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Fries DV, Klein MP, Straßner A, Huber ME, Luczak M, Wiehn C, Niedner-Schatteburg G. Cryo IR spectroscopy and cryo kinetics of dinitrogen activation and cleavage by small tantalum cluster cations. J Chem Phys 2023; 159:164303. [PMID: 37873960 DOI: 10.1063/5.0157217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Accepted: 09/18/2023] [Indexed: 10/25/2023] Open
Abstract
We investigate small tantalum clusters Tan+, n = 2-4, for their capability to cleave N2 adsorption spontaneously. We utilize infrared photon dissociation (IR-PD) spectroscopy of isolated and size selected clusters under cryogenic conditions within a buffer gas filled ion trap, and we augment our experiments by quantum chemical simulations (at DFT level). All Tan+ clusters, n = 2-4, seem to cleave N2 efficiently. We confirm and extend a previous study under ambient conditions on Ta2+ cluster [Geng et al., Proc. Natl. Acad. Sci. U. S. A. 115, 11680-11687 (2018)]. Our cryo studies and the concomitant DFT simulations of the tantalum trimer Ta3+ suggest cleavage of the first and activation of the second and third N2 molecule across surmountable barriers and along much-involved multidimensional reaction paths. We unravel the underlying reaction processes and the intermediates involved. The study of the N2 adsorbate complexes of Ta4+ presented here extends our earlier study and previously published spectra from (4,m), m = 1-5 [Fries et al., Phys. Chem. Chem. Phys. 23(19), 11345-11354 (2021)], up to m = 12. We confirm the priory published double activation and nitride formation, succeeded by single side-on N2 coordination. Significant red shifts of IR-PD bands from these side-on coordinated μ2-κN:κN,N N2 ligands correlate with the degree of tilting towards the second coordinating Ta center. All subsequently attaching N2 adsorbates onto Ta4+ coordinate in an end-on fashion, and we find clear evidence for co-existence of end-on coordination isomers. The study of stepwise N2 adsorption revealed adsorption limits m(max) of [Tan(N2)m]+ which increase with n, and kinetic fits revealed significant N2 desorption rates upon higher N2 loads. The enhanced absolute rate constants of the very first adsorbate steps kabs(n,0) of the small Ta3+ and Ta4+ clusters independently suggest dissociative N2 adsorption and likely N2 cleavage into Ta nitrides.
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Affiliation(s)
- Daniela V Fries
- Department of Chemistry and State Research Center OPTIMAS, Rheinland-Pfälzische Technische Universität (RPTU) Kaiserslautern-Landau, 67663 Kaiserslautern, Germany
| | - Matthias P Klein
- Department of Chemistry and State Research Center OPTIMAS, Rheinland-Pfälzische Technische Universität (RPTU) Kaiserslautern-Landau, 67663 Kaiserslautern, Germany
| | - Annika Straßner
- Department of Chemistry and State Research Center OPTIMAS, Rheinland-Pfälzische Technische Universität (RPTU) Kaiserslautern-Landau, 67663 Kaiserslautern, Germany
| | - Maximilian E Huber
- Department of Chemistry and State Research Center OPTIMAS, Rheinland-Pfälzische Technische Universität (RPTU) Kaiserslautern-Landau, 67663 Kaiserslautern, Germany
| | - Maximilian Luczak
- Department of Chemistry and State Research Center OPTIMAS, Rheinland-Pfälzische Technische Universität (RPTU) Kaiserslautern-Landau, 67663 Kaiserslautern, Germany
| | - Christopher Wiehn
- Department of Chemistry and State Research Center OPTIMAS, Rheinland-Pfälzische Technische Universität (RPTU) Kaiserslautern-Landau, 67663 Kaiserslautern, Germany
| | - Gereon Niedner-Schatteburg
- Department of Chemistry and State Research Center OPTIMAS, Rheinland-Pfälzische Technische Universität (RPTU) Kaiserslautern-Landau, 67663 Kaiserslautern, Germany
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2
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Levin N, Margraf JT, Lengyel J, Reuter K, Tschurl M, Heiz U. CO 2-Activation by size-selected tantalum cluster cations (Ta 1-16+): thermalization governing reaction selectivity. Phys Chem Chem Phys 2022; 24:2623-2629. [PMID: 35029252 DOI: 10.1039/d1cp04469a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactions of tantalum cluster cations of different sizes toward carbon dioxide are studied in an ion trap under multi-collisional conditions. For all sizes studied, consecutive reactions with several CO2 molecules are observed. This reveals two different pathways, namely oxide formation and the pickup of an entire molecule. Supported by calculations of the thermochemistry of TanO+ formation upon reaction with CO2, changes in the branching ratios at a particular cluster size are related to heat effects due to the vibrational heat capacity of the clusters and the exothermicity of the reaction.
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Affiliation(s)
- Nikita Levin
- Lehrstuhl für Physikalische Chemie, Chemistry Department & Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4, Garching 85748, Germany.
| | - Johannes T Margraf
- Lehrstuhl für Theoretische Chemie, Chemistry Department & Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4, Garching 85748, Germany.,Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, Berlin D-14195, Germany
| | - Jozef Lengyel
- Lehrstuhl für Physikalische Chemie, Chemistry Department & Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4, Garching 85748, Germany.
| | - Karsten Reuter
- Lehrstuhl für Theoretische Chemie, Chemistry Department & Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4, Garching 85748, Germany.,Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, Berlin D-14195, Germany
| | - Martin Tschurl
- Lehrstuhl für Physikalische Chemie, Chemistry Department & Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4, Garching 85748, Germany.
| | - Ulrich Heiz
- Lehrstuhl für Physikalische Chemie, Chemistry Department & Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4, Garching 85748, Germany.
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3
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Han L, Jiang GD, Li XN, He SG. Global optimization of Tan clusters by deep neural network. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.139118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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4
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Fries DV, Klein MP, Steiner A, Prosenc MH, Niedner-Schatteburg G. Observation and mechanism of cryo N 2 cleavage by a tantalum cluster. Phys Chem Chem Phys 2021; 23:11345-11354. [PMID: 33960990 DOI: 10.1039/d0cp06208a] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
We explore the cryogenic kinetics of N2 adsorption to Ta4+ and the infrared signatures of [Ta4(N2)m]+ complexes, m = 1-5. This is accomplished by N2 exposure of isolated ions within a cryogenic ion trap. We find stepwise addition of numerous N2 molecules to the Ta4+ cluster. Interestingly, the infrared signatures of the [Ta4(N2)1]+ and [Ta4(N2)2]+ products are special: there are no NN stretching bands. This is consistent with cleavage of the first two adsorbed dinitrogen molecules. DFT calculations reveal intermediates and barriers along reaction paths of N2 cleavage in support of these experimental findings. We indicate the identified multidimensional path of N2 cleavage as an across edge-above surface (AEAS) mechanism: initially end-on coordinated N2 bends towards a neighboring Ta-atom which yields a second intermediate, with a μ2 bonded N2 across an edge of the Ta4+ tetrahedron core. Further rearrangement above a Ta-Ta-Ta surface of the Ta4+ tetrahedron results in a μ3 bonded N2 ligand. This intermediate relaxes swiftly by ultimate NN cleavage unfolding into the final dinitrido motif. Submerged activation barriers below the entrance channel confirm spontaneous cleavage of the first two dinitrogen molecules (-59 and -33 kJ mol-1, respectively), while cleavage of the third N2 ligand is kinetically hindered (+55 kJ mol-1). We recognize that substoichiometric N2 exposure allows for spontaneous activation by Ta4+, while higher N2 exposure causes self-poisoning.
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Affiliation(s)
- Daniela V Fries
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany.
| | - Matthias P Klein
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany.
| | - Annika Steiner
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany.
| | - Marc H Prosenc
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany.
| | - Gereon Niedner-Schatteburg
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany.
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5
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Lei X, Zhang H, Jia Y, Luo Z. Gas-phase preparation and the stability of superatomic Nb 11O 15. Phys Chem Chem Phys 2021; 23:15766-15773. [PMID: 34286767 DOI: 10.1039/d1cp02128a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a study of the reactions of pure metal clusters Nbn- with dioxygen in the gas phase. It is found that the presence of low-concentration dioxygen reactants results in oxygen-addition products, whereas sufficient high-concentration dioxygen enables oxygen-etching reactions giving rise to molecular niobium oxides. Interestingly, in the presence of a suitable gas flow rate of an intermediate dioxygen concentration, a highly selective product Nb11O15- shows up in the mass spectra. Utilizing density functional theory (DFT) calculations, we have discussed the reactivities of Nbn- (3 ≤ n ≤ 14) clusters with oxygen, and unveiled the reasonable stability of Nb11O15- pertaining to its unique geometric structure with a D5h Nb@Nb10 core fully protected by 15 bridge-oxygen atoms. The oxygen-passivated Nb@Nb10O15- cluster exhibits a large HOMO-LUMO gap (1.46 eV) and effective multicenter bonds with remarkable superatom orbitals for all the 26 valence electrons of the Nb@Nb10 core corresponding to well-staggered energy levels. We illustrate the superatomic features in the Nb@Nb10 metallic core for which the adaptive natural density partitioning (AdNDP) analysis unveils thirteen 11c-2e bonds. Among them, one of the 11c-2e bonds accounts for the superatomic S orbital, three bonds correspond to superatomic P orbitals, another five display vivid D orbital characteristics, and the remaining four 11c-2e bonds are assigned to F orbital features. In addition, the net atomic charge of the center Nb atom is as high as -0.804 |e| rendering core-shell electrostatic interactions and the shielding effect of the Nb10O15 shell.
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Affiliation(s)
- Xin Lei
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
| | - Hanyu Zhang
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
| | - Yuhan Jia
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China. and University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhixun Luo
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China. and University of Chinese Academy of Sciences, Beijing 100049, China
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6
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Masubuchi T, Eckhard JF, Goddard G, Tschurl M, Heiz U. Thermal C–O coupling reactions of Ta methylene clusters [TanCH2]+ (n = 1, 4) with O2. Phys Chem Chem Phys 2019; 21:20743-20749. [DOI: 10.1039/c9cp02739d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Cationic tantalum carbenes [TaCH2]+ and [Ta4CH2]+, products of methane dehydrogenation, are reacted with dioxygen in an ion trap. Detected products suggest a formation of value-added molecules originating from C–O coupling reactions.
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Affiliation(s)
- T. Masubuchi
- Lehrstuhl für Physikalische Chemie, Chemistry Department & Catalysis Research Center, Technische Universität München, Lichtenbergstr. 4
- Garching
- Germany
| | - J. F. Eckhard
- Lehrstuhl für Physikalische Chemie, Chemistry Department & Catalysis Research Center, Technische Universität München, Lichtenbergstr. 4
- Garching
- Germany
| | - G. Goddard
- Lehrstuhl für Physikalische Chemie, Chemistry Department & Catalysis Research Center, Technische Universität München, Lichtenbergstr. 4
- Garching
- Germany
| | - M. Tschurl
- Lehrstuhl für Physikalische Chemie, Chemistry Department & Catalysis Research Center, Technische Universität München, Lichtenbergstr. 4
- Garching
- Germany
| | - U. Heiz
- Lehrstuhl für Physikalische Chemie, Chemistry Department & Catalysis Research Center, Technische Universität München, Lichtenbergstr. 4
- Garching
- Germany
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7
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Li X, Chen Y, Basnet P, Luo J, Wang H. Probing the properties of size dependence and correlation for tantalum clusters: geometry, stability, vibrational spectra, magnetism, and electronic structure. RSC Adv 2019; 9:1015-1028. [PMID: 35517637 PMCID: PMC9059546 DOI: 10.1039/c8ra09240k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Accepted: 12/20/2018] [Indexed: 11/30/2022] Open
Abstract
A comprehensive investigation on the equilibrium geometry, relative stability, vibrational spectra, and magnetic and electronic properties of neutral tantalum clusters (Tan, n = 2–17) was performed using density functional theory (DFT). We perform a study of the size dependence and correlations among those descriptors of parameters, and showed these could provide a novel way to confirm and predict experimental results. Some new isomer configurations that have never been reported before for tantalum clusters were found. The growth behaviors revealed that a compact geometrical growth route is preferred and develops a body-centered-cubic (BCC) structure with the cluster size increasing. The perfectly fitted functional curve, strong linear evolution, and obvious odd–even oscillation behavior proved their corresponding properties depended on the cluster size. Multiple demonstrations of the magic number were confirmed through the correlated relationships with the relative stability, including the second difference in energy, maximum hardness, and minimum polarizability. An inverse evolution trend between the energy gap and electric dipole moment and strong linear correlation between ionization potentials and polarizability indicated the strong correlation between the magnetic and electronic properties. Vibrational spectroscopy as a fingerprint was used to distinguish the ground state among the competitive geometrical isomers close in energy. The charge density difference isosurface, density of states, and molecular orbitals of selected representative clusters were analyzed to investigate the difference and evolutional trend of the relative stability and electronic structure. In addition, we first calculated the ionization potential and magnetic moment and compared these with the current available experimental data for tantalum clusters. A comprehensive investigation on the equilibrium geometry, relative stability, vibrational spectra, and magnetic and electronic properties of neutral tantalum clusters (Tan, n = 2–17) was performed using density functional theory (DFT).![]()
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Affiliation(s)
- Xibo Li
- Science and Technology on Plasma Physics Laboratory
- Laser Fusion Research Center
- China Academy of Engineering Physics
- Mianyang
- China
| | - Yuqi Chen
- School of Physical Science and Technology
- Southwest Jiaotong University
- Chengdu
- China
| | - Pradip Basnet
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | - Jiangshan Luo
- Science and Technology on Plasma Physics Laboratory
- Laser Fusion Research Center
- China Academy of Engineering Physics
- Mianyang
- China
| | - Hongyan Wang
- School of Physical Science and Technology
- Southwest Jiaotong University
- Chengdu
- China
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8
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Masubuchi T, Eckhard JF, Lange K, Visser B, Tschurl M, Heiz U. An efficient laser vaporization source for chemically modified metal clusters characterized by thermodynamics and kinetics. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:023104. [PMID: 29495846 DOI: 10.1063/1.5017588] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A laser vaporization cluster source that has a room for cluster aggregation and a reactor volume, each equipped with a pulsed valve, is presented for the efficient gas-phase production of chemically modified metal clusters. The performance of the cluster source is evaluated through the production of Ta and Ta oxide cluster cations, TaxOy+ (y ≥ 0). It is demonstrated that the cluster source produces TaxOy+ over a wide mass range, the metal-to-oxygen ratio of which can easily be controlled by changing the pulse duration that influences the amount of reactant O2 introduced into the cluster source. Reaction kinetic modeling shows that the generation of the oxides takes place under thermalized conditions at less than 300 K, whereas metal cluster cores are presumably created with excess heat. These characteristics are also advantageous to yield "reaction intermediates" of interest via reactions between clusters and reactive molecules in the cluster source, which may subsequently be mass selected for their reactivity measurements.
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Affiliation(s)
- Tsugunosuke Masubuchi
- Chair of Physical Chemistry, Catalysis Research Center, Department of Chemistry, Technische Universität München, Lichtenbergstraße 4, 85748 Garching, Germany
| | - Jan F Eckhard
- Chair of Physical Chemistry, Catalysis Research Center, Department of Chemistry, Technische Universität München, Lichtenbergstraße 4, 85748 Garching, Germany
| | - Kathrin Lange
- Chair of Physical Chemistry, Catalysis Research Center, Department of Chemistry, Technische Universität München, Lichtenbergstraße 4, 85748 Garching, Germany
| | - Bradley Visser
- Chair of Physical Chemistry, Catalysis Research Center, Department of Chemistry, Technische Universität München, Lichtenbergstraße 4, 85748 Garching, Germany
| | - Martin Tschurl
- Chair of Physical Chemistry, Catalysis Research Center, Department of Chemistry, Technische Universität München, Lichtenbergstraße 4, 85748 Garching, Germany
| | - Ulrich Heiz
- Chair of Physical Chemistry, Catalysis Research Center, Department of Chemistry, Technische Universität München, Lichtenbergstraße 4, 85748 Garching, Germany
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9
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Arakawa M, Ando K, Fujimoto S, Mishra S, Patwari GN, Terasaki A. The role of electronegativity on the extent of nitridation of group 5 metals as revealed by reactions of tantalum cluster cations with ammonia molecules. Phys Chem Chem Phys 2018; 20:13974-13982. [DOI: 10.1039/c8cp00424b] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The electronegativity of the metal (V > Ta) plays a key role in determining the composition of the metal nitrides.
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Affiliation(s)
- Masashi Arakawa
- Department of Chemistry
- Faculty of Science
- Kyushu University
- Fukuoka 819-0395
- Japan
| | - Kota Ando
- Department of Chemistry
- Faculty of Science
- Kyushu University
- Fukuoka 819-0395
- Japan
| | - Shuhei Fujimoto
- Department of Chemistry
- Faculty of Science
- Kyushu University
- Fukuoka 819-0395
- Japan
| | - Saurabh Mishra
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
| | - G. Naresh Patwari
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
| | - Akira Terasaki
- Department of Chemistry
- Faculty of Science
- Kyushu University
- Fukuoka 819-0395
- Japan
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10
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Eckhard JF, Neuwirth D, Tschurl M, Heiz U. From oxidative degradation to direct oxidation: size regimes in the consecutive reaction of cationic tantalum clusters with dioxygen. Phys Chem Chem Phys 2017; 19:10863-10869. [DOI: 10.1039/c7cp01293d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Cationic tantalum clusters (Ta9–12+) are reacted with molecular oxygen under multi-collision conditions in the gas phase in order to analyze the reaction kinetics.
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Affiliation(s)
- J. F. Eckhard
- Lehrstuhl für Physikalische Chemie
- Chemistry Department & Catalysis Research Center
- Technische Universität München
- 85748 Garching
- Germany
| | - D. Neuwirth
- Lehrstuhl für Physikalische Chemie
- Chemistry Department & Catalysis Research Center
- Technische Universität München
- 85748 Garching
- Germany
| | - M. Tschurl
- Lehrstuhl für Physikalische Chemie
- Chemistry Department & Catalysis Research Center
- Technische Universität München
- 85748 Garching
- Germany
| | - U. Heiz
- Lehrstuhl für Physikalische Chemie
- Chemistry Department & Catalysis Research Center
- Technische Universität München
- 85748 Garching
- Germany
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