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  Robust magnetic anisotropy of a monolayer of hexacoordinate Fe(II) complexes assembled on Cu(111)

Kelai, M., Cahier, B., Atanasov, M., Neese, F., Tong, Y., Zhang, L., et al. (2021). Robust magnetic anisotropy of a monolayer of hexacoordinate Fe(II) complexes assembled on Cu(111). Inorganic Chemistry Frontiers, 8(9), 2395-2404. doi:10.1039/D1QI00085C.

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Kelai, Massine1, Author
Cahier, Benjamin2, 3, Author           
Atanasov, Mihail4, 5, Author           
Neese, Frank6, Author           
Tong, Yongfeng1, Author
Zhang, Luqiong2, 5, Author
Bellec, Amandine1, Author
Iasco, Olga2, Author
Rivière, Eric2, Author
Guillot, Régis2, Author
Chacon, Cyril1, Author
Girard, Yann1, Author
Lagoute, Jérome1, Author
Rousset, Sylvie1, Author
Repain, Vincent1, Author
Otero, Edwige7, Author
Arrio, Marie-Anne7, 8, Author
Sainctavit, Philippe7, 8, Author
Barra, Anne-Laure9, Author
Boillot, Marie-Laure2, Author
Mallah, Talal2, Author more..
Affiliations:
1Université de Paris, Laboratoire Matériaux et Phénomènes Quantiques, CNRS, Paris, France, ou_persistent22              
2Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, UMR 8182, 91405 Orsay Cedex, France , ou_persistent22              
3Research Group Manganas, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_2541709              
4Research Group Atanasov, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_2541704              
5Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Akad.Georgi Bontchev street, Bl.11, 1113 Sofia, Bulgaria, ou_persistent22              
6Research Department Neese, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_2541710              
7Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin , 91192 Gif sur Yvette, France, ou_persistent22              
8Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, CNRS UMR7590, Sorbonne Université, MNHN, 75252 Paris Cedex 5, France, ou_persistent22              
9Laboratoire National des Champs Magnétiques Intenses, UPR CNRS 3228, Univ. Grenoble Alpes, 25, avenue des Martyrs, B.P. 166, 38042 Grenoble Cedex 9, France , ou_persistent22              

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 Abstract: The measurement of the magnetic anisotropy of [Fe{(3,5-(CH3)2Pz)3BH}2], where Pz = pyrazole, in its high spin state (S = 2) by X-ray Magnetic Circular Dichroism (XMCD) spectroscopy when assembled as an organized monolayer on Cu(111) shows the presence of a hard axis of magnetization (positive axial zero-field splitting – ZFS – parameter D). Combining magnetization and multifrequency electron paramagnetic resonance spectroscopy on a reference compound, [Fe{(3-(Ph)Pz)3BH}2], of the same family and ab initio wave function based theoretical calculations, we demonstrate that the magnetic anisotropy of the assembled molecules is not affected when they are present at the substrate/vacuum interface. Comparing our results with those of a reported complex having an almost identical FeN6 coordination sphere but an easy axis of magnetization (corresponding to a negative D value), we show that the nature of the magnetic anisotropy (easy/hard axis) is governed by the torsion angle (Ψ) defined by the relative orientation of the pyrazole five-membered rings to the pseudo three-fold axis of the molecules. The rigidity of the (Pz)3BH tridentate ligands, where the three pyrazole moieties are held by the BH group, allows only very slight changes in the torsion angle even when the molecules are in a dissymmetric environment such as an interface. This is the origin of the robust magnetic anisotropy of this family of compounds.

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Language(s): eng - English
 Dates: 2021-01-212021-02-262021-03-052021-05-07
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1039/D1QI00085C
 Degree: -

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Title: Inorganic Chemistry Frontiers
  Abbreviation : Inorg. Chem. Front.
Source Genre: Journal
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Publ. Info: Cambridge, England : RSC
Pages: - Volume / Issue: 8 (9) Sequence Number: - Start / End Page: 2395 - 2404 Identifier: ISSN: 2052-1553
CoNE: https://pure.mpg.de/cone/journals/resource/2052-1553