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Doust Mohammadi M, Bhowmick S, Maisser A, Schmidt-Ott A, Biskos G. Electronic properties and collision cross sections of AgO kH m± ( k, m = 1-4) aerosol ionic clusters. Phys Chem Chem Phys 2024; 26:14547-14560. [PMID: 38721799 DOI: 10.1039/d3cp05499c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/23/2024]
Abstract
Experimental evidence shows that hydroxylated metal ions are often produced during cluster synthesis by atmospheric pressure spark ablation. In this work, we predict the ground state equilibrium structures of AgOkHm± clusters (k and m = 1-4), which are readily produced when spark ablating Ag, using the coupled cluster with singles and doubles (CCSD) method. The stabilization energy of these clusters is calculated with respect to the dissociation channel having the lowest energy, by accounting perturbative triples corrections to the CCSD method. The interatomic interactions in each of the systems have been investigated using the frontier molecular orbital (FMO), natural bond orbital (NBO) and quantum theory of atoms in molecules (QTAIM) methods. Many of the ground states of these ionic clusters are found to be stable, corroborating experimental observations. We find that clusters having singlet spin states are more stable in terms of dissociation than the clusters that have doublet or triplet spin states. Our calculations also indicate a strong affinity of the ionic and neutral Ag atom towards water and hydroxyl radicals or ions. Many 3-center, 4-electron (3c/4e) hyperbonds giving rise to more than one resonance structure are identified primarily for the anionic clusters. The QTAIM analysis shows that the O-H and O-Ag bonds in the clusters of both polarities are respectively covalent and ionic. The FMO analysis indicates that the anionic clusters are more reactive than the cationic ones. Using the cluster structures predicted by the CCSD method, we calculate the collision cross sections of the AgOkHm± family, with k and m ranging from 1 to 4, by the trajectory method. In turn, we predict the electrical mobilities of these clusters when suspended in helium at atmospheric pressure and compare them with experimental measurements.
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Affiliation(s)
- Mohsen Doust Mohammadi
- Climate & Atmosphere Research Centre, The Cyprus Institute, 20 Konstantinou Kavafi Street, Nicosia 2121, Cyprus.
| | - Somnath Bhowmick
- Climate & Atmosphere Research Centre, The Cyprus Institute, 20 Konstantinou Kavafi Street, Nicosia 2121, Cyprus.
| | - Anne Maisser
- Climate & Atmosphere Research Centre, The Cyprus Institute, 20 Konstantinou Kavafi Street, Nicosia 2121, Cyprus.
| | - Andreas Schmidt-Ott
- Climate & Atmosphere Research Centre, The Cyprus Institute, 20 Konstantinou Kavafi Street, Nicosia 2121, Cyprus.
- Faculty of Applied Sciences, Delft University of Technology, Delft, 2629 HZ, The Netherlands
| | - George Biskos
- Climate & Atmosphere Research Centre, The Cyprus Institute, 20 Konstantinou Kavafi Street, Nicosia 2121, Cyprus.
- Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, 2628 CN, The Netherlands
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2
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Ding P, Braim M, Hobson AL, Rochford LA, Ryan PTP, Duncan DA, Lee TL, Hussain H, Costantini G, Yu M, Woodruff DP. Does F 4TCNQ Adsorption on Cu(111) Form a 2D-MOF? THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2023; 127:20903-20910. [PMID: 37908743 PMCID: PMC10614301 DOI: 10.1021/acs.jpcc.3c04927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Revised: 09/21/2023] [Indexed: 11/02/2023]
Abstract
The results of a quantitative experimental structural investigation of the adsorption phases formed by 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyanoquinodimethane (F4TCNQ) on Cu(111) are reported. A particular objective was to establish whether Cu adatoms are incorporated into the molecular overlayer. A combination of normal incidence X-ray standing waves, low-energy electron diffraction, scanning tunneling microscopy, and X-ray photoelectron spectroscopy measurements, complemented by dispersion-inclusive density functional theory calculations, demonstrates that F4TCNQ on Cu(111) does cause Cu adatoms to be incorporated into the overlayer to form a two-dimensional metal-organic framework (2D-MOF). This conclusion is shown to be consistent with the behavior of F4TCNQ adsorption on other coinage metal surfaces, despite an earlier report concluding that the adsorption structure on Cu(111) is consistent with the absence of any substrate reconstruction.
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Affiliation(s)
- Pengcheng Ding
- Department
of Physics, University of Warwick, Coventry CV4 7AL, U.K.
- Laboratory
for Space Environment and Physical Sciences, School of Chemistry and
Chemical Engineering, Harbin Institute of
Technology, Harbin 150001, China
| | - Mona Braim
- Department
of Physics, University of Warwick, Coventry CV4 7AL, U.K.
| | - A. L. Hobson
- Department
of Physics, University of Warwick, Coventry CV4 7AL, U.K.
- Diamond
Light Source, Harwell Science and Innovation
Campus, Didcot, Oxford OX11 0DE, U.K.
| | - L. A. Rochford
- Diamond
Light Source, Harwell Science and Innovation
Campus, Didcot, Oxford OX11 0DE, U.K.
| | - P. T. P. Ryan
- Diamond
Light Source, Harwell Science and Innovation
Campus, Didcot, Oxford OX11 0DE, U.K.
- Department
of Materials, Imperial College London, London SW7 2AZ, U.K.
| | - D. A. Duncan
- Diamond
Light Source, Harwell Science and Innovation
Campus, Didcot, Oxford OX11 0DE, U.K.
| | - T.-L. Lee
- Diamond
Light Source, Harwell Science and Innovation
Campus, Didcot, Oxford OX11 0DE, U.K.
| | - H. Hussain
- Diamond
Light Source, Harwell Science and Innovation
Campus, Didcot, Oxford OX11 0DE, U.K.
| | - G. Costantini
- Department
of Chemistry, University of Warwick, Coventry CV4 7AL, U.K.
- School of
Chemistry, University of Birmingham, Birmingham B15 2TT, U.K.
| | - Miao Yu
- Laboratory
for Space Environment and Physical Sciences, School of Chemistry and
Chemical Engineering, Harbin Institute of
Technology, Harbin 150001, China
| | - D. P. Woodruff
- Department
of Physics, University of Warwick, Coventry CV4 7AL, U.K.
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Harris RM, Zhu Z, Tufekci BA, Deepika, Jena P, Peterson KA, Bowen KH. Electronic Structure and Anion Photoelectron Spectroscopy of Uranium-Gold Clusters UAu n-, n = 3-7. J Phys Chem A 2023; 127:7186-7197. [PMID: 37590893 DOI: 10.1021/acs.jpca.3c03452] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/19/2023]
Abstract
A collaborative effort between experiment and theory toward elucidating the electronic and molecular structures of uranium-gold clusters is presented. Anion photoelectron spectra of UAun-(n = 3-7) were taken at the third (355 nm) and fourth (266 nm) harmonics of a Nd:YAG laser, as well as excimer (ArF 193 nm) photon energies, where the experimental adiabatic electron affinities and vertical detachment energies values were measured. Complementary first-principles calculations were subsequently carried out to corroborate experimentally determined electron detachment energies and to determine the geometry and electronic structure for each cluster. Except for the ring-like neutral isomer of UAu6 where one unpaired electron is spread over the Au atoms, all other neutral and anionic UAun clusters (n = 3-7) were calculated to possess open-shell electrons with the unpaired electrons localized on the central U atom. The smaller clusters closely resemble the analogous UFn species, but significant deviations are seen starting with UAu5 where a competition between U-Au and Au-Au bonding begins to become apparent. The UAu6 system appears to mark a transition where Au-Au interactions begin to dominate, where both a ring-like and two heavily distorted octahedral structures around the central U atom are calculated to be nearly isoenergetic. With UAu7, only ring-like structures are calculated. Overall, the calculated electron detachment energies are in good agreement with the experimental values.
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Affiliation(s)
- Rachel M Harris
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Zhaoguo Zhu
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Burak A Tufekci
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Deepika
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Purusottam Jena
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Kirk A Peterson
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States
| | - Kit H Bowen
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
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Nhat PV, Si NT, Fielicke A, Kiselev VG, Nguyen MT. A new look at the structure of the neutral Au 18 cluster: hollow versus filled golden cage. Phys Chem Chem Phys 2023; 25:9036-9042. [PMID: 36919716 DOI: 10.1039/d2cp05422a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
Abstract
The geometry of the neutral Au18 gold cluster was probed by a combination of quantum chemical calculations and far-infrared multiple photon dissociation (FIR-MPD) spectroscopy of a Kr messenger complex. Two low-lying isomers are identified to potentially contribute to the experimental IR spectrum, both being derived from a star-like Au17 structure upon capping with one extra Au atom either inside (18_1) or outside (18_5) the star. In particular, the present detection of structure 18_1 by DFT computations where a golden cage encapsulates an endohedral Au atom, is intriguing as a stable core-shell isomer has, to our knowledge, never been found before for such small neutral gold clusters. DFT and local coupled-cluster (DLPNO and PNO-CCSD(T)) computations indicate that both Au18 isomers are close to each other, within ∼3 kcal mol-1, on the energy scale. Although the exact energy ordering is again method-dependent and remains, at present, inconclusive, the most striking spectral signatures of both isomers are related to vibrational modes localized at atoms capping the inner pentaprism sub-structure that result in prominent peaks centered at ∼80 cm-1, close to the most prominent experimental feature found at 78 cm-1. The calculated IR spectra of both core-shell and hollow isomers are very similar to each other and both agree comparably well with the experimental FIR-MPD spectra of the Au18Kr1,2 complexes.
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Affiliation(s)
- Pham Vu Nhat
- Department of Chemistry, Can Tho University, Can Tho, Vietnam.,Molecular and Materials Modeling Laboratory, Can Tho University, Can Tho, Vietnam
| | - Nguyen Thanh Si
- Department of Chemistry, Can Tho University, Can Tho, Vietnam
| | - André Fielicke
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, Berlin, Germany
| | - Vitaly G Kiselev
- Novosibirsk State University, 1 Pirogova Str., 630090 Novosibirsk, Russia.,Institute of Chemical Kinetics and Combustion SB RAS, 3 Institutskaya Str., 630090 Novosibirsk, Russia
| | - Minh Tho Nguyen
- Institute for Computational Science and Technology (ICST), Ho Chi Minh City, Vietnam.
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The Au12 Gold Cluster: Preference for a Non-Planar Structure. Symmetry (Basel) 2022. [DOI: 10.3390/sym14081665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The transition point from a two-dimensional (2D) to a three-dimensional (3D) structure in a series of small gold clusters remains a topic of continuing debate. In the present study, coupled-cluster CCSD(T) and DFT calculations are performed to re-examine the relative energies of several low-lying isomers of Au12, aiming to shed new light on this issue. At odds with many previous reports on the preference of a planar di-capped elongated-hexagon structure, the Au12 size is found to energetically prefer a globular cup-like form with C2v symmetry. While DFT results are not able to assign the most stable form of Au12 as the relative energies between the lowest-lying isomers are strongly functional-dependent, coupled-cluster theory calculations point out the preference of a 3D structure for having a D3h symmetry. Such a prediction is further supported by a comparison of the vibrational spectra computed using the revTPSS density functional with the available experimental infrared ones that were previously recorded from the far-IR multiple photon dissociation (FIR-MPD) experiment.
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Nhat PV, Si NT, Kiselev VG, Fielicke A, Pham HT, Nguyen MT. Unexpected structures of the Au 17 gold cluster: the stars are shining. Chem Commun (Camb) 2022; 58:5785-5788. [PMID: 35451431 DOI: 10.1039/d2cc00891b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Au17 gold cluster was experimentally produced in the gas phase and characterized by its vibrational spectrum recorded using far-IR multiple photon dissociation (FIR-MPD) of Au17Kr. DFT and coupled-cluster theory PNO-LCCSD(T)-F12 computations reveal that, at odds with most previous reports, Au17 prefers two star-like forms derived from a pentaprism added by two extra Au atoms on both top and bottom surfaces of the pentaprism, along with five other Au atoms each attached on a lateral face. A good agreement between calculated and FIR-MPD spectra indicates a predominant presence of these star-like isomers. Stabilization of a star form arises from strong orbital interactions of an Au12 core with a five-Au-atom string.
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Affiliation(s)
- Pham Vu Nhat
- Department of Chemistry, Can Tho University, Can Tho, Vietnam
| | - Nguyen Thanh Si
- Department of Chemistry, Can Tho University, Can Tho, Vietnam
| | - Vitaly G Kiselev
- Novosibirsk State University, 1 Pirogova Str., 630090 Novosibirsk, Russia.,Institute of Chemical Kinetics and Combustion SB RAS, 3 Institutskaya Str., 630090 Novosibirsk, Russia
| | - André Fielicke
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Hung Tan Pham
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Minh Tho Nguyen
- Institute for Computational Science and Technology (ICST), Ho Chi Minh City, Vietnam.
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Sakr NI, Kizilkaya O, Carlson SF, Chan S, Oumnov RA, Catano J, Kurtz RL, Hall RW, Poliakoff ED, Sprunger PT. Formation of Environmentally Persistent Free Radicals (EPFRs) on the Phenol-Dosed α-Fe 2O 3(0001) Surface. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2021; 125:21882-21890. [PMID: 34992708 PMCID: PMC8725784 DOI: 10.1021/acs.jpcc.1c04298] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Environmentally persistent free radicals (EPFRs) are a class of toxic air pollutants that are found to form by the chemisorption of substituted aromatic molecules on the surface of metal oxides. In this study, we employ X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS) to perform a temperature-dependent study of phenol adsorption on α-Fe2O3(0001) to probe the radical formation mechanism by monitoring changes in the electronic structure of both the adsorbed phenol and metal oxide substrate. Upon dosing at room temperature, new phenol-derived electronic states have been clearly observed in the UPS spectrum at saturation coverage. However, upon dosing at high temperature (>200 °C), both photoemission techniques have shown distinctive features that strongly suggest electron transfer from adsorbed phenol to Fe2O3 surface atoms and consequent formation of a surface radical. Consistent with the experiment, DFT calculations show that phenoxyl adsorption on the iron oxide surface at RT leads to a minor charge transfer to the adsorbed molecule. The experimental findings at high temperatures agree well with the EPFRs' proposed formation mechanism and can guide future experimental and computational studies.
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Affiliation(s)
- N I Sakr
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Orhan Kizilkaya
- Center for Advanced Microstructures and Devices, Louisiana State University, Baton Rouge, Louisiana 70806, United States
| | - Sierra F Carlson
- Department of Natural Sciences and Mathematics, Dominican University of California, San Rafael, California 94901, United States
| | - Simon Chan
- Department of Natural Sciences and Mathematics, Dominican University of California, San Rafael, California 94901, United States
| | - Reuben A Oumnov
- Department of Natural Sciences and Mathematics, Dominican University of California, San Rafael, California 94901, United States
| | - Jaqueline Catano
- Department of Natural Sciences and Mathematics, Dominican University of California, San Rafael, California 94901, United States
| | - Richard L Kurtz
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States; Center for Advanced Microstructures and Devices, Louisiana State University, Baton Rouge, Louisiana 70806, United States
| | - Randall W Hall
- Department of Natural Sciences and Mathematics, Dominican University of California, San Rafael, California 94901, United States; Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - E D Poliakoff
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Phillip T Sprunger
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States; Center for Advanced Microstructures and Devices, Louisiana State University, Baton Rouge, Louisiana 70806, United States
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Nhat PV, Si NT, Duong LV, Nguyen MT. Comment on 'Structural characterization, reactivity and vibrational properties of silver clusters: a new global minimum for Ag 16' by P. L. Rodríguez-Kessler, A. R. Rodríguez-Domínguez, D. MacLeod Carey and A. Muñoz-Castro, Phys. Chem. Chem. Phys., 2020, 22, 27255, DOI: D0CP04018E. Phys Chem Chem Phys 2021; 23:12900-12903. [PMID: 34042917 DOI: 10.1039/d1cp00646k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A recent paper by Rodríguez-Kessler et al., Phys. Chem. Chem. Phys., 2020, 22, 27255-27262, reported not only results of quantum chemical computations (using the PW91 density functional) on Ag16 clusters as emphasized in the article's title, but also on the Ag15 size. These authors confirmed previous results obtained by McKee and Samokhvalov (J. Phys. Chem. A, 2017, 121, 5018-5028 using the M06 density functional) that the most stable isomer of Ag15 is a C2v structure. We wish to point out that two low symmetry isomers of Ag15 that have a similar energy content are even lower in energy than their reported C2v global minimum. The relative energies between low-lying Ag15 isomers were again found to be method-dependent, and within the expected accuracy of DFT and CCSD(T) methods they could be considered as energetically degenerate, and likely coexist in a molecular beam. The new lower-energy Ag15 isomers appear to fit more consistently within the structural evolution of small silver clusters.
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Affiliation(s)
- Pham Vu Nhat
- Department of Chemistry, Can Tho University, Can Tho, Vietnam.
| | - Nguyen Thanh Si
- Department of Chemistry, Can Tho University, Can Tho, Vietnam.
| | - Long Van Duong
- Institute for Computational Science and Technology (ICST), Ho Chi Minh City, Vietnam.
| | - Minh Tho Nguyen
- Institute for Computational Science and Technology (ICST), Ho Chi Minh City, Vietnam.
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