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Ugalino R, Yamazoe K, Miyawaki J, Kiuchi H, Kurahashi N, Kosegawa Y, Harada Y. The role of carboxylate ligand orbitals in the breathing dynamics of a metal-organic framework by resonant X-ray emission spectroscopy. JOURNAL OF SYNCHROTRON RADIATION 2024; 31:217-221. [PMID: 38363223 PMCID: PMC10914173 DOI: 10.1107/s1600577524000584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Accepted: 01/16/2024] [Indexed: 02/17/2024]
Abstract
Metal-organic frameworks (MOFs) exhibit structural flexibility induced by temperature and guest adsorption, as demonstrated in the structural breathing transition in certain MOFs between narrow-pore and large-pore phases. Soft modes were suggested to entropically drive such pore breathing through enhanced vibrational dynamics at high temperatures. In this work, oxygen K-edge resonant X-ray emission spectroscopy of the MIL-53(Al) MOF was performed to selectively probe the electronic perturbation accompanying pore breathing dynamics at the ligand carboxylate site for metal-ligand interaction. It was observed that the temperature-induced vibrational dynamics involves switching occupancy between antisymmetric and symmetric configurations of the carboxylate oxygen lone pair orbitals, through which electron density around carboxylate oxygen sites is redistributed and metal-ligand interactions are tuned. In turn, water adsorption involves an additional perturbation of π orbitals not observed in the structural change solely induced by temperature.
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Affiliation(s)
- Ralph Ugalino
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - Kosuke Yamazoe
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - Jun Miyawaki
- Institute for Advanced Synchrotron Light Source, National Institutes for Quantum and Radiological Science and Technology (QST), Sendai, Miyagi 980-8579, Japan
| | - Hisao Kiuchi
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - Naoya Kurahashi
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - Yuka Kosegawa
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - Yoshihisa Harada
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
- Synchrotron Radiation Collaborative Research Organization, The University of Tokyo, Sendai, Miyagi 980-8572, Japan
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Savchenko V, Eckert S, Fondell M, Mitzner R, Vaz da Cruz V, Föhlisch A. Electronic structure, bonding and stability of fumarate, maleate, and succinate dianions from X-ray spectroscopy. Phys Chem Chem Phys 2024; 26:2304-2311. [PMID: 38165713 DOI: 10.1039/d3cp04348g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2024]
Abstract
The electronic structure of the fumarate, maleate, and succinate dianions in the context of their stability is determined in a joint experimental and computational study with X-ray absorption spectroscopy and resonant inelastic X-ray scattering at the O K-edge. The study reveals differences in the electronic states and molecular orbitals of the three molecules. In particular, maleate has a non-degenerate oxygen core-orbital with an energy difference of approximately 0.15 eV, visible in a two peak structure in XAS. Polarization-dependent RIXS provides information on the orientation of the occupied valence molecular orbitals with respect to the carboxylate group plane and shows a gradually increasing energy gap between the HOMO and excited π* LUMO from fumarate to maleate to succinate. We also demonstrate the energy excitation dependence of the RIXS spectra of maleate, with the total inelastic RIXS profile shifting towards higher energy loss as the detuning is increased from negative to positive values. Our findings show that maleate is less stable than fumarate and succinate due to the presence of electronic density on its HOMO orbital on the CC bond between carboxylate groups, which can lead to weaker bonding of maleate with molecules or ions.
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Affiliation(s)
- Viktoriia Savchenko
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institute for Methods and Instrumentation for Synchrotron Radiation Research, 12489 Berlin, Germany.
| | - Sebastian Eckert
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institute for Methods and Instrumentation for Synchrotron Radiation Research, 12489 Berlin, Germany.
| | - Mattis Fondell
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institute for Methods and Instrumentation for Synchrotron Radiation Research, 12489 Berlin, Germany.
| | - Rolf Mitzner
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institute for Methods and Instrumentation for Synchrotron Radiation Research, 12489 Berlin, Germany.
| | - Vincius Vaz da Cruz
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institute for Methods and Instrumentation for Synchrotron Radiation Research, 12489 Berlin, Germany.
| | - Alexander Föhlisch
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institute for Methods and Instrumentation for Synchrotron Radiation Research, 12489 Berlin, Germany.
- Institut für Physik und Astronomie, Universität Potsdam, 14476 Potsdam, Germany
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Ablyasova O, Guo M, Zamudio-Bayer V, Kubin M, Gitzinger T, da Silva Santos M, Flach M, Timm M, Lundberg M, Lau JT, Hirsch K. Electronic Structure of the Complete Series of Gas-Phase Manganese Acetylacetonates by X-ray Absorption Spectroscopy. J Phys Chem A 2023; 127:7121-7131. [PMID: 37590497 PMCID: PMC10476195 DOI: 10.1021/acs.jpca.3c02794] [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: 04/28/2023] [Revised: 07/28/2023] [Indexed: 08/19/2023]
Abstract
Metal centers in transition metal-ligand complexes occur in a variety of oxidation states causing their redox activity and therefore making them relevant for applications in physics and chemistry. The electronic state of these complexes can be studied by X-ray absorption spectroscopy, which is, however, due to the complex spectral signature not always straightforward. Here, we study the electronic structure of gas-phase cationic manganese acetylacetonate complexes Mn(acac)1-3+ using X-ray absorption spectroscopy at the metal center and ligand constituents. The spectra are well reproduced by multiconfigurational wave function theory, time-dependent density functional theory as well as parameterized crystal field and charge transfer multiplet simulations. This enables us to get detailed insights into the electronic structure of ground-state Mn(acac)1-3+ and extract empirical parameters such as crystal field strength and exchange coupling from X-ray excitation at both the metal and ligand sites. By comparison to X-ray absorption spectra of neutral, solvated Mn(acac)2,3 complexes, we also show that the effect of coordination on the L3 excitation energy, routinely used to identify oxidation states, can contribute about 40-50% to the observed shift, which for the current study is 1.9 eV per oxidation state.
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Affiliation(s)
- Olesya
S. Ablyasova
- Physikalisches
Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
- Abteilung
für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum
Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
| | - Meiyuan Guo
- SSRL,
SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
- Department
of Chemistry-Ångström Laboratory, Uppsala University, SE-75120 Uppsala, Sweden
| | - Vicente Zamudio-Bayer
- Abteilung
für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum
Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
| | - Markus Kubin
- Abteilung
für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum
Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
| | - Tim Gitzinger
- Physikalisches
Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
- Abteilung
für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum
Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
| | - Mayara da Silva Santos
- Physikalisches
Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
- Abteilung
für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum
Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
| | - Max Flach
- Physikalisches
Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
- 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
| | - Marcus Lundberg
- Department
of Chemistry-Ångström Laboratory, Uppsala University, SE-75120 Uppsala, Sweden
| | - J. Tobias Lau
- Physikalisches
Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
- Abteilung
für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum
Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
| | - Konstantin Hirsch
- Abteilung
für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum
Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
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