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Maltsev AP, Charkin OP. Theoretical Modeling of Exo- and Endohedral Hydrogenation Reactions of the Doped Magnesium Cluster Mg17Ni. RUSS J INORG CHEM+ 2021. [DOI: 10.1134/s0036023621120111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Structural and electronic properties of neutral and anionic magnesium clusters doped with two barium atoms. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117622] [Citation(s) in RCA: 7] [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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Bista D, Sengupta T, Khanna SN. Massive dipoles across the metal-semiconductor cluster interface: towards chemically controlled rectification. Phys Chem Chem Phys 2021; 23:18975-18982. [PMID: 34612436 DOI: 10.1039/d1cp02420e] [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
An interface between a metallic cluster (MgAl12) and a semiconducting cluster (Re6Se8(PMe3)5) is shown to be marked by a massive dipole reminiscent of a dipolar layer leading to a Schottky barrier at metal-semiconductor interfaces. The metallic cluster MgAl12 with a valence electron count of 38 electrons is two electrons short of 40 electrons needed to complete its electronic shells in a superatomic model and is marked by a significant electron affinity of 2.99 eV. On the other hand, the metal-chalcogenide semiconducting cluster Re6Se8(PMe3)5, consisting of a Re6Se8 core ligated with five trimethylphosphine ligands, is highly stable in the +2 charge-state owing to its electronic shell closure, and has a low ionization energy of 3.3 eV. The composite cluster Re6Se8(PMe3)5-MgAl12 formed by combining the MgAl12 cluster through the unligated site of Re6Se8(PMe3)5 exhibits a massive dipole moment of 28.38 D resulting from a charge flow from Re6Se8(PMe3)5 to the MgAl12 cluster. The highest occupied molecular orbital (HOMO) of the composite cluster is on the MgAl12 side, which is 0.53 eV below the lowest unoccupied molecular orbital (LUMO) localized on the Re6Se8(PMe3)5 cluster, reminiscent of a Schottky barrier at metal-semiconductor interfaces. Therefore, the combination can act as a rectifier, and an application of a voltage of approximately 4.1 V via a homogeneous external electric field is needed to overcome the barrier aligning the two states: the HOMO in MgAl12 with the LUMO in Re6Se8(PMe3)5. Apart from the bias voltage, the barrier can also be reduced by attaching ligands to the metallic cluster, which provides chemical control over rectification. Finally, the fused cluster is shown to be capable of separating electron-hole pairs with minimal recombination, offering the potential for photovoltaic applications.
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Affiliation(s)
- Dinesh Bista
- Department of Physics, Virginia Commonwealth University, Richmond, VA 23284-2000, USA.
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Charkin OP, Maltsev AP. Density Functional Theory Modeling of Reactions of Addition of H 2 Molecules to Magnesium Clusters Mg 17M Doped with Atoms M of Transition 3d Elements. J Phys Chem A 2021; 125:2308-2315. [PMID: 33720723 DOI: 10.1021/acs.jpca.1c00211] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Density functional theory calculations of potential energy surface (PES) have been performed for elementary hydrogenation reactions Mg17M + H2 → Mg17MH2 of magnesium clusters Mg17M doped by transition 3d metals (M = Ti-Ni), and for consecutive reactions Mg17Ni + nH2 → Mg17NiH2n of addition of n hydrogen molecules to Ni-doped clusters Mg17Ni and Mg17NiH2. Energetic, geometric, and spectroscopic features of intermediates and transition states along the minimum energy pathway have been found, and their trends were analyzed with dopants changing along the 3d series and with increasing number of atoms H attached to the surface positions of the magnesium backbone.
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Affiliation(s)
- Oleg P Charkin
- Institute of Problems of Chemical Physics, Russian Academy of Science, Chernogolovka, Moscow Region 142432, Russia
| | - Alexey P Maltsev
- Lomonosov Moscow State University, Leninskie Gory 1, Moscow 111991, Russia
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Zhang L, Ma X, Guo X, Wang N, Huang S. Probing the Geometric and Electronic Effects of Aluminum–Magnesium Clusters on Reactivity Toward Oxygen. J CLUST SCI 2021. [DOI: 10.1007/s10876-020-01803-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Maltsev AP, Charkin OP. Theoretical Modeling of Addition Reactions of an H2 Molecule to Mg17L Magnesium Clusters Doped with 3d Metals. RUSS J INORG CHEM+ 2020. [DOI: 10.1134/s0036023620080100] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Anumula R, Reber AC, An P, Cui C, Guo M, Wu H, Luo Z, Khanna SN. Ligand accommodation causes the anti-centrosymmetric structure of Au 13Cu 4 clusters with near-infrared emission. NANOSCALE 2020; 12:14801-14807. [PMID: 32627782 DOI: 10.1039/d0nr02448a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We synthesized an [Au13Cu4(PPh3)4(SPy)8]+ nanocluster co-capped by phosphine and thiolate ligands. Interestingly, this Au13Cu4 cluster corresponds to an anti-centrosymmetric structure with the four copper atoms coordinated to the mixed ligands on the same side of the Au13 icosahedron, which is in sharp contrast to the [Au13Cu4(PPh2Py)4(SPhtBu)8]+ and [Au13Cu2(PPh3)6(SPy)6]+ clusters which possess highly symmetric structures with well-separated Cu adatoms. Both [Au13Cu4(PPh3)4(SPy)8]+ and [Au13Cu2(PPh3)6(SPy)6]+ clusters correspond to 8 valence electron superatoms with large HOMO-LUMO gaps, respectively. The difference in structure is rooted in the nature of the mixed ligands, with the bidentate SPy binding strongly to Cu on both binding sites (-N-Cu and Au-SR-Cu) leading to the co-linking of adjacent Cu atoms, while the bidentate PPh2Py binds Cu on one site and Au on the other giving rise to a separation of the Cu atoms even in the presence of relatively higher monomer concentration. Both [Au13Cu4(PPh3)4(SPy)8]+ and [Au13Cu2(PPh3)6(SPy)6]+ display emissions in the near-IR regions. TD-DFT calculations reproduce the spectroscopic results with specified excited states, shedding light on the geometric and electronic behaviors of the ligand-protected Au13Mx clusters.
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Affiliation(s)
- Rajini Anumula
- Beijing National Laboratory for Molecular Sciences (BNLMS) and State Key Laboratory for Structural Chemistry of Unstable and Stable Species, and Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P.R. China.
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Maltsev AP, Charkin OP. Theoretical Modeling of Stepwise Addition of H2 Molecules to Magnesium Clusters Mg18 and Mg17Ni. RUSS J INORG CHEM+ 2020. [DOI: 10.1134/s0036023620020114] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Tang J, Zhang C, Chen H. C/N/O centred metal clusters: super valence bonding and magic structure with 26 valence electrons. Mol Phys 2020. [DOI: 10.1080/00268976.2019.1642526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Jianling Tang
- College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou, People’s Republic of China
| | - Cairong Zhang
- Department of Applied Physics, Lanzhou University of Technology, Lanzhou, People’s Republic of China
| | - Hongshan Chen
- College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou, People’s Republic of China
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Armstrong A, Zhang H, Reber AC, Jia Y, Wu H, Luo Z, Khanna SN. Al Valence Controls the Coordination and Stability of Cationic Aluminum–Oxygen Clusters in Reactions of Aln+ with Oxygen. J Phys Chem A 2019; 123:7463-7469. [DOI: 10.1021/acs.jpca.9b05646] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Albert Armstrong
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Hanyu Zhang
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences; University of Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Arthur C. Reber
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Yuhan Jia
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences; University of Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Haiming Wu
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences; University of Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Zhixun Luo
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences; University of Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Shiv N. Khanna
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States
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Armstrong A, Reber AC, Khanna SN. Multiple-Valence Aluminum and the Electronic and Geometric Structure of Al nO m Clusters. J Phys Chem A 2019; 123:5114-5121. [PMID: 31146532 DOI: 10.1021/acs.jpca.9b01729] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Electronic stability in aluminum clusters is typically associated with either closed electronic shells of delocalized electrons or a +3 oxidation state of aluminum. To investigate whether there are alternative routes toward electronic stability in aluminum oxide clusters, we used theoretical methods to examine the geometric and electronic structure of Al nO m (2 ≤ n ≤ 7; 1 ≤ m ≤ 10) clusters. Electronically stable clusters with large HOMO-LUMO (highest occupied molecular orbital and lowest unoccupied molecular orbital) gaps were identified and could be grouped into two categories. (1) Al2 nO3 n clusters with a +3 oxidation state on the aluminum and (2) planar clusters including Al4O4, Al5O3, Al6O5, and Al6O6. The structures of the planar clusters have external Al atoms bound to a single O atom. Their electronic stability is explained by the multiple-valence Al sites, with the internal Al atoms having an oxidation state of +3, whereas the external Al atoms have an oxidation state of +1.
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Affiliation(s)
- Albert Armstrong
- Department of Physics , Virginia Commonwealth University , Richmond , Virginia 23284 , United States
| | - Arthur C Reber
- Department of Physics , Virginia Commonwealth University , Richmond , Virginia 23284 , United States
| | - Shiv N Khanna
- Department of Physics , Virginia Commonwealth University , Richmond , Virginia 23284 , United States
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Ishibashi C, Matsuzawa H. Theoretical Study of the Relationship between the Geometry and the Orbital Hybridization in the CuAl n− (n = 11–13) Cluster. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2018. [DOI: 10.1246/bcsj.20170416] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Chiaki Ishibashi
- Department of Life and Environmental Sciences, Faculty of Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-8588, Japan
| | - Hidenori Matsuzawa
- Department of Life and Environmental Sciences, Faculty of Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-8588, Japan
- Department of Applied Chemistry, Faculty of Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-8588, Japan
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