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N'Diaye A, Bordage A, Nataf L, Baudelet F, Rivière E, Bleuzen A. Interplay between transition-metal K-edge XMCD, slight structural distortions and magnetism in a series of trimetallic (Co xNi (1-x)) 4[Fe(CN) 6] 3/8 Prussian blue analogues. Phys Chem Chem Phys 2024; 26:15576-15586. [PMID: 38757724 DOI: 10.1039/d3cp04749k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
The magnetic properties of a series of trimetallic (Co,Ni)Fe Prussian blue analogues (PBAs) were investigated by SQUID magnetometry and X-ray magnetic circular dichroism (XMCD) at the three transition metal (TM) K-edges. In turn, the PBA trimetallic series was used as a tool in order to better understand the information contained in TM K-edge XMCD and particularly the chemical nature of the probed species (extended sub-lattice or localized entities). The results show that the magnetic behavior of the compounds is dictated by competing exchange interactions between the Co-Fe and Ni-Fe pairs, without spin frustration. They also show that XMCD at the TM K-edge is a local atomic probe of the element at the N side of the cyanide bridge and a local probe of the absorbing atom and its first magnetic neighbors on the C side of the bridge. At last, XMCD at the TM K-edge turns out to be highly sensitive to very small structural distortions.
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Affiliation(s)
- Adama N'Diaye
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, 91405 Orsay, France.
| | - Amélie Bordage
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, 91405 Orsay, France.
| | - Lucie Nataf
- Synchrotron SOLEIL, L'Orme des Merisiers, St Aubin, BP 48, 91192 Gif sur Yvette, France
| | - François Baudelet
- Synchrotron SOLEIL, L'Orme des Merisiers, St Aubin, BP 48, 91192 Gif sur Yvette, France
| | - Eric Rivière
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, 91405 Orsay, France.
| | - Anne Bleuzen
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, 91405 Orsay, France.
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Retegan M, Jafri SF, Curti L, Lisnard L, Otero E, Rivière E, Haverkort MW, Bleuzen A, Sainctavit P, Arrio MA. Orbital Magnetic Moment and Single-Ion Magnetic Anisotropy of the S = 1/2 K 3[Fe(CN) 6] Compound: A Case Where the Orbital Magnetic Moment Dominates the Spin Magnetic Moment. Inorg Chem 2023; 62:18864-18877. [PMID: 37942765 DOI: 10.1021/acs.inorgchem.3c02158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2023]
Abstract
The potassium hexacyanoferrate(III), K3[FeIII(CN)6], is known for its exceptional magnetic anisotropy among the 3d transition metal series. The Fe(III) ions are in the S = 1/2 low spin state imposed by the strong crystal field of the cyanido ligands. A large orbital magnetic moment is expected from previous publications. In the present work, X-ray magnetic circular dichroism was recorded for a powder sample, allowing direct measurement of the Fe(III) orbital magnetic moment. A combination of molecular multiconfigurational ab initio and atomic ligand field multiplets calculations provides the spin and orbital magnetic moments for the [FeIII(CN)6]3- isolated cluster, the crystallographic unit cell, and the powder sample. The calculations of the angular dependencies of the spin and orbital magnetic moments with the external magnetic induction direction reveal easy magnetization axes for each S = 1/2 molecular entity and the crystal. It also shows that the orbital magnetic moment dominates the spin magnetic moment for all directions. Our measurements confirm that the orbital magnetic moment contributes to 60% of the total magnetization for the powder, which is in excellent agreement with our theoretical predictions. An orbital magnetic moment greater than the spin magnetic moment is exceptional for 3d transition metal ions. The impact of crystal field strength and distortion, π back-bonding, spin-orbit coupling, and external magnetic induction was analyzed, leading to a deeper understanding of the spin and orbital magnetic anisotropies.
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Affiliation(s)
- Marius Retegan
- European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble, France
| | - Sadaf Fatima Jafri
- CNRS, Sorbonne Université, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, CNRS/SU/IRD/MNHN, 75252 Paris Cedex 05, France
- Department of Physics, University of Karachi, 75270 Karachi, Pakistan
| | - Leonardo Curti
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, FR2769, 75252 Paris Cedex 05, France
| | - Laurent Lisnard
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, FR2769, 75252 Paris Cedex 05, France
| | - Edwige Otero
- Synchrotron SOLEIL, L'Orme des Merisiers, F-91192 Saint-Aubin, France
| | - Eric Rivière
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, ICMMO, 91405 Orsay Cedex, France
| | - Maurits W Haverkort
- Institute for Theoretical Physics, Heidelberg University, Philosophenweg 19, 69120 Heidelberg, Germany
| | - Anne Bleuzen
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, ICMMO, 91405 Orsay Cedex, France
| | - Philippe Sainctavit
- CNRS, Sorbonne Université, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, CNRS/SU/IRD/MNHN, 75252 Paris Cedex 05, France
- Synchrotron SOLEIL, L'Orme des Merisiers, F-91192 Saint-Aubin, France
| | - Marie-Anne Arrio
- CNRS, Sorbonne Université, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, CNRS/SU/IRD/MNHN, 75252 Paris Cedex 05, France
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N’Diaye A, Bordage A, Nataf L, Baudelet F, Rivière E, Bleuzen A. Interplay between Transition-Metal K-edge XMCD and Magnetism in Prussian Blue Analogs. ACS OMEGA 2022; 7:36366-36378. [PMID: 36278067 PMCID: PMC9583310 DOI: 10.1021/acsomega.2c04049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 07/25/2022] [Indexed: 06/16/2023]
Abstract
To disentangle the information contained in transition-metal K-edge X-ray magnetic circular dichroism (XMCD), two series of Prussian blue analogs (PBAs) were investigated as model compounds. The number of 3d electrons and the magnetic orbitals have been varied on both sites of the bimetallic cyanide polymer by combining with the hexacyanoferrate or the hexacyanochromate entities' various divalent metal ions A2+ (Mn2+, Fe2+, Co2+, Ni2+, and Cu2+). These PBA were studied by Fe and Cr X-ray absorption spectroscopy and XMCD. The results, compared to those obtained at the A K-edges in a previous work, show that transition-metal K-edge XMCD is very sensitive to orbital symmetry and can therefore give valuable information on the local structure of the magnetic centers. Expressions of the intensity of the main 1s → 4p contribution to the signal are proposed for all K-edges and all compounds. The results pave the way toward a new tool for molecular materials able to give access to valuable information on the local orientation of the magnetic moments or to better understand the role of 4p orbitals involved in their magnetic properties.
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Affiliation(s)
- Adama N’Diaye
- Institut
de Chimie Moléculaire et des Matériaux d’Orsay,
CNRS, Université Paris-Saclay, 91405Orsay, France
| | - Amélie Bordage
- Institut
de Chimie Moléculaire et des Matériaux d’Orsay,
CNRS, Université Paris-Saclay, 91405Orsay, France
| | - Lucie Nataf
- Synchrotron
SOLEIL, L’Orme des Merisiers, St Aubin, BP 48, F-91192Gif sur Yvette, France
| | - François Baudelet
- Synchrotron
SOLEIL, L’Orme des Merisiers, St Aubin, BP 48, F-91192Gif sur Yvette, France
| | - Eric Rivière
- Institut
de Chimie Moléculaire et des Matériaux d’Orsay,
CNRS, Université Paris-Saclay, 91405Orsay, France
| | - Anne Bleuzen
- Institut
de Chimie Moléculaire et des Matériaux d’Orsay,
CNRS, Université Paris-Saclay, 91405Orsay, France
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