of Sciences, 1, Akademichesky Avenue, 634055 Tomsk, Russian Federation
| | - Michael Rey
- Groupe de Spectrométrie Moléculaire et Atmosphérique, UMR CNRS 6089, Université de Reims, U.F.R. Sciences, B.P. 1039, 51687 Reims Cedex 2, France
| | - Iana S. Chizhmakova
- Institute of Monitoring of Climatic and Ecological Systems, Russian Academy of Sciences, 10/3, Academichesky Avenue, 634055 Tomsk, Russian Federation
- QUAMER Laboratory, Tomsk State University, 36 Lenin Avenue, 634050 Tomsk, Russian Federation
| | - Vladimir G. Tyuterev
- Groupe de Spectrométrie Moléculaire et Atmosphérique, UMR CNRS 6089, Université de Reims, U.F.R. Sciences, B.P. 1039, 51687 Reims Cedex 2, France
- QUAMER Laboratory, Tomsk State University, 36 Lenin Avenue, 634050 Tomsk, Russian Federation
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23
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Pawłowski F, Ortiz JV. Relativistic electron detachment energies and spin–orbit splittings from quasiparticle electron propagator calculations. Mol Phys 2020. [DOI: 10.1080/00268976.2019.1700314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Filip Pawłowski
- Department of Chemistry and Biochemistry, Auburn University, Auburn, AL, USA
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24
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Dalla Tiezza M, Bickelhaupt FM, Flohé L, Maiorino M, Ursini F, Orian L. A dual attack on the peroxide bond. The common principle of peroxidatic cysteine or selenocysteine residues. Redox Biol 2020; 34:101540. [PMID: 32428845 PMCID: PMC7231847 DOI: 10.1016/j.redox.2020.101540] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 04/01/2020] [Accepted: 04/08/2020] [Indexed: 01/07/2023] Open
Abstract
The (seleno)cysteine residues in some protein families react with hydroperoxides with rate constants far beyond those of fully dissociated low molecular weight thiol or selenol compounds. In case of the glutathione peroxidases, we could demonstrate that high rate constants are achieved by a proton transfer from the chalcogenol to a residue of the active site [Orian et al. Free Radic. Biol. Med. 87 (2015)]. We extended this study to three more protein families (OxyR, GAPDH and Prx). According to DFT calculations, a proton transfer from the active site chalcogenol to a residue within the active site is a prerequisite for both, creating a chalcogenolate that attacks one oxygen of the hydroperoxide substrate and combining the delocalized proton with the remaining OH or OR, respectively, to create an ideal leaving group. The “parking postions” of the delocalized proton differ between the protein families. It is the ring nitrogen of tryptophan in GPx, a histidine in GAPDH and OxyR and a threonine in Prx. The basic principle, however, is common to all four families of proteins. We, thus, conclude that the principle outlined in this investigation offers a convincing explanation for how a cysteine residue can become peroxidatic. In some protein families, (seleno)cysteine residues react with hydroperoxides with very high rate constants. In GPx, DFT models of the oxidation of the catalytic site support a two-step mechanism for the H2O2 reduction. This mechanism is here found to operate in other thiol-based enzymes, i.e. OxyR, GAPDH and Prx.
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Affiliation(s)
- M Dalla Tiezza
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via Marzolo 1, 35131, Padova, Italy
| | - F M Bickelhaupt
- Department of Theoretical Chemistry and Amsterdam Center for Multiscale Modeling (ACMM), Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081 HV, Amsterdam, the Netherlands; Institute for Molecules and Materials (IMM), Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, the Netherlands
| | - L Flohé
- Dipartimento di Medicina Molecolare, Università degli Studi di Padova, V.le G. Colombo 3, 35121, Padova, Italy; Departamento de Bioquímica, Universidad de la República, Avda. General Flores 2125, 11800, Montevideo, Uruguay
| | - M Maiorino
- Dipartimento di Medicina Molecolare, Università degli Studi di Padova, V.le G. Colombo 3, 35121, Padova, Italy
| | - F Ursini
- Dipartimento di Medicina Molecolare, Università degli Studi di Padova, V.le G. Colombo 3, 35121, Padova, Italy
| | - L Orian
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via Marzolo 1, 35131, Padova, Italy.
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25
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Liu L, Yang CL, Wang MS, Ma XG, Sun ZP. The spectroscopic properties of the low-lying excited states and laser cooling scheme of SrBr molecule. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 228:117721. [PMID: 31718980 DOI: 10.1016/j.saa.2019.117721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 10/27/2019] [Accepted: 10/27/2019] [Indexed: 06/10/2023]
Abstract
The potential energy curves and the transition dipole moments for seven electronic states of SrBr molecule are obtained via the multi-reference configuration interaction method and the all-electron basis sets. The Davidson and relativistic corrections are also included. Based on the obtained potential energy curves, the rotational and vibrational energy levels of each electronic state are determined by solving the nuclear motion equation of the molecule. The spectroscopic parameters are fitted from the obtained energy levels by using Dunham expression. Moreover, the spin-orbit coupling splits of the A2Π state are considered to construct the optical laser cooling scheme. The Frank-Condon factors, radiation lifetimes, radiation widths between the ground electronic state and 2Π1/2, 3/2/B2Σ+ states are calculated. Then, the feasibility of laser cooling is explored and the optical scheme is proposed. The results demonstrate that the SrBr molecule is a promising candidate for laser cooling.
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Affiliation(s)
- Li Liu
- School of Physics and Optoelectronics Engineering, Ludong University, Yantai, 264025, People's Republic of China
| | - Chuan-Lu Yang
- School of Physics and Optoelectronics Engineering, Ludong University, Yantai, 264025, People's Republic of China.
| | - Mei-Shan Wang
- School of Physics and Optoelectronics Engineering, Ludong University, Yantai, 264025, People's Republic of China
| | - Xiao-Guang Ma
- School of Physics and Optoelectronics Engineering, Ludong University, Yantai, 264025, People's Republic of China
| | - Zhao-Peng Sun
- School of Physics and Optoelectronics Engineering, Ludong University, Yantai, 264025, People's Republic of China
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26
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27
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Abbott BZ, Hoobler PR, Schaefer HF. Relatives of cyanomethylene: replacement of the divalent carbon by B -, N +, Al -, Si, P +, Ga -, Ge, and As . Phys Chem Chem Phys 2019; 21:26438-26452. [PMID: 31774089 DOI: 10.1039/c9cp05777c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The lowest lying singlet and triplet states of HBCN-, HCCN, HNCN+, HAlCN-, HSiCN, HPCN+, HGaCN-, HGeCN, and HAsCN+ were studied using the CCSDT(Q)/CBS//CCSD(T)/aug-cc-pVQZ level of theory. Periodic trends in geometries, singlet-triplet gaps, and barriers to linearity were established and analyzed. The first row increasingly favors the triplet state, with a singlet-triplet gap (ΔEST = Esinglet - Etriplet) of 3.5 kcal mol-1, 11.9 kcal mol-1, and 22.6 kcal mol-1, respectively, for HBCN-, HCCN, and HNCN+. The second row increasing favors the singlet state, with singlet-triplet gaps of -20.4 kcal mol-1 (HAlCN-), -26.6 kcal mol-1 (HSiCN), and -26.8 kcal mol-1 (HPCN+). The third row also favors the singlet state, with singlet-triplet gaps of -26.8 kcal mol-1 (HGaCN-), -33.5 kcal mol-1 (HGeCN), and -33.1 kcal mol-1 (HAsCN+). The HXCN species have larger absolute singlet-triplet energy gaps compared to their parent species XH2 except for the case of X = N+. The effect of the substitution of hydrogen with a cyano group was analyzed with isodesmic bond separation analysis and NBO.
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Affiliation(s)
- Boyi Z Abbott
- Center for Computational Quantum Chemistry, University of Georgia, 140 Cedar Street, Athens, Georgia 30602, USA.
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28
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Wang G, Annaberdiyev A, Melton CA, Bennett MC, Shulenburger L, Mitas L. A new generation of effective core potentials from correlated calculations: 4s and 4p main group elements and first row additions. J Chem Phys 2019; 151:144110. [DOI: 10.1063/1.5121006] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Guangming Wang
- Department of Physics, North Carolina State University, Raleigh, North Carolina 27695-8202, USA
| | - Abdulgani Annaberdiyev
- Department of Physics, North Carolina State University, Raleigh, North Carolina 27695-8202, USA
| | - Cody A. Melton
- Department of Physics, North Carolina State University, Raleigh, North Carolina 27695-8202, USA
- Sandia National Laboratories, Albuquerque, New Mexico 87123, USA
| | - M. Chandler Bennett
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | | | - Lubos Mitas
- Department of Physics, North Carolina State University, Raleigh, North Carolina 27695-8202, USA
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29
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Lee KLK, Thorwirth S, Martin-Drumel MA, McCarthy MC. Generation and structural characterization of Ge carbides GeC n (n = 4, 5, 6) by laser ablation, broadband rotational spectroscopy, and quantum chemistry. Phys Chem Chem Phys 2019; 21:18911-18919. [PMID: 31451831 DOI: 10.1039/c9cp03607e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Following the recent discovery of T-shaped GeC2, rotational spectra of three larger Ge carbides, linear GeC4, GeC5, and GeC6 have been observed using chirped pulse and cavity Fourier transform microwave spectroscopy and a laser ablation molecule source, guided by new high-level quantum chemical calculations of their molecular structure. Like their isovalent Si-bearing counterparts, Ge carbides with an even number of carbon atoms beyond GeC2 are predicted to possess 1Σ ground electronic states, while odd-numbered carbon chains are generally 3Σ; all are predicted to be highly polar. For the three new molecules detected in this work, rotational lines of four of the five naturally occurring Ge isotopic variants have been observed between 6 and 22 GHz. Combining these measurements with ab initio force fields, the Ge-C bond lengths have been determined to high precision: the derived values of 1.776 Å for GeC4, 1.818 Å for GeC5, and 1.782 Å for GeC6 indicate a double bond between these two atoms. Somewhat surprisingly, the spectrum of GeC5 very closely resembles that of a 1Σ molecule, implying a spin-spin coupling constant λ in excess of 770 GHz for this radical, a likely consequence of the large spin-orbit constant of atomic Ge (∼1000 cm-1). A systematic comparison between the production of SiCn and GeCn chains by laser ablation has also been undertaken. The present work suggests that other large metal-bearing molecules may be amenable to detection by similar means.
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Affiliation(s)
- Kin Long Kelvin Lee
- Center for Astrophysics, Harvard-Smithsonian, 60 Garden Street, Cambridge, Massachusetts 02138, USA.
| | - Sven Thorwirth
- I. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany
| | - Marie-Aline Martin-Drumel
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - Michael C McCarthy
- Center for Astrophysics, Harvard-Smithsonian, 60 Garden Street, Cambridge, Massachusetts 02138, USA.
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30
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Finney BA, Peterson KA. Beyond chemical accuracy in the heavy p-block: The first ionization potentials and electron affinities of Ga-Kr, In-Xe, and Tl-Rn. J Chem Phys 2019; 151:024303. [PMID: 31301726 DOI: 10.1063/1.5110174] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
A relativistic coupled-cluster version of the Feller-Peterson-Dixon composite method has been used to accurately calculate the first ionization potentials (IPs) and electron affinities (EAs) of the post-d, p-block elements Ga-Rn. Complete basis set extrapolations including outer-core correlation at the CCSD(T) level of theory were combined with contributions from higher order electron correlation up to CCSDTQ, quantum electrodynamic effects (Lamb shift), and spin-orbit (SO) coupling including the Gaunt contribution. Several methods for including SO were investigated, in which all involved the four-component (4c) Dirac-Coulomb (DC) Hamiltonian. The treatment of SO coupling was the contribution that limited the final accuracy of the present results. In the cases where 4c-DC-CCSD(T) could be reliably used for the SO contributions, the final composite IPs and EAs agreed with the available experimental values to within an unsigned average error of just 0.16 and 0.20 kcal/mol, respectively. In all cases, the final IPs and EAs were within 1 kcal/mol of the available experimental values, except for the EAs of the group 13 elements (Ga, In, and Tl), where the currently accepted experimental values appear to be too large by as much as 4 kcal/mol. The values predicted in this work, which have estimated uncertainties of ±0.5 kcal/mol, are 5.25 (Ga), 7.69 (In), and 7.39 (Tl) kcal/mol. For the EAs of Po and At, which do not have experimental values, the current calculations predict values of 34.2 and 55.8 kcal/mol with estimated uncertainties of ±0.6 and ±0.3 kcal/mol, respectively.
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Affiliation(s)
- Brian A Finney
- Department of Chemistry, Washington State University, Pullman, Washington 99164-4630, USA
| | - Kirk A Peterson
- Department of Chemistry, Washington State University, Pullman, Washington 99164-4630, USA
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31
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Maity B, Minenkov Y, Cavallo L. Evaluation of experimental alkali metal ion–ligand noncovalent bond strengths with DLPNO-CCSD(T) method. J Chem Phys 2019; 151:014301. [DOI: 10.1063/1.5099580] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Affiliation(s)
- Bholanath Maity
- King Abdullah University of Science and Technology (KAUST), Physical Science and Engineering Division (PSE), KAUST Catalysis Center (KCC), 23955-6900 Thuwal, Saudi Arabia
| | - Yury Minenkov
- Moscow Institute of Physics and Technology, Institutskiy Pereulok 9, Dolgoprudny, Moscow Region 141700, Russian Federation
| | - Luigi Cavallo
- King Abdullah University of Science and Technology (KAUST), Physical Science and Engineering Division (PSE), KAUST Catalysis Center (KCC), 23955-6900 Thuwal, Saudi Arabia
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32
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Microhydration of caesium metaborate: structural and thermochemical properties of CsBO2 + n H2O (n = 1–4) aggregates. J Mol Model 2019; 25:207. [DOI: 10.1007/s00894-019-4094-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Accepted: 06/11/2019] [Indexed: 10/26/2022]
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33
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Koput J. Ab initio
structure and vibration‐rotation dynamics of germylene, GeH
2. J Comput Chem 2019; 40:1911-1918. [DOI: 10.1002/jcc.25848] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 03/25/2019] [Accepted: 04/16/2019] [Indexed: 11/09/2022]
Affiliation(s)
- Jacek Koput
- Department of ChemistryAdam Mickiewicz University 61–614, Poznań Poland
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34
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Koput J. Ab initio structure and vibration-rotation dynamics of the formyl and isoformyl cations, HCO +/HOC . J Chem Phys 2019; 150:154307. [PMID: 31005073 DOI: 10.1063/1.5089718] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Accurate structure and potential energy surface of the formyl and isoformyl cation system, HCO+/HOC+, in its ground electronic state X̃ 1Σ+ have been determined from ab initio calculations using the coupled-cluster approach in conjunction with the correlation-consistent basis sets up to septuple-zeta quality. Both the isomers are confirmed to be linear at equilibrium, with the total energy minimum of HOC+ lying 14 120 cm-1 above that of HCO+ and the HCO+ → HOC+ isomerization energy barrier being 26 870 cm-1 (in the Born-Oppenheimer approximation). The equilibrium structural parameters for HCO+ are estimated to be re(HC) = 1.0919 Å and re(CO) = 1.1058 Å, whereas those for HOC+ are estimated to be re(HO) = 0.9899 Å and re(CO) = 1.1544 Å. The vibration-rotation energy levels were predicted for various isotopologues using a variational approach and compared with the experimental data. For the spectroscopically well characterized formyl cation, the observed vibration-rotation energies and the effective rotational constants are reproduced to within about 2.3 cm-1 and 1.7 MHz, respectively. The role of the core-electron correlation, higher-order valence-electron correlation, scalar relativistic, and adiabatic effects in determining the structure and vibration-rotation dynamics of both the isomers is discussed.
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Affiliation(s)
- Jacek Koput
- Department of Chemistry, Adam Mickiewicz University, 61-614 Poznań, Poland
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35
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Titanocene Selenide Sulfides Revisited: Formation, Stabilities, and NMR Spectroscopic Properties. Molecules 2019; 24:molecules24020319. [PMID: 30654590 PMCID: PMC6358803 DOI: 10.3390/molecules24020319] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 01/10/2019] [Accepted: 01/11/2019] [Indexed: 11/27/2022] Open
Abstract
[TiCp2S5] (phase A), [TiCp2Se5] (phase F), and five solid solutions of mixed titanocene selenide sulfides [TiCp2SexS5−x] (Cp = C5H5−) with the initial Se:S ranging from 1:4 to 4:1 (phases B–E) were prepared by reduction of elemental sulfur or selenium or their mixtures by lithium triethylhydridoborate in thf followed by the treatment with titanocene dichloride [TiCp2Cl2]. Their 77Se and 13C NMR spectra were recorded from the CS2 solution. The definite assignment of the 77Se NMR spectra was based on the PBE0/def2-TZVPP calculations of the 77Se chemical shifts and is supported by 13C NMR spectra of the samples. The following complexes in varying ratios were identified in the CS2 solutions of the phases B–E: [TiCp2Se5] (51), [TiCp2Se4S] (41), [TiCp2Se3S2] (31), [TiCp2SSe3S] (36), [TiCp2SSe2S2] (25), [TiCp2SSeS3] (12), and [TiCp2S5] (01). The disorder scheme in the chalcogen atom positions of the phases B–E observed upon crystal structure determinations is consistent with the spectral assignment. The enthalpies of formation calculated for all twenty [TiCp2SexS5−x] (x = 0–5) at DLPNO-CCSD(T)/CBS level including corrections for core-valence correlation and scalar relativistic, as well as spin-orbit coupling contributions indicated that within a given chemical composition, the isomers of most favourable enthalpy of formation were those, which were observed by 77Se and 13C NMR spectroscopy.
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36
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Trogolo D, Arey JS, Tentscher PR. Gas-Phase Ozone Reactions with a Structurally Diverse Set of Molecules: Barrier Heights and Reaction Energies Evaluated by Coupled Cluster and Density Functional Theory Calculations. J Phys Chem A 2019; 123:517-536. [DOI: 10.1021/acs.jpca.8b10323] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daniela Trogolo
- School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - J. Samuel Arey
- School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, Überlandstrasse 133, 8600 Dübendorf, Switzerland
| | - Peter R. Tentscher
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, Überlandstrasse 133, 8600 Dübendorf, Switzerland
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37
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Wolf ME, Zhang B, Turney JM, Schaefer HF. A comparison between hydrogen and halogen bonding: the hypohalous acid–water dimers, HOX⋯H2O (X = F, Cl, Br). Phys Chem Chem Phys 2019; 21:6160-6170. [DOI: 10.1039/c9cp00422j] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Hypohalous acids (HOX) are a class of molecules that play a key role in the atmospheric seasonal depletion of ozone and have the ability to form both hydrogen and halogen bonds.
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Affiliation(s)
- Mark E. Wolf
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
| | - Boyi Zhang
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
| | - Justin M. Turney
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
| | - Henry F. Schaefer
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
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38
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Hou S, Qureshi AH, Wei Z. Atomic Charges in Highly Ionic Diatomic Molecules. ACS OMEGA 2018; 3:17180-17187. [PMID: 31458337 PMCID: PMC6643469 DOI: 10.1021/acsomega.8b02370] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Accepted: 11/27/2018] [Indexed: 06/10/2023]
Abstract
Atomic charges were investigated as functions of detectable atomic and molecular constants at equilibrium structures. It was found based upon the variation idea that atomic charges in highly ionic molecules can be expressed as a function of molecular dipole moments, polarizabilities of free cations, and polarizabilities of free neutral atoms of the corresponding anions. The function can be given in the form of classical Rittner's relationship (J. Chem. Phys. 1951, 19, 1030). For the ground states of alkali halide molecules, the predicted atomic charges are close to an elementary charge e and the predicted dipole moments are in good agreement with the observed values; for spin-restricted high-ionic systems such as the lowest 9Σ electronic states of BN, AlN, GaN, BP, AlP, GaP, BAs, AlAs, and GaAs molecules, the predicted atomic charges are also near 1e and in good agreement with the results of natural population analysis at MRCI/cc-pvqz and HF/6-311+G(3df) levels. Polarizabilities for the lowest quintet states of B-, Al-, Ga-, N+, P+, and As+ ions were also obtained based upon high-level ab initio computations. Atomic charges from other related methods are also investigated for comparison. The results demonstrate that high-quality atomic charges can be obtained with detectable variables, such as molecular dipole moment, vibrational frequency, as well as polarizabilities of the related free atoms and ions.
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Affiliation(s)
- Shilin Hou
- E-mail: .
Phone: 86-532-6678 6562 (S.H.)
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39
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40
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Khiri D, Černušák I, Louis F. Theoretical Study of the Reactions of H Atoms with CH 3I and CH 2I 2. J Phys Chem A 2018; 122:6546-6557. [PMID: 30016100 DOI: 10.1021/acs.jpca.8b04748] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
High level ab initio methods have been used to provide reliable kinetic data for the H + CH3I and H + CH2I2 gas-phase reactions. The (H, I)-abstraction and I-substitution reaction pathways were identified. The structures were determined on the potential energy surface at the MP2/aug-cc-pVTZ level of theory. The energetics was then refined using the coupled cluster theory. For the iodinated species, the spin-orbit coupling was calculated using the MRCI approach. The core valence and the scalar relativistic corrections were considered. Thermal rate constants were reported using the canonical transition-state theory (TST) and compared to computed values with the canonical variational transition-state theory (CVT) using the zero curvature tunneling (ZCT) and the small curvature tunneling (SCT) corrections over a wide temperature range (250-2500 K) to show the importance of quantum tunneling effects at low temperatures. They are given by the following expressions for the overall reactions using the CVT/SCT method: kH+CH3I( T) = 1.07 × 10-17 × T2.13 exp(2.68 (kJ mol-1)/ RT) and kH+CH2I2( T) = 5.73 × 10-21 × T2.97 exp(3.15 (kJ mol-1)/ RT). The I-abstraction is predicted to be the major pathway for both H + CH3I and H + CH2I2 reactions. The obtained kinetic parameters for the H + CH3I reaction are in excellent agreement with their experimental counterparts over the temperature range 300-750 K. On the basis of our calculated reaction enthalpies, a new evaluation of the standard enthalpy of formation at 298 K of CH2I and CHI2 has been provided. Obtained values are Δf H°298K (CH2I) = 219.5 kJ mol-1 and Δf H°298K(CHI2) = 296.3 kJ mol-1.
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Affiliation(s)
- Dorra Khiri
- Univ. Lille, CNRS, UMR 8522 -PC2A- PhysicoChimie des Processus de Combustion et de l'Atmosphère , 59000 Lille , France
| | - Ivan Černušák
- Department of Physical and Theoretical Chemistry, Faculty of Natural Sciences , Comenius University in Bratislava , Ilkovičova 6 , 84215 Bratislava , Slovakia
| | - Florent Louis
- Univ. Lille, CNRS, UMR 8522 -PC2A- PhysicoChimie des Processus de Combustion et de l'Atmosphère , 59000 Lille , France
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41
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Hellmann R, Jäger B, Bich E. State-of-the-art ab initio potential energy curve for the xenon atom pair and related spectroscopic and thermophysical properties. J Chem Phys 2018; 147:034304. [PMID: 28734299 DOI: 10.1063/1.4994267] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A new ab initio interatomic potential energy curve for two ground-state xenon atoms is presented. It is based on supermolecular calculations at the coupled-cluster level with single, double, and perturbative triple excitations [CCSD(T)] employing basis sets up to sextuple-zeta quality, which were developed as part of this work. In addition, corrections were determined for higher coupled-cluster levels up to CCSDTQ as well as for scalar and spin-orbit relativistic effects at the CCSD(T) level. A physically motivated analytical function was fitted to the calculated interaction energies and used to compute the vibrational spectrum of the dimer, the second virial coefficient, and the dilute gas transport properties. The agreement with the best available experimental data for the investigated properties is excellent; the new potential function is superior not only to previous ab initio potentials but also to the most popular empirical ones.
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Affiliation(s)
- Robert Hellmann
- Institut für Chemie, Universität Rostock, 18059 Rostock, Germany
| | - Benjamin Jäger
- Institut für Chemie, Universität Rostock, 18059 Rostock, Germany
| | - Eckard Bich
- Institut für Chemie, Universität Rostock, 18059 Rostock, Germany
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42
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Sylvetsky N, Martin JML. Probing the basis set limit for thermochemical contributions of inner-shell correlation: balance of core-core and core-valence contributions. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1478140] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- Nitai Sylvetsky
- Department of Organic Chemistry, Weizmann Institute of Science, Reḥovot, Israel
| | - Jan M. L. Martin
- Department of Organic Chemistry, Weizmann Institute of Science, Reḥovot, Israel
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43
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Koput J. Ab initio
potential energy surface and vibration-rotation energy levels of germanium dicarbide, GeC2. J Comput Chem 2018; 39:1327-1334. [DOI: 10.1002/jcc.25204] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 02/10/2018] [Accepted: 02/15/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Jacek Koput
- Department of Chemistry; Adam Mickiewicz University; Poznań 61-614 Poland
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44
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Fortin C, Khanniche S, Khiri D, Fèvre-Nollet V, Lebègue P, Cousin F, Černušák I, Louis F. Reactivity of Hydrogen Peroxide with Br and I Atoms. J Phys Chem A 2018; 122:1053-1063. [PMID: 29290117 DOI: 10.1021/acs.jpca.7b10318] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The reaction mechanisms of Br and I atoms with H2O2 have been investigated using DFT and high-level ab initio calculations. The H-abstraction and OH-abstraction channels were highlighted. The geometries of the stationary points were optimized at the B3LYP/aug-cc-pVTZ level of theory, and the energetics were recalculated with the coupled cluster theory. Spin-orbit coupling for each halogenated species was also explicitly computed by employing the MRCI level of theory. Thermochemistry for HOBr and HOI has been revised and updated standard enthalpies of formation at 298 K for HOBr and HOI are the following: ΔfH°298K(HOBr) = (-66.2 ± 4.6) kJ mol-1 and ΔfH°298K(HOI) = (-66.8 ± 4.7) kJ mol-1. The rate constants have been estimated using transition state theory (TST), canonical variational transition state theory (CVT), and CVT with small curvature tunneling (CVT/SCT) over a wide temperature range (250-2500 K). For the direct abstraction mechanism, the overall rate constant at 300 K was predicted to be 2.58 × 10-16 and 7.42 × 10-25 cm3 molecule-1s-1 for the Br + H2O2 and I + H2O2 reactions, respectively. The modified Arrhenius parameters have been estimated for the overall reactions: kBr+H2O2(T) = 4.80 × 10-26 T4.31 exp(-5.51 (kJ mol-1)/RT) and kI+H2O2(T) = 3.41 × 10-23 T3.29 exp(-56.32 (kJ mol-1)/RT).
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Affiliation(s)
- Camille Fortin
- Universite Lille, CNRS, UMR 8522 - PC2A - PhysicoChimie des Processus de Combustion et de l'Atmosphère , F-59000 Lille, France.,Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES , Cadarache, St Paul Lez Durance, 13115, France.,Laboratoire de Recherche Commun IRSN-CNRS-Lille1 "Cinétique Chimique, Combustion, Réactivité″ (C3R) , Cadarache, St Paul Lez Durance, 13115, France
| | - Sarah Khanniche
- Universite Lille, CNRS, UMR 8522 - PC2A - PhysicoChimie des Processus de Combustion et de l'Atmosphère , F-59000 Lille, France.,Laboratoire de Recherche Commun IRSN-CNRS-Lille1 "Cinétique Chimique, Combustion, Réactivité″ (C3R) , Cadarache, St Paul Lez Durance, 13115, France
| | - Dorra Khiri
- Universite Lille, CNRS, UMR 8522 - PC2A - PhysicoChimie des Processus de Combustion et de l'Atmosphère , F-59000 Lille, France.,Laboratoire de Recherche Commun IRSN-CNRS-Lille1 "Cinétique Chimique, Combustion, Réactivité″ (C3R) , Cadarache, St Paul Lez Durance, 13115, France
| | - Valérie Fèvre-Nollet
- Universite Lille, CNRS, UMR 8522 - PC2A - PhysicoChimie des Processus de Combustion et de l'Atmosphère , F-59000 Lille, France.,Laboratoire de Recherche Commun IRSN-CNRS-Lille1 "Cinétique Chimique, Combustion, Réactivité″ (C3R) , Cadarache, St Paul Lez Durance, 13115, France
| | - Patrick Lebègue
- Universite Lille, CNRS, UMR 8522 - PC2A - PhysicoChimie des Processus de Combustion et de l'Atmosphère , F-59000 Lille, France.,Laboratoire de Recherche Commun IRSN-CNRS-Lille1 "Cinétique Chimique, Combustion, Réactivité″ (C3R) , Cadarache, St Paul Lez Durance, 13115, France
| | - Frédéric Cousin
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES , Cadarache, St Paul Lez Durance, 13115, France.,Laboratoire de Recherche Commun IRSN-CNRS-Lille1 "Cinétique Chimique, Combustion, Réactivité″ (C3R) , Cadarache, St Paul Lez Durance, 13115, France
| | - Ivan Černušák
- Department of Physical and Theoretical Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava , Ilkovičova 6, 84215 Bratislava, Slovakia
| | - Florent Louis
- Universite Lille, CNRS, UMR 8522 - PC2A - PhysicoChimie des Processus de Combustion et de l'Atmosphère , F-59000 Lille, France.,Laboratoire de Recherche Commun IRSN-CNRS-Lille1 "Cinétique Chimique, Combustion, Réactivité″ (C3R) , Cadarache, St Paul Lez Durance, 13115, France
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45
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Song B, Waldrop JM, Wang X, Patkowski K. Accurate virial coefficients of gaseous krypton from state-of-the-art ab initio potential and polarizability of the krypton dimer. J Chem Phys 2018; 148:024306. [PMID: 29331117 DOI: 10.1063/1.5006970] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We have developed a new krypton-krypton interaction-induced isotropic dipole polarizability curve based on high-level ab initio methods. The determination was carried out using the coupled-cluster singles and doubles plus perturbative triples method with very large basis sets up to augmented correlation-consistent sextuple zeta as well as the corrections for core-core and core-valence correlation and relativistic effects. The analytical function of polarizability and our recently constructed reference interatomic potential [J. M. Waldrop et al., J. Chem. Phys. 142, 204307 (2015)] were used to predict the thermophysical and electromagnetic properties of krypton gas. The second pressure, acoustic, and dielectric virial coefficients were computed for the temperature range of 116 K-5000 K using classical statistical mechanics supplemented with high-order quantum corrections. The virial coefficients calculated were compared with the generally less precise available experimental data as well as with values computed from other potentials in the literature {in particular, the recent highly accurate potential of Jäger et al. [J. Chem. Phys. 144, 114304 (2016)]}. The detailed examination in this work suggests that the present theoretical prediction can be applied as reference values in disciplines involving thermophysical and electromagnetic properties of krypton gas.
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Affiliation(s)
- Bo Song
- Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Jonathan M Waldrop
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, USA
| | - Xiaopo Wang
- Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Konrad Patkowski
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, USA
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46
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Kögel JF, Sorokin DA, Khvorost A, Scott M, Harms K, Himmel D, Krossing I, Sundermeyer J. The Lewis superacid Al[N(C 6F 5) 2] 3 and its higher homolog Ga[N(C 6F 5) 2] 3 - structural features, theoretical investigation and reactions of a metal amide with higher fluoride ion affinity than SbF 5. Chem Sci 2018; 9:245-253. [PMID: 29629094 PMCID: PMC5869307 DOI: 10.1039/c7sc03988c] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Accepted: 10/20/2017] [Indexed: 12/26/2022] Open
Abstract
Herein we present the synthesis of the two Lewis acids Al[N(C6F5)2]3 (ALTA) and Ga[N(C6F5)2]3 (GATA) via salt elimination reactions. The metal complexes were characterized by NMR-spectroscopic methods and X-ray diffraction analysis revealing the stabilization of the highly Lewis acidic metal centers by secondary metal-fluorine contacts. The Lewis acidic properties of Al[N(C6F5)2]3 and Ga[N(C6F5)2]3 are demonstrated by reactions with Lewis bases resulting in the formation of metallates accompanied by crucial structural changes. The two metallates [Cs(Tol)3]+[FAl(N(C6F5)2)3]- and [AsPh4]+[ClGa(N(C6F5)2)3]- contain interesting weakly coordinating anions. The reaction of Al[N(C6F5)2]3 with trityl fluoride yielded [CPh3]+[FAl(N(C6F5)2)3]- which could find application in the activation of metallocene polymerization catalysts. The qualitative Lewis acidity of Al[N(C6F5)2]3 and Ga[N(C6F5)2]3 was investigated by means of competition experiments for chloride ions in solution. DFT calculations yielded fluoride ion affinities in the gas phase (FIA) of 555 kJ mol-1 for Al[N(C6F5)2]3 and 472 kJ mol-1 for Ga[N(C6F5)2]3. Thus, Al[N(C6F5)2]3 can be considered a Lewis superacid with a fluoride affinity higher than SbF5 (493 kJ mol-1) whereas the FIA of the corresponding gallium complex is slightly below the threshold to Lewis superacidity.
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Affiliation(s)
- J F Kögel
- Fachbereich Chemie der Philipps-Universität , Hans-Meerwein Str. , 35043 Marburg , Germany .
| | - D A Sorokin
- Fachbereich Chemie der Philipps-Universität , Hans-Meerwein Str. , 35043 Marburg , Germany .
| | - A Khvorost
- Fachbereich Chemie der Philipps-Universität , Hans-Meerwein Str. , 35043 Marburg , Germany .
| | - M Scott
- Fachbereich Chemie der Philipps-Universität , Hans-Meerwein Str. , 35043 Marburg , Germany .
| | - K Harms
- Fachbereich Chemie der Philipps-Universität , Hans-Meerwein Str. , 35043 Marburg , Germany .
| | - D Himmel
- Institut für Anorganische und Analytische Chemie , Freiburger Materialforschungszentrum (FMF) , Freiburg Institute for Advanced Studies (FRIAS) , Section Soft Matter Science , Universität Freiburg , Albertstr. 21 , 79104 Freiburg , Germany
| | - I Krossing
- Institut für Anorganische und Analytische Chemie , Freiburger Materialforschungszentrum (FMF) , Freiburg Institute for Advanced Studies (FRIAS) , Section Soft Matter Science , Universität Freiburg , Albertstr. 21 , 79104 Freiburg , Germany
| | - J Sundermeyer
- Fachbereich Chemie der Philipps-Universität , Hans-Meerwein Str. , 35043 Marburg , Germany .
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47
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Field-Theodore TE, Olejniczak M, Jaszuński M, Wilson DJD. NMR shielding constants in group 15 trifluorides. Phys Chem Chem Phys 2018; 20:23025-23033. [DOI: 10.1039/c8cp04056g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
By combining large basis and complete basis set (CBS) extrapolations of the coupled-cluster equilibrium geometry results with rovibrational and relativistic corrections, we demonstrate that it is possible to achieve near-quantitative accuracy for the NMR shielding constants in three group 15 trifluorides – NF3, PF3 and AsF3.
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Affiliation(s)
- Terri E. Field-Theodore
- Department of Chemistry and Physics
- La Trobe Institute for Molecular Science
- La Trobe University
- Melbourne
- Australia
| | | | - Michał Jaszuński
- Institute of Organic Chemistry
- Polish Academy of Sciences
- 01-224 Warszawa
- Poland
| | - David J. D. Wilson
- Department of Chemistry and Physics
- La Trobe Institute for Molecular Science
- La Trobe University
- Melbourne
- Australia
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48
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Yin Y, Shi D, Sun J, Zhu Z. Potential Energy Curves, Transition Dipole Moments, and Franck-Condon Factors of the 12 Low-Lying States of BrO - Anion. J Phys Chem A 2017; 121:8207-8216. [PMID: 28994291 DOI: 10.1021/acs.jpca.7b07207] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This work investigates the spectroscopic parameters, vibrational levels, and transition probabilities of 12 low-lying states, which are generated from the first dissociation limit, Br(2Pu) + O-(2Pu), of the BrO- anion. The 12 states are X1Σ+, 21Σ+, 11Σ-, 11Π, 21Π, 11Δ, a3Π, 13Σ+, 23Σ+, 13Σ-, 23Π, and 13Δ. The potential energy curves are calculated with the complete active-space self-consistent field method, which is followed by the internally contracted multireference configuration interaction approach with Davidson modification. The dissociation energy D0 of X1Σ+ state is determined to be approximately 26876.44 cm-1, which agrees well with the experimental one of 26494.50 cm-1. Of these 12 states, the 21Σ+, 11Σ-, 21Π, 11Δ, 13Σ+, 23Σ+, 23Π, and 13Δ states are very weakly bound states, whose well depths are only several-hundred cm-1. The a3Π, 23Π, and 13Δ states are inverted and account for the spin-orbit coupling effect. No states are repulsive regardless of whether the spin-orbit coupling effect is included. The spectroscopic parameters and vibrational levels are determined. The transition dipole moments of 12-pair electronic states are calculated. Franck-Condon factors of a number of transitions of more than 20-pair electronic states are evaluated. The electronic transitions are discussed. The spin-orbit coupling effect on the spectroscopic parameters and vibrational properties is profound for all the states except for X1Σ+, a3Π, and 11Π. The spectroscopic parameters and transition probabilities obtained in this paper can provide some powerful guidelines for observing these states in a proper spectroscopy experiment, in particular the states that have very shallow potential wells.
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Affiliation(s)
- Yuan Yin
- College of Physics and Material Science, Henan Normal University , Xinxiang 453007, China
| | - Deheng Shi
- College of Physics and Material Science, Henan Normal University , Xinxiang 453007, China
| | - Jinfeng Sun
- College of Physics and Material Science, Henan Normal University , Xinxiang 453007, China
| | - Zunlue Zhu
- College of Physics and Material Science, Henan Normal University , Xinxiang 453007, China
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49
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Permanent electric dipole moments of PtX (X = H, F, Cl, Br, and I) by the composite approach. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.09.048] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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50
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Solomonik VG, Smirnov AN. Toward Chemical Accuracy in ab Initio Thermochemistry and Spectroscopy of Lanthanide Compounds: Assessing Core–Valence Correlation, Second-Order Spin–Orbit Coupling, and Higher Order Effects in Lanthanide Diatomics. J Chem Theory Comput 2017; 13:5240-5254. [DOI: 10.1021/acs.jctc.7b00408] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Victor G. Solomonik
- Ivanovo State University of Chemistry and Technology, Ivanovo 153000, Russia
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