1
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Das S, Nigam S, Sharma P, Majumder C. Evolution of the atomic and electronic structures of CuO clusters: a comprehensive study using the DFT approach. Phys Chem Chem Phys 2024; 26:11506-11515. [PMID: 38586893 DOI: 10.1039/d3cp06235j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
One of the most fundamental aspects of cluster science is to understand the structural evolution at the atomic scale. In this connection, here we report a comprehensive study of the atomic and electronic structures of (CuO)n clusters for n = 1 to 12 using DFT-based formalisms. Both the plane wave-based pseudo-potential approach and LCAO-MO-based method have been employed to obtain the ground state geometries of neutral, cation and anion copper oxide clusters. The results reveal that neutral copper oxide clusters favor a planar ring structure up to heptamer and from octamer onwards they adopt a three-dimensional motif with (CuO)9 and (CuO)12 forming a barrel-shaped layered structure. Detailed electronic structure analysis reveals that the transition of the atomic structure from 2D to 3D is guided by the energy balance of the Cu-O (d-p) and Cu-Cu (d-d) bonds. The removal of one electron from the cluster (cation) results in slightly stretched bonds while the addition of one electron (anion) showed compression in the overall geometries. The thermodynamic and electronic stability of these clusters has been analyzed by estimating their binding energy, ionization energy and electron affinity as a function of size. Remarkably, among these clusters, the octamer (CuO)8 and dodecamer (CuO)12 show higher binding energy and electron affinity (∼6.5 eV) with lower ionization energy (5.5-6.0 eV). This unique feature of the octamer and dodecamer indicates that they are very promising candidates for both oxidizing and reducing agents in different important chemical reactions.
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Affiliation(s)
- Soumitra Das
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai Homi Bhabha National Institute (HBNI), Mumbai, India.
| | - Sandeep Nigam
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai Homi Bhabha National Institute (HBNI), Mumbai, India.
| | - Pramod Sharma
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai Homi Bhabha National Institute (HBNI), Mumbai, India.
| | - Chiranjib Majumder
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai Homi Bhabha National Institute (HBNI), Mumbai, India.
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2
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Huang B, Gan W, Hansen K, Luo Z. What Determines the Drastic Reactivity of Nb n+ Clusters with Nitric Oxide under Thermalized Conditions? J Phys Chem A 2022; 126:4801-4809. [PMID: 35830281 DOI: 10.1021/acs.jpca.2c03977] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report an in-depth study of the adsorption and reaction of NO with cationic Nbn+ (n = 1-20) clusters under thermalized conditions in a laminar flow tube reactor in tandem with a customized triple quadrupole mass spectrometer (FT-TQMS). It is found that the small-sized Nbn+ clusters (2 ≤ n ≤ 7) readily react with NO giving rise to dominant fragmentation products pertaining to the loss of a stable diatomic molecule NbO or NbN. In contrast, the reaction products of larger-sized clusters (n ≥ 10) proceed through diverse channels, including NO adsorption, N2/N2O release, and even NO2 formation. These experimental observations provided the incentive for us to dig deep into the reaction mechanism with the help of DFT calculations. In contrast to the NO-donation coordination in transition metal complexes, here the cationic Nbn+ clusters exhibit dominant electronic donation in initiating the reactions with NO molecules. We fully demonstrated the reaction rate constants, compared the reaction energy diagram of typical Nbn+ clusters, and unveiled the distinct interaction mechanism of niobium clusters available for NO activation and conversion.
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Affiliation(s)
- Benben Huang
- Beijing National Laboratory of Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.,School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wen Gan
- Beijing National Laboratory of Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.,School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Klavs Hansen
- Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China
| | - Zhixun Luo
- Beijing National Laboratory of Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.,School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
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3
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Arakawa M, Horioka M, Minamikawa K, Kawano T, Terasaki A. Reaction of nitric oxide molecules on transition-metal-doped silver cluster cations: size- and dopant-dependent reaction pathways. Phys Chem Chem Phys 2021; 23:22947-22956. [PMID: 34622905 DOI: 10.1039/d1cp02882k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report size- and dopant-dependent reaction pathways as well as reactivity of gas-phase free AgnM+ (M = Sc-Ni) clusters interacting with NO. The reactivity of AgnM+, except for M = Cr and Mn, exhibits a minimum at a specific size, where the cluster cation possesses 18 or 20 valence electrons consisting of Ag 5s and dopant's 3d and 4s. The product ions range from NO adducts, AgnM(NO)m+, and oxygen adducts, AgnMOm+, to NO2 adducts, AgnM(NO2)m+. At small sizes, AgnMOm+ are the major products for M = Sc-V, whereas AgnM(NO)m+ dominate the products for M = Cr-Ni in striking contrast. In both cases, these reaction products are reminiscent of those from an atomic transition metal. However, the reaction pathways are different at least for M = Sc and Ti; kinetics measurements reveal that the present oxygen adducts are formed via NO adducts, while, for example, Ti+ is known to produce TiO+ directly by reaction with a single NO molecule. At larger sizes, on the other hand, AgnM(NO2)m+ are dominantly produced regardless of the dopant element because the dopant atom is encapsulated by the Ag host; the NO2 formation on the cluster is similar to that reported for undoped Agn+.
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Affiliation(s)
- Masashi Arakawa
- Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
| | - Masataka Horioka
- Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
| | - Kento Minamikawa
- Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
| | - Tomoki Kawano
- Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
| | - Akira Terasaki
- Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
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4
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Wang H, Miyajima K, Kudoh S, Mafuné F. Effect of atomicity on the oxidation of cationic copper clusters studied using thermal desorption spectrometry. Phys Chem Chem Phys 2019; 21:23129-23135. [PMID: 31609369 DOI: 10.1039/c9cp03892b] [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
The resistivity to oxidation of small copper clusters, Cun+ (n ≤ 5), in the gas phase with a precise atomicity at the molecular level was investigated using a combination of thermal desorption spectrometry and mass spectrometry. Oxide clusters, CunOm+, with more O atoms than those present with a stoichiometry of n : m = 1 : 1 were produced at room temperature in the presence of O2, and the weakly bound excess oxygen atoms involved in the clusters were removed by post heating. Non-oxidized Cu2+ and Cu3+ clusters were formed in the range of 323-923 K, whereas partially oxidized clusters, Cu4O2+ and Cu5O2+, were generated for n = 4 and 5. Considering the fact that CunOm+ (m = n/2 + 1) tends to be generated for n ≥ 6, the small copper clusters were concluded to be resistive to oxidation. The possible reaction paths for the oxidation of Cu2+ and Cu4+ clusters were obtained by density functional calculations, which were consistent with the experimental findings. The oxidation states of the Cu atoms in the clusters were discussed based on the natural charges of the atoms.
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Affiliation(s)
- Haohao Wang
- Department of Basic Science, School of Arts and Sciences, The University of Tokyo, Komaba, Meguro, Tokyo 153-8902, Japan.
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5
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Abdul Latif M, Wu JWJ, Moriyama R, Nakano M, Ohshimo K, Misaizu F. Stable Compositions and Structures of Copper Oxide Cluster Cations Cu n O m + ( n = 2-8) Studied by Ion Mobility Mass Spectrometry. ACS OMEGA 2018; 3:18705-18713. [PMID: 31458436 PMCID: PMC6643848 DOI: 10.1021/acsomega.8b02466] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Accepted: 12/18/2018] [Indexed: 06/10/2023]
Abstract
Stable compositions and structures of copper oxide cluster cations have been studied by ion mobility mass spectrometry (IMMS) and density functional theory calculations. Cluster ions of the series Cu n O m + were predominantly observed with n:m ≈ 2:1 in the mass spectrum. Collision cross sections (CCSs) of the cluster ions with n:m ≈ 2:1, determined by IMMS, were found to increase monotonically with cluster size. In addition, the CCSs of Cu n O n + and Cu n O n-1 + (n = 2-8) were examined, and stepwise increases were observed for Cu n O n-1 + series. These cluster structures were assigned by comparison of the CCSs obtained via the IMMS experiment with theoretical orientation-averaged CCSs of optimized structures.
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Affiliation(s)
- M. Abdul Latif
- Department of Chemistry,
Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Jenna W. J. Wu
- Department of Chemistry,
Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Ryoichi Moriyama
- Department of Chemistry,
Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Motoyoshi Nakano
- Department of Chemistry,
Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Keijiro Ohshimo
- Department of Chemistry,
Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Fuminori Misaizu
- Department of Chemistry,
Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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6
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Thuy PT, Thao Linh DT, Giang VTH, Cuong NT, Minh Hue NT. Theoretical investigation of the mechanism of indirect decomposition of nitrous oxide (N 2
O) by hydrogen (H 2
) on Cu 7
cluster. VIETNAM JOURNAL OF CHEMISTRY 2018. [DOI: 10.1002/vjch.201800088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Phan Thi Thuy
- Faculty of Chemistry and Center for Computational Science; Hanoi National University of Education; Viet Nam
- School of Natural Sciences Education; Vinh University; Viet Nam
| | - Dao Thi Thao Linh
- Faculty of Chemistry and Center for Computational Science; Hanoi National University of Education; Viet Nam
| | - Vu Thi Huong Giang
- Faculty of Chemistry and Center for Computational Science; Hanoi National University of Education; Viet Nam
| | - Ngo Tuan Cuong
- Faculty of Chemistry and Center for Computational Science; Hanoi National University of Education; Viet Nam
| | - Nguyen Thi Minh Hue
- Faculty of Chemistry and Center for Computational Science; Hanoi National University of Education; Viet Nam
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7
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Zhou S, Sun X, Yue L, Schlangen M, Schwarz H. Selective C-O Coupling Hidden in the Thermal Reaction of [Al 2 CuO 5 ] + with Methane. Chemistry 2018; 24:14649-14653. [PMID: 30091489 DOI: 10.1002/chem.201804059] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Indexed: 01/09/2023]
Abstract
The thermal gas-phase reaction of [Al2 CuO5 ]+ with methane has been explored by using FT-ICR mass spectrometry complemented by high-level quantum chemical calculations. The generation of atomic [Cu]+ from the [Al2 CuO5 ]+ /CH4 couple corresponds to the only reaction channel. Labeling experiments and computational studies strongly suggest that methane activation is indeed involved in the production of [Cu]+ , and generation of CH2 O prevails. Mechanistic aspects and the associated doping effects are discussed.
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Affiliation(s)
- Shaodong Zhou
- Zhejiang Provincial Key Laboratory of, Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, 310027, Hangzhou, P.R. China.,Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 135, 10623, Berlin, Germany
| | - Xiaoyan Sun
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 135, 10623, Berlin, Germany
| | - Lei Yue
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 135, 10623, Berlin, Germany
| | - Maria Schlangen
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 135, 10623, Berlin, Germany
| | - Helmut Schwarz
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 135, 10623, Berlin, Germany
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8
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Liu CG, Sun C, Jiang MX, Zhang YT. Computational study on the catalytic cycle for reduction of NO to N2 catalyzed by a ruthenium–substituted Keggin-type polyoxometalate. COMPUT THEOR CHEM 2018. [DOI: 10.1016/j.comptc.2018.08.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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9
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Hirabayashi S, Ichihashi M. Effects of Second-Metal (Al, V, Co) Doping on the NO Reactivity of Small Rhodium Cluster Cations. J Phys Chem A 2017; 121:2545-2551. [PMID: 28319381 DOI: 10.1021/acs.jpca.6b11613] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reactions of pure and doped rhodium cluster cations, RhnX+ (n = 2-6; X = Al, V, Co, Rh), with NO molecules were investigated at near-thermal energy using a guided ion beam tandem mass spectrometer. We found that the doping with Al and V increases the total reaction cross section mostly. Under single-collision conditions, Rh2X+ reacts with NO to produce Rh2N+ with release of metal monoxide, XO, whereas RhnX+ (n = 3-6) adsorb NO. For the specific clusters RhnAl+ (n = 3 and 4) and RhnV+ (n = 4-6), the NO adsorption is often accompanied by the release of one Rh atom. In addition, we examined the reactions of Rh5X+ (X = Al, V, Co, Rh) with NO under multiple-collision conditions and observed the cluster dioxide formation and the N2 release, i.e., NO decomposition. Particularly, the V-doping is most effective for the NO decomposition. One possible explanation for the present results is that the formation of a stable dopant metal-oxygen bond directly leads to the increase of NO dissociative adsorption energy and the reduction of the energy barrier between the molecular and dissociative adsorption, thereby encouraging the NO decomposition on the small RhnX+ clusters studied.
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Affiliation(s)
- Shinichi Hirabayashi
- East Tokyo Laboratory, Genesis Research Institute, Inc. , 717-86 Futamata, Ichikawa, Chiba 272-0001, Japan
| | - Masahiko Ichihashi
- Cluster Research Laboratory, Toyota Technological Institute: in East Tokyo Laboratory, Genesis Research Institute, Inc. , 717-86 Futamata, Ichikawa, Chiba 272-0001, Japan
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10
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Ma J, Cao X, Chen M, Yin B, Xing X, Wang X. Low-Temperature Disproportionation Reaction of NO on Au 6-: A Mechanism Involving Three NO Molecules Promoted by the Negative Charge. J Phys Chem A 2016; 120:9131-9137. [PMID: 27790914 DOI: 10.1021/acs.jpca.6b09129] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Conversion of NO to other nitrogen oxides is an elementary step in its catalytic removal processes. On coinage metal surfaces, two kinds of NO activation mechanisms have been well documented: the unimolecular dissociation of NO generates two adsorbed atoms, and the dissociation of an adsorbed (NO)2 unit generates an adsorbed O and a free N2O. In this work, we observed a disproportionation mechanism involving three NO molecules on Au6- at a very low temperature (150 K), in which an adsorbed (NO)2 reacts with a free NO forming an adsorbed NO2 and a free N2O. The density functional theory (DFT) calculations indicated that this disproportionation step is significantly exothermic and has a very low activation barrier. The charge distributions on the involved cluster complexes and the correlation between the activity and the electronic properties of Au6- indicate the important role of extra negative charge in all reaction steps. The disproportionation mechanism revealed in this work could possibly exist in the NO removal processes on real gold catalysts.
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Affiliation(s)
- Jun Ma
- Shanghai Key Lab of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University , 1239 Siping Road, Shanghai 200092, P. R. China
| | - Xizi Cao
- Shanghai Key Lab of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University , 1239 Siping Road, Shanghai 200092, P. R. China
| | - Mengyi Chen
- Shanghai Key Lab of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University , 1239 Siping Road, Shanghai 200092, P. R. China
| | - Baoqi Yin
- Shanghai Key Lab of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University , 1239 Siping Road, Shanghai 200092, P. R. China
| | - Xiaopeng Xing
- Shanghai Key Lab of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University , 1239 Siping Road, Shanghai 200092, P. R. China
| | - Xuefeng Wang
- Shanghai Key Lab of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University , 1239 Siping Road, Shanghai 200092, P. R. China
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11
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Yeh CH, Ho JJ. Density Functional Theory Calculation on the Dissociation Mechanism of Nitric Oxide Catalyzed by Cu4Cluster in ZSM-5 (Cu4-ZSM-5) and Bimetal Cu3Fe in ZSM-5 (Cu3Fe-ZSM-5). J CHIN CHEM SOC-TAIP 2016. [DOI: 10.1002/jccs.201500318] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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12
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Hirabayashi S, Ichihashi M. Reactions of Ti- and V-Doped Cu Cluster Cations with Nitric Oxide and Oxygen: Size Dependence and Preferential NO Adsorption. J Phys Chem A 2016; 120:1637-43. [DOI: 10.1021/acs.jpca.6b00206] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shinichi Hirabayashi
- East Tokyo Laboratory, Genesis Research Institute, Inc., 717-86
Futamata, Ichikawa, Chiba 272-0001, Japan
| | - Masahiko Ichihashi
- Cluster Research
Laboratory, Toyota Technological Institute: in East Tokyo Laboratory, Genesis Research Institute, Inc., 717-86 Futamata, Ichikawa, Chiba 272-0001, Japan
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13
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Zhao YX, Liu QY, Zhang MQ, He SG. Reactions of metal cluster anions with inorganic and organic molecules in the gas phase. Dalton Trans 2016; 45:11471-95. [DOI: 10.1039/c6dt01246a] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Progress on the activation and transformation of important inorganic and organic molecules by negatively charged bare metal clusters as well as ligated systems with oxygen, carbon, and nitrogen, among others.
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Affiliation(s)
- Yan-Xia Zhao
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Qing-Yu Liu
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Mei-Qi Zhang
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Sheng-Gui He
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
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14
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Ma J, Cao X, Liu H, Yin B, Xing X. The adsorption and activation of NO on silver clusters with sizes up to one nanometer: interactions dominated by electron transfer from silver to NO. Phys Chem Chem Phys 2016; 18:12819-27. [DOI: 10.1039/c6cp01156j] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Evidence for NO unitary adsorption, the formation of (NO)2 and the reduction to form N2O is observed on silver clusters with sizes up to one nanometer. The adsorption and activation of NO are enhanced by electron transfer from silver to NO.
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Affiliation(s)
- Jun Ma
- Department of Chemistry, and Shanghai Key Lab of Chemical Assessment and Sustainability
- Tongji University
- Shanghai
- China
| | - Xizi Cao
- Department of Chemistry, and Shanghai Key Lab of Chemical Assessment and Sustainability
- Tongji University
- Shanghai
- China
| | - Hao Liu
- Department of Chemistry, and Shanghai Key Lab of Chemical Assessment and Sustainability
- Tongji University
- Shanghai
- China
| | - Baoqi Yin
- Department of Chemistry, and Shanghai Key Lab of Chemical Assessment and Sustainability
- Tongji University
- Shanghai
- China
| | - Xiaopeng Xing
- Department of Chemistry, and Shanghai Key Lab of Chemical Assessment and Sustainability
- Tongji University
- Shanghai
- China
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15
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Hirabayashi S, Ichihashi M. Stability of Aluminum-Doped Copper Cluster Cations and Their Reactivity toward NO and O2. J Phys Chem A 2015; 119:8557-64. [PMID: 26234301 DOI: 10.1021/acs.jpca.5b04018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Aluminum-doped copper cluster cations, CunAl(+), were produced via an ion sputtering method and analyzed by mass spectrometry. The measured size distributions show that Cu6Al(+) and Cu18Al(+) are highly stable species, which can be understood in terms of the electronic subshell 1P and 2S closings, respectively. Furthermore, the reactions of size-selected CunAl(+) (n = 4-6 and 8-16) with NO and O2 were studied at near thermal energies by using a tandem-type mass spectrometer. The doping of an Al atom improves the reactivity of the clusters toward NO in particular for n = 9, 11, 13, and 15, whereas it does not change the reactivity toward O2 significantly. Consequently, it was found that CunAl(+) (n = 9, 11, 13 and 15) are more reactive toward NO than toward O2. The high reactivity of Cu9Al(+) toward NO compared to that of Cu10(+) is explained in terms of the increase of the adsorption energy and the lowering of the barrier to dissociative adsorption, with the aid of calculations based on density functional theory. Moreover, the multiple-collision reactions of CunAl(+) (n = 9, 11, and 13) with NO result in the production of cluster dioxides, Cun-3AlO2(+), (i.e., release of N2), which clearly indicates that NO decomposition proceeds on these clusters.
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Affiliation(s)
- Shinichi Hirabayashi
- †East Tokyo Laboratory, Genesis Research Institute, Inc., 717-86 Futamata, Ichikawa, Chiba 272-0001, Japan
| | - Masahiko Ichihashi
- ‡Cluster Research Laboratory, Toyota Technological Institute: in East Tokyo Laboratory, Genesis Research Institute, Inc., 717-86 Futamata, Ichikawa, Chiba 272-0001, Japan
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