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Jeon H, Kim YH, Kim H, Jeong H, Won BR, Jang W, Park CH, Lee KT, Myung JH. Optimizing Reversible Exsolution and Phase Transformation in Double Perovskite Sr 2Fe 1.5-xCo xMo 0.5O 6-δ Electrodes for High-Performance Symmetric Solid Oxide Cells. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2401628. [PMID: 39248663 DOI: 10.1002/smll.202401628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2024] [Revised: 08/13/2024] [Indexed: 09/10/2024]
Abstract
Double perovskite (DP) oxides are promising electrode materials for symmetric solid oxide cells (SSOCs) due to their excellent electrochemical activity and stability. B-site cation doping in DP oxides affects the reversibility of phase transformation and exsolution, which plays a crucial role in the catalyst recovery. Yet, few studies have been conducted on this topic. In this study, the Sr2Fe1.5-xCoxMo0.5O6-δ (CSFM, x = 0, 0.1, 0.3, 0.5) DP system demonstrates modulated exsolution and phase transformation reversibility by manipulating the oxygen vacancy concentration. The correlation between Co-doping level and oxygen vacancy concentration is investigated to optimize the exsolution and phase transformation properties. Sr2Fe1.2Co0.3Mo0.5O6-δ (3CSFM) exhibits reversible transformation between DP and Ruddlesden-Popper phases with a high density of exsolved CoFe nanoparticles under redox atmospheres. The quasi-symmetric cell with 3CSFM shows a peak power density of 1.27 W cm-2 at 850 °C in H2 fuel cell mode and a current density of 2.33 A cm-2 at 1.6 V and 800 °C in H2O electrolysis mode. The 3CSFM electrode exhibits robust stability during continuous operation for ≈700 h. These results demonstrate the significant role of B-site doping in designing DP materials capable of dynamic phase transformation in diverse environments.
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Affiliation(s)
- Hyejin Jeon
- Department of Materials Science and Engineering, Incheon National University, Incheon, 22012, Republic of Korea
| | - Yo Han Kim
- Department of Materials Science and Engineering, Incheon National University, Incheon, 22012, Republic of Korea
| | - Hyeonggeun Kim
- Department of Mechanical Engineering, KAIST, Daejeon, 34141, Republic of Korea
| | - Hyeongwon Jeong
- Department of Materials Science and Engineering, Incheon National University, Incheon, 22012, Republic of Korea
| | - Bo-Ram Won
- Department of Materials Science and Engineering, Incheon National University, Incheon, 22012, Republic of Korea
| | - Wonjun Jang
- Department of Materials Science and Engineering, Incheon National University, Incheon, 22012, Republic of Korea
| | - Chan-Ho Park
- Department of Materials Science and Engineering, Incheon National University, Incheon, 22012, Republic of Korea
| | - Kang Taek Lee
- Department of Mechanical Engineering, KAIST, Daejeon, 34141, Republic of Korea
- KAIST Graduate School of Green Growth & Sustainability, Daejeon, 34141, Republic of Korea
| | - Jae-Ha Myung
- Department of Materials Science and Engineering, Incheon National University, Incheon, 22012, Republic of Korea
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Guo J, Berenov A, Skinner SJ. In situ investigation of ruthenium doped lanthanum nickel titanium double perovskite and its exsolution behaviour. NANOSCALE ADVANCES 2024; 6:4394-4406. [PMID: 39170972 PMCID: PMC11334975 DOI: 10.1039/d4na00349g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/25/2024] [Accepted: 07/03/2024] [Indexed: 08/23/2024]
Abstract
Exsolution, an innovative method for fabricating perovskite-based oxides decorated with metal nanoparticles, has garnered significant interest in the fields of catalyst fabrication and electrochemical devices. Although dopant exsolution from single perovskite structures has been extensively studied, the exsolution behaviour of double perovskite structures remains insufficiently understood. In this study, we synthesized B-site double perovskite Ru-doped lanthanum nickel titanates with a 7.5 at% A-site deficiency, and systematically investigated the exsolution process that formed nickel metal nanoparticles on the material surface, across a broad reduction temperature range of 350-1000 °C. Both Ex situ and in situ characterization revealed that small, uniform Ni nanoparticles exsolved at low temperatures, whereas the exsolution of ruthenium required higher reduction temperatures beyond 1000 °C. Within the reduction temperature range of 350-500 °C, a notable finding is the reconstruction of exsolved nanoparticles, implying that Ni particles exist in a thermodynamically metastable state. Electrochemical impedance spectroscopy (EIS) showed a decreased area specific resistance (ASR) during the progress of exsolution. The increase in current density of a full solid oxide cell (SOC) in electrolysis mode and the doubling of peak power density in fuel cell mode attributed to the exsolution of Ni nanoparticles highlight the potential application of metal exsolution in electrode materials for SOCs.
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Affiliation(s)
- Jia Guo
- Department of Materials, Imperial College London Exhibition Road London SW7 2AZ UK
| | - Andrey Berenov
- Department of Materials, Imperial College London Exhibition Road London SW7 2AZ UK
| | - Stephen J Skinner
- Department of Materials, Imperial College London Exhibition Road London SW7 2AZ UK
- International Institute for Carbon Neutral Energy Research, Kyushu University Fukuoka Japan
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Hildebrand M, Holst D, Bender T, Kronik L. Electronic Structure, Bonding, and Stability of Boron Subphthalocyanine Halides and Pseudohalides. ADVANCED THEORY AND SIMULATIONS 2022. [DOI: 10.1002/adts.202100400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Mariana Hildebrand
- Department of Molecular Chemistry and Materials Science Weizmann Institute of Science Rehovoth 7610000 Israel
| | - Devon Holst
- Department of Chemistry University of Toronto 80 St. George Street Toronto Ontario M5S 3E4 Canada
| | - Timothy Bender
- Department of Chemistry University of Toronto 80 St. George Street Toronto Ontario M5S 3E4 Canada
- Department of Chemical Engineering and Applied Chemistry University of Toronto 200 College Street Toronto Ontario M5S 3E4 Canada
- Department of Materials Science and Engineering University of Toronto 184 College Street Toronto Ontario M5S 3E4 Canada
| | - Leeor Kronik
- Department of Molecular Chemistry and Materials Science Weizmann Institute of Science Rehovoth 7610000 Israel
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Xu R, Xuan F, Quek SY. Spin-Dependent Tunneling Barriers in CoPc/VSe 2 from Many-Body Interactions. J Phys Chem Lett 2020; 11:9358-9363. [PMID: 33091301 DOI: 10.1021/acs.jpclett.0c02944] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Mixed-dimensional magnetic heterostructures are intriguing, newly available platforms to explore quantum physics and its applications. Using state-of-the-art many-body perturbation theory, we predict the energy level alignment for a self-assembled monolayer of cobalt phthalocyanine (CoPc) molecules on magnetic VSe2 monolayers. The predicted projected density of states on CoPc agrees with experimental scanning tunneling spectra. Consistent with experiment, we predict a shoulder in the unoccupied region of the spectra that is absent from mean-field calculations. Unlike the nearly spin-degenerate gas-phase frontier molecular orbitals, the tunneling barriers at the interface are spin-dependent, a finding of interest for quantum information and spintronics applications. Both the experimentally observed shoulder and the predicted spin-dependent tunneling barriers originate from many-body interactions in the interface-hybridized states. Our results showcase the intricate many-body physics that governs the properties of these mixed-dimensional magnetic heterostructures and suggests the possibility of manipulating the spin-dependent tunneling barriers through modifications of interface coupling.
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Affiliation(s)
- Runrun Xu
- Department of Physics, National University of Singapore, 2 Science Drive 3, 117542 Singapore
| | - Fengyuan Xuan
- Centre for Advanced 2D Materials, National University of Singapore, 6 Science Drive 2, 117546 Singapore
| | - Su Ying Quek
- Department of Physics, National University of Singapore, 2 Science Drive 3, 117542 Singapore
- Centre for Advanced 2D Materials, National University of Singapore, 6 Science Drive 2, 117546 Singapore
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Degtyarev AA, Trishina AV, Dyachkova TP, Subocheva MY, Obraztsova EY. Predicting the Possibility of Oleophilizing Surfaces of Copper Phthalocianin on the Basis of Reactivity Descriptors. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2020. [DOI: 10.1134/s0036024420080051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Brumboiu IE, Haldar S, Lüder J, Eriksson O, Herper HC, Brena B, Sanyal B. Ligand Effects on the Linear Response Hubbard U: The Case of Transition Metal Phthalocyanines. J Phys Chem A 2019; 123:3214-3222. [DOI: 10.1021/acs.jpca.8b11940] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Iulia Emilia Brumboiu
- Department of Theoretical Chemistry and Biology, KTH Royal Institute of Technology, 10691 Stockholm, Sweden
- Department of Chemistry, Korea Advanced Institute of Science and Technology, 34141 Daejeon, Korea
| | - Soumyajyoti Haldar
- Institute of Theoretical Physics and Astrophysics, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - Johann Lüder
- Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, 80424 Kaohsiung, Taiwan
| | - Olle Eriksson
- Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, Sweden
| | - Heike C. Herper
- Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, Sweden
| | - Barbara Brena
- Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, Sweden
| | - Biplab Sanyal
- Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, Sweden
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Pham NNT, Park JS, Kim HT, Kim HJ, Son YA, Kang SG, Lee SG. Catalytic performance of graphene quantum dot supported manganese phthalocyanine for efficient oxygen reduction: density functional theory approach. NEW J CHEM 2019. [DOI: 10.1039/c8nj05093g] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The thermodynamic free-energy diagrams predict that MnPc/GQD is more active toward ORR than the isolated MnPc, clearly highlighting the effect of the GQD matrix on ORR activity from a thermodynamic perspective.
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Affiliation(s)
- Nguyet N. T. Pham
- Department of Organic Material Science and Engineering
- Pusan National University
- Busan
- Republic of Korea
| | - Jong S. Park
- Department of Organic Material Science and Engineering
- Pusan National University
- Busan
- Republic of Korea
| | - Hee-Tak Kim
- Department of Chemical and Biomolecular Engineering
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon 34141
- Republic of Korea
| | - Hyoung-Juhn Kim
- Fuel Cell Research Center
- Korea Institute of Science and Technology
- Seongbuk-gu
- Republic of Korea
| | - Young-A Son
- Department of Advanced Organic Materials Engineering
- Chungnam National University
- Daejeon 305-764
- Republic of Korea
| | - Sung Gu Kang
- School of Chemical Engineering
- University of Ulsan
- Ulsan 44610
- Republic of Korea
| | - Seung Geol Lee
- Department of Organic Material Science and Engineering
- Pusan National University
- Busan
- Republic of Korea
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8
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Pagenkopf F, Müller E, Knupfer M. Electronic excitations of manganese phthalocyanine molecules. J Chem Phys 2018; 148:044701. [DOI: 10.1063/1.5008916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
| | - Eric Müller
- IFW Dresden, Helmholtzstr. 20, D-01069 Dresden, Germany
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Rückerl F, Waas D, Büchner B, Knupfer M, Zahn DRT, Haidu F, Hahn T, Kortus J. Charge transfer from and to manganese phthalocyanine: bulk materials and interfaces. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2017; 8:1601-1615. [PMID: 28884064 PMCID: PMC5550819 DOI: 10.3762/bjnano.8.160] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Accepted: 06/13/2017] [Indexed: 05/09/2023]
Abstract
Manganese phthalocyanine (MnPc) is a member of the family of transition-metal phthalocyanines, which combines interesting electronic behavior in the fields of organic and molecular electronics with local magnetic moments. MnPc is characterized by hybrid states between the Mn 3d orbitals and the π orbitals of the ligand very close to the Fermi level. This causes particular physical properties, different from those of the other phthalocyanines, such as a rather small ionization potential, a small band gap and a large electron affinity. These can be exploited to prepare particular compounds and interfaces with appropriate partners, which are characterized by a charge transfer from or to MnPc. We summarize recent spectroscopic and theoretical results that have been achieved in this regard.
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Affiliation(s)
| | - Daniel Waas
- IFW Dresden, Helmholtzstr. 20, D-01069 Dresden, Germany
| | - Bernd Büchner
- IFW Dresden, Helmholtzstr. 20, D-01069 Dresden, Germany
| | | | - Dietrich R T Zahn
- Semiconductor Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany
| | - Francisc Haidu
- Semiconductor Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany
| | - Torsten Hahn
- Institute of Theoretical Physics, TU Bergakademie Freiberg, Leipziger Str. 23, D-09596 Freiberg, Germany
| | - Jens Kortus
- Institute of Theoretical Physics, TU Bergakademie Freiberg, Leipziger Str. 23, D-09596 Freiberg, Germany
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Néel N, Lattelais M, Bocquet ML, Kröger J. Depopulation of Single-Phthalocyanine Molecular Orbitals upon Pyrrolic-Hydrogen Abstraction on Graphene. ACS NANO 2016; 10:2010-6. [PMID: 26812093 DOI: 10.1021/acsnano.5b06153] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Single-molecule chemistry with a scanning tunneling microscope has preponderantly been performed on metal surfaces. The molecule-metal hybridization, however, is often detrimental to genuine molecular properties and obscures their changes upon chemical reactions. We used graphene on Ir(111) to reduce the coupling between Ir(111) and adsorbed phthalocyanine molecules. By local electron injection from the tip of a scanning tunneling microscope the two pyrrolic H atoms were removed from single phthalocyanines. The detachment of the H atom pair induced a strong modification of the molecular electronic structure, albeit with no change in the adsorption geometry. Spectra and maps of the differential conductance combined with density functional calculations unveiled the entire depopulation of the highest occupied molecular orbital upon H abstraction. Occupied π states of intact molecules are proposed to be emptied via intramolecular electron transfer to dangling σ states of H-free N atoms.
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Affiliation(s)
- Nicolas Néel
- Institut für Physik, Technische Universität Ilmenau , D-98693 Ilmenau, Germany
| | - Marie Lattelais
- Department of Chemistry, UMR ENS-CNRS-UPMC 8640, Ecole Normale Supérieure , F-75005 Paris, France
| | - Marie-Laure Bocquet
- Department of Chemistry, UMR ENS-CNRS-UPMC 8640, Ecole Normale Supérieure , F-75005 Paris, France
| | - Jörg Kröger
- Institut für Physik, Technische Universität Ilmenau , D-98693 Ilmenau, Germany
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11
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Altenburg SJ, Lattelais M, Wang B, Bocquet ML, Berndt R. Reaction of Phthalocyanines with Graphene on Ir(111). J Am Chem Soc 2015; 137:9452-8. [DOI: 10.1021/jacs.5b05558] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Simon J. Altenburg
- Institut
für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany
| | - Marie Lattelais
- Laboratoire
de Chimie, Ecole Normale Supérieure de Lyon, CNRS, Université de Lyon, F69007 Lyon, France
| | - Bin Wang
- School
of Chemical, Biological, and Materials Engineering, University of Oklahoma, 100 E. Boyd St., Norman, Oklahoma 73019-1004, United States
| | - Marie-Laure Bocquet
- Laboratoire
de Chimie, Ecole Normale Supérieure de Lyon, CNRS, Université de Lyon, F69007 Lyon, France
| | - Richard Berndt
- Institut
für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany
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12
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Gas-Phase Valence-Electron Photoemission Spectroscopy Using Density Functional Theory. Top Curr Chem (Cham) 2014; 347:137-91. [DOI: 10.1007/128_2013_522] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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13
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Huang YL, Wruss E, Egger DA, Kera S, Ueno N, Saidi WA, Bucko T, Wee ATS, Zojer E. Understanding the adsorption of CuPc and ZnPc on noble metal surfaces by combining quantum-mechanical modelling and photoelectron spectroscopy. Molecules 2014; 19:2969-92. [PMID: 24609018 PMCID: PMC6271497 DOI: 10.3390/molecules19032969] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Revised: 02/24/2014] [Accepted: 02/26/2014] [Indexed: 11/16/2022] Open
Abstract
Phthalocyanines are an important class of organic semiconductors and, thus, their interfaces with metals are both of fundamental and practical relevance. In the present contribution we provide a combined theoretical and experimental study, in which we show that state-of-the-art quantum-mechanical simulations are nowadays capable of treating most properties of such interfaces in a quantitatively reliable manner. This is shown for Cu-phthalocyanine (CuPc) and Zn-phthalocyanine (ZnPc) on Au(111) and Ag(111) surfaces. Using a recently developed approach for efficiently treating van der Waals (vdW) interactions at metal/organic interfaces, we calculate adsorption geometries in excellent agreement with experiments. With these geometries available, we are then able to accurately describe the interfacial electronic structure arising from molecular adsorption. We find that bonding is dominated by vdW forces for all studied interfaces. Concomitantly, charge rearrangements on Au(111) are exclusively due to Pauli pushback. On Ag(111), we additionally observe charge transfer from the metal to one of the spin-channels associated with the lowest unoccupied π-states of the molecules. Comparing the interfacial density of states with our ultraviolet photoelectron spectroscopy (UPS) experiments, we find that the use of a hybrid functionals is necessary to obtain the correct order of the electronic states.
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Affiliation(s)
- Yu Li Huang
- Department of Physics, National University of Singapore, 2 Science Drive 3, 117542, Singapore.
| | - Elisabeth Wruss
- Institute of Solid State Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria.
| | - David A Egger
- Institute of Solid State Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria.
| | - Satoshi Kera
- Graduate School of Advanced Integration Science, Chiba University, 1- 33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
| | - Nobuo Ueno
- Graduate School of Advanced Integration Science, Chiba University, 1- 33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
| | - Wissam A Saidi
- Department of Chemical and Petroleum Engineering, University of Pittsburgh, 1249 Benedum Hall, Pittsburgh, PA 15261, USA.
| | - Tomas Bucko
- Department of Physical and Theoretical Chemistry, Faculty of Natural Sciences, Comenius University, Mlynska Dolina, SK-84215 Bratislava, Slovakia.
| | - Andrew T S Wee
- Department of Physics, National University of Singapore, 2 Science Drive 3, 117542, Singapore.
| | - Egbert Zojer
- Institute of Solid State Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria.
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14
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Theoretical and computational chemistry in Spain. Theor Chem Acc 2011. [DOI: 10.1007/s00214-011-0895-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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