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Lobo-Checa J, Hernández-López L, Otrokov MM, Piquero-Zulaica I, Candia AE, Gargiani P, Serrate D, Delgado F, Valvidares M, Cerdá J, Arnau A, Bartolomé F. Ferromagnetism on an atom-thick & extended 2D metal-organic coordination network. Nat Commun 2024; 15:1858. [PMID: 38424075 PMCID: PMC10904770 DOI: 10.1038/s41467-024-46115-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Accepted: 02/14/2024] [Indexed: 03/02/2024] Open
Abstract
Ferromagnetism is the collective alignment of atomic spins that retain a net magnetic moment below the Curie temperature, even in the absence of external magnetic fields. Reducing this fundamental property into strictly two-dimensions was proposed in metal-organic coordination networks, but thus far has eluded experimental realization. In this work, we demonstrate that extended, cooperative ferromagnetism is feasible in an atomically thin two-dimensional metal-organic coordination network, despite only ≈ 5% of the monolayer being composed of Fe atoms. The resulting ferromagnetic state exhibits an out-of-plane easy-axis square-like hysteresis loop with large coercive fields over 2 Tesla, significant magnetic anisotropy, and persists up to TC ≈ 35 K. These properties are driven by exchange interactions mainly mediated by the molecular linkers. Our findings resolve a two decade search for ferromagnetism in two-dimensional metal-organic coordination networks.
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Affiliation(s)
- Jorge Lobo-Checa
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009, Zaragoza, Spain.
- Departamento de Física de la Materia Condensada, Universidad de Zaragoza, E-50009, Zaragoza, Spain.
| | - Leyre Hernández-López
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009, Zaragoza, Spain
- Departamento de Física de la Materia Condensada, Universidad de Zaragoza, E-50009, Zaragoza, Spain
| | - Mikhail M Otrokov
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, Manuel Lardizabal 5, E-20018, San Sebastián, Spain.
- Donostia International Physics Center, Paseo Manuel de Lardizabal 4, E-20018, San Sebastian, Spain.
- IKERBASQUE, Basque Foundation for Science, E-48011, Bilbao, Spain.
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza, 50009, Spain.
| | | | - Adriana E Candia
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009, Zaragoza, Spain
- Instituto de Desarrollo Tecnológico para la Industria Química (INTEC-UNL-CONICET), 3000, Santa Fe, Argentina
- Instituto de Física del Litoral, Universidad Nacional del Litoral (IFIS-UNL-CONICET), 3000, Santa Fe, Argentina
| | | | - David Serrate
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009, Zaragoza, Spain
- Departamento de Física de la Materia Condensada, Universidad de Zaragoza, E-50009, Zaragoza, Spain
| | - Fernando Delgado
- Instituto de Estudios Avanzados IUDEA, Departamento de Física, Universidad de La Laguna, C/Astrofísico Francisco Sánchez, s/n, 38203, La Laguna, Spain
| | - Manuel Valvidares
- ALBA Synchrotron Light Source, E-08290, Cerdanyola del Vallès, Spain
| | - Jorge Cerdá
- Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, 28049, Madrid, Spain
| | - Andrés Arnau
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, Manuel Lardizabal 5, E-20018, San Sebastián, Spain.
- Donostia International Physics Center, Paseo Manuel de Lardizabal 4, E-20018, San Sebastian, Spain.
- Departamento de Polímeros y Materiales Avanzados: Física, Química y Tecnología, Facultad de Química UPV/EHU, 20080, Donostia-San Sebastián, Spain.
| | - Fernando Bartolomé
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009, Zaragoza, Spain.
- Departamento de Física de la Materia Condensada, Universidad de Zaragoza, E-50009, Zaragoza, Spain.
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2
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Fleming C, Vu S, Brook DJR, Agrestini S, Pellegrin E, DaRos J. Metal-ligand interactions in a redox active ligand system. Electrochemistry and spectroscopy of [M(dipyvd) 2] n+ (M=Zn, Ni, n=0, 1, 2). Front Chem 2023; 11:1295289. [PMID: 38033468 PMCID: PMC10684738 DOI: 10.3389/fchem.2023.1295289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Accepted: 10/27/2023] [Indexed: 12/02/2023] Open
Abstract
Reaction of nickel and zinc triflates with the tridentate leucoverdazyl 1-isopropyl-3,5-di (2'-pyridyl)-6-oxo-2H-tetrazine (dipyvdH) and triethylamine resulted in the neutral coordination compounds M(dipyvd)2 (M = Ni,Zn). In acetonitrile, both compounds undergo two one electron oxidation processes, Zn (dipyvd)2 at -0.28 V and -0.12 V and Ni(dipyvd)2 at -0.32 V and -0.15 V vs ferrocene/ferricenium. Oxidations are ligand based resulting in an intermediate mixed valence species and a cationic bis(verdazyl) compound respectively. Oxidation of the ligand changes a localized, antiaromatic, non-planar 8π electron anion to a planar, delocalized 7π electron radical. The change in ligand structure results in an increase in the octahedral ligand field splitting from 10,500 cm-1 to ∼13,000 cm-1, suggesting an increase in the pi acceptor character of the ligand. In the mixed valence species, spectroscopic data suggests minimal interaction between ligands mediated by the metal center; i.e., these are class I-II systems in the Robin-Day classification.
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Affiliation(s)
- Connor Fleming
- Department of Chemistry, San Jose State University, San Jose, CA, United States
| | - Son Vu
- Department of Chemistry, San Jose State University, San Jose, CA, United States
| | - David J. R. Brook
- Department of Chemistry, San Jose State University, San Jose, CA, United States
| | - Stefano Agrestini
- ALBA Synchrotron Light Source, E-08290 Cerdanyola del Vallès, Barcelona, Spain
| | - Eric Pellegrin
- ALBA Synchrotron Light Source, E-08290 Cerdanyola del Vallès, Barcelona, Spain
| | - Jeffrey DaRos
- Department of Chemistry, San Jose State University, San Jose, CA, United States
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3
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Lee S, Zhai H, Chan GKL. An Ab Initio Correction Vector Restricted Active Space Approach to the L-Edge XAS and 2p3d RIXS Spectra of Transition Metal Complexes. J Chem Theory Comput 2023; 19:7753-7763. [PMID: 37853682 PMCID: PMC10653107 DOI: 10.1021/acs.jctc.3c00663] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Indexed: 10/20/2023]
Abstract
We describe an ab initio approach to simulate L-edge X-ray absorption (XAS) and 2p3d resonant inelastic X-ray scattering (RIXS) spectroscopies. We model the strongly correlated electronic structure within a restricted active space and employ a correction vector formulation instead of sum-over-state expressions for the spectra, thus eliminating the need to calculate a large number of intermediate and final electronic states. We present benchmark simulations of the XAS and RIXS spectra of the iron complexes [FeCl4]1-/2- and [Fe(SCH3)4]1-/2- and interpret the spectra by deconvolving the correction vectors. Our approach represents a step toward simulating the X-ray spectroscopies of larger metal cluster systems that play a pivotal role in biology.
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Affiliation(s)
- Seunghoon Lee
- Department
of Chemistry, Seoul National University, Seoul 151-747, South Korea
- Division
of Chemistry and Chemical Engineering, California
Institute of Technology, Pasadena, California 91125, United States
| | - Huanchen Zhai
- Division
of Chemistry and Chemical Engineering, California
Institute of Technology, Pasadena, California 91125, United States
| | - Garnet Kin-Lic Chan
- Division
of Chemistry and Chemical Engineering, California
Institute of Technology, Pasadena, California 91125, United States
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4
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da Silva Santos M, Stüker T, Flach M, Ablyasova OS, Timm M, von Issendorff B, Hirsch K, Zamudio‐Bayer V, Riedel S, Lau JT. The Highest Oxidation State of Rhodium: Rhodium(VII) in [RhO 3 ] . Angew Chem Int Ed Engl 2022; 61:e202207688. [PMID: 35818987 PMCID: PMC9544489 DOI: 10.1002/anie.202207688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Indexed: 11/23/2022]
Abstract
Although the highest possible oxidation states of all transition elements are rare, they are not only of fundamental interest but also relevant as potentially strong oxidizing agents. In general, the highest oxidation states are found in the electron-rich late transition elements of groups 7-9 of the periodic table. Rhodium is the first element of the 4d transition metal series for which the highest known oxidation state does not equal its group number of 9, but reaches only a significantly lower value of +6 in exceptional cases. Higher oxidation states of rhodium have remained elusive so far. In a combined mass spectrometry, X-ray absorption spectroscopy, and quantum-chemical study of gas-phaseR h O n + (n=1-4), we identifyR h O 3 + as the1 A 1 ' trioxidorhodium(VII) cation, the first chemical species to contain rhodium in the +7 oxidation state, which is the third-highest oxidation state experimentally verified among all elements in the periodic table.
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Affiliation(s)
- Mayara da Silva Santos
- Physikalisches InstitutAlbert-Ludwigs-Universität FreiburgHermann-Herder-Straße 379104FreiburgGermany
- Abteilung für Hochempfindliche RöntgenspektroskopieHelmholtz-Zentrum Berlin für Materialien und EnergieAlbert-Einstein-Straße 1512489BerlinGermany
| | - Tony Stüker
- Institut für Chemie und Biochemie–Anorganische ChemieFreie Universität BerlinFabeckstraße 34/3614195BerlinGermany
| | - Max Flach
- Physikalisches InstitutAlbert-Ludwigs-Universität FreiburgHermann-Herder-Straße 379104FreiburgGermany
- Abteilung für Hochempfindliche RöntgenspektroskopieHelmholtz-Zentrum Berlin für Materialien und EnergieAlbert-Einstein-Straße 1512489BerlinGermany
| | - Olesya S. Ablyasova
- Physikalisches InstitutAlbert-Ludwigs-Universität FreiburgHermann-Herder-Straße 379104FreiburgGermany
- Abteilung für Hochempfindliche RöntgenspektroskopieHelmholtz-Zentrum Berlin für Materialien und EnergieAlbert-Einstein-Straße 1512489BerlinGermany
| | - Martin Timm
- Abteilung für Hochempfindliche RöntgenspektroskopieHelmholtz-Zentrum Berlin für Materialien und EnergieAlbert-Einstein-Straße 1512489BerlinGermany
| | - Bernd von Issendorff
- Physikalisches InstitutAlbert-Ludwigs-Universität FreiburgHermann-Herder-Straße 379104FreiburgGermany
| | - Konstantin Hirsch
- Abteilung für Hochempfindliche RöntgenspektroskopieHelmholtz-Zentrum Berlin für Materialien und EnergieAlbert-Einstein-Straße 1512489BerlinGermany
| | - Vicente Zamudio‐Bayer
- Abteilung für Hochempfindliche RöntgenspektroskopieHelmholtz-Zentrum Berlin für Materialien und EnergieAlbert-Einstein-Straße 1512489BerlinGermany
| | - Sebastian Riedel
- Institut für Chemie und Biochemie–Anorganische ChemieFreie Universität BerlinFabeckstraße 34/3614195BerlinGermany
| | - J. Tobias Lau
- Physikalisches InstitutAlbert-Ludwigs-Universität FreiburgHermann-Herder-Straße 379104FreiburgGermany
- Abteilung für Hochempfindliche RöntgenspektroskopieHelmholtz-Zentrum Berlin für Materialien und EnergieAlbert-Einstein-Straße 1512489BerlinGermany
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5
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Douma DH, Poaty LT, Lamperti A, Kenmoe S, Raji AT, Debernardi A, M’Passi-Mabiala B. Theoretical investigations of oxygen vacancy effects in nickel-doped zirconia from ab initio XANES spectroscopy at the oxygen K-edge. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2022; 13:975-985. [PMID: 36161250 PMCID: PMC9490065 DOI: 10.3762/bjnano.13.85] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Accepted: 09/02/2022] [Indexed: 06/16/2023]
Abstract
In this study, we present theoretical X-ray absorption near-edge structure (XANES) spectra at the K-edge of oxygen in zirconia containing Ni dopant atoms and O vacancies at varying concentrations. Specifically, our model system consist of a supercell composed of a zirconia (ZrO2) matrix containing two nickel dopants (2Ni), which substitute two Zr atoms at a finite separation. We found the 2Ni atoms to be most stable in a ferromagnetic configuration in the absence of oxygen vacancies. In this system, each Ni atom is surrounded by two shells of O with tetrahedral geometry, in a similar way as in bulk cubic zirconia. The oxygen K-edge XANES spectrum of this configuration shows a pre-edge peak, which is attributable to dipole transitions from O 1s to O 2p states that are hybridized with unoccupied Ni 3d states. The intensity of this pre-edge peak, however, reduces upon the introduction of a single vacancy in the 2Ni-doped zirconia matrix. The corresponding ground state remains ferromagnetic, while one of the nickel atoms adopts a trigonal bipyramidal geometry, and the other one remains in a tetrahedral geometry. Furthermore, the introduction of two vacancies in the 2Ni-doped zirconia results in the two Ni atoms having distorted octahedral and trigonal bipyramidal geometries and being coupled antiferromagnetically in the ground state. Additionally, the oxygen K-edge XANES spectrum shows a further decrease in the intensity of the pre-edge peak, compared to the case of a single vacancy. Thus, the changes in the intensity of the pre-edge peak evidence a major structural change in the local environment around nickel atoms and, by extension, in the zirconia matrix. This change is due to the structural disorder induced by the 2Ni dopants and the O vacancies. Furthermore, the analysis of the XANES signatures shows that the oxidation state of nickel atoms changes with the introduction of oxygen vacancies. Our study therefore shows a possibility to control the oxidation state and magnetic order in a typical diluted magnetic oxide. Such a finding may be crucial for spintronics-related applications.
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Affiliation(s)
- Dick Hartmann Douma
- Groupe de Simulations Numériques en Magnétisme et Catalyse, Faculté des Sciences et Techniques, Université Marien Ngouabi, B.P. 69 Brazzaville, Congo
| | - Lodvert Tchibota Poaty
- Groupe de Simulations Numériques en Magnétisme et Catalyse, Faculté des Sciences et Techniques, Université Marien Ngouabi, B.P. 69 Brazzaville, Congo
| | - Alessio Lamperti
- IMM-CNR, Unit of Agrate Brianza, via C. Olivetti 2, 20864 Agrate Brianza (MB), Italy
| | - Stéphane Kenmoe
- Department of Theoretical Chemistry, University of Duisburg-Essen, Universitätstr. 2, D-45141 Essen, Germany
| | - Abdulrafiu Tunde Raji
- Department of Physics, College of Science, Engineering and Technology (CSET), University of South Africa (UNISA-Florida Campus), Corner of Christiaan de Wet Road & Pioneer Avenue, Florida 1709, South Africa
- National Institute of Theoretical and Computational Sciences (NITheCS), University of South Africa (UNISA), Preller St, Muckleneuk, Pretoria 0002, South Africa
| | - Alberto Debernardi
- IMM-CNR, Unit of Agrate Brianza, via C. Olivetti 2, 20864 Agrate Brianza (MB), Italy
| | - Bernard M’Passi-Mabiala
- Groupe de Simulations Numériques en Magnétisme et Catalyse, Faculté des Sciences et Techniques, Université Marien Ngouabi, B.P. 69 Brazzaville, Congo
- Unité de Recherche en Nanomatériaux et Nanotechnologies, Institut National de Recherche en Sciences Exactes et Naturelles (IRSEN), Brazzaville, Congo
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6
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Flach M, Hirsch K, Timm M, Ablyasova OS, da Silva Santos M, Kubin M, Bülow C, Gitzinger T, von Issendorff B, Lau JT, Zamudio-Bayer V. Iron L 3-edge energy shifts for the full range of possible 3d occupations within the same oxidation state of iron halides. Phys Chem Chem Phys 2022; 24:19890-19894. [PMID: 35959850 DOI: 10.1039/d2cp02448a] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Oxidation states are integer in number but dn configurations of transition metal centers vary continuously in polar bonds. We quantify the shifts of the iron L3 excitation energy, within the same formal oxidation state, in a systematic L-edge X-ray absorption spectroscopy study of diatomic gas-phase iron(II) halide cations, [FeX]+,where X = F, Cl, Br, I. These shifts correlate with the electronegativity of the halogen, and are attributed exclusively to a fractional increase in population of 3d-derived orbitals along the series as supported by charge transfer multiplet simulations and density functional theory calculations. We extract an excitation energy shift of 420 meV ± 60 meV spanning the full range of possible 3d occupations between the most ionic bond in [FeF]+ and covalently bonded [FeI]+.
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Affiliation(s)
- Max Flach
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany. .,Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - Konstantin Hirsch
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany.
| | - Martin Timm
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany.
| | - Olesya S Ablyasova
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany. .,Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - Mayara da Silva Santos
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany. .,Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - Markus Kubin
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany.
| | - Christine Bülow
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany. .,Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - Tim Gitzinger
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany. .,Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - Bernd von Issendorff
- Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - J Tobias Lau
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany. .,Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - Vicente Zamudio-Bayer
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany.
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7
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da Silva Santos M, Stüker T, Flach M, Ablyasova OS, Timm M, von Issendorff B, Hirsch K, Zamudio-Bayer V, Riedel S, Lau JT. The Highest Oxidation State of Rhodium: Rhodium(VII) in [RhO3]+. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202207688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Mayara da Silva Santos
- Helmholtz-Zentrum Berlin für Materialien und Energie Physics Albert-Eistein-Str. 15 12489 Berlin GERMANY
| | - Tony Stüker
- Freie Universitat Berlin Institut für Chemie und Biochemie – Anorganische Chemie Fabeckstraße 34/36 14195 Berlin GERMANY
| | - Max Flach
- Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH Abteilung für Hochempfindliche Röntgenspektroskopie Albert-Einstein-Straße 15 12489 Berlin GERMANY
| | - Olesya S. Ablyasova
- Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH Abteilung für Hochempfindliche Röntgenspektroskopie Albert-Einstein-Straße 15 12489 Berlin GERMANY
| | - Martin Timm
- Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH Abteilung für Hochempfindliche Röntgenspektroskopie Albert-Einstein-Straße 15 12489 Berlin GERMANY
| | - Bernd von Issendorff
- Albert-Ludwigs-Universitat Freiburg Physikalisches Institut Hermann-Herder-Straße 3 79104 Freiburg GERMANY
| | - Konstantin Hirsch
- Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH Abteilung für Hochempfindliche Röntgenspektroskopie Albert-Einstein-Straße 15 12489 Berlin GERMANY
| | - Vicente Zamudio-Bayer
- Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH Abteilung für Hochempfindliche Röntgenspektroskopie 12489 Berlin GERMANY
| | - Sebastian Riedel
- Freie Universitat Berlin Institut für Chemie und Biochemie – Anorganische Chemie Fabeckstraße 34/36 14195 Berlin GERMANY
| | - J. Tobias Lau
- Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH Abteilung für Hochempfindliche Röntgenspektroskopie Albert-Einstein-Straße 15 12489 Berlin GERMANY
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8
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Li Z, Ma R, Ju Q, Liu Q, Liu L, Zhu Y, Yang M, Wang J. Spin engineering of single-site metal catalysts. Innovation (N Y) 2022; 3:100268. [PMID: 35789959 PMCID: PMC9249949 DOI: 10.1016/j.xinn.2022.100268] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 06/06/2022] [Accepted: 06/06/2022] [Indexed: 11/28/2022] Open
Abstract
Single-site metal atoms (SMAs) on supports are attracting extensive interest as new catalytic systems because of maximized atom utilization and superior performance. However, rational design of configuration-optimized SMAs with high activity from the perspectives of fundamental electron spin is highly challenging. Herein, N-coordinated Fe single atoms are successfully distributed over axial carbon micropores to form dangling-FeN4 centers (d-FeN4). This unique d-FeN4 demonstrates much higher intrinsic activity toward oxygen reduction reaction (ORR) in HClO4 than FeN4 without micropore underneath and commercial Pt/C. Both theoretical calculation and electronic structure characterization imply that d-FeN4 endows central Fe with medium spin (t2g4 eg1), which provides a spin channel for electron transition compared with FeN4 with low spin. This leads to the facile formation of the singlet state of oxygen-containing species from triplet oxygen during the ORR, thus showing faster kinetics than FeN4. This work provides an in-depth understanding of spin tuning on SMAs for advanced energy catalysis. Single-site FeN4 species are designed to dangle over axial carbon micropores (d-FeN4) d-FeN4 shows much superior oxygen reduction reactivity to traditional FeN4 d-FeN4 facilitates the formation of singlet-state oxygen-containing species with optimized spin states by micropore This work provides in-depth understanding of spin tuning for advanced catalyst design
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Affiliation(s)
- Zichuang Li
- State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ruguang Ma
- State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China
- School of Materials Science and Engineering, Suzhou University of Science and Technology, 99 Xuefu Road, Suzhou 215009, China
- Corresponding author
| | - Qiangjian Ju
- State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qian Liu
- State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lijia Liu
- Department of Chemistry, Western University, 1151 Richmond Street, London, ON N6A 5B7, Canada
| | - Yufang Zhu
- State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Minghui Yang
- Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo 315201, China
| | - Jiacheng Wang
- State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
- Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials, College of Materials Science and Engineering, North China University of Science and Technology, Tangshan 063210, China
- Corresponding author
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9
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Mayer M, Vankova N, Stolz F, Abel B, Heine T, Asmis KR. Identification of a Two‐Coordinate Iron(I)–Oxalate Complex. Angew Chem Int Ed Engl 2022; 61:e202117855. [PMID: 35088489 PMCID: PMC9303725 DOI: 10.1002/anie.202117855] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Indexed: 12/16/2022]
Abstract
Exotic oxidation states of the first‐row transition metals have recently attracted much interest. In order to investigate the oxidation states of a series of iron–oxalate complexes, an aqueous solution of iron(III) nitrate and oxalic acid was studied by infrared free liquid matrix‐assisted laser desorption/ionization as well as ionspray mass spectrometry. Here, we show that iron is not only detected in its common oxidation states +II and +III, but also in its unusual oxidation state +I, detectable in both positive‐ion and in negative‐ion modes, respectively. Vibrational spectra of the gas phase anionic iron oxalate complexes [FeIII(C2O4)2]−, [FeII(C2O4)CO2]−, and [FeI(C2O4)]− were measured by means of infrared photodissociation spectroscopy and their structures were assigned by comparison to anharmonic vibrational spectra based on second‐order perturbation theory.
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Affiliation(s)
- Martin Mayer
- Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie Universität Leipzig Linnéstr. 2 04103 Leipzig Germany
| | - Nina Vankova
- Theoretische Chemie Technische Universität Dresden Bergstr. 66c 01062 Dresden Germany
| | - Ferdinand Stolz
- Leibniz Institute for Surface Engineering (IOM) Permoserstr. 15 04318 Leipzig Germany
| | - Bernd Abel
- Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie Universität Leipzig Linnéstr. 2 04103 Leipzig Germany
- Leibniz Institute for Surface Engineering (IOM) Permoserstr. 15 04318 Leipzig Germany
| | - Thomas Heine
- Theoretische Chemie Technische Universität Dresden Bergstr. 66c 01062 Dresden Germany
- Helmholtz-Zentrum Dresden-Rossendorf Forschungsstelle Leipzig Permoserstr. 15 04318 Leipzig Germany
- Department of Chemistry Yonsei University Seodaemun-gu, Seoul 120-749 Republic of Korea
| | - Knut R. Asmis
- Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie Universität Leipzig Linnéstr. 2 04103 Leipzig Germany
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10
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Kenmoe S, Douma DH, Raji AT, M’Passi-Mabiala B, Götsch T, Girgsdies F, Knop-Gericke A, Schlögl R, Spohr E. X-ray Absorption Near-Edge Structure (XANES) at the O K-Edge of Bulk Co3O4: Experimental and Theoretical Studies. NANOMATERIALS 2022; 12:nano12060921. [PMID: 35335734 PMCID: PMC8949186 DOI: 10.3390/nano12060921] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Revised: 03/06/2022] [Accepted: 03/08/2022] [Indexed: 01/05/2023]
Abstract
We combine theoretical and experimental X-ray absorption near-edge spectroscopy (XANES) to probe the local environment around cationic sites of bulk spinel cobalt tetraoxide (Co3O4). Specifically, we analyse the oxygen K-edge spectrum. We find an excellent agreement between our calculated spectra based on the density functional theory and the projector augmented wave method, previous calculations as well as with the experiment. The oxygen K-edge spectrum shows a strong pre-edge peak which can be ascribed to dipole transitions from O 1s to O 2p states hybridized with the unoccupied 3d states of cobalt atoms. Also, since Co3O4 contains two types of Co atoms, i.e., Co3+ and Co2+, we find that contribution of Co2+ ions to the pre-edge peak is solely due to single spin-polarized t2g orbitals (dxz, dyz, and dxy) while that of Co3+ ions is due to spin-up and spin-down polarized eg orbitals (dx2−y2 and dz2). Furthermore, we deduce the magnetic moments on the Co3+ and Co2+ to be zero and 3.00 μB respectively. This is consistent with an earlier experimental study which found that the magnetic structure of Co3O4 consists of antiferromagnetically ordered Co2+ spins, each of which is surrounded by four nearest neighbours of oppositely directed spins.
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Affiliation(s)
- Stephane Kenmoe
- Department of Chemistry, University of Duisburg-Essen, Universitätsstr. 2, 45141 Essen, Germany;
- Correspondence:
| | - Dick Hartmann Douma
- Groupe de Simulations Numériques en Magnétisme et Catalyse, Faculté des Sciences et Techniques, Université Marien Ngouabi, Brazzaville B.P. 69, Congo; (D.H.D.); (B.M.-M.)
| | - Abdulrafiu Tunde Raji
- Department of Physics, College of Science, Engineering and Technology (CSET), University of South Africa (UNISA), Corner of Christiaan de Wet Road & Pioneer Avenue, Florida 1709, South Africa;
- National Institute of Theoretical and Computational Sciences (NITheCS), University of South Africa (UNISA), Preller St., Muckleneuk, Pretoria 0002, South Africa
| | - Bernard M’Passi-Mabiala
- Groupe de Simulations Numériques en Magnétisme et Catalyse, Faculté des Sciences et Techniques, Université Marien Ngouabi, Brazzaville B.P. 69, Congo; (D.H.D.); (B.M.-M.)
- Unité de Recherche en Matériaux et Energies, Institut National de Recherche en Sciences Exactes et Naturelles, Brazzaville B.P. 2400, Congo
| | - Thomas Götsch
- Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany; (T.G.); (F.G.); (A.K.-G.); (R.S.)
| | - Frank Girgsdies
- Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany; (T.G.); (F.G.); (A.K.-G.); (R.S.)
| | - Axel Knop-Gericke
- Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany; (T.G.); (F.G.); (A.K.-G.); (R.S.)
- Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Robert Schlögl
- Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany; (T.G.); (F.G.); (A.K.-G.); (R.S.)
- Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Eckhard Spohr
- Department of Chemistry, University of Duisburg-Essen, Universitätsstr. 2, 45141 Essen, Germany;
- Center of Computational Sciences and Simulation, University of Duisburg-Essen, 45141 Essen, Germany
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11
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Mayer M, Vankova N, Stolz F, Abel B, Heine T, Asmis KR. Identification of a Two‐Coordinate Iron(I)‐Oxalate Complex. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202117855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Martin Mayer
- Universität Leipzig: Universitat Leipzig Wilhelm-Ostwald-Institut GERMANY
| | - Nina Vankova
- Technische Universität Dresden: Technische Universitat Dresden Theoretische Chemie GERMANY
| | - Ferdinand Stolz
- Leibniz Institute for Surface Modification: Leibniz-Institut fur Oberflachenmodifizierung eV Chemistry GERMANY
| | - Bernd Abel
- Leibniz Institute for Surface Modification: Leibniz-Institut fur Oberflachenmodifizierung eV Chemistry GERMANY
| | - Thomas Heine
- TU Dresden: Technische Universitat Dresden Theoretische Chemie GERMANY
| | - Knut R Asmis
- Universitat Leipzig Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie Linnéstr. 2 04103 Leipzig GERMANY
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12
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Delcey MG, Lindblad R, Timm M, Bülow C, Zamudio-Bayer V, von Issendorff B, Lau JT, Lundberg M. Soft x-ray signatures of ionic manganese-oxo systems, including a high-spin manganese(V) complex. Phys Chem Chem Phys 2022; 24:3598-3610. [DOI: 10.1039/d1cp03667j] [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
Manganese-oxo species catalyze key reactions, including C–H bond activation or dioxygen formation in natural photosynthesis. To better understand relevant reaction intermediates, we characterize electronic states and geometric structures of [MnOn]+...
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13
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Jenkins AJ, Hu H, Lu L, Frisch MJ, Li X. Two-Component Multireference Restricted Active Space Configuration Interaction for the Computation of L-Edge X-ray Absorption Spectra. J Chem Theory Comput 2021; 18:141-150. [PMID: 34908414 DOI: 10.1021/acs.jctc.1c00564] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
X-ray absorption spectroscopy is a powerful probe of local electronic and nuclear structures, providing insights into chemical processes. The theoretical prediction and interpretation of metal L-edge X-ray absorption spectra are complicated by both relativistic effects, including spin-orbit coupling and the multiconfigurational nature of the states involved. This work details an exact two-component multireference restricted active space (RAS) configuration interaction scheme that uses an exact two-component state-averaged complete active space self-consistent-field method, which includes the spin-orbit coupling in a variational manner, for the accurate description of the electronic structure before using a RAS configuration interaction method to describe the core excited states of the X-ray spectrum. Benchmark calculations are presented for a series of iron-containing complexes, with results showing key features of the spectrum being reproduced, including ligand-to-metal charge transfer and shake-up excitations.
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Affiliation(s)
- Andrew J Jenkins
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
| | - Hang Hu
- Molecular Engineering and Sciences Institute, University of Washington, Seattle, Washington 98195, United States
| | - Lixin Lu
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
| | - Michael J Frisch
- Gaussian Inc., 340 Quinnipiac Street, Building 40, Wallingford, Connecticut 06492, United States
| | - Xiaosong Li
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
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14
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Wang CH, DeBeer S. Structure, reactivity, and spectroscopy of nitrogenase-related synthetic and biological clusters. Chem Soc Rev 2021; 50:8743-8761. [PMID: 34159992 DOI: 10.1039/d1cs00381j] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The reduction of dinitrogen (N2) is essential for its incorporation into nucleic acids and amino acids, which are vital to life on earth. Nitrogenases convert atmospheric dinitrogen to two ammonia molecules (NH3) under ambient conditions. The catalytic active sites of these enzymes (known as FeM-cofactor clusters, where M = Mo, V, Fe) are the sites of N2 binding and activation and have been a source of great interest for chemists for decades. In this review, recent studies on nitrogenase-related synthetic molecular complexes and biological clusters are discussed, with a focus on their reactivity and spectroscopic characterization. The molecular models that are discussed span from simple mononuclear iron complexes to multinuclear iron complexes and heterometallic iron complexes. In addition, recent work on the extracted biological cofactors is discussed. An emphasis is placed on how these studies have contributed towards our understanding of the electronic structure and mechanism of nitrogenases.
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Affiliation(s)
- Chen-Hao Wang
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany.
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany.
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15
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Karuppannan SK, Martín-Rodríguez A, Ruiz E, Harding P, Harding DJ, Yu X, Tadich A, Cowie B, Qi D, Nijhuis CA. Room temperature conductance switching in a molecular iron(iii) spin crossover junction. Chem Sci 2020; 12:2381-2388. [PMID: 34164002 PMCID: PMC8179334 DOI: 10.1039/d0sc04555a] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Herein, we report the first room temperature switchable Fe(iii) molecular spin crossover (SCO) tunnel junction. The junction is constructed from [FeIII(qsal-I)2]NTf2 (qsal-I = 4-iodo-2-[(8-quinolylimino)methyl]phenolate) molecules self-assembled on graphene surfaces with conductance switching of one order of magnitude associated with the high and low spin states of the SCO complex. Normalized conductance analysis of the current–voltage characteristics as a function of temperature reveals that charge transport across the SCO molecule is dominated by coherent tunnelling. Temperature-dependent X-ray absorption spectroscopy and density functional theory confirm the SCO complex retains its SCO functionality on the surface implying that van der Waals molecule—electrode interfaces provide a good trade-off between junction stability while retaining SCO switching capability. These results provide new insights and may aid in the design of other types of molecular devices based on SCO compounds. Herein, we report the first room temperature switchable Fe(iii) molecular spin crossover (SCO) tunnel junction.![]()
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Affiliation(s)
- Senthil Kumar Karuppannan
- Department of Chemistry, National University of Singapore 3 Science Drive Singapore 117543 Singapore
| | - Alejandro Martín-Rodríguez
- Departament de Química Inorgànica, Institut de Recerca de Química Teòrica i Computacional, Universitat de Barcelona Diagonal 645 08028 Barcelona Spain
| | - Eliseo Ruiz
- Departament de Química Inorgànica, Institut de Recerca de Química Teòrica i Computacional, Universitat de Barcelona Diagonal 645 08028 Barcelona Spain
| | - Phimphaka Harding
- Functional Materials and Nanotechnology Center of Excellence, Walailak University Thasala Nakhon Si Thammarat 80160 Thailand
| | - David J Harding
- Functional Materials and Nanotechnology Center of Excellence, Walailak University Thasala Nakhon Si Thammarat 80160 Thailand
| | - Xiaojiang Yu
- Singapore Synchrotron Light Source, National University of Singapore 5 Research Link Singapore 117603 Singapore
| | - Anton Tadich
- Australian Synchrotron Clayton Victoria 3168 Australia
| | - Bruce Cowie
- School of Chemistry and Physics, Queensland University of Technology Brisbane Queensland 4001 Australia
| | - Dongchen Qi
- School of Chemistry and Physics, Queensland University of Technology Brisbane Queensland 4001 Australia
| | - Christian A Nijhuis
- Department of Chemistry, National University of Singapore 3 Science Drive Singapore 117543 Singapore .,Centre for Advanced 2D Materials & Graphene Research, National University of Singapore 6 Science Drive 2 Singapore 117546 Singapore
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16
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Källman E, Delcey MG, Guo M, Lindh R, Lundberg M. Quantifying similarity for spectra with a large number of overlapping transitions: Examples from soft X-ray spectroscopy. Chem Phys 2020. [DOI: 10.1016/j.chemphys.2020.110786] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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17
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Maganas D, Kowalska JK, Van Stappen C, DeBeer S, Neese F. Mechanism of L 2,3-edge x-ray magnetic circular dichroism intensity from quantum chemical calculations and experiment-A case study on V (IV)/V (III) complexes. J Chem Phys 2020; 152:114107. [PMID: 32199419 DOI: 10.1063/1.5129029] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
In this work, we present a combined experimental and theoretical study on the V L2,3-edge x-ray absorption (XAS) and x-ray magnetic circular dichroism (XMCD) spectra of VIVO(acac)2 and VIII(acac)3 prototype complexes. The recorded V L2,3-edge XAS and XMCD spectra are richly featured in both V L3 and L2 spectral regions. In an effort to predict and interpret the nature of the experimentally observed spectral features, a first-principles approach for the simultaneous prediction of XAS and XMCD spectra in the framework of wavefunction based ab initio methods is presented. The theory used here has previously been formulated for predicting optical absorption and MCD spectra. In the present context, it is applied to the prediction of the V L2,3-edge XAS and XMCD spectra of the VIVO(acac)2 and VIII(acac)3 complexes. In this approach, the spin-free Hamiltonian is computed on the basis of the complete active space configuration interaction (CASCI) in conjunction with second order N-electron valence state perturbation theory (NEVPT2) as well as the density functional theory (DFT)/restricted open configuration interaction with singles configuration state functions based on a ground state Kohn-Sham determinant (ROCIS/DFT). Quasi-degenerate perturbation theory is then used to treat the spin-orbit coupling (SOC) operator variationally at the many particle level. The XAS and XMCD transitions are computed between the relativistic many particle states, considering their respective Boltzmann populations. These states are obtained from the diagonalization of the SOC operator along with the spin and orbital Zeeman operators. Upon averaging over all possible magnetic field orientations, the XAS and XMCD spectra of randomly oriented samples are obtained. This approach does not rely on the validity of low-order perturbation theory and provides simultaneous access to the calculation of XMCD A, B, and C terms. The ability of the method to predict the XMCD C-term signs and provide access to the XMCD intensity mechanism is demonstrated on the basis of a generalized state coupling mechanism based on the type of the excitations dominating the relativistically corrected states. In the second step, the performance of CASCI, CASCI/NEVPT2, and ROCIS/DFT is evaluated. The very good agreement between theory and experiment has allowed us to unravel the complicated XMCD C-term mechanism on the basis of the SOC interaction between the various multiplets with spin S' = S, S ± 1. In the last step, it is shown that the commonly used spin and orbital sum rules are inadequate in interpreting the intensity mechanism of the XAS and XMCD spectra of the VIVO(acac)2 and VIII(acac)3 complexes as they breakdown when they are employed to predict their magneto-optical properties. This conclusion is expected to hold more generally.
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Affiliation(s)
- Dimitrios Maganas
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Joanna K Kowalska
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Casey Van Stappen
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Frank Neese
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
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18
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Baker ML, Wu SQ, Kang S, Matsuzawa S, Arrio MA, Narumi Y, Kihara T, Nakamura T, Kotani Y, Sato O, Nojiri H. Electron-Transfer Activity in a Cyanide-Bridged Fe42 Nanomagnet. Inorg Chem 2019; 58:10160-10166. [DOI: 10.1021/acs.inorgchem.9b01216] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michael L. Baker
- The School of Chemistry, The University of Manchester at Harwell, Didcot OX11 OFA, U.K
- The School of Chemistry, The University of Manchester, Manchester M139PL, U.K
| | - Shu-Qi Wu
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Soonchul Kang
- Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8527, Japan
| | - Satoshi Matsuzawa
- Institute for Materials Research, Tohoku University, Katahira, Sendai 980-8577, Japan
| | - Marie-Anne Arrio
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, CNRS, Sorbonne Université, IRD, MNHN, UMR7590, 75252 Paris Cedex 05, France
| | - Yasuo Narumi
- Center of Advanced High Magnetic Field Science, Osaka University, Toyonaka 1-1, Osaka 560-0043, Japan
| | - Takumi Kihara
- Institute for Materials Research, Tohoku University, Katahira, Sendai 980-8577, Japan
| | - Tetsuya Nakamura
- Japan Synchrotron Radiation Research Institute (JASRI), Sayo, Hyogo 679-5198, Japan
| | - Yoshinori Kotani
- Japan Synchrotron Radiation Research Institute (JASRI), Sayo, Hyogo 679-5198, Japan
| | - Osamu Sato
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Hiroyuki Nojiri
- Institute for Materials Research, Tohoku University, Katahira, Sendai 980-8577, Japan
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19
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Kowalska JK, Henthorn JT, Van Stappen C, Trncik C, Einsle O, Keavney D, DeBeer S. X-ray Magnetic Circular Dichroism Spectroscopy Applied to Nitrogenase and Related Models: Experimental Evidence for a Spin-Coupled Molybdenum(III) Center. Angew Chem Int Ed Engl 2019; 58:9373-9377. [PMID: 31119827 PMCID: PMC6772009 DOI: 10.1002/anie.201901899] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 04/17/2019] [Indexed: 11/23/2022]
Abstract
Nitrogenase enzymes catalyze the reduction of atmospheric dinitrogen to ammonia utilizing a Mo‐7Fe‐9S‐C active site, the so‐called FeMoco cluster. FeMoco and an analogous small‐molecule (Et4N)[(Tp)MoFe3S4Cl3] cubane have both been proposed to contain unusual spin‐coupled MoIII sites with an S(Mo)=1/2 non‐Hund configuration at the Mo atom. Herein, we present Fe and Mo L3‐edge X‐ray magnetic circular dichroism (XMCD) spectroscopy of the (Et4N)[(Tp)MoFe3S4Cl3] cubane and Fe L2,3‐edge XMCD spectroscopy of the MoFe protein (containing both FeMoco and the 8Fe‐7S P‐cluster active sites). As the P‐clusters of MoFe protein have an S=0 total spin, these are effectively XMCD‐silent at low temperature and high magnetic field, allowing for FeMoco to be selectively probed by Fe L2,3‐edge XMCD within the intact MoFe protein. Further, Mo L3‐edge XMCD spectroscopy of the cubane model has provided experimental support for a local S(Mo)=1/2 configuration, demonstrating the power and selectivity of XMCD.
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Affiliation(s)
- Joanna K Kowalska
- Inorganic Spectroscopy, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470, Mülheim an der Ruhr, Germany
| | - Justin T Henthorn
- Inorganic Spectroscopy, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470, Mülheim an der Ruhr, Germany
| | - Casey Van Stappen
- Inorganic Spectroscopy, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470, Mülheim an der Ruhr, Germany
| | - Christian Trncik
- Institute for Biochemistry and BIOSS Centre for Biological Signalling Studies, Albert Ludwigs University of Freiburg, Albertstrasse 21, 79104, Freiburg, Germany
| | - Oliver Einsle
- Institute for Biochemistry and BIOSS Centre for Biological Signalling Studies, Albert Ludwigs University of Freiburg, Albertstrasse 21, 79104, Freiburg, Germany
| | - David Keavney
- Argonne National Laboratory, 9700 S. Cass Ave, Argonne, IL, 60439, USA
| | - Serena DeBeer
- Inorganic Spectroscopy, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470, Mülheim an der Ruhr, Germany
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20
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Kowalska JK, Henthorn JT, Van Stappen C, Trncik C, Einsle O, Keavney D, DeBeer S. X‐ray Magnetic Circular Dichroism Spectroscopy Applied to Nitrogenase and Related Models: Experimental Evidence for a Spin‐Coupled Molybdenum(III) Center. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201901899] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Joanna K. Kowalska
- Inorganic Spectroscopy Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
| | - Justin T. Henthorn
- Inorganic Spectroscopy Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
| | - Casey Van Stappen
- Inorganic Spectroscopy Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
| | - Christian Trncik
- Institute for Biochemistry and BIOSS Centre for Biological Signalling Studies Albert Ludwigs University of Freiburg Albertstrasse 21 79104 Freiburg Germany
| | - Oliver Einsle
- Institute for Biochemistry and BIOSS Centre for Biological Signalling Studies Albert Ludwigs University of Freiburg Albertstrasse 21 79104 Freiburg Germany
| | - David Keavney
- Argonne National Laboratory 9700 S. Cass Ave Argonne IL 60439 USA
| | - Serena DeBeer
- Inorganic Spectroscopy Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
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21
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Guo M, Källman E, Pinjari RV, Couto RC, Kragh Sørensen L, Lindh R, Pierloot K, Lundberg M. Fingerprinting Electronic Structure of Heme Iron by Ab Initio Modeling of Metal L-Edge X-ray Absorption Spectra. J Chem Theory Comput 2018; 15:477-489. [DOI: 10.1021/acs.jctc.8b00658] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Meiyuan Guo
- Department of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
- Department of Chemistry - Ångström Laboratory, Uppsala University, 751 20 Uppsala, Sweden
| | - Erik Källman
- Department of Chemistry - Ångström Laboratory, Uppsala University, 751 20 Uppsala, Sweden
| | - Rahul V. Pinjari
- School of Chemical Sciences, Swami Ramanand Teerth Marathwada University, Nanded 431606, Maharashtra, India
| | - Rafael C. Couto
- Department of Chemistry - Ångström Laboratory, Uppsala University, 751 20 Uppsala, Sweden
| | - Lasse Kragh Sørensen
- Department of Chemistry - Ångström Laboratory, Uppsala University, 751 20 Uppsala, Sweden
| | - Roland Lindh
- Department of Chemistry - Ångström Laboratory, Uppsala University, 751 20 Uppsala, Sweden
| | - Kristine Pierloot
- Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Heverlee Leuven, Belgium
| | - Marcus Lundberg
- Department of Chemistry - Ångström Laboratory, Uppsala University, 751 20 Uppsala, Sweden
- Department of Biotechnology, Chemistry and Pharmacy, Università di Siena, Via A. Moro 2, 53100 Siena, Italy
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22
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Kubin M, Guo M, Kroll T, Löchel H, Källman E, Baker ML, Mitzner R, Gul S, Kern J, Föhlisch A, Erko A, Bergmann U, Yachandra V, Yano J, Lundberg M, Wernet P. Probing the oxidation state of transition metal complexes: a case study on how charge and spin densities determine Mn L-edge X-ray absorption energies. Chem Sci 2018; 9:6813-6829. [PMID: 30310614 PMCID: PMC6115617 DOI: 10.1039/c8sc00550h] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Accepted: 07/15/2018] [Indexed: 11/21/2022] Open
Abstract
Transition metals in inorganic systems and metalloproteins can occur in different oxidation states, which makes them ideal redox-active catalysts. To gain a mechanistic understanding of the catalytic reactions, knowledge of the oxidation state of the active metals, ideally in operando, is therefore critical. L-edge X-ray absorption spectroscopy (XAS) is a powerful technique that is frequently used to infer the oxidation state via a distinct blue shift of L-edge absorption energies with increasing oxidation state. A unified description accounting for quantum-chemical notions whereupon oxidation does not occur locally on the metal but on the whole molecule and the basic understanding that L-edge XAS probes the electronic structure locally at the metal has been missing to date. Here we quantify how charge and spin densities change at the metal and throughout the molecule for both redox and core-excitation processes. We explain the origin of the L-edge XAS shift between the high-spin complexes MnII(acac)2 and MnIII(acac)3 as representative model systems and use ab initio theory to uncouple effects of oxidation-state changes from geometric effects. The shift reflects an increased electron affinity of MnIII in the core-excited states compared to the ground state due to a contraction of the Mn 3d shell upon core-excitation with accompanied changes in the classical Coulomb interactions. This new picture quantifies how the metal-centered core hole probes changes in formal oxidation state and encloses and substantiates earlier explanations. The approach is broadly applicable to mechanistic studies of redox-catalytic reactions in molecular systems where charge and spin localization/delocalization determine reaction pathways.
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Affiliation(s)
- Markus Kubin
- Institute for Methods and Instrumentation for Synchrotron Radiation Research , Helmholtz-Zentrum Berlin für Materialien und Energie GmbH , Albert-Einstein-Strasse 15 , 12489 Berlin , Germany .
| | - Meiyuan Guo
- Department of Chemistry-Ångström Laboratory , Uppsala University , Sweden .
| | - Thomas Kroll
- SSRL , SLAC National Accelerator Laboratory , Menlo Park , California 94025 , USA
| | - Heike Löchel
- Institute for Nanometre Optics and Technology , Helmholtz-Zentrum Berlin für Materialien und Energie GmbH , Albert-Einstein-Strasse 15 , 12489 Berlin , Germany
| | - Erik Källman
- Department of Chemistry-Ångström Laboratory , Uppsala University , Sweden .
| | - Michael L Baker
- The School of Chemistry , The University of Manchester at Harwell , Didcot , OX11 OFA , UK
| | - Rolf Mitzner
- Institute for Methods and Instrumentation for Synchrotron Radiation Research , Helmholtz-Zentrum Berlin für Materialien und Energie GmbH , Albert-Einstein-Strasse 15 , 12489 Berlin , Germany .
| | - Sheraz Gul
- Molecular Biophysics and Integrated Bioimaging Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , USA
| | - Jan Kern
- Molecular Biophysics and Integrated Bioimaging Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , USA
- LCLS , SLAC National Accelerator Laboratory , Menlo Park , California 94025 , USA
| | - Alexander Föhlisch
- Institute for Methods and Instrumentation for Synchrotron Radiation Research , Helmholtz-Zentrum Berlin für Materialien und Energie GmbH , Albert-Einstein-Strasse 15 , 12489 Berlin , Germany .
- Institut für Physik und Astronomie , Universität Potsdam , Karl-Liebknecht-Strasse 24/25 , 14476 Potsdam , Germany
| | - Alexei Erko
- Institute for Nanometre Optics and Technology , Helmholtz-Zentrum Berlin für Materialien und Energie GmbH , Albert-Einstein-Strasse 15 , 12489 Berlin , Germany
| | - Uwe Bergmann
- Stanford PULSE Institute , SLAC National Accelerator Laboratory , Menlo Park , California 94025 , USA
| | - Vittal Yachandra
- Molecular Biophysics and Integrated Bioimaging Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , USA
| | - Junko Yano
- Molecular Biophysics and Integrated Bioimaging Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , USA
| | - Marcus Lundberg
- Department of Chemistry-Ångström Laboratory , Uppsala University , Sweden .
| | - Philippe Wernet
- Institute for Methods and Instrumentation for Synchrotron Radiation Research , Helmholtz-Zentrum Berlin für Materialien und Energie GmbH , Albert-Einstein-Strasse 15 , 12489 Berlin , Germany .
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23
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Everett J, Collingwood JF, Tjendana-Tjhin V, Brooks J, Lermyte F, Plascencia-Villa G, Hands-Portman I, Dobson J, Perry G, Telling ND. Nanoscale synchrotron X-ray speciation of iron and calcium compounds in amyloid plaque cores from Alzheimer's disease subjects. NANOSCALE 2018; 10:11782-11796. [PMID: 29688240 PMCID: PMC6034173 DOI: 10.1039/c7nr06794a] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 03/19/2018] [Indexed: 05/11/2023]
Abstract
Altered metabolism of biometals in the brain is a key feature of Alzheimer's disease, and biometal interactions with amyloid-β are linked to amyloid plaque formation. Iron-rich aggregates, including evidence for the mixed-valence iron oxide magnetite, are associated with amyloid plaques. To test the hypothesis that increased chemical reduction of iron, as observed in vitro in the presence of aggregating amyloid-β, may occur at sites of amyloid plaque formation in the human brain, the nanoscale distribution and physicochemical states of biometals, particularly iron, were characterised in isolated amyloid plaque cores from human Alzheimer's disease cases using synchrotron X-ray spectromicroscopy. In situ X-ray magnetic circular dichroism revealed the presence of magnetite: a finding supported by ptychographic observation of an iron oxide crystal with the morphology of biogenic magnetite. The exceptional sensitivity and specificity of X-ray spectromicroscopy, combining chemical and magnetic probes, allowed enhanced differentiation of the iron oxides phases present. This facilitated the discovery and speciation of ferrous-rich phases and lower oxidation state phases resembling zero-valent iron as well as magnetite. Sequestered calcium was discovered in two distinct mineral forms suggesting a dynamic process of amyloid plaque calcification in vivo. The range of iron oxidation states present and the direct observation of biogenic magnetite provide unparalleled support for the hypothesis that chemical reduction of iron arises in conjunction with the formation of amyloid plaques. These new findings raise challenging questions about the relative impacts of amyloid-β aggregation, plaque formation, and disrupted metal homeostasis on the oxidative burden observed in Alzheimer's disease.
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Affiliation(s)
- James Everett
- Institute for Science and Technology in Medicine
, Thornburrow Drive
, Keele University
,
Staffordshire
, ST4 7QB
, UK
- Warwick Engineering in Biomedicine
, School of Engineering
, Library Road
, University of Warwick
,
Coventry
, CV4 7AL
, UK
.
| | - Joanna F. Collingwood
- Warwick Engineering in Biomedicine
, School of Engineering
, Library Road
, University of Warwick
,
Coventry
, CV4 7AL
, UK
.
- Department of Materials Science and Engineering
, University of Florida
,
Gainesville
, FL 32611
, USA
| | - Vindy Tjendana-Tjhin
- Warwick Engineering in Biomedicine
, School of Engineering
, Library Road
, University of Warwick
,
Coventry
, CV4 7AL
, UK
.
| | - Jake Brooks
- Warwick Engineering in Biomedicine
, School of Engineering
, Library Road
, University of Warwick
,
Coventry
, CV4 7AL
, UK
.
| | - Frederik Lermyte
- Warwick Engineering in Biomedicine
, School of Engineering
, Library Road
, University of Warwick
,
Coventry
, CV4 7AL
, UK
.
| | - Germán Plascencia-Villa
- Department of Physics and Astronomy. The University of Texas at San Antonio (UTSA)
,
San Antonio
, TX
78249
, USA
| | - Ian Hands-Portman
- School of Life Sciences
, Gibbet Hill Campus
, University of Warwick
,
Coventry
, CV4 7AL
, UK
| | - Jon Dobson
- Department of Materials Science and Engineering
, University of Florida
,
Gainesville
, FL 32611
, USA
- J. Crayton Pruitt Family Department of Biomedical Engineering
, Institute for Cell and Tissue Science & Engineering
, University of Florida
,
Gainesville
, FL 32611
, USA
| | - George Perry
- Department of Biology and UTSA Neurosciences Institute. The University of Texas at San Antonio (UTSA)
,
San Antonio
, TX
78249
, USA
| | - Neil D. Telling
- Institute for Science and Technology in Medicine
, Thornburrow Drive
, Keele University
,
Staffordshire
, ST4 7QB
, UK
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24
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Kubin M, Kern J, Guo M, Källman E, Mitzner R, Yachandra VK, Lundberg M, Yano J, Wernet P. X-ray-induced sample damage at the Mn L-edge: a case study for soft X-ray spectroscopy of transition metal complexes in solution. Phys Chem Chem Phys 2018; 20:16817-16827. [PMID: 29888772 PMCID: PMC6011208 DOI: 10.1039/c8cp03094d] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
X-ray induced sample damage can impede electronic and structural investigations of radiation-sensitive samples studied with X-rays. Here we quantify dose-dependent sample damage to the prototypical MnIII(acac)3 complex in solution and at room temperature for the soft X-ray range, using X-ray absorption spectroscopy at the Mn L-edge. We observe the appearance of a reduced MnII species as the X-ray dose is increased. We find a half-damage dose of 1.6 MGy and quantify a spectroscopically tolerable dose on the order of 0.3 MGy (1 Gy = 1 J kg-1), where 90% of MnIII(acac)3 are intact. Our dose-limit is around one order of magnitude lower than the Henderson limit (half-damage dose of 20 MGy) which is commonly employed for protein crystallography with hard X-rays. It is comparable, however, to the dose-limits obtained for collecting un-damaged Mn K-edge spectra of the photosystem II protein, using hard X-rays. The dose-dependent reduction of MnIII observed here for solution samples occurs at a dose limit that is two to four orders of magnitude smaller than the dose limits previously reported for soft X-ray spectroscopy of iron samples in the solid phase. We compare our measured to calculated spectra from ab initio restricted active space (RAS) theory and discuss possible mechanisms for the observed dose-dependent damage of MnIII(acac)3 in solution. On the basis of our results, we assess the influence of sample damage in other experimental studies with soft X-rays from storage-ring synchrotron radiation sources and X-ray free-electron lasers.
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Affiliation(s)
- Markus Kubin
- Institute for Methods and Instrumentation for Synchrotron Radiation Research, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 15, 12489 Berlin, Germany.
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25
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Chantzis A, Kowalska JK, Maganas D, DeBeer S, Neese F. Ab Initio Wave Function-Based Determination of Element Specific Shifts for the Efficient Calculation of X-ray Absorption Spectra of Main Group Elements and First Row Transition Metals. J Chem Theory Comput 2018; 14:3686-3702. [DOI: 10.1021/acs.jctc.8b00249] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Agisilaos Chantzis
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Joanna K. Kowalska
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Dimitrios Maganas
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Frank Neese
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
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26
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Van Kuiken BE, Hahn AW, Nayyar B, Schiewer CE, Lee SC, Meyer F, Weyhermüller T, Nicolaou A, Cui YT, Miyawaki J, Harada Y, DeBeer S. Electronic Spectra of Iron–Sulfur Complexes Measured by 2p3d RIXS Spectroscopy. Inorg Chem 2018; 57:7355-7361. [DOI: 10.1021/acs.inorgchem.8b01010] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Benjamin E. Van Kuiken
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Anselm W. Hahn
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Brahamjot Nayyar
- Department of Chemistry, University of Waterloo, Waterloo N2L 3G1, Canada
| | - Christine E. Schiewer
- Institute of Inorganic Chemistry, University of Göttingen, Tammannstr. 4, D-37077 Göttingen, Germany
| | - Sonny C. Lee
- Department of Chemistry, University of Waterloo, Waterloo N2L 3G1, Canada
| | - Franc Meyer
- Institute of Inorganic Chemistry, University of Göttingen, Tammannstr. 4, D-37077 Göttingen, Germany
| | - Thomas Weyhermüller
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | | | - Yi-Tao Cui
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Jun Miyawaki
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Yoshihisa Harada
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
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27
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Bagus PS, Ilton E, Nelin CJ. Extracting Chemical Information from XPS Spectra: A Perspective. Catal Letters 2018. [DOI: 10.1007/s10562-018-2417-1] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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28
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Singh JP, Kaur B, Sharma A, Kim SH, Gautam S, Srivastava RC, Goyal N, Lim WC, Lin HJ, Chen JM, Asokan K, Kanjilal D, Won SO, Lee IJ, Chae KH. Mechanistic insights into the interaction between energetic oxygen ions and nanosized ZnFe2O4: XAS-XMCD investigations. Phys Chem Chem Phys 2018; 20:12084-12096. [DOI: 10.1039/c8cp00368h] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Irradiation of nanosized zinc ferrite with swift heavy ions leads to cation redistribution and changes in magnetic interactions.
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29
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Bagus PS, Nelin CJ, Sassi M, Ilton ES, Rosso KM. Consequences of realistic embedding for the L2,3 edge XAS of α-Fe2O3. Phys Chem Chem Phys 2018; 20:4396-4403. [DOI: 10.1039/c7cp06926j] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cluster models of condensed systems are often used to simulate the core-level spectra obtained with X-ray Photoelectron Spectroscopy, XPS, or with X-ray Absorption Spectroscopy, XAS, especially for near edge features.
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Affiliation(s)
- Paul S. Bagus
- Department of Chemistry
- University of North Texas
- Denton
- USA
| | | | - Michel Sassi
- Pacific Northwest National Laboratory
- Richland
- USA
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30
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Bagus PS, Nelin CJ, Ilton ES, Sassi MJ, Rosso KM. Analysis of X-ray adsorption edges: L2,3 edge of FeCl4−. J Chem Phys 2017; 147:224306. [DOI: 10.1063/1.5006223] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Affiliation(s)
- Paul S. Bagus
- Department of Chemistry, University of North Texas, Denton, Texas 76203-5017, USA
| | | | - Eugene S. Ilton
- Pacific Northwest National Laboratory, Richland, Washington 99352, USA
| | - Michel J. Sassi
- Pacific Northwest National Laboratory, Richland, Washington 99352, USA
| | - Kevin M. Rosso
- Pacific Northwest National Laboratory, Richland, Washington 99352, USA
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31
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DeBeer S. Advanced X-ray Spectroscopic Methods for Studying Iron-Sulfur-Containing Proteins and Model Complexes. Methods Enzymol 2017; 599:427-450. [PMID: 29746249 DOI: 10.1016/bs.mie.2017.09.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
In this chapter, a brief overview of X-ray spectroscopic methods that may be utilized to obtain insight into the geometric and electronic structure of iron-sulfur proteins is provided. These methods include conventional methods, such as metal and ligand K-edge X-ray absorption, as well as more advanced methods including nonresonant and resonant X-ray emission. In each section, the basic information content of the spectra is highlighted and important experimental considerations are discussed. Throughout the chapter, recent applications to iron-sulfur-containing models and proteins are highlighted.
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Affiliation(s)
- Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr, Germany.
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