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Wang K, Liu L, Pan H, Liu Z, Wang Y, Wang C, Zhao J, Chen J, Guo J. Antiferromagnetic Chromium-Doped Tin Clusters. J Phys Chem A 2024; 128:2737-2742. [PMID: 38566323 DOI: 10.1021/acs.jpca.4c00015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
The trend toward further miniaturization of micronano antiferromagnetic (AFM) spintronic devices has led to a strong demand for low-dimensional materials. The assembly of AFM clusters to produce such materials is a potential pathway that promotes studies on such clusters. In this work, we report on the discovery of the AFM Cr2Snx (x = 3-20) clusters with a stepwise growth at the density functional theory (DFT) level. In comparison, the two Cr atoms tend to stay together and be buried by Sn atoms, forming endohedral structures with one Cr atom encapsulated at size 9 and finally forming a full-encapsulated structure at size 17. Each successive cluster size is composed of its predecessor with an extra Sn atom adsorbed onto the face, giving evidence of stepwise growth. All these Cr2Snx (x = 3-20) clusters are antiferromagnets, except for the triplet-state ferrimagnetic Cr2Sn11, and all their singly negatively and positively charged ions are ferromagnets. The found stable Cr2Sn17 cluster can dimerize, yielding dimers and trimers without noticeably distorting the geometrical structure and magnetic properties of each of its constituent cluster monomers, making it possible as a building block for AFM materials.
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Affiliation(s)
- Kai Wang
- Henan Engineering Research Centre of Building-Photovoltaics, School of Mathematics and Physics, Henan University of Urban Construction, Pingdingshan 467036, China
| | - Le Liu
- Henan Engineering Research Centre of Building-Photovoltaics, School of Mathematics and Physics, Henan University of Urban Construction, Pingdingshan 467036, China
| | - Hui Pan
- Henan Engineering Research Centre of Building-Photovoltaics, School of Mathematics and Physics, Henan University of Urban Construction, Pingdingshan 467036, China
| | - Zhiqing Liu
- Henan Engineering Research Centre of Building-Photovoltaics, School of Mathematics and Physics, Henan University of Urban Construction, Pingdingshan 467036, China
| | - Yarui Wang
- Henan Engineering Research Centre of Building-Photovoltaics, School of Mathematics and Physics, Henan University of Urban Construction, Pingdingshan 467036, China
| | - Chaoyong Wang
- Henan Engineering Research Centre of Building-Photovoltaics, School of Mathematics and Physics, Henan University of Urban Construction, Pingdingshan 467036, China
| | - Jun Zhao
- Henan Engineering Research Centre of Building-Photovoltaics, School of Mathematics and Physics, Henan University of Urban Construction, Pingdingshan 467036, China
| | - Jiaye Chen
- Henan Engineering Research Centre of Building-Photovoltaics, School of Mathematics and Physics, Henan University of Urban Construction, Pingdingshan 467036, China
| | - Junji Guo
- Henan Engineering Research Centre of Building-Photovoltaics, School of Mathematics and Physics, Henan University of Urban Construction, Pingdingshan 467036, China
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2
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Wang K, Zhang Y, Wang C, Zhao J, Liu L, Chen J, Wang Y. Discovery of a series of silicon-based ferrimagnets in CrMnSi n (n = 4-20) clusters. J Comput Chem 2024; 45:446-453. [PMID: 37942818 DOI: 10.1002/jcc.27250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 10/23/2023] [Accepted: 10/26/2023] [Indexed: 11/10/2023]
Abstract
Herein, the structural evolution, electronic and magnetic properties of silicon clusters with two different dopants, CrMnSin (n = 4-20) clusters were investigated at density functional theory (DFT) level. Small-sized CrMnSin (n = 4-9) clusters tend to adopt bipyramid-based geometries, while clusters with sizes n = 10 and 11 prefer to opening cage-like structures. For sizes n = 12 to 14, the half-encapsulated structures gradually transform into closed-cage Cr@Sin structures, with the Mn atom exposed outside. Starting from size 15, both the Cr and Mn atoms are completely encapsulated by silicon atoms. Meanwhile, the Cr and Mn atoms in smaller-sized CrMnSin (n = 4-7) clusters tend to be separated, while they prefer to stay together for larger sizes. Cr atom always acts as electron donor, but not for Mn atom. From the average binding energies, one can conclude that it is easier to form larger size clusters. Smaller and larger sized CrMnSin (n = 4-9 and 19-20) clusters prefer to exhibit ferromagnetic Cr-Mn coupling, while sizes n = 10-18 always exhibit ferrimagnetic state. To our knowledge, the CrMnSin clusters is the first kind of neutral transition-metal doped semiconductor clusters that show ferrimagnetic state within a wide size range.
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Affiliation(s)
- Kai Wang
- Henan Engineering Research Centre of Building-Photovoltaics, School of Mathematics and Physics, Henan University of Urban Construction, Pingdingshan, China
| | - Ying Zhang
- Henan Engineering Research Centre of Building-Photovoltaics, School of Mathematics and Physics, Henan University of Urban Construction, Pingdingshan, China
| | - Chaoyong Wang
- Henan Engineering Research Centre of Building-Photovoltaics, School of Mathematics and Physics, Henan University of Urban Construction, Pingdingshan, China
| | - Jun Zhao
- Henan Engineering Research Centre of Building-Photovoltaics, School of Mathematics and Physics, Henan University of Urban Construction, Pingdingshan, China
| | - Le Liu
- Henan Engineering Research Centre of Building-Photovoltaics, School of Mathematics and Physics, Henan University of Urban Construction, Pingdingshan, China
| | - Jiaye Chen
- Henan Engineering Research Centre of Building-Photovoltaics, School of Mathematics and Physics, Henan University of Urban Construction, Pingdingshan, China
| | - Yarui Wang
- Henan Engineering Research Centre of Building-Photovoltaics, School of Mathematics and Physics, Henan University of Urban Construction, Pingdingshan, China
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3
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Marlton SJP, Liu C, Bieske EJ. Bond dissociation energy of FeCr+ determined through threshold photodissociation in a cryogenic ion trap. J Chem Phys 2024; 160:034301. [PMID: 38226822 DOI: 10.1063/5.0188157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Accepted: 12/20/2023] [Indexed: 01/17/2024] Open
Abstract
The bond dissociation energy of FeCr+ is measured using resonance enhanced photodissociation spectroscopy in a cryogenic ion trap. The onset for FeCr+ → Fe + Cr+ photodissociation occurs well above the lowest Cr+(6S, 3d5) + Fe(5D, 3d64s2) dissociation limit. In contrast, the higher energy FeCr+ → Fe+ + Cr photodissociation process exhibits an abrupt onset at the energy of the Cr(7S, 3d54s1) + Fe+(6D, 3d64s1) limit, enabling accurate dissociation energies to be extracted: D(Fe-Cr+) = 1.655 ± 0.006 eV and D(Fe+-Cr) = 2.791 ± 0.006 eV. The measured D(Fe-Cr+) bond energy is 10%-20% larger than predictions from accompanying CAM (Coulomb Attenuated Method)-B3LYP and NEVPT2 and coupled cluster singles, doubles, and perturbative triples electronic structure calculations, which give D(Fe-Cr+) = 1.48, 1.40, and 1.35 eV, respectively. The study emphasizes that an abrupt increase in the photodissociation yield at threshold requires that the molecule possesses a dense manifold of optically accessible, coupled electronic states adjacent to the dissociation asymptote. This condition is not met for the lowest Cr+(6S, 3d5) + Fe(5D, 3d64s2) dissociation limit of FeCr+ but is satisfied for the higher energy Cr(7S, 3d54s1) + Fe+(6D, 3d64s1) dissociation limit.
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Affiliation(s)
- Samuel J P Marlton
- School of Chemistry, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Chang Liu
- School of Chemistry, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Evan J Bieske
- School of Chemistry, The University of Melbourne, Melbourne, Victoria 3010, Australia
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Lucci E, Giarrusso S, Gigli G, Ciccioli A. The AuSc, AuTi, and AuFe molecules: determination of the bond energies by Knudsen Effusion Mass Spectrometry experiments combined with ab initio calculations. J Chem Phys 2022; 157:084303. [DOI: 10.1063/5.0094621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The AuTi gaseous molecule was for the first time identified in vapors produced at high temperature from a gold-titanium alloy. The homogeneous equilibria AuTi(g) = Au(g) + Ti(g) (direct dissociation) and AuTi(g) + Au(g) = Au2(g) + Ti(g) (isomolecular exchange) were studied by Knudsen Effusion Mass Spectrometry (KEMS) in the temperature range 2111 -2229 K. The so determined equilibrium constants were treated by the "third-law method" of thermodynamic analysis, integrated with theoretical calculations, and the dissociation energy at 0 K was derived as (AuTi) = 241.0 {plus minus} 5.2 kJ/mol. A similar investigation was carried out for the AuSc and AuFe species, whose dissociation energies were previously reported with large uncertainties. The direct dissociation and the isomolecular exchange with the Au2 dimer were studied in the 1969-2274 and 1842-2092 K ranges for AuSc and AuFe, respectively, and the dissociation energies derived as (AuSc) = 240.4 {plus minus} 6.0 and (AuFe) = 186.2 {plus minus} 4.2 kJ/mol. The experimental bond energies are compared with those calculated here by CCSD(T) with the correlation-consistent basis sets cc-pVXZ(-PP) and cc-pwCVXZ(-PP) (with X = T,Q,5), also in the limit of complete basis set, and with those from CASSCF-MRCI calculations, recently available in the literature. The stronger bond of AuTi compared to AuFe parallels the trend observed in monochlorides. This analogy is shown to be more generally observed in the AuM and MCl diatomic series (with M = first-row transition metal), in accordance with a picture of "pseudo-halogen" bonding behaviour of gold.
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Affiliation(s)
- Elena Lucci
- University of Rome La Sapienza Department of Chemistry, Italy
| | - Sara Giarrusso
- Chemistry and Biochemistry, University of California Merced, United States of America
| | - Guido Gigli
- University of Rome La Sapienza Department of Chemistry, Italy
| | - Andrea Ciccioli
- Dipartimento di Chimica, University of Rome La Sapienza Department of Chemistry, Italy
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Baudhuin MA, Boopalachandran P, Rajan S, Leopold DG. A Study of NbMo and NbMo - by Anion Photoelectron Spectroscopy. J Phys Chem A 2021; 125:9658-9679. [PMID: 34723518 DOI: 10.1021/acs.jpca.1c07669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Photoelectron spectra of the niobium-molybdenum diatomic anion, obtained at 488 and 514 nm, display vibrationally resolved transitions from the ground state and one excited electronic state of the anion to the ground state and one excited electronic state of the neutral molecule. The electron affinity of NbMo is measured to be 1.130 ± 0.005 eV. Its 2Δ3/2 spin-orbit component is observed to lie 870 ± 20 cm-1 above its previously identified 2Δ5/2 ground state. For 93Nb98Mo, vibrational energies measured for levels up to v = 4 for the 2Δ5/2 and 2Δ3/2 states give harmonic frequency and anharmonicity constant values of ωe = 492 ± 12 cm-1 and ωexe = 8.0 ± 3.2 cm-1, the former value corresponding to a force constant of 6.80 ± 0.35 mdyn/Å. These two vibrational parameters suggest a bond dissociation energy that is too low by at least a factor of 3, indicating that the ground state potential energy curve of NbMo deviates markedly from a Morse potential at higher energies. An excited electronic state of NbMo, assigned as a 2Σ+ state, is observed at 2900 ± 25 cm-1 (T0). Vibrational energies up to v = 8 in this excited state give values of ωe = 544 ± 8 cm-1 and ωexe = 1.9 ± 1.2 cm-1 for 93Nb98Mo. The former value corresponds to a high vibrational force constant of 8.30 ± 0.25 mdyn/Å. Both doublet states of the neutral molecule are accessed from the anion ground state, which is assigned as 1Σ+. For the 93Nb98Mo- anion, the fundamental vibrational frequency (ΔG1/2) is 484 ± 15 cm-1. Electron affinity data indicate that the bond dissociation energy of NbMo- is 0.213 ± 0.005 eV greater than that of neutral NbMo, whose previously reported value then gives D0 = 4.85 ± 0.27 eV for the anion. An excited state of the anion lying 3050 ± 25 cm-1 (T0) above its ground state is assigned as 3Δ, and the energies of its spin-orbit components above the 3Δ3 lowest energy level are measured to be 450 ± 20 cm-1 (3Δ2) and 1100 ± 20 cm-1 (3Δ1). Their uneven spacing suggests that the energy of the 3Δ2 level is lowered by interaction with a higher energy Ω = 2 anion state. The vibrational frequency (ΔG1/2) for the 3Δ1 and 3Δ2 states is measured to be 433 ± 20 cm-1. Bond length differences among the observed states are estimated from Franck-Condon fits to vibrational band intensity profiles. When combined with the previously reported NbMo bond length, these provide bond length estimates for the ground state of the anion (1.940 ± 0.025 Å) and for the observed excited states. These species offer extreme examples of multiple metal-metal bonding, with formal bond orders of 51/2 for the 2Δ ground and 2Σ+ excited doublet states of NbMo, 6 for the singlet ground state of the anion, and 5 for its low-lying triplet state. The relationships among their bonding properties and those of related multiply bonded transition metal dimers are discussed.
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Affiliation(s)
- Melissa A Baudhuin
- Chemistry Department, University of Minnesota, 207 Pleasant Street S.E., Minneapolis, Minnesota55455, United States
| | - Praveenkumar Boopalachandran
- Chemistry Department, University of Minnesota, 207 Pleasant Street S.E., Minneapolis, Minnesota55455, United States
| | - Srijay Rajan
- Chemistry Department, University of Minnesota, 207 Pleasant Street S.E., Minneapolis, Minnesota55455, United States
| | - Doreen Geller Leopold
- Chemistry Department, University of Minnesota, 207 Pleasant Street S.E., Minneapolis, Minnesota55455, United States
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Asymmetric Solvation of the Zinc Dimer Cation Revealed by Infrared Multiple Photon Dissociation Spectroscopy of Zn 2+(H 2O) n ( n = 1-20). Int J Mol Sci 2021; 22:ijms22116026. [PMID: 34199627 PMCID: PMC8199724 DOI: 10.3390/ijms22116026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 05/20/2021] [Accepted: 05/26/2021] [Indexed: 11/17/2022] Open
Abstract
Investigating metal-ion solvation—in particular, the fundamental binding interactions—enhances the understanding of many processes, including hydrogen production via catalysis at metal centers and metal corrosion. Infrared spectra of the hydrated zinc dimer (Zn2+(H2O)n; n = 1–20) were measured in the O–H stretching region, using infrared multiple photon dissociation (IRMPD) spectroscopy. These spectra were then compared with those calculated by using density functional theory. For all cluster sizes, calculated structures adopting asymmetric solvation to one Zn atom in the dimer were found to lie lower in energy than structures adopting symmetric solvation to both Zn atoms. Combining experiment and theory, the spectra show that water molecules preferentially bind to one Zn atom, adopting water binding motifs similar to the Zn+(H2O)n complexes studied previously. A lower coordination number of 2 was observed for Zn2+(H2O)3, evident from the highly red-shifted band in the hydrogen bonding region. Photodissociation leading to loss of a neutral Zn atom was observed only for n = 3, attributed to a particularly low calculated Zn binding energy for this cluster size.
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7
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Revealing noncollinear magnetic ordering at the atomic scale via XMCD. Sci Rep 2021; 11:2996. [PMID: 33542346 PMCID: PMC7862308 DOI: 10.1038/s41598-021-82518-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Accepted: 01/18/2021] [Indexed: 11/08/2022] Open
Abstract
Mass-selected V and Fe monomers, as well as the heterodimer \documentclass[12pt]{minimal}
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\begin{document}$${\text{Fe}}_1{\text{V}}_1$$\end{document}Fe1V1, were deposited on a Cu(001) surface. Their electronic and magnetic properties were investigated via X-ray absorption (XAS) and X-ray magnetic circular dichroism (XMCD) spectroscopy. Anisotropies in the magnetic moments of the deposited species could be examined by means of angle resolving XMCD, i.e. changing the X-ray angle of incidence. A weak adatom-substrate-coupling was found for both elements and, using group theoretical arguments, the ground state symmetries of the adatoms were determined. For the dimer, a switching from antiparallel to parallel orientation of the respective magnetic moments was observed. We show that this is due to the existence of a noncollinear spin-flop phase in the deposited dimers, which could be observed for the first time in such a small system. Making use of the two magnetic sublattices model, we were able to find the relative orientations for the dimer magnetic moments for different incidence angles.
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8
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Harb T, Abdul-Al S. Ab initio investigation of the ground and lowest excited states of the YAl molecule. COMPUT THEOR CHEM 2021. [DOI: 10.1016/j.comptc.2020.113057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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9
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Alizadeh Sanati D, Andrae D. Low-lying electronic terms of diatomic molecules AB ( A = Sc–Ni, B = Cu/Ag/Au). Mol Phys 2020. [DOI: 10.1080/00268976.2020.1772514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Davood Alizadeh Sanati
- Physikalische und Theoretische Chemie, Institut für Chemie und Biochemie, Freie Universität Berlin, Berlin, Germany
| | - Dirk Andrae
- Physikalische und Theoretische Chemie, Institut für Chemie und Biochemie, Freie Universität Berlin, Berlin, Germany
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Vorobyeva E, Gerken VC, Mitchell S, Sabadell-Rendón A, Hauert R, Xi S, Borgna A, Klose D, Collins SM, Midgley PA, Kepaptsoglou DM, Ramasse QM, Ruiz-Ferrando A, Fako E, Ortuño MA, López N, Carreira EM, Pérez-Ramírez J. Activation of Copper Species on Carbon Nitride for Enhanced Activity in the Arylation of Amines. ACS Catal 2020. [DOI: 10.1021/acscatal.0c03164] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Evgeniya Vorobyeva
- Department of Chemistry and Applied Biosciences, ETH Zürich,, Vladimir-Prelog-Weg 1-5, Zürich 8093, Switzerland
| | - Viktoria C. Gerken
- Department of Chemistry and Applied Biosciences, ETH Zürich,, Vladimir-Prelog-Weg 1-5, Zürich 8093, Switzerland
| | - Sharon Mitchell
- Department of Chemistry and Applied Biosciences, ETH Zürich,, Vladimir-Prelog-Weg 1-5, Zürich 8093, Switzerland
| | - Albert Sabadell-Rendón
- Institute of Chemical Research of Catalonia and The Barcelona Institute of Science and Technology, Tarragona 43007, Spain
| | - Roland Hauert
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf 8600, Switzerland
| | - Shibo Xi
- Institute of Chemical and Engineering Sciences, A*STAR, 1 Pesek Road, Jurong Island, Singapore 627833
| | - Armando Borgna
- Institute of Chemical and Engineering Sciences, A*STAR, 1 Pesek Road, Jurong Island, Singapore 627833
| | - Daniel Klose
- Department of Chemistry and Applied Biosciences, ETH Zürich,, Vladimir-Prelog-Weg 1-5, Zürich 8093, Switzerland
| | - Sean M. Collins
- Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB3 0FS, U.K
- School of Chemical and Process Engineering and School of Physics, University of Leeds, Leeds LS2 9JT, U.K
| | - Paul A. Midgley
- Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB3 0FS, U.K
| | - Demie M. Kepaptsoglou
- SuperSTEM Laboratory, SciTech Daresbury Campus, Daresbury WA4 4AD, U.K
- Department of Physics, University of York, York YO10 5DD, U.K
| | - Quentin M. Ramasse
- SuperSTEM Laboratory, SciTech Daresbury Campus, Daresbury WA4 4AD, U.K
- School of Chemical and Process Engineering and School of Physics, University of Leeds, Leeds LS2 9JT, U.K
| | - Andrea Ruiz-Ferrando
- Institute of Chemical Research of Catalonia and The Barcelona Institute of Science and Technology, Tarragona 43007, Spain
| | - Edvin Fako
- Institute of Chemical Research of Catalonia and The Barcelona Institute of Science and Technology, Tarragona 43007, Spain
| | - Manuel A. Ortuño
- Institute of Chemical Research of Catalonia and The Barcelona Institute of Science and Technology, Tarragona 43007, Spain
| | - Núria López
- Institute of Chemical Research of Catalonia and The Barcelona Institute of Science and Technology, Tarragona 43007, Spain
| | - Erick M. Carreira
- Department of Chemistry and Applied Biosciences, ETH Zürich,, Vladimir-Prelog-Weg 1-5, Zürich 8093, Switzerland
| | - Javier Pérez-Ramírez
- Department of Chemistry and Applied Biosciences, ETH Zürich,, Vladimir-Prelog-Weg 1-5, Zürich 8093, Switzerland
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11
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Patel P, Wang J, Wilson AK. Prediction of pK a s of Late Transition-Metal Hydrides via a QM/QM Approach. J Comput Chem 2020; 41:171-183. [PMID: 31495951 DOI: 10.1002/jcc.26057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Accepted: 08/04/2019] [Indexed: 11/09/2022]
Abstract
Three implicit solvation models, the conductor-like polarizable continuum model (C-PCM), the conductor-like screening model (COSMO), and universal implicit solvent model (SMD), combined with a hybrid two layer QM/QM approach (ONIOM), were utilized to calculate the pKa values, using a direct thermodynamic scheme, of a set of Group 10 transition metal (TM) hydrides in acetonitrile. To obtain the optimal combination of quantum methods for ONIOM calculations with implicit solvation models, the influence of factors, such as the choice of density functional and basis set, the atomic radii used to build a cavity in the solvent, and the size of the model system in an ONIOM scheme, was examined. Additionally, the impact of Grimme's empirical dispersion correction and exact exchange was also investigated. The results were calibrated by experimental data. This investigation provides insight about effective models for the prediction of thermodynamic properties of TM-containing complexes with bulky ligands. © 2019 Wiley Periodicals, Inc.
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Affiliation(s)
- Prajay Patel
- Department of Chemistry and Center for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, Denton, Texas, 76203-5017.,Department of Chemistry, Michigan State University, East Lansing, Michigan, 48824-1322
| | - Jiaqi Wang
- Department of Chemistry and Center for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, Denton, Texas, 76203-5017.,Department of Chemistry, Beijing Forestry University, Beijing, China, 100083
| | - Angela K Wilson
- Department of Chemistry and Center for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, Denton, Texas, 76203-5017.,Department of Chemistry, Michigan State University, East Lansing, Michigan, 48824-1322
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12
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Zhang Y, Zhang W, Singh DJ. Localization in the SCAN meta-generalized gradient approximation functional leading to broken symmetry ground states for graphene and benzene. Phys Chem Chem Phys 2020; 22:19585-19591. [DOI: 10.1039/d0cp03567j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
SCAN over localizes orbitals leading to spin symmetry broken ground states in graphene and benzene.
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Affiliation(s)
- Yubo Zhang
- Department of Physics and Shenzhen Institute for Quantum Science & Engineering
- Southern University of Science and Technology
- Shenzhen
- China
- Guangdong Provincial Key Lab for Computational Science and Materials Design, and Shenzhen Municipal Key Lab for Advanced Quantum Materials and Devices
| | - Wenqing Zhang
- Department of Physics and Shenzhen Institute for Quantum Science & Engineering
- Southern University of Science and Technology
- Shenzhen
- China
- Guangdong Provincial Key Lab for Computational Science and Materials Design, and Shenzhen Municipal Key Lab for Advanced Quantum Materials and Devices
| | - David J. Singh
- Department of Physics and Astronomy
- University of Missouri
- Columbia
- USA
- Department of Chemistry
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13
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Li CG, Shen ZG, Zhang J, Gao JH, Li JJ, Sun T, Zhang RJ, Ren BZ, Hu YF. A comparative study of Cu nX (X = Sc, Y; n = 1–10) clusters based on the structures, and electronic and aromatic properties. NEW J CHEM 2019. [DOI: 10.1039/c9nj00236g] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The MO diagrams and orbital contributions of the HOMO and LUMO for the Cu7Sc and Cu7Y clusters.
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Affiliation(s)
- Cheng-Gang Li
- College of Physics and Electronic Engineering
- Quantum Materials Research Center
- Zhengzhou Normal University
- Zhengzhou 450044
- China
| | - Zi-Gang Shen
- College of Physics and Electronic Engineering
- Quantum Materials Research Center
- Zhengzhou Normal University
- Zhengzhou 450044
- China
| | - Jie Zhang
- College of Physics and Electronic Engineering
- Quantum Materials Research Center
- Zhengzhou Normal University
- Zhengzhou 450044
- China
| | - Jin-Hai Gao
- College of Physics and Electronic Engineering
- Quantum Materials Research Center
- Zhengzhou Normal University
- Zhengzhou 450044
- China
| | - Jing-Jie Li
- College of Physics and Electronic Engineering
- Quantum Materials Research Center
- Zhengzhou Normal University
- Zhengzhou 450044
- China
| | - Tong Sun
- College of Physics and Electronic Engineering
- Quantum Materials Research Center
- Zhengzhou Normal University
- Zhengzhou 450044
- China
| | - Ru-Jie Zhang
- College of Physics and Electronic Engineering
- Quantum Materials Research Center
- Zhengzhou Normal University
- Zhengzhou 450044
- China
| | - Bao-Zeng Ren
- School of Chemical Engineering and Energy
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Yan-Fei Hu
- School of Physics and Electronic Engineering
- Sichuan University of Science & Engineering
- Zigong 643000
- China
- National Key Laboratory for Shock Wave and Detonation Physics Research
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14
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Gutsev GL, Weatherford CA, Ramachandran BR, Gutsev LG, Zheng WJ, Thomas OC, Bowen KH. Photoelectron spectra and structure of the Mnn− anions (n = 2–16). J Chem Phys 2015; 143:044306. [DOI: 10.1063/1.4926943] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- G. L. Gutsev
- Department of Physics, Florida A&M University, Tallahassee, Florida 32307, USA
| | - C. A. Weatherford
- Department of Physics, Florida A&M University, Tallahassee, Florida 32307, USA
| | - B. R. Ramachandran
- College of Engineering and Science, Louisiana Tech University, Ruston, Louisiana 71272, USA
| | - L. G. Gutsev
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, USA
| | - W.-J. Zheng
- Departments of Chemistry and Materials Science, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - O. C. Thomas
- Departments of Chemistry and Materials Science, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Kit H. Bowen
- Departments of Chemistry and Materials Science, Johns Hopkins University, Baltimore, Maryland 21218, USA
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15
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Structures, stabilities, electronic and magnetic properties of small RhxMny (x+y=2–4) clusters. COMPUT THEOR CHEM 2014. [DOI: 10.1016/j.comptc.2014.08.008] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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17
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18
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Laury ML, Wilson AK. Performance of Density Functional Theory for Second Row (4d) Transition Metal Thermochemistry. J Chem Theory Comput 2013; 9:3939-46. [DOI: 10.1021/ct400379z] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marie L. Laury
- Center
for Advanced Scientific Computing and Modeling (CASCaM), Department of Chemistry, University of North Texas, Denton, Texas 76203-5017, United States
| | - Angela K. Wilson
- Center
for Advanced Scientific Computing and Modeling (CASCaM), Department of Chemistry, University of North Texas, Denton, Texas 76203-5017, United States
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19
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Clouston LJ, Siedschlag RB, Rudd PA, Planas N, Hu S, Miller AD, Gagliardi L, Lu CC. Systematic Variation of Metal–Metal Bond Order in Metal–Chromium Complexes. J Am Chem Soc 2013; 135:13142-8. [DOI: 10.1021/ja406506m] [Citation(s) in RCA: 111] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Laura J. Clouston
- Department
of Chemistry, University of Minnesota,
207 Pleasant Street SE, Minneapolis,
Minnesota 55455-0431, United States
| | - Randall B. Siedschlag
- Department
of Chemistry, University of Minnesota,
207 Pleasant Street SE, Minneapolis,
Minnesota 55455-0431, United States
| | - P. Alex Rudd
- Department
of Chemistry, University of Minnesota,
207 Pleasant Street SE, Minneapolis,
Minnesota 55455-0431, United States
| | - Nora Planas
- Department
of Chemistry, University of Minnesota,
207 Pleasant Street SE, Minneapolis,
Minnesota 55455-0431, United States
- Supercomputing Institute, and
Chemical Theory Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Shuxian Hu
- Department
of Chemistry, University of Minnesota,
207 Pleasant Street SE, Minneapolis,
Minnesota 55455-0431, United States
- Supercomputing Institute, and
Chemical Theory Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Adam D. Miller
- Department
of Chemistry, University of Minnesota,
207 Pleasant Street SE, Minneapolis,
Minnesota 55455-0431, United States
| | - Laura Gagliardi
- Department
of Chemistry, University of Minnesota,
207 Pleasant Street SE, Minneapolis,
Minnesota 55455-0431, United States
- Supercomputing Institute, and
Chemical Theory Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Connie C. Lu
- Department
of Chemistry, University of Minnesota,
207 Pleasant Street SE, Minneapolis,
Minnesota 55455-0431, United States
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20
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Gutsev GL, Weatherford CW, Belay KG, Ramachandran BR, Jena P. An all-electron density functional theory study of the structure and properties of the neutral and singly charged M12 and M13 clusters: M = Sc–Zn. J Chem Phys 2013; 138:164303. [DOI: 10.1063/1.4799917] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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21
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Yao JG, Yan S, Gong BA, Yu QX, Wang YX. Giant magnetic moments of Pd-doped manganese clusters. Mol Phys 2013. [DOI: 10.1080/00268976.2012.760051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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22
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Jiang W, Laury ML, Powell M, Wilson AK. Comparative Study of Single and Double Hybrid Density Functionals for the Prediction of 3d Transition Metal Thermochemistry. J Chem Theory Comput 2012; 8:4102-11. [PMID: 26605577 DOI: 10.1021/ct300455e] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The performance of 13 density functionals, including hybrid-GGA, hybrid-meta-GGA, and double-hybrid functionals, in combination with the correlation consistent basis sets, has been evaluated for the prediction of gas phase enthalpies of formation for a large set of 3d transition-metal-containing molecules with versatile bonding features. Of the methods studied, the hybrid B97-1 functional and the double hybrid functional mPW2-PLYP exhibit the best overall performance with mean absolute deviations (MAD) from experimental data of 7.2 and 7.3 kcal mol(-1), respectively. For single reference molecules, where dynamic correlation predominates, the results of the hybrid functionals B97-1, B98, and ωB97X and the double hybrid functionals B2-PLYP, B2GP-PLYP, and mPW2-PLYP yield the smallest deviations from the experimental enthalpies of formation. For the prediction of thermodynamic properties of coordination complexes including metal carbonyls, B97-1 and mPW2-PLYP are the most promising functionals of those investigated. When the size of the molecule is considered, B97-1 and B98 outperform mPW2-PLYP for diatomics and triatomics, while mPW2-PLYP yields the lowest MAD for larger molecules.
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Affiliation(s)
- Wanyi Jiang
- Department of Chemistry and Center for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, Denton, Texas 76203-5017, United States
| | - Marie L Laury
- Department of Chemistry and Center for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, Denton, Texas 76203-5017, United States
| | - Mitchell Powell
- Department of Chemistry and Center for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, Denton, Texas 76203-5017, United States
| | - Angela K Wilson
- Department of Chemistry and Center for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, Denton, Texas 76203-5017, United States
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23
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Krechkivska O, Morse MD, Kalemos A, Mavridis A. Electronic spectroscopy and electronic structure of diatomic TiFe. J Chem Phys 2012; 137:054302. [DOI: 10.1063/1.4738958] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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24
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Krechkivska O, Morse MD. ZrFe, a Sextuply-Bonded Diatomic Transition Metal? J Phys Chem A 2012; 117:992-1000. [DOI: 10.1021/jp301096z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Olha Krechkivska
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Michael D. Morse
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
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25
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Jiang W, DeYonker NJ, Wilson AK. Multireference Character for 3d Transition-Metal-Containing Molecules. J Chem Theory Comput 2012; 8:460-8. [DOI: 10.1021/ct2006852] [Citation(s) in RCA: 202] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wanyi Jiang
- Center for Advanced Scientific Computing and Modeling (CASCaM), Department of Chemistry, University of North Texas, Denton, Texas 76203-5070, United States
| | - Nathan J. DeYonker
- Department of Chemistry, University of Memphis, Memphis, Tennessee 38152-3500, United States
| | - Angela K. Wilson
- Center for Advanced Scientific Computing and Modeling (CASCaM), Department of Chemistry, University of North Texas, Denton, Texas 76203-5070, United States
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26
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Jiang W, DeYonker NJ, Determan JJ, Wilson AK. Toward accurate theoretical thermochemistry of first row transition metal complexes. J Phys Chem A 2011; 116:870-85. [PMID: 22107449 DOI: 10.1021/jp205710e] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The recently developed correlation consistent Composite Approach for transition metals (ccCA-TM) was utilized to compute the thermochemical properties for a collection of 225 inorganic molecules containing first row (3d) transition metals, ranging from the monohydrides to larger organometallics such as Sc(C(5)H(5))(3) and clusters such as (CrO(3))(3). Ostentatiously large deviations of ccCA-TM predictions stem mainly from aging and unreliable experimental data. For a subset of 70 molecules with reported experimental uncertainties less than or equal to 2.0 kcal mol(-1), regardless of the presence of moderate multireference character in some molecules, ccCA-TM achieves transition metal chemical accuracy of ±3.0 kcal mol(-1) as defined in our earlier work [J. Phys. Chem. A2007, 111, 11269-11277] by giving a mean absolute deviation of 2.90 kcal mol(-1) and a root-mean-square deviation of 3.91 kcal mol(-1). As subsets are constructed with decreasing upper limits of reported experimental uncertainties (5.0, 4.0, 3.0, 2.0, and 1.0 kcal mol(-1)), the ccCA-TM mean absolute deviations were observed to monotonically drop off from 4.35 to 2.37 kcal mol(-1). In contrast, such a trend is missing for DFT methods as exemplified by B3LYP and M06 with mean absolute deviations in the range 12.9-14.1 and 10.5-11.0 kcal mol(-1), respectively. Salient multireference character, as demonstrated by the T(1)/D(1) diagnostics and the weights (C(0)(2)) of leading electron configuration in the complete active self-consistent field wave function, was found in a significant amount of molecules, which can still be accurately described by the single reference ccCA-TM. The ccCA-TM algorithm has been demonstrated as an accurate, robust, and widely applicable model chemistry for 3d transition metal-containing species with versatile bonding features.
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Affiliation(s)
- Wanyi Jiang
- Center for Advanced Scientific Computing and Modeling (CASCaM), Department of Chemistry, University of North Texas, Denton, Texas 76203-5070, USA
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27
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Diez RP, Franzreb K, Alonso JA. The diatomic dication CuZn2+ in the gas phase. J Chem Phys 2011; 135:034306. [DOI: 10.1063/1.3613624] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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28
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Höltzl T, Veldeman N, De Haeck J, Veszprémi T, Lievens P, Nguyen MT. Growth mechanism and chemical bonding in scandium-doped copper clusters: experimental and theoretical study in concert. Chemistry 2009; 15:3970-82. [PMID: 19296484 DOI: 10.1002/chem.200802372] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Size matters! The electronic structure and size-dependent stability of neutral and cationic scandium-doped copper clusters have been investigated by mass spectrometric studies (for the cations) and also quantum chemical computations. The proposed reaction paths ultimately lead to the most stable Frank-Kasper-shaped Cu(16)Sc(+) cluster (shown here), which could be the germ of a new crystallization process.Electronic structure and size-dependent stability of scandium-doped copper cluster cations, Cu(n)Sc(+), were investigated by using a dual-target dual-laser vaporization production scheme followed by mass spectrometric studies and also quantum chemical computations in the density functional theory framework. The neutral species also were studied by using computational methods. Enhanced abundances and dissociation energies were measured in the case of Cu(n)Sc(+) for n=4, 6, 8, 10 and 16, the last of these identified as being extraordinary stable. Neutral clusters are stable with n=5, 7, 9 and 15, which are isoelectronic with respect to the number of the valence s electrons with the stable cationic clusters; hence a simple electron count determines cluster properties to a great extent. The Cu(17)Sc cluster was found to be a superatomic molecule, containing Cu(16)Sc(+) and Cu(-) units; however, the charge separation is not as pronounced as in the case of CuLi. Cu(15)Sc was found to be a stable cluster with a large dissociation energy and a closed electronic structure; hence this can be regarded as a superatom, analogous to the noble gases. The main factors determining the growth patterns of these clusters are the central position of the scandium atom and the successive filling of the shell orbitals. For smaller clusters, the reaction paths appear to diverge yielding various products; however all paths ultimately lead to the most stable Frank-Kasper shaped Cu(16)Sc cluster, which in turn can be the germ of the crystallization process.
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Affiliation(s)
- Tibor Höltzl
- Department of Chemistry and INPAC-Institute for Nanoscale Physics and Chemistry, Katholieke Universiteit Leuven, 3001 Leuven, Belgium
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29
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Shen N, Wang J, Zhu L. Ab initio study of magnetic properties of bimetallic Co1Mn and Co1V clusters. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.10.073] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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30
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Rinaldo D, Tian L, Harvey JN, Friesner RA. Density functional localized orbital corrections for transition metals. J Chem Phys 2008; 129:164108. [PMID: 19045248 PMCID: PMC2673190 DOI: 10.1063/1.2974101] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2008] [Accepted: 07/30/2008] [Indexed: 11/14/2022] Open
Abstract
This paper describes the development of the B3LYP localized orbital correction model which improves the accuracy of the B3LYP thermochemical predictions for compounds containing transition metals. The development of this model employs a large data set containing 36 experimental atomic energies and 71 bond dissociation energies. B3LYP calculations were carried out on these systems with different basis sets. Based on an electronic structure analysis and physical arguments, we built a set of 10 parameters to correct atomic data and a set of 21 parameters to correct bond dissociation energies. Using the results from our biggest basis set, the model was shown to reduce the mean absolute deviation from 7.7 to 0.4 kcalmol for the atomic data and from 5.3 to 1.7 kcalmol for the bond dissociation energies. The model was also tested using a second basis set and was shown to give relatively accurate results too. The model was also able to predict an outlier in the experimental data that was further investigated with high level coupled-cluster calculations.
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Affiliation(s)
- David Rinaldo
- Department of Chemistry and Center for Biomolecular Simulation, Columbia University, New York, New York 10027, USA
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31
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Williams TG, DeYonker NJ, Wilson AK. Hartree-Fock complete basis set limit properties for transition metal diatomics. J Chem Phys 2008; 128:044101. [PMID: 18247924 DOI: 10.1063/1.2822907] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Numerical Hartree-Fock (HF) energies accurate to at least 1 microhartree are reported for 27 diatomic transition-metal-containing species. The convergence of HF energies toward this numerical limit upon increasing the basis set size has been investigated, where standard nonrelativistic all-electron correlation consistent basis sets and augmented basis sets, developed by Balabanov and Peterson [J. Chem. Phys. 123, 064107 (2005)], were employed. Several schemes which enable the complete basis set (CBS) limit to be determined have been investigated, and the resulting energies have been compared to the numerical Hartree-Fock energies. When comparing basis set extrapolation schemes, those in the form of exponential functions perform well for our test set, with mean absolute deviations from numerical HF energies of 234 and 153 microE(h), when the CBS limit has been determined using a two-point fit as proposed by Halkier et al. [Chem. Phys. Lett. 302, 437 (1999)] on calculations of triple- and quadruple-zeta basis set qualities and calculations of quadruple- and quintuple-zeta basis set qualities, respectively. Overall, extrapolation schemes in the form of a power series are not recommended for the extrapolation of transition metal HF energies. The impact of basis set superposition error has also been examined.
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Affiliation(s)
- T Gavin Williams
- Center for Advanced Scientific Computing and Modeling (CASCaM), Department of Chemistry, University of North Texas, Box 305070, Denton, Texas 76203-5070, USA
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32
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Ouyang Y, Wang J, Hou Y, Zhong X, Du Y, Feng Y. First principle study of AlX (X=3d, 4d, 5d elements and Lu) dimer. J Chem Phys 2008; 128:074305. [PMID: 18298147 DOI: 10.1063/1.2831506] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The ground state equilibrium bond length, harmonic vibrational frequency, and dissociation energy of AlX (X=3d,4d,5d elements and Lu) dimers are investigated by density functional method B3LYP. The present results are in good agreement with the available experimental and other theoretical values except the dissociation energy of AlCr. The present calculations show that the late transition metal can combine strongly with aluminum compared with the former transition metal. The present calculation also indicates that it is more reasonable to replace La with Lu in the Periodic Table and that the bonding strengths of zinc, cadmium, and mercury with aluminum are very weak.
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Affiliation(s)
- Yifang Ouyang
- Department of Physics, Guangxi University, Nanning, PR China.
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33
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Rajchel Ł, Żuchowski PS, Kłos J, Szczȩśniak MM, Chałasiński G. Interactions of transition metal atoms in high-spin states: Cr2, Sc–Cr, and Sc–Kr. J Chem Phys 2007; 127:244302. [DOI: 10.1063/1.2805390] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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34
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Nagarajan R, Morse MD. 1 Pi<--X1 Sigma+ band systems of jet-cooled ScCo and YCo. J Chem Phys 2007; 127:074304. [PMID: 17718610 DOI: 10.1063/1.2756533] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Rotationally resolved resonant two-photon ionization (R2PI) spectra of ScCo and YCo are reported. The measured spectra reveal that these molecules possess ground electronic states of (1)Sigma(+) symmetry, as previously found in the isoelectronic Cr(2) and CrMo molecules. The ground state rotational constants for ScCo and YCo are B(0)(")=0.201 31(22) cm(-1) and B(0) (")=0.120 96(10) cm(-1), corresponding to ground state bond lengths of r(0) (")=1.812 1(10) A and r(0) (")=1.983 0(8) A, respectively. A single electronic band system, assigned as a (1)Pi<--X (1)Sigma(+) transition, has been identified in both molecules. In ScCo, the (1)Pi state is characterized by T(0)=15,428.8, omega(e)(')=246.7, and omega(e)(')x(e)(')=0.73 cm(-1). In YCo, the (1)Pi state has T(0)=13 951.3, omega(e)(')=231.3, and omega(e)(')x(e) (')=2.27 cm(-1). For YCo, hot bands originating from levels up to v(")=3 are observed, allowing the ground state vibrational constants omega(e)(")=369.8, omega(e)(")x(e)(")=1.47, and Delta G(12)(")=365.7 cm(-1) to be deduced. The bond energy of ScCo has been measured as 2.45 eV from the onset of predissociation in a congested vibronic spectrum. A comparison of the chemical bonding in these molecules to related molecules is presented.
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Affiliation(s)
- Ramya Nagarajan
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, USA
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35
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36
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Wang M, Wang B, Chen Z. Magnetic coupling interaction for mixed transition metal dimer: Ab initio MRCI(SD)+Q investigation on CrCu. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2006.12.037] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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37
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Gutsev GL, Mochena MD, Bauschlicher CW. Structure and Properties of Mnn, Mnn-, and Mnn+ Clusters (n = 3−10). J Phys Chem A 2006; 110:9758-66. [PMID: 16884208 DOI: 10.1021/jp062533l] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Electronic and geometrical structures of Mn(3)-Mn(10) together with their singly negatively and positively charged ions are computed using density functional theory with generalized gradient approximation. The ground-state spin multiplicities in the neutral series are 16, 21, 4, 9, 6, 5, 2, and 5, for Mn(3)-Mn(10), respectively. Thus, there is a transition from a ferromagnetic ground state to a ferrimagnetic ground state at Mn(5). The energy difference between ferrimagnetic and ferromagnetic states in Mn(n) grows rapidly with increasing n and exceeds 2 eV in Mn(10). The corresponding change from ferro- to ferrimagnetic ground state occurs at Mn(6)(-) and Mn(3)(+) in the anionic and cationic series, respectively. Beginning with Mn(6), the ion spin multiplicities differ from that of the neutral by +/-1 (i.e., they obey the empirical "+/-1 rule"). We found that the energy required to remove an Mn atom is nearly independent of the charge state of an Mn(n) cluster and the number of atoms in the cluster, except for Mn(3). The results of our calculations are in reasonable agreement with experiment, except for the experimental data on the magnetic moments per atom, where, in general, we predict smaller values than the experiment.
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Affiliation(s)
- G L Gutsev
- Department of Physics, Florida A & M University, Tallahassee, FL 32307, USA.
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Landis CR, Weinhold F. Origin of Trans-Bent Geometries in Maximally Bonded Transition Metal and Main Group Molecules. J Am Chem Soc 2006; 128:7335-45. [PMID: 16734489 DOI: 10.1021/ja060992u] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Recent crystallographic data unambiguously demonstrate that neither Ar'GeGeAr' nor Ar'CrCrAr' molecules adopt the expected linear (VSEPR-like) geometries. Does the adoption of trans-bent geometries indicate that Ar'MMAr' molecules are not "maximally bonded" (i.e., bond order of three for M = Ge and five for M = Cr)? We employ theoretical hybrid density functional (B3LYP/6-311++G) computations and natural bond orbital-based analysis to quantify molecular bond orders and to elucidate the electronic origin of such unintuitive structures. Resonance structures based on quintuple M-M bonding dominate for the transition metal compounds, especially for molybdenum and tungsten. For the main group, M-M bonding consists of three shared electron pairs, except for M = Pb. For both d- and p-block compounds, the M-M bond orders are reflected in torsional barriers, bond-antibond splittings, and heats of hydrogenation in a qualitatively intuitive way. Trans-bent structures arise primarily from hybridization tendencies that yield the strongest sigma-bonds. For transition metals, the strong tendency toward sd-hybridization in making covalent bonds naturally results in bent ligand arrangements about the metal. In the p-block, hybridization tendencies favor high p-character, with increasing avidity as one moves down the Group 14 column, and nonlinear structures result. In both the p-block and the d-block, bonding schemes have easily identifiable Lewis-like character but adopt somewhat unconventional orbital interactions. For more common metal-metal multiply bonded compounds such as [Re2Cl8]2-, the core Lewis-like fragment [Re2Cl4]2+ is modified by four hypervalent three-center/four-electron additions.
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Affiliation(s)
- Clark R Landis
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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39
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Sproviero EM, Gascon JA, McEvoy JP, Brudvig GW, Batista VS. Characterization of synthetic oxomanganese complexes and the inorganic core of the O2-evolving complex in photosystem II: Evaluation of the DFT/B3LYP level of theory. J Inorg Biochem 2006; 100:786-800. [PMID: 16510187 DOI: 10.1016/j.jinorgbio.2006.01.017] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2005] [Revised: 01/08/2006] [Accepted: 01/09/2006] [Indexed: 11/21/2022]
Abstract
The capabilities and limitations of the Becke-3-Lee-Yang-Parr (B3LYP) hybrid density functional are investigated as applied to studies of mixed-valent multinuclear oxomanganese complexes. Benchmark calculations involve the analysis of structural, electronic and magnetic properties of di-, tri- and tetra-nuclear Mn complexes, previously characterized both chemically and spectroscopically, including the di-mu-oxo bridged dimers [Mn(III)Mn(IV)(mu-O)(2)(H(2)O)(2)(terpy)(2)](3+) (terpy=2,2':6,2''-terpyridine) and [Mn(III)Mn(IV)(mu-O)(2)(phen)(4)](3+) (phen=1,10-phenanthroline), the Mn trimer [Mn(3)O(4)(bpy)(4)(H(2)O)(2)](4+) (bpy=2,2'-bipyridine), and the tetramer [Mn(4)O(4)L(6)](+) with L=Ph(2)PO(2)(-). Furthermore, the density functional theory (DFT) B3LYP level is applied to analyze the hydrated Mn(3)O(4)CaMn cluster completely ligated by water, OH(-), Cl(-), carboxylate and imidazole ligands, analogous to the '3+1 Mn tetramer' of the oxygen-evolving complex of photosystem II. It is found that DFT/B3LYP predicts structural and electronic properties of oxomanganese complexes in pre-selected spin-electronic states in very good agreement with X-ray and magnetic experimental data, even when applied in conjunction with rather modest basis sets. However, it is conjectured that the energetics of low-lying spin-states is beyond the capabilities of the DFT/B3LYP level, constituting a limitation to mechanistic studies of multinuclear oxomanganese complexes where until now the performance of DFT/B3LYP has raised little concern.
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Affiliation(s)
- Eduardo M Sproviero
- Department of Chemistry, Yale University, 225 Prospect Street, P.O. Box 208107, New Haven, CT 06520-8107, USA
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Furche F, Perdew JP. The performance of semilocal and hybrid density functionals in 3d transition-metal chemistry. J Chem Phys 2006; 124:044103. [PMID: 16460145 DOI: 10.1063/1.2162161] [Citation(s) in RCA: 425] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We investigate the performance of contemporary semilocal and hybrid density functionals for bond energetics, structures, dipole moments, and harmonic frequencies of 3d transition-metal (TM) compounds by comparison with gas-phase experiments. Special attention is given to the nonempirical metageneralized gradient approximation (meta-GGA) of Tao, Perdew, Staroverov, and Scuseria (TPSS) [Phys. Rev. Lett. 91, 146401 (2003)], which has been implemented in TURBOMOLE for the present work. Trends and error patterns for classes of homologous compounds are analyzed, including dimers, monohydrides, mononitrides, monoxides, monofluorides, polyatomic oxides and halogenides, carbonyls, and complexes with organic pi ligands such as benzene and cyclopentadienyl. Weakly bound systems such as Ca(2), Mn(2), and Zn(2) are discussed. We propose a reference set of reaction energies for benchmark purposes. Our all-electron results with quadruple zeta valence basis sets validate semilocal density-functional theory as the workhorse of computational TM chemistry. Typical errors in bond energies are substantially larger than in (organic) main group chemistry, however. The Becke-Perdew'86 [Phys. Rev. A 38, 3098 (1988); Phys. Rev. B 33, 8822 (1986)] GGA and the TPSS meta-GGA have the best price/performance ratio, while the TPSS hybrid functional achieves a slightly lower mean absolute error in bond energies. The popular Becke three-parameter hybrid B3LYP underbinds significantly and tends to overestimate bond distances; we give a possible explanation for this. We further show that hybrid mixing does not reduce the width of the error distribution on our reference set. The error of a functional for the s-d transfer energy of a TM atom does not predict its error for TM bond energies and bond lengths. For semilocal functionals, self-interaction error in one- and three-electron bonds appears to be a major source of error in TM reaction energies. Nevertheless, TPSS predicts the correct ground-state symmetry in the vast majority of cases and rarely fails qualitatively. This further confirms TPSS as a general purpose functional that works throughout the periodic table. We also give workstation timing comparisons for the 645-atom protein crambin.
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Affiliation(s)
- Filipp Furche
- Institut für Physikalische Chemie, Universität Karlsruhe, Kaiserstrasse 12, 76128 Karlsruhe, Germany.
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Schlangen M, Schröder D, Schwarz H. Gas-Phase Reactions of Homo- and Heteronuclear Clusters MM′+ (M, M′=Fe, Co, Ni) with Linear Alkanenitriles. Helv Chim Acta 2005. [DOI: 10.1002/hlca.200590113] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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