Large Orbital Magnetic Moment Measured in the [TpFe(III)(CN)3](-) Precursor of Photomagnetic Molecular Prussian Blue Analogues.

Autor: Jafri SF; Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, CNRS, UPMC, IRD, MNHN , 75252 Paris Cedex 05, France., Koumousi ES; CNRS, ICMCB, UPR 9048 , F-33600 Pessac, France.; Univ. Bordeaux, ICMCB, UPR 9048 , F-33600 Pessac, France.; CNRS, CRPP, UPR 8641 , F-33600 Pessac, France.; Univ. Bordeaux, CRPP, UPR 8641 , F-33600 Pessac, France., Sainctavit P; Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, CNRS, UPMC, IRD, MNHN , 75252 Paris Cedex 05, France.; Synchrotron SOLEIL , L'Orme des Merisiers, 91190 Saint-Aubin, France., Juhin A; Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, CNRS, UPMC, IRD, MNHN , 75252 Paris Cedex 05, France., Schuler V; Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, CNRS, UPMC, IRD, MNHN , 75252 Paris Cedex 05, France., Bun U O; Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, CNRS, UPMC, IRD, MNHN , 75252 Paris Cedex 05, France., Mitcov D; CNRS, CRPP, UPR 8641 , F-33600 Pessac, France.; Univ. Bordeaux, CRPP, UPR 8641 , F-33600 Pessac, France., Dechambenoit P; CNRS, CRPP, UPR 8641 , F-33600 Pessac, France.; Univ. Bordeaux, CRPP, UPR 8641 , F-33600 Pessac, France., Mathonière C; CNRS, ICMCB, UPR 9048 , F-33600 Pessac, France.; Univ. Bordeaux, ICMCB, UPR 9048 , F-33600 Pessac, France., Clérac R; CNRS, CRPP, UPR 8641 , F-33600 Pessac, France.; Univ. Bordeaux, CRPP, UPR 8641 , F-33600 Pessac, France., Otero E; Synchrotron SOLEIL , L'Orme des Merisiers, 91190 Saint-Aubin, France., Ohresser P; Synchrotron SOLEIL , L'Orme des Merisiers, 91190 Saint-Aubin, France., Cartier Dit Moulin C; CNRS, UMR 8232, Institut Parisien de Chimie Moléculaire , F-75005 Paris, France.; Sorbonne Universités, UPMC Univ. Paris 06, UMR 8232, IPCM , F-75005 Paris, France., Arrio MA; Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, CNRS, UPMC, IRD, MNHN , 75252 Paris Cedex 05, France.
Jazyk: angličtina
Zdroj: Inorganic chemistry [Inorg Chem] 2016 Jul 18; Vol. 55 (14), pp. 6980-7. Date of Electronic Publication: 2016 Jul 06.
DOI: 10.1021/acs.inorgchem.6b00664
Abstrakt: Photomagnetism in three-dimensional Co/Fe Prussian blue analogues is a complex phenomenon, whose detailed mechanism is not yet fully understood. Recently, researchers have been able to prepare molecular fragments of these networks using a building block synthetic approach from mononuclear precursors. The main objective in this strategy is to isolate the smallest units that show an intramolecular electron transfer to have a better understanding of the electronic processes. A prior requirement to the development of this kind of system is to understand to what extent electronic and magnetic properties are inherited from the corresponding precursors. In this work, we investigate the electronic and magnetic properties of the FeTp precursor (N(C4H9)4)[TpFe(III)(CN)3], (Tp being tris-pyrazolyl borate) of a recently reported binuclear cyanido-bridged Fe/Co complex. X-ray absorption spectroscopy and X-ray magnetic circular dichroism measurements at the Fe L2,3 edges (2p → 3d) supported by ligand field multiplet calculations have allowed to determine the spin and orbit magnetic moments. Inaccuracy of the spin sum rule in the case of low-spin Fe(III) ion was demonstrated. An exceptionally large value of the orbital magnetic moment is found (0.9 μB at T = 2 K and B = 6.5 T) that is likely to play an important role in the magnetic and photomagnetic properties of molecular Fe/Co Prussian blue analogues.
Databáze: MEDLINE
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