1
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Canton SE, Biednov M, Pápai M, Lima FA, Choi T, Otte F, Jiang Y, Frankenberger P, Knoll M, Zalden P, Gawelda W, Rahaman A, Møller KB, Milne C, Gosztola DJ, Zheng K, Retegan M, Khakhulin D. Ultrafast Jahn-Teller Photoswitching in Cobalt Single-Ion Magnets. Adv Sci (Weinh) 2023; 10:e2206880. [PMID: 37196414 PMCID: PMC10375196 DOI: 10.1002/advs.202206880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 01/24/2023] [Indexed: 05/19/2023]
Abstract
Single-ion magnets (SIMs) constitute the ultimate size limit in the quest for miniaturizing magnetic materials. Several bottlenecks currently hindering breakthroughs in quantum information and communication technologies could be alleviated by new generations of SIMs displaying multifunctionality. Here, ultrafast optical absorption spectroscopy and X-ray emission spectroscopy are employed to track the photoinduced spin-state switching of the prototypical complex [Co(terpy)2 ]2+ (terpy = 2,2':6',2″-terpyridine) in solution phase. The combined measurements and their analysis supported by density functional theory (DFT), time-dependent-DFT (TD-DFT) and multireference quantum chemistry calculations reveal that the complex undergoes a spin-state transition from a tetragonally elongated doublet state to a tetragonally compressed quartet state on the femtosecond timescale, i.e., it sustains ultrafast Jahn-Teller (JT) photoswitching between two different spin multiplicities. Adding new Co-based complexes as possible contenders in the search for JT photoswitching SIMs will greatly widen the possibilities for implementing magnetic multifunctionality and eventually controlling ultrafast magnetization with optical photons.
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Affiliation(s)
- Sophie E. Canton
- European XFELHolzkoppel 422869SchenefeldGermany
- Department of ChemistryTechnical University of DenmarkKongensLyngbyDK‐2800Denmark
| | | | - Mátyás Pápai
- Department of ChemistryTechnical University of DenmarkKongensLyngbyDK‐2800Denmark
- Wigner Research Centre for PhysicsP.O. Box 49BudapestH‐1525Hungary
| | | | - Tae‐Kyu Choi
- European XFELHolzkoppel 422869SchenefeldGermany
- XFEL DivisionPohang Accelerator LaboratoryJigok‐ro 127‐80Pohang37673Republic of Korea
| | | | | | | | | | | | - Wojciech Gawelda
- European XFELHolzkoppel 422869SchenefeldGermany
- Departamento de QuímicaUniversidad Autónoma de MadridMadrid28049Spain
- IMDEA‐NanocienciaCalle Faraday 9Madrid28049Spain
- Faculty of PhysicsAdam Mickiewicz UniversityPoznan61‐614Poland
| | - Ahibur Rahaman
- Department of ChemistryTechnical University of DenmarkKongensLyngbyDK‐2800Denmark
- Chemical Physics and NanoLundLund UniversityBox 124Lund22100Sweden
| | - Klaus B. Møller
- Department of ChemistryTechnical University of DenmarkKongensLyngbyDK‐2800Denmark
| | | | - David J. Gosztola
- Center for Nanoscale MaterialsArgonne National Laboratory9700 South Cass AvenueLemontIL60439USA
| | - Kaibo Zheng
- Department of ChemistryTechnical University of DenmarkKongensLyngbyDK‐2800Denmark
- Chemical Physics and NanoLundLund UniversityBox 124Lund22100Sweden
| | - Marius Retegan
- European Synchrotron Radiation Facility71 Avenue des MartyrsGrenoble38000France
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2
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Bacellar C, Rouxel JR, Ingle RA, Mancini GF, Kinschel D, Cannelli O, Zhao Y, Cirelli C, Knopp G, Szlachetko J, Lima FA, Menzi S, Ozerov D, Pamfilidis G, Kubicek K, Khakhulin D, Gawelda W, Rodriguez-Fernandez A, Biednov M, Bressler C, Arrell CA, Johnson PJM, Milne CJ, Chergui M. Ultrafast Energy Transfer from Photoexcited Tryptophan to the Haem in Cytochrome c. J Phys Chem Lett 2023; 14:2425-2432. [PMID: 36862109 DOI: 10.1021/acs.jpclett.3c00218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
We report femtosecond Fe K-edge absorption (XAS) and nonresonant X-ray emission (XES) spectra of ferric cytochrome C (Cyt c) upon excitation of the haem (>300 nm) or mixed excitation of the haem and tryptophan (<300 nm). The XAS and XES transients obtained in both excitation energy ranges show no evidence for electron transfer processes between photoexcited tryptophan (Trp) and the haem, but rather an ultrafast energy transfer, in agreement with previous ultrafast optical fluorescence and transient absorption studies. The reported (J. Phys. Chem. B 2011, 115 (46), 13723-13730) decay times of Trp fluorescence in ferrous (∼350 fs) and ferric (∼700 fs) Cyt c are among the shortest ever reported for Trp in a protein. The observed time scales cannot be rationalized in terms of Förster or Dexter energy transfer mechanisms and call for a more thorough theoretical investigation.
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Affiliation(s)
- Camila Bacellar
- Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratoire de Spectroscopie Ultrarapide (LSU), ISIC and Lausanne Centre for Ultrafast Science (LACUS), CH-1015 Lausanne, Switzerland
- SwissFEL, Paul-Scherrer-Institut (PSI), 5232 Villigen PSI, Switzerland
| | - Jérémy R Rouxel
- Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratoire de Spectroscopie Ultrarapide (LSU), ISIC and Lausanne Centre for Ultrafast Science (LACUS), CH-1015 Lausanne, Switzerland
- Univ Lyon, UJM-Saint-Etienne, CNRS, Graduate School Optics Institute, Laboratoire Hubert Curien, UMR 5516, Saint-Etienne F-42023, France
| | - Rebecca A Ingle
- Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratoire de Spectroscopie Ultrarapide (LSU), ISIC and Lausanne Centre for Ultrafast Science (LACUS), CH-1015 Lausanne, Switzerland
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Giulia F Mancini
- Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratoire de Spectroscopie Ultrarapide (LSU), ISIC and Lausanne Centre for Ultrafast Science (LACUS), CH-1015 Lausanne, Switzerland
- 2Laboratory for Ultrafast X-ray and Electron Microscopy, Department of Physics, University of Pavia, Via Agostino Bassi 6, 27100 Pavia PV, Italy
| | - Dominik Kinschel
- Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratoire de Spectroscopie Ultrarapide (LSU), ISIC and Lausanne Centre for Ultrafast Science (LACUS), CH-1015 Lausanne, Switzerland
| | - Oliviero Cannelli
- Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratoire de Spectroscopie Ultrarapide (LSU), ISIC and Lausanne Centre for Ultrafast Science (LACUS), CH-1015 Lausanne, Switzerland
| | - Yang Zhao
- Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratoire de Spectroscopie Ultrarapide (LSU), ISIC and Lausanne Centre for Ultrafast Science (LACUS), CH-1015 Lausanne, Switzerland
| | - Claudio Cirelli
- SwissFEL, Paul-Scherrer-Institut (PSI), 5232 Villigen PSI, Switzerland
| | - Gregor Knopp
- SwissFEL, Paul-Scherrer-Institut (PSI), 5232 Villigen PSI, Switzerland
| | - Jakub Szlachetko
- SOLARIS National Synchrotron Radiation Centre, Jagiellonian University, 30-392 Kraków, Poland
| | | | - Samuel Menzi
- SwissFEL, Paul-Scherrer-Institut (PSI), 5232 Villigen PSI, Switzerland
| | - Dmitry Ozerov
- SwissFEL, Paul-Scherrer-Institut (PSI), 5232 Villigen PSI, Switzerland
| | | | | | | | - Wojciech Gawelda
- European XFEL, Holzkoppel 4, D-22869 Schenefeld, Germany
- Faculty of Physics, Adam Mickiewicz University, ul. Uniwersytetu Poznanskiego 2, 61-614 Poznan, Poland
- Departamento de Química, Universidad Autónoma de Madrid, 28049 Madrid, Spain
- IMDEA Nanociencia, Calle Faraday 9, 28049 Madrid, Spain
| | | | - Mykola Biednov
- European XFEL, Holzkoppel 4, D-22869 Schenefeld, Germany
| | | | | | | | - Christopher J Milne
- SwissFEL, Paul-Scherrer-Institut (PSI), 5232 Villigen PSI, Switzerland
- European XFEL, Holzkoppel 4, D-22869 Schenefeld, Germany
| | - Majed Chergui
- Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratoire de Spectroscopie Ultrarapide (LSU), ISIC and Lausanne Centre for Ultrafast Science (LACUS), CH-1015 Lausanne, Switzerland
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3
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Katayama T, Choi TK, Khakhulin D, Dohn AO, Milne CJ, Vankó G, Németh Z, Lima FA, Szlachetko J, Sato T, Nozawa S, Adachi SI, Yabashi M, Penfold TJ, Gawelda W, Levi G. Atomic-scale observation of solvent reorganization influencing photoinduced structural dynamics in a copper complex photosensitizer. Chem Sci 2023; 14:2572-2584. [PMID: 36908966 PMCID: PMC9993854 DOI: 10.1039/d2sc06600a] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 01/30/2023] [Indexed: 02/04/2023] Open
Abstract
Photochemical reactions in solution are governed by a complex interplay between transient intramolecular electronic and nuclear structural changes and accompanying solvent rearrangements. State-of-the-art time-resolved X-ray solution scattering has emerged in the last decade as a powerful technique to observe solute and solvent motions in real time. However, disentangling solute and solvent dynamics and how they mutually influence each other remains challenging. Here, we simultaneously measure femtosecond X-ray emission and scattering to track both the intramolecular and solvation structural dynamics following photoexcitation of a solvated copper photosensitizer. Quantitative analysis assisted by molecular dynamics simulations reveals a two-step ligand flattening strongly coupled to the solvent reorganization, which conventional optical methods could not discern. First, a ballistic flattening triggers coherent motions of surrounding acetonitrile molecules. In turn, the approach of acetonitrile molecules to the copper atom mediates the decay of intramolecular coherent vibrations and induces a further ligand flattening. These direct structural insights reveal that photoinduced solute and solvent motions can be intimately intertwined, explaining how the key initial steps of light harvesting are affected by the solvent on the atomic time and length scale. Ultimately, this work takes a step forward in understanding the microscopic mechanisms of the bidirectional influence between transient solvent reorganization and photoinduced solute structural dynamics.
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Affiliation(s)
- Tetsuo Katayama
- Japan Synchrotron Radiation Research Institute Kouto 1-1-1, Sayo Hyogo 679-5198 Japan.,RIKEN SPring-8 Center 1-1-1 Kouto, Sayo Hyogo 679-5148 Japan
| | - Tae-Kyu Choi
- XFEL Division, Pohang Accelerator Laboratory Jigok-ro 127-80 Pohang 37673 Republic of Korea
| | | | - Asmus O Dohn
- Science Institute, University of Iceland 107 Reykjavík Iceland .,DTU Physics, Technical University of Denmark Kongens Lyngby Denmark
| | | | - György Vankó
- Wigner Research Centre for Physics, Hungarian Academy of Sciences H-1525 Budapest Hungary
| | - Zoltán Németh
- Wigner Research Centre for Physics, Hungarian Academy of Sciences H-1525 Budapest Hungary
| | | | - Jakub Szlachetko
- SOLARIS National Synchrotron Radiation Centre, Jagiellonian University PL-30392 Kraków Poland
| | - Tokushi Sato
- European XFEL Holzkoppel 4, Schenefeld 22869 Germany
| | - Shunsuke Nozawa
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK) 1-1 Oho Tsukuba Ibaraki 305-0801 Japan.,Department of Materials Structure Science, School of High Energy Accelerator Science, The Graduate University for Advanced Studies 1-1 Oho Tsukuba Ibaraki 305-0801 Japan
| | - Shin-Ichi Adachi
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK) 1-1 Oho Tsukuba Ibaraki 305-0801 Japan.,Department of Materials Structure Science, School of High Energy Accelerator Science, The Graduate University for Advanced Studies 1-1 Oho Tsukuba Ibaraki 305-0801 Japan
| | - Makina Yabashi
- RIKEN SPring-8 Center 1-1-1 Kouto, Sayo Hyogo 679-5148 Japan
| | - Thomas J Penfold
- Chemistry-School of Natural and Environmental Sciences, Newcastle University Newcastle Upon-Tyne NE1 7RU UK
| | - Wojciech Gawelda
- Departamento de Química, Universidad Autónoma de Madrid, Campus Cantoblanco 28047 Madrid Spain.,IMDEA-Nanociencia, Campus Cantoblanco C/Faraday 9 28049 Madrid Spain.,Faculty of Physics, Adam Mickiewicz University 61-614 Poznań Poland
| | - Gianluca Levi
- Science Institute, University of Iceland 107 Reykjavík Iceland
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4
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Vakili M, Bielecki J, Knoška J, Otte F, Han H, Kloos M, Schubert R, Delmas E, Mills G, de Wijn R, Letrun R, Dold S, Bean R, Round A, Kim Y, Lima FA, Dörner K, Valerio J, Heymann M, Mancuso AP, Schulz J. 3D printed devices and infrastructure for liquid sample delivery at the European XFEL. J Synchrotron Radiat 2022; 29:331-346. [PMID: 35254295 PMCID: PMC8900844 DOI: 10.1107/s1600577521013370] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 12/16/2021] [Indexed: 06/14/2023]
Abstract
The Sample Environment and Characterization (SEC) group of the European X-ray Free-Electron Laser (EuXFEL) develops sample delivery systems for the various scientific instruments, including systems for the injection of liquid samples that enable serial femtosecond X-ray crystallography (SFX) and single-particle imaging (SPI) experiments, among others. For rapid prototyping of various device types and materials, sub-micrometre precision 3D printers are used to address the specific experimental conditions of SFX and SPI by providing a large number of devices with reliable performance. This work presents the current pool of 3D printed liquid sample delivery devices, based on the two-photon polymerization (2PP) technique. These devices encompass gas dynamic virtual nozzles (GDVNs), mixing-GDVNs, high-viscosity extruders (HVEs) and electrospray conical capillary tips (CCTs) with highly reproducible geometric features that are suitable for time-resolved SFX and SPI experiments at XFEL facilities. Liquid sample injection setups and infrastructure on the Single Particles, Clusters, and Biomolecules and Serial Femtosecond Crystallography (SPB/SFX) instrument are described, this being the instrument which is designated for biological structure determination at the EuXFEL.
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Affiliation(s)
| | | | - Juraj Knoška
- Center for Free-Electron Laser Science (CFEL), Deutsches Elektronen-Synchrotron (DESY), Notkestrasse 85, 22607 Hamburg, Germany
| | - Florian Otte
- European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany
- Department of Physics, TU Dortmund, Otto-Hahn-Straße 4, 44221 Dortmund, Germany
| | - Huijong Han
- European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany
| | - Marco Kloos
- European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany
| | | | - Elisa Delmas
- European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany
| | - Grant Mills
- European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany
| | | | - Romain Letrun
- European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany
| | - Simon Dold
- European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany
| | - Richard Bean
- European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany
| | - Adam Round
- European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany
- School of Chemical and Physical Sciences, Keele University, Staffordshire ST5 5AZ, United Kingdom
| | - Yoonhee Kim
- European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany
| | | | | | - Joana Valerio
- European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany
| | - Michael Heymann
- Institute for Biomaterials and Biomolecular Systems (IBBS), University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
| | - Adrian P. Mancuso
- European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science (LIMS), La Trobe University, Melbourne 3086, Australia
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5
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Leroy L, Pimenta LG, Calazans LF, Ribeiro MA, Lima FA, Alexandre S, Shultz DA, Chergui M, Pinheiro CB. Mapping the thermo-induced valence tautomerism in cobalt dioxolane single crystals. Acta Crystallogr A Found Adv 2021. [DOI: 10.1107/s0108767321084415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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6
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Bacellar C, Kinschel D, Cannelli O, Sorokin B, Katayama T, Mancini GF, Rouxel JR, Obara Y, Nishitani J, Ito H, Ito T, Kurahashi N, Higashimura C, Kudo S, Cirelli C, Knopp G, Nass K, Johnson PJM, Wach A, Szlachetko J, Lima FA, Milne CJ, Yabashi M, Suzuki T, Misawa K, Chergui M. Femtosecond X-ray spectroscopy of haem proteins. Faraday Discuss 2021; 228:312-328. [PMID: 33565544 DOI: 10.1039/d0fd00131g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We discuss our recently reported femtosecond (fs) X-ray emission spectroscopy results on the ligand dissociation and recombination in nitrosylmyoglobin (MbNO) in the context of previous studies on ferrous haem proteins. We also present a preliminary account of femtosecond X-ray absorption studies on MbNO, pointing to the presence of more than one species formed upon photolysis.
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Affiliation(s)
- Camila Bacellar
- Laboratoire de Spectroscopie Ultrarapide (LSU), Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.
| | - Dominik Kinschel
- Laboratoire de Spectroscopie Ultrarapide (LSU), Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.
| | - Oliviero Cannelli
- Laboratoire de Spectroscopie Ultrarapide (LSU), Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.
| | - Boris Sorokin
- Laboratoire de Spectroscopie Ultrarapide (LSU), Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.
| | - Tetsuo Katayama
- Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1, Kouto, Sayo-cho Sayo-gun, Hyogo 679-5198, Japan
| | - Giulia F Mancini
- Laboratoire de Spectroscopie Ultrarapide (LSU), Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.
| | - Jeremy R Rouxel
- Laboratoire de Spectroscopie Ultrarapide (LSU), Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.
| | - Yuki Obara
- Tokyo University of Agriculture and Technology (TUAT), 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Junichi Nishitani
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-Ku, Kyoto 606-8502, Japan
| | - Hironori Ito
- Tokyo University of Agriculture and Technology (TUAT), 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Terumasa Ito
- Tokyo University of Agriculture and Technology (TUAT), 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Naoya Kurahashi
- Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, Kioicho, 7-1, Chiyoda, 102-8554 Tokyo, Japan
| | - Chika Higashimura
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-Ku, Kyoto 606-8502, Japan
| | - Shotaro Kudo
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-Ku, Kyoto 606-8502, Japan
| | - Claudio Cirelli
- SwissFEL, Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
| | - Gregor Knopp
- SwissFEL, Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
| | - Karol Nass
- SwissFEL, Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
| | | | - Anna Wach
- Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Krakow, Poland
| | - Jakub Szlachetko
- Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Krakow, Poland
| | | | | | - Makina Yabashi
- Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1, Kouto, Sayo-cho Sayo-gun, Hyogo 679-5198, Japan
| | - Toshinori Suzuki
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-Ku, Kyoto 606-8502, Japan
| | - Kazuhiko Misawa
- Tokyo University of Agriculture and Technology (TUAT), 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Majed Chergui
- Laboratoire de Spectroscopie Ultrarapide (LSU), Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.
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7
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Bacellar C, Kinschel D, Mancini GF, Ingle RA, Rouxel J, Cannelli O, Cirelli C, Knopp G, Szlachetko J, Lima FA, Menzi S, Pamfilidis G, Kubicek K, Khakhulin D, Gawelda W, Rodriguez-Fernandez A, Biednov M, Bressler C, Arrell CA, Johnson PJM, Milne CJ, Chergui M. Spin cascade and doming in ferric hemes: Femtosecond X-ray absorption and X-ray emission studies. Proc Natl Acad Sci U S A 2020; 117:21914-21920. [PMID: 32848065 PMCID: PMC7486745 DOI: 10.1073/pnas.2009490117] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
The structure-function relationship is at the heart of biology, and major protein deformations are correlated to specific functions. For ferrous heme proteins, doming is associated with the respiratory function in hemoglobin and myoglobins. Cytochrome c (Cyt c) has evolved to become an important electron-transfer protein in humans. In its ferrous form, it undergoes ligand release and doming upon photoexcitation, but its ferric form does not release the distal ligand, while the return to the ground state has been attributed to thermal relaxation. Here, by combining femtosecond Fe Kα and Kβ X-ray emission spectroscopy (XES) with Fe K-edge X-ray absorption near-edge structure (XANES), we demonstrate that the photocycle of ferric Cyt c is entirely due to a cascade among excited spin states of the iron ion, causing the ferric heme to undergo doming, which we identify. We also argue that this pattern is common to a wide diversity of ferric heme proteins, raising the question of the biological relevance of doming in such proteins.
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Affiliation(s)
- Camila Bacellar
- Laboratoire de Spectroscopie Ultrarapide, Institut des Sciences et Ingéniéries Chimiques and Lausanne Centre for Ultrafast Science, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Dominik Kinschel
- Laboratoire de Spectroscopie Ultrarapide, Institut des Sciences et Ingéniéries Chimiques and Lausanne Centre for Ultrafast Science, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Giulia F Mancini
- Laboratoire de Spectroscopie Ultrarapide, Institut des Sciences et Ingéniéries Chimiques and Lausanne Centre for Ultrafast Science, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Rebecca A Ingle
- Laboratoire de Spectroscopie Ultrarapide, Institut des Sciences et Ingéniéries Chimiques and Lausanne Centre for Ultrafast Science, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Jérémy Rouxel
- Laboratoire de Spectroscopie Ultrarapide, Institut des Sciences et Ingéniéries Chimiques and Lausanne Centre for Ultrafast Science, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Oliviero Cannelli
- Laboratoire de Spectroscopie Ultrarapide, Institut des Sciences et Ingéniéries Chimiques and Lausanne Centre for Ultrafast Science, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Claudio Cirelli
- Swiss Free Electron Laser, Paul-Scherrer-Institut (PSI), 5232 Villigen PSI, Switzerland
| | - Gregor Knopp
- Swiss Free Electron Laser, Paul-Scherrer-Institut (PSI), 5232 Villigen PSI, Switzerland
| | - Jakub Szlachetko
- Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Kraków, Poland
| | | | - Samuel Menzi
- Swiss Free Electron Laser, Paul-Scherrer-Institut (PSI), 5232 Villigen PSI, Switzerland
| | - Georgios Pamfilidis
- Swiss Free Electron Laser, Paul-Scherrer-Institut (PSI), 5232 Villigen PSI, Switzerland
| | | | | | - Wojciech Gawelda
- European X-ray Free Electron Laser, D-22869 Schenefeld, Germany
- Faculty of Physics, Adam Mickiewicz University, 61-614 Poznan, Poland
| | | | - Mykola Biednov
- European X-ray Free Electron Laser, D-22869 Schenefeld, Germany
| | | | - Christopher A Arrell
- Swiss Free Electron Laser, Paul-Scherrer-Institut (PSI), 5232 Villigen PSI, Switzerland
| | - Philip J M Johnson
- Swiss Free Electron Laser, Paul-Scherrer-Institut (PSI), 5232 Villigen PSI, Switzerland
| | - Christopher J Milne
- Swiss Free Electron Laser, Paul-Scherrer-Institut (PSI), 5232 Villigen PSI, Switzerland
| | - Majed Chergui
- Laboratoire de Spectroscopie Ultrarapide, Institut des Sciences et Ingéniéries Chimiques and Lausanne Centre for Ultrafast Science, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland;
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8
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Aðalsteinsson HM, Lima FA, Galuppo C, Abbehausen C. Evaluation of cobalt complexes with tripod ligands for zinc finger targeting. Dalton Trans 2020; 49:16143-16153. [DOI: 10.1039/d0dt00067a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
We report the ability of CoII and CoIII complexes of tri(2-pyridylmethyl)amine and N,N-di(2-pyridylmethyl)glycinate to disrupt zinc fingers.
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Affiliation(s)
| | - Frederico A. Lima
- European X-Ray Free-Electron Laser Facility GmbH
- 22869 Schenefeld
- Germany
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9
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Lima FA, Santos OS, Pomella AWV, Ribeiro EJ, Resende MM. Culture Medium Evaluation Using Low‐Cost Substrate for Biosurfactants Lipopeptides Production by
Bacillus amyloliquefaciens
in Pilot Bioreactor. J SURFACTANTS DETERG 2019. [DOI: 10.1002/jsde.12350] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Frederico A. Lima
- Chemical Engineering FacultyFederal University of Uberlândia, P.O. Box 593, Av. João Naves de Ávila 2121, Campus Santa Mônica, Bloco 1K Uberlândia MG 38408‐144 Brazil
| | - Olga Silva Santos
- Chemical Engineering FacultyFederal University of Uberlândia, P.O. Box 593, Av. João Naves de Ávila 2121, Campus Santa Mônica, Bloco 1K Uberlândia MG 38408‐144 Brazil
| | - Alan William Vilela Pomella
- Laboratório de BioControle Farroupilha S.A., Lallemand, Av. Júlia Fernandes Caixeta n°55, Bairro Cidade Nova Patos de Minas MG 38706‐420 Brazil
| | - Eloízio J. Ribeiro
- Chemical Engineering FacultyFederal University of Uberlândia, P.O. Box 593, Av. João Naves de Ávila 2121, Campus Santa Mônica, Bloco 1K Uberlândia MG 38408‐144 Brazil
| | - Miriam Maria Resende
- Chemical Engineering FacultyFederal University of Uberlândia, P.O. Box 593, Av. João Naves de Ávila 2121, Campus Santa Mônica, Bloco 1K Uberlândia MG 38408‐144 Brazil
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10
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Katayama T, Northey T, Gawelda W, Milne CJ, Vankó G, Lima FA, Bohinc R, Németh Z, Nozawa S, Sato T, Khakhulin D, Szlachetko J, Togashi T, Owada S, Adachi SI, Bressler C, Yabashi M, Penfold TJ. Tracking multiple components of a nuclear wavepacket in photoexcited Cu(I)-phenanthroline complex using ultrafast X-ray spectroscopy. Nat Commun 2019; 10:3606. [PMID: 31399565 PMCID: PMC6689108 DOI: 10.1038/s41467-019-11499-w] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 07/18/2019] [Indexed: 11/09/2022] Open
Abstract
Disentangling the strong interplay between electronic and nuclear degrees of freedom is essential to achieve a full understanding of excited state processes during ultrafast nonadiabatic chemical reactions. However, the complexity of multi-dimensional potential energy surfaces means that this remains challenging. The energy flow during vibrational and electronic relaxation processes can be explored with structural sensitivity by probing a nuclear wavepacket using femtosecond time-resolved X-ray Absorption Near Edge Structure (TR-XANES). However, it remains unknown to what level of detail vibrational motions are observable in this X-ray technique. Herein we track the wavepacket dynamics of a prototypical [Cu(2,9-dimethyl-1,10-phenanthroline)2]+ complex using TR-XANES. We demonstrate that sensitivity to individual wavepacket components can be modulated by the probe energy and that the bond length change associated with molecular breathing mode can be tracked with a sub-Angstrom resolution beyond optical-domain observables. Importantly, our results reveal how state-of-the-art TR-XANES provides deeper insights of ultrafast nonadiabatic chemical reactions.
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Affiliation(s)
- Tetsuo Katayama
- Japan Synchrotron Radiation Research Institute, Kouto 1-1-1, Sayo, Hyogo, 679-5198, Japan. .,RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan.
| | - Thomas Northey
- Chemistry-School of Natural and Environmental Sciences, Newcastle University, Newcastle Upon-Tyne, NE1 7RU, UK
| | - Wojciech Gawelda
- European XFEL, Holzkoppel 4, 22869, Schenefeld, Germany.,Faculty of Physics, Adam Mickiewicz University, 61-614, Poznań, Poland
| | | | - György Vankó
- Wigner Research Centre for Physics, Hungarian Academy of Sciences, 1525, Budapest, Hungary
| | | | - Rok Bohinc
- SwissFEL, Paul Scherrer Institut, 5232, Villigen-PSI, Switzerland
| | - Zoltán Németh
- Wigner Research Centre for Physics, Hungarian Academy of Sciences, 1525, Budapest, Hungary
| | - Shunsuke Nozawa
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki, 305-0801, Japan.,Department of Materials Structure Science, School of High Energy Accelerator Science, The Graduate University for Advanced Studies, 1-1 Oho, Tsukuba, Ibaraki, 305-0801, Japan
| | - Tokushi Sato
- European XFEL, Holzkoppel 4, 22869, Schenefeld, Germany.,Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607, Hamburg, Germany
| | | | - Jakub Szlachetko
- Institute of Nuclear Physics, Polish Academy of Sciences, 31-342, Kraków, Poland
| | - Tadashi Togashi
- Japan Synchrotron Radiation Research Institute, Kouto 1-1-1, Sayo, Hyogo, 679-5198, Japan.,RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan
| | - Shigeki Owada
- Japan Synchrotron Radiation Research Institute, Kouto 1-1-1, Sayo, Hyogo, 679-5198, Japan.,RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan
| | - Shin-Ichi Adachi
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki, 305-0801, Japan.,Department of Materials Structure Science, School of High Energy Accelerator Science, The Graduate University for Advanced Studies, 1-1 Oho, Tsukuba, Ibaraki, 305-0801, Japan
| | - Christian Bressler
- European XFEL, Holzkoppel 4, 22869, Schenefeld, Germany.,Centre for Ultrafast Imaging CUI, University of Hamburg, 22761, Hamburg, Germany
| | - Makina Yabashi
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan
| | - Thomas J Penfold
- Chemistry-School of Natural and Environmental Sciences, Newcastle University, Newcastle Upon-Tyne, NE1 7RU, UK.
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11
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de Paiva REF, Du Z, Nakahata DH, Lima FA, Corbi PP, Farrell NP. Gold‐Catalyzed C–S Aryl‐Group Transfer in Zinc Finger Proteins. Angew Chem Int Ed Engl 2018; 57:9305-9309. [DOI: 10.1002/anie.201803082] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Revised: 05/02/2018] [Indexed: 12/15/2022]
Affiliation(s)
- Raphael E. F. de Paiva
- Department of Chemistry Virginia Commonwealth University 1001 W. Main Street Richmond VA 23284-2006 USA
- Institute of Chemistry University of Campinas—UNICAMP P.O. Box 6154, CEP 13083-970 Campinas, São Paulo Brazil
| | - Zhifeng Du
- Department of Chemistry Virginia Commonwealth University 1001 W. Main Street Richmond VA 23284-2006 USA
| | - Douglas H. Nakahata
- Institute of Chemistry University of Campinas—UNICAMP P.O. Box 6154, CEP 13083-970 Campinas, São Paulo Brazil
| | - Frederico A. Lima
- Centro Nacional de Pesquisa em Energia e Materiais Brazilian Synchrotron Light Laboratory—LNLS, 13084-971 Campinas SP Brazil
- European XFEL GmbH Holzkoppel 4 22869 Schenefeld Germany
| | - Pedro P. Corbi
- Institute of Chemistry University of Campinas—UNICAMP P.O. Box 6154, CEP 13083-970 Campinas, São Paulo Brazil
| | - Nicholas P. Farrell
- Department of Chemistry Virginia Commonwealth University 1001 W. Main Street Richmond VA 23284-2006 USA
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12
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Affiliation(s)
- Raphael E. F. de Paiva
- Department of Chemistry Virginia Commonwealth University 1001 W. Main Street Richmond VA 23284-2006 USA
- Institute of Chemistry University of Campinas—UNICAMP P.O. Box 6154, CEP 13083-970 Campinas, São Paulo Brazil
| | - Zhifeng Du
- Department of Chemistry Virginia Commonwealth University 1001 W. Main Street Richmond VA 23284-2006 USA
| | - Douglas H. Nakahata
- Institute of Chemistry University of Campinas—UNICAMP P.O. Box 6154, CEP 13083-970 Campinas, São Paulo Brazil
| | - Frederico A. Lima
- Centro Nacional de Pesquisa em Energia e Materiais Brazilian Synchrotron Light Laboratory—LNLS, 13084-971 Campinas SP Brazil
- European XFEL GmbH Holzkoppel 4 22869 Schenefeld Germany
| | - Pedro P. Corbi
- Institute of Chemistry University of Campinas—UNICAMP P.O. Box 6154, CEP 13083-970 Campinas, São Paulo Brazil
| | - Nicholas P. Farrell
- Department of Chemistry Virginia Commonwealth University 1001 W. Main Street Richmond VA 23284-2006 USA
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13
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Ribeiro MA, Francisco TM, Lima FA, Pinheiro CB. Local structure of metastable cobalt complexes studied by resonant X-ray diffraction. Acta Crystallogr A Found Adv 2017. [DOI: 10.1107/s0108767317096647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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14
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Rees JA, Bjornsson R, Kowalska JK, Lima FA, Schlesier J, Sippel D, Weyhermüller T, Einsle O, Kovacs JA, DeBeer S. Comparative electronic structures of nitrogenase FeMoco and FeVco. Dalton Trans 2017; 46:2445-2455. [PMID: 28154874 PMCID: PMC5322470 DOI: 10.1039/c7dt00128b] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Accepted: 01/25/2017] [Indexed: 12/17/2022]
Abstract
An investigation of the active site cofactors of the molybdenum and vanadium nitrogenases (FeMoco and FeVco) was performed using high-resolution X-ray spectroscopy. Synthetic heterometallic iron-sulfur cluster models and density functional theory calculations complement the study of the MoFe and VFe holoproteins using both non-resonant and resonant X-ray emission spectroscopy. Spectroscopic data show the presence of direct iron-heterometal bonds, which are found to be weaker in FeVco. Furthermore, the interstitial carbide is found to perturb the electronic structures of the cofactors through highly covalent Fe-C bonding. The implications of these conclusions are discussed in light of the differential reactivity of the molybdenum and vanadium nitrogenases towards various substrates. Possible functional roles for both the heterometal and the interstitial carbide are detailed.
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Affiliation(s)
- Julian A Rees
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany. and Department of Chemistry, University of Washington, Box 351700, Seattle, WA 98195-1700, USA.
| | - Ragnar Bjornsson
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany. and Science Institute, University of Iceland, Dunhagi 3, 107 Reykjavik, Iceland
| | - Joanna K Kowalska
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany.
| | - Frederico A Lima
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany. and Centro Nacional de Pesquisa em Energia e Materiais Brazilian Synchrotron Light Laboratory - LNLS Rua Giuseppe Máximo Scolfaro, 10.000 13083-970 Campinas SP, Brazil
| | - Julia Schlesier
- Institute for Biochemistry and BIOSS Centre for Biological Signalling Studies, Albert Ludwigs University Freiburg, Germany.
| | - Daniel Sippel
- Institute for Biochemistry and BIOSS Centre for Biological Signalling Studies, Albert Ludwigs University Freiburg, Germany.
| | - Thomas Weyhermüller
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany.
| | - Oliver Einsle
- Institute for Biochemistry and BIOSS Centre for Biological Signalling Studies, Albert Ludwigs University Freiburg, Germany.
| | - Julie A Kovacs
- Department of Chemistry, University of Washington, Box 351700, Seattle, WA 98195-1700, USA.
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany. and Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA
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15
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Lima FA, Saleta ME, Pagliuca RJS, Eleotério MA, Reis RD, Fonseca Júnior J, Meyer B, Bittar EM, Souza-Neto NM, Granado E. XDS: a flexible beamline for X-ray diffraction and spectroscopy at the Brazilian synchrotron. J Synchrotron Radiat 2016; 23:1538-1549. [PMID: 27787261 DOI: 10.1107/s160057751601403x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Accepted: 09/02/2016] [Indexed: 06/06/2023]
Abstract
The majority of the beamlines at the Brazilian Synchrotron Light Source Laboratory (LNLS) use radiation produced in the storage-ring bending magnets and are therefore currently limited in the flux that can be used in the harder part of the X-ray spectrum (above ∼10 keV). A 4 T superconducting multipolar wiggler (SCW) was recently installed at LNLS in order to improve the photon flux above 10 keV and fulfill the demands set by the materials science community. A new multi-purpose beamline was then installed at the LNLS using the SCW as a photon source. The XDS is a flexible beamline operating in the energy range between 5 and 30 keV, designed to perform experiments using absorption, diffraction and scattering techniques. Most of the work performed at the XDS beamline concentrates on X-ray absorption spectroscopy at energies above 18 keV and high-resolution diffraction experiments. More recently, new setups and photon-hungry experiments such as total X-ray scattering, X-ray diffraction under high pressures, resonant X-ray emission spectroscopy, among others, have started to become routine at XDS. Here, the XDS beamline characteristics, performance and a few new experimental possibilities are described.
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Affiliation(s)
- F A Lima
- Laboratório Nacional de Luz Síncrotron, Caixa Postal 6192, CEP 13084-971, Campinas (SP), Brazil
| | - M E Saleta
- Laboratório Nacional de Luz Síncrotron, Caixa Postal 6192, CEP 13084-971, Campinas (SP), Brazil
| | - R J S Pagliuca
- Laboratório Nacional de Luz Síncrotron, Caixa Postal 6192, CEP 13084-971, Campinas (SP), Brazil
| | - M A Eleotério
- Laboratório Nacional de Luz Síncrotron, Caixa Postal 6192, CEP 13084-971, Campinas (SP), Brazil
| | - R D Reis
- Laboratório Nacional de Luz Síncrotron, Caixa Postal 6192, CEP 13084-971, Campinas (SP), Brazil
| | - J Fonseca Júnior
- Laboratório Nacional de Luz Síncrotron, Caixa Postal 6192, CEP 13084-971, Campinas (SP), Brazil
| | - B Meyer
- Laboratório Nacional de Luz Síncrotron, Caixa Postal 6192, CEP 13084-971, Campinas (SP), Brazil
| | - E M Bittar
- Centro Brasileiro de Pesquisas Físicas, Rua Doutor Xavier Sigaud 150, CEP 22290-180, Rio de Janeiro (RJ), Brazil
| | - N M Souza-Neto
- Laboratório Nacional de Luz Síncrotron, Caixa Postal 6192, CEP 13084-971, Campinas (SP), Brazil
| | - E Granado
- Instituto de Física `Gleb Wataghin', Universidade de Campinas, CEP 13083-859, Campinas (SP), Brazil
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16
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Rees JA, Wandzilak A, Maganas D, Wurster NIC, Hugenbruch S, Kowalska JK, Pollock CJ, Lima FA, Finkelstein KD, DeBeer S. Experimental and theoretical correlations between vanadium K-edge X-ray absorption and Kβ emission spectra. J Biol Inorg Chem 2016; 21:793-805. [PMID: 27251139 PMCID: PMC4989026 DOI: 10.1007/s00775-016-1358-7] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Accepted: 04/29/2016] [Indexed: 11/28/2022]
Abstract
A series of vanadium compounds was studied by K-edge X-ray absorption (XAS) and K[Formula: see text] X-ray emission spectroscopies (XES). Qualitative trends within the datasets, as well as comparisons between the XAS and XES data, illustrate the information content of both methods. The complementary nature of the chemical insight highlights the success of this dual-technique approach in characterizing both the structural and electronic properties of vanadium sites. In particular, and in contrast to XAS or extended X-ray absorption fine structure (EXAFS), we demonstrate that valence-to-core XES is capable of differentiating between ligating atoms with the same identity but different bonding character. Finally, density functional theory (DFT) and time-dependent DFT calculations enable a more detailed, quantitative interpretation of the data. We also establish correction factors for the computational protocols through calibration to experiment. These hard X-ray methods can probe vanadium ions in any oxidation or spin state, and can readily be applied to sample environments ranging from solid-phase catalysts to biological samples in frozen solution. Thus, the combined XAS and XES approach, coupled with DFT calculations, provides a robust tool for the study of vanadium atoms in bioinorganic chemistry.
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Affiliation(s)
- Julian A Rees
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470, Mülheim an der Ruhr, Germany
- Department of Chemistry, University of Washington, Box 351700, Seattle, WA, 98195-1700, USA
| | - Aleksandra Wandzilak
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470, Mülheim an der Ruhr, Germany
- Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, 30-059, Kraków, Poland
| | - Dimitrios Maganas
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470, Mülheim an der Ruhr, Germany
| | - Nicole I C Wurster
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470, Mülheim an der Ruhr, Germany
| | - Stefan Hugenbruch
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470, Mülheim an der Ruhr, Germany
| | - Joanna K Kowalska
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470, Mülheim an der Ruhr, Germany
| | - Christopher J Pollock
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470, Mülheim an der Ruhr, Germany
- Department of Chemistry, The Pennsylvania State University, University Park, PA, 16802, USA
| | - Frederico A Lima
- Centro Nacional de Pesquisa em Energia e Materiais, Laboratório Nacional de Luz Síncrotron, Rua Giuseppe Máximo Scolfaro 10000, Campinas, SP, 13083-970, Brazil
| | - Kenneth D Finkelstein
- Cornell High Energy Synchrotron Source, Wilson Laboratory, Cornell University, Ithaca, NY, 14853, USA
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470, Mülheim an der Ruhr, Germany.
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, 14853, USA.
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Jannuzzi SAV, de Arruda EGR, Lima FA, Ribeiro MA, Brinatti C, Formiga ALB. Enzyme-Like Selectivity on Metalloporphyrin-Catalyzed Oxidation by a Linear Homopolymer. ChemistrySelect 2016. [DOI: 10.1002/slct.201600597] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Sergio A. V. Jannuzzi
- Institute of Chemistry; University of Campinas - UNICAMP; P.O. Box 6154 13083-970 Campinas, SP Brazil
- Department of Chemistry; KU Leuven; Celestijnenlaan 200F B-3001 Leuven Belgium
| | - Eduardo G. R. de Arruda
- Institute of Chemistry; University of Campinas - UNICAMP; P.O. Box 6154 13083-970 Campinas, SP Brazil
| | - Frederico A. Lima
- Centro Nacional de Pesquisa em Energia e Materiais; Laboratório Nacional de Luz Síncrotron; Rua Giuseppe Máximo Scolfaro 10000, 1 3083-970 Campinas, SP Brazil
| | - Marcos A. Ribeiro
- Institute of Chemistry; University of Campinas - UNICAMP; P.O. Box 6154 13083-970 Campinas, SP Brazil
| | - César Brinatti
- Institute of Chemistry; University of Campinas - UNICAMP; P.O. Box 6154 13083-970 Campinas, SP Brazil
| | - André L. B. Formiga
- Institute of Chemistry; University of Campinas - UNICAMP; P.O. Box 6154 13083-970 Campinas, SP Brazil
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18
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Kowalska JK, Hahn AW, Albers A, Schiewer CE, Bjornsson R, Lima FA, Meyer F, DeBeer S. X-ray Absorption and Emission Spectroscopic Studies of [L2Fe2S2](n) Model Complexes: Implications for the Experimental Evaluation of Redox States in Iron-Sulfur Clusters. Inorg Chem 2016; 55:4485-97. [PMID: 27097289 PMCID: PMC5108557 DOI: 10.1021/acs.inorgchem.6b00295] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Herein, a systematic study of [L2Fe2S2](n) model complexes (where L = bis(benzimidazolato) and n = 2-, 3-, 4-) has been carried out using iron and sulfur K-edge X-ray absorption (XAS) and iron Kβ and valence-to-core X-ray emission spectroscopies (XES). These data are used as a test set to evaluate the relative strengths and weaknesses of X-ray core level spectroscopies in assessing redox changes in iron-sulfur clusters. The results are correlated to density functional theory (DFT) calculations of the spectra in order to further support the quantitative information that can be extracted from the experimental data. It is demonstrated that due to canceling effects of covalency and spin state, the information that can be extracted from Fe Kβ XES mainlines is limited. However, a careful analysis of the Fe K-edge XAS data shows that localized valence vs delocalized valence species may be differentiated on the basis of the pre-edge and K-edge energies. These findings are then applied to existing literature Fe K-edge XAS data on the iron protein, P-cluster, and FeMoco sites of nitrogenase. The ability to assess the extent of delocalization in the iron protein vs the P-cluster is highlighted. In addition, possible charge states for FeMoco on the basis of Fe K-edge XAS data are discussed. This study provides an important reference for future X-ray spectroscopic studies of iron-sulfur clusters.
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Affiliation(s)
- Joanna K Kowalska
- Max Planck Institute for Chemical Energy Conversion , Stiftstraße 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Anselm W Hahn
- Max Planck Institute for Chemical Energy Conversion , Stiftstraße 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Antonia Albers
- Institute of Inorganic Chemistry, Georg-August-University Göttingen , Tammannstraße 4, D-37077 Göttingen, Germany
| | - Christine E Schiewer
- Institute of Inorganic Chemistry, Georg-August-University Göttingen , Tammannstraße 4, D-37077 Göttingen, Germany
| | - Ragnar Bjornsson
- Max Planck Institute for Chemical Energy Conversion , Stiftstraße 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Frederico A Lima
- Max Planck Institute for Chemical Energy Conversion , Stiftstraße 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Franc Meyer
- Institute of Inorganic Chemistry, Georg-August-University Göttingen , Tammannstraße 4, D-37077 Göttingen, Germany
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion , Stiftstraße 34-36, D-45470 Mülheim an der Ruhr, Germany.,Department of Chemistry and Chemical Biology, Cornell University , Ithaca, New York 14853, United States
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19
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Abstract
A molybdenum L-edge X-ray absorption spectroscopy (XAS) study is presented for native and oxidized MoFe protein of nitrogenase as well as Mo-Fe model compounds. Recently collected data on MoFe protein (in oxidized and reduced forms) is compared to previously published Mo XAS data on the isolated FeMo cofactor in NMF solution and put in context of the recent Mo K-edge XAS study, which showed a MoIII assignment for the molybdenum atom in FeMoco. The L3-edge data are interpreted within a simple ligand-field model, from which a time-dependent density functional theory (TDDFT) approach is proposed as a way to provide further insights into the analysis of the molybdenum L3-edges. The calculated results reproduce well the relative spectral trends that are observed experimentally. Ultimately, these results give further support for the MoIII assignment in protein-bound FeMoco, as well as isolated FeMoco.
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Affiliation(s)
- Ragnar Bjornsson
- Max-Planck-Institut für Chemische Energiekonversion Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany ; Present address: Science Institute University of Iceland, Dunhaga 3, 107 Reykjavik, Iceland
| | - Mario U Delgado-Jaime
- Max-Planck-Institut für Chemische Energiekonversion Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Frederico A Lima
- Max-Planck-Institut für Chemische Energiekonversion Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany ; Present address: Centro Nacional de Pesquisa,em Energia e Materiais, Brazilian Synchrotron Light Laboratory - LNLS, CP 6192 13084-971 Campinas, SP, Brazil
| | - Daniel Sippel
- Institute for Biochemistry Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79104 Freiburg, Germany
| | - Julia Schlesier
- Institute for Biochemistry Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79104 Freiburg, Germany
| | - Thomas Weyhermüller
- Max-Planck-Institut für Chemische Energiekonversion Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Oliver Einsle
- Institute for Biochemistry Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79104 Freiburg, Germany
| | - Frank Neese
- Max-Planck-Institut für Chemische Energiekonversion Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Serena DeBeer
- Max-Planck-Institut für Chemische Energiekonversion Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
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20
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Lima FA, Penfold TJ, van der Veen RM, Reinhard M, Abela R, Tavernelli I, Rothlisberger U, Benfatto M, Milne CJ, Chergui M. Probing the electronic and geometric structure of ferric and ferrous myoglobins in physiological solutions by Fe K-edge absorption spectroscopy. Phys Chem Chem Phys 2014; 16:1617-31. [PMID: 24317683 DOI: 10.1039/c3cp53683a] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present an iron K-edge X-ray absorption study of carboxymyoglobin (MbCO), nitrosylmyoglobin (MbNO), oxymyoglobin (MbO2), cyanomyoglobin (MbCN), aquomet myoglobin (metMb) and unligated myoglobin (deoxyMb) in physiological media. The analysis of the XANES region is performed using the full-multiple scattering formalism, implemented within the MXAN package. This reveals trends within the heme structure, absent from previous crystallographic and X-ray absorption analysis. In particular, the iron-nitrogen bond lengths in the porphyrin ring converge to a common value of about 2 Å, except for deoxyMb whose bigger value is due to the doming of the heme. The trends of the Fe-Nε (His93) bond length is found to be consistent with the effect of ligand binding to the iron, with the exception of MbNO, which is explained in terms of the repulsive trans effect. We derive a high resolution description of the relative geometry of the ligands with respect to the heme and quantify the magnitude of the heme doming in the deoxyMb form. Finally, time-dependent density functional theory is used to simulate the pre-edge spectra and is found to be in good agreement with the experiment. The XAS spectra typically exhibit one pre-edge feature which arises from transitions into the unoccupied dσ and dπ - πligand* orbitals. 1s → dπ transitions contribute weakly for MbO2, metMb and deoxyMb. However, despite this strong Fe d contribution these transitions are found to be dominated by the dipole (1s → 4p) moment due to the low symmetry of the heme environment.
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Affiliation(s)
- Frederico A Lima
- École Polytechnique Fédérale de Lausanne, Laboratoire de Spectroscopie Ultrarapide, ISIC, FSB-BSP, CH-1015 Lausanne, CH, Switzerland.
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21
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Lima FA, Bjornsson R, Weyhermüller T, Chandrasekaran P, Glatzel P, Neese F, DeBeer S. High-resolution molybdenum K-edge X-ray absorption spectroscopy analyzed with time-dependent density functional theory. Phys Chem Chem Phys 2014; 15:20911-20. [PMID: 24197060 DOI: 10.1039/c3cp53133c] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
X-ray absorption spectroscopy (XAS) is a widely used experimental technique capable of selectively probing the local structure around an absorbing atomic species in molecules and materials. When applied to heavy elements, however, the quantitative interpretation can be challenging due to the intrinsic spectral broadening arising from the decrease in the core-hole lifetime. In this work we have used high-energy resolution fluorescence detected XAS (HERFD-XAS) to investigate a series of molybdenum complexes. The sharper spectral features obtained by HERFD-XAS measurements enable a clear assignment of the features present in the pre-edge region. Time-dependent density functional theory (TDDFT) has been previously shown to predict K-pre-edge XAS spectra of first row transition metal compounds with a reasonable degree of accuracy. Here we extend this approach to molybdenum K-edge HERFD-XAS and present the necessary calibration. Modern pure and hybrid functionals are utilized and relativistic effects are accounted for using either the Zeroth Order Regular Approximation (ZORA) or the second order Douglas-Kroll-Hess (DKH2) scalar relativistic approximations. We have found that both the predicted energies and intensities are in excellent agreement with experiment, independent of the functional used. The model chosen to account for relativistic effects also has little impact on the calculated spectra. This study provides an important calibration set for future applications of molybdenum HERFD-XAS to complex catalytic systems.
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Affiliation(s)
- Frederico A Lima
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, D- 45470, Mülheim an der Ruhr, Germany.
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22
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Reinhard M, Penfold TJ, Lima FA, Rittmann J, Rittmann-Frank MH, Abela R, Tavernelli I, Rothlisberger U, Milne CJ, Chergui M. Photooxidation and photoaquation of iron hexacyanide in aqueous solution: A picosecond X-ray absorption study. Struct Dyn 2014; 1:024901. [PMID: 26798775 PMCID: PMC4711601 DOI: 10.1063/1.4871751] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2013] [Accepted: 04/07/2014] [Indexed: 05/03/2023]
Abstract
We present a picosecond Fe K-edge absorption study of photoexcited ferrous and ferric hexacyanide in water under 355 and 266 nm excitation. Following 355 nm excitation, the transient spectra for the ferrous and ferric complexes exhibit a red shift of the edge reflecting an increased electron density at the Fe atom. For the former, an enhanced pre-edge transition is also observed. These observations are attributed to the aquated [Fe(CN)5OH2](3-) species, based on quantum chemical calculations which also provide structural parameters. Upon 266 nm excitation of the ferric complex, a transient reminiscent of the aquated species is observed (appearance of a pre-edge feature and red shift of the edge) but it is different from that obtained under 355 nm excitation. This points to a new reaction channel occurring through an intermediate state lying between these two excitation energies. Finally, 266 nm excitation of the ferrous species is dominated by the photooxidation channel with formation of the ferric complex as main photoproduct. However, we observe an additional minor photoproduct, which is identical to the 266 nm generated photoproduct of the ferric species, suggesting that under our experimental conditions, the pump pulse photooxidises the ferrous complex and re-excites the primary ferric photoproduct.
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Affiliation(s)
- M Reinhard
- Ecole Polytechnique Fédérale de Lausanne, Laboratoire de Spectroscopie Ultrarapide , ISIC, FSB, CH-1015 Lausanne, Switzerland
| | | | - F A Lima
- Ecole Polytechnique Fédérale de Lausanne, Laboratoire de Spectroscopie Ultrarapide , ISIC, FSB, CH-1015 Lausanne, Switzerland
| | - J Rittmann
- Ecole Polytechnique Fédérale de Lausanne, Laboratoire de Spectroscopie Ultrarapide , ISIC, FSB, CH-1015 Lausanne, Switzerland
| | - M H Rittmann-Frank
- Ecole Polytechnique Fédérale de Lausanne, Laboratoire de Spectroscopie Ultrarapide , ISIC, FSB, CH-1015 Lausanne, Switzerland
| | - R Abela
- SwissFEL, Paul Scherrer Inst , CH-5232 Villigen, Switzerland
| | - I Tavernelli
- Ecole Polytechnique Fédérale de Lausanne, Laboratoire de Chimie et Biochimie Computationnelles , ISIC, FSB, CH-1015 Lausanne, Switzerland
| | - U Rothlisberger
- Ecole Polytechnique Fédérale de Lausanne, Laboratoire de Chimie et Biochimie Computationnelles , ISIC, FSB, CH-1015 Lausanne, Switzerland
| | | | - M Chergui
- Ecole Polytechnique Fédérale de Lausanne, Laboratoire de Spectroscopie Ultrarapide , ISIC, FSB, CH-1015 Lausanne, Switzerland
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Bjornsson R, Lima FA, Spatzal T, Weyhermüller T, Glatzel P, Bill E, Einsle O, Neese F, DeBeer S. Identification of a spin-coupled Mo(iii) in the nitrogenase iron–molybdenum cofactor. Chem Sci 2014. [DOI: 10.1039/c4sc00337c] [Citation(s) in RCA: 133] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
The molybdenum atom in FeMoco is imperative to the high activity of the enzyme and has been proposed to be Mo(iv). We demonstrate that only Mo(iii) fits Mo HERFD XAS data, the first example of Mo(iii) in biology. Theoretical calculations further reveal an unusual spin-coupled Mo(iii).
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Affiliation(s)
- Ragnar Bjornsson
- Max-Planck-Institut für Chemische Energiekonversion
- 45470 Mülheim an der Ruhr, Germany
| | - Frederico A. Lima
- Max-Planck-Institut für Chemische Energiekonversion
- 45470 Mülheim an der Ruhr, Germany
| | - Thomas Spatzal
- Institute for Biochemistry
- Albert-Ludwigs-Universität Freiburg
- 79104 Freiburg, Germany
| | - Thomas Weyhermüller
- Max-Planck-Institut für Chemische Energiekonversion
- 45470 Mülheim an der Ruhr, Germany
| | - Pieter Glatzel
- European Synchrotron Radiation Facility
- 38043 Grenoble Cedex, France
| | - Eckhard Bill
- Max-Planck-Institut für Chemische Energiekonversion
- 45470 Mülheim an der Ruhr, Germany
| | - Oliver Einsle
- Institute for Biochemistry
- Albert-Ludwigs-Universität Freiburg
- 79104 Freiburg, Germany
| | - Frank Neese
- Max-Planck-Institut für Chemische Energiekonversion
- 45470 Mülheim an der Ruhr, Germany
| | - Serena DeBeer
- Max-Planck-Institut für Chemische Energiekonversion
- 45470 Mülheim an der Ruhr, Germany
- Department of Chemistry and Chemical Biology
- Cornell University
- Ithaca, USA
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Penfold TJ, Karlsson S, Capano G, Lima FA, Rittmann J, Reinhard M, Rittmann-Frank MH, Braem O, Baranoff E, Abela R, Tavernelli I, Rothlisberger U, Milne CJ, Chergui M. Solvent-induced luminescence quenching: static and time-resolved X-ray absorption spectroscopy of a copper(I) phenanthroline complex. J Phys Chem A 2013; 117:4591-601. [PMID: 23617226 DOI: 10.1021/jp403751m] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We present a static and picosecond X-ray absorption study at the Cu K-edge of bis(2,9-dimethyl-1,10-phenanthroline)copper(I) ([Cu(dmp)2](+); dmp = 2,9-dimethyl-1,10-phenanthroline) dissolved in acetonitrile and dichloromethane. The steady-state photoluminescence spectra in dichloromethane and acetonitrile are also presented and show a shift to longer wavelengths for the latter, which points to a stronger stabilization of the excited complex. The fine structure features of the static and transient X-ray spectra allow an unambiguous assignment of the electronic and geometric structure of the molecule in both its ground and excited (3)MLCT states. Importantly, the transient spectra are remarkably similar for both solvents, and the spectral changes can be rationalized using the optimized ground- and excited-state structures of the complex. The proposed assignment of the lifetime shortening of the excited state in donor solvents (acetonitrile) to a metal-centered exciplex is not corroborated here. Molecular dynamics simulations confirm the lack of complexation; however, in both solvents the molecules come close to the metal but undergo rapid exchange with the bulk. The shortening of the lifetime of the title complex and nine additional related complexes can be rationalized by the decrease in the (3)MLCT energy. Deviations from this trend may be explained by means of the effects of the dihedral angle between the ligand planes, the solvent, and the (3)MLCT-(1)MLCT energy gap.
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Affiliation(s)
- T J Penfold
- Laboratoire De Spectroscopie Ultrarapide, École Polytechnique Fédérale De Lausanne, ISIC, FSB-BSP, CH-1015 Lausanne, Switzerland
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Milne CJ, Van der Veen RM, Pham VT, Lima FA, Rittmann-Frank H, Reinhard M, van Mourik F, Karlsson S, Penfold TJ, Chergui M. Ultrafast X-ray absorption studies of the structural dynamics of molecular and biological systems in solution. Chimia (Aarau) 2011; 65:303-7. [PMID: 21744680 DOI: 10.2533/chimia.2011.303] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
We review our recent studies of excited state structures and dynamics of chemical and biological systems with pico- and femtosecond X-ray absorption spectroscopy in the liquid phase.
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Affiliation(s)
- Christopher J Milne
- Ecole Polytechnique Féderale de Lausanne, Laboratory of Ultrafast Spectroscopy, EPFL-SB-ISIC-LSU, Station 6, CH-1015 Lausanne
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26
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Lima FA, Milne CJ, Amarasinghe DCV, Rittmann-Frank MH, van der Veen RM, Reinhard M, Pham VT, Karlsson S, Johnson SL, Grolimund D, Borca C, Huthwelker T, Janousch M, van Mourik F, Abela R, Chergui M. A high-repetition rate scheme for synchrotron-based picosecond laser pump/x-ray probe experiments on chemical and biological systems in solution. Rev Sci Instrum 2011; 82:063111. [PMID: 21721678 DOI: 10.1063/1.3600616] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
We present the extension of time-resolved optical pump/x-ray absorption spectroscopy (XAS) probe experiments towards data collection at MHz repetition rates. The use of a high-power picosecond laser operating at an integer fraction of the repetition rate of the storage ring allows exploitation of up to two orders of magnitude more x-ray photons than in previous schemes based on the use of kHz lasers. Consequently, we demonstrate an order of magnitude increase in the signal-to-noise of time-resolved XAS of molecular systems in solution. This makes it possible to investigate highly dilute samples at concentrations approaching physiological conditions for biological systems. The simplicity and compactness of the scheme allows for straightforward implementation at any synchrotron beamline and for a wide range of x-ray probe techniques, such as time-resolved diffraction or x-ray emission studies.
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Affiliation(s)
- Frederico A Lima
- Laboratoire de Spectroscopie Ultrarapide, Ecole Polytechnique Fédérale de Lausanne, ISIC, FSB, 1015 Lausanne, Switzerland
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van der Veen RM, Kas JJ, Milne CJ, Pham VT, Nahhas AE, Lima FA, Vithanage DA, Rehr JJ, Abela R, Chergui M. L-edge XANES analysis of photoexcited metal complexes in solution. Phys Chem Chem Phys 2010; 12:5551-61. [DOI: 10.1039/b927033g] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Veen RMVD, Bressler C, Milne CJ, Pham VT, Nahhas AE, Lima FA, Gawelda W, Borca CN, Abela R, Chergui M. Retrieving photochemically active structures by time-resolved EXAFS spectroscopy. ACTA ACUST UNITED AC 2009. [DOI: 10.1088/1742-6596/190/1/012054] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Lima FA, Szejnfeld VL, Baracat EC, Atra E, Lima GR. [Effect of tamoxifen on the bone mass]. Rev Assoc Med Bras (1992) 1992; 38:231-3. [PMID: 1340384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Affiliation(s)
- F A Lima
- Disciplina de Ginecologia da Escola Paulista de Medicina, São Paulo, SP
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