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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Wilk-Kozubek, Magdalena
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (4/4 displayed)
- 2019Alternative to the Popular Imidazolium Ionic Liquidscitations
- 2019Luminescence properties of a family of lanthanide metal-organic frameworkscitations
- 2019Ionothermal Synthesis, Structures, and Magnetism of Three New Open Framework Iron Halide-Phosphatescitations
- 2017Synthesis, structural characterization and computational studies ofcatena-poly[chlorido[μ3-(pyridin-1-ium-3-yl)phosphonato-κ3O:O′:O′′]zinc(II)]
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article
Ionothermal Synthesis, Structures, and Magnetism of Three New Open Framework Iron Halide-Phosphates
Abstract
<p>A set of different open framework iron phosphates have been synthesized ionothermally using a task-specific ionic liquid, 1-butyl-4-methylpyridinium hexafluorophosphate, that acts in the synthesis as the reaction medium and mineralizer: (NH<sub>4</sub>)<sub>2</sub>Fe<sub>2</sub>(HPO<sub>4</sub>)(PO<sub>4</sub>)Cl<sub>2</sub>F (1) and K<sub>2</sub>Fe<sub>2</sub>(HPO<sub>4</sub>)(PO<sub>4</sub>)Cl<sub>2</sub>F (2) exhibit similar composition and closely related structural features. Both structures consist of {Fe<sub>2</sub>(HPO<sub>4</sub>)(PO<sub>4</sub>)Cl<sub>2</sub>F}<sup>2-</sup> macroanions and charge balancing ammonium or potassium cations. Their open framework structure contains layers and chains of corner-linked {Fe(1)O<sub>2</sub>Cl<sub>4</sub>} and {Fe(2)F<sub>2</sub>O<sub>4</sub>} octahedra, respectively, interconnected by PO<sub>4</sub> tetrahedra forming 10-ring channels. KFe(PO<sub>3</sub>F)F<sub>2</sub> (3) is built up by {Fe[(PO<sub>3</sub>F)<sub>4/3</sub>F<sub>2/2</sub>]}{Fe(PO<sub>3</sub>F)<sub>2/3</sub>F<sub>2/2</sub>F<sub>2</sub>} layers separated by K<sup>+</sup> cations. Chains of alternating {FeF<sub>2</sub>O<sub>4</sub>} and {FeO<sub>2</sub>F<sub>4</sub>} octahedra, which are linear for 1 but undulated for 2, are linked to each other via corner-sharing {PO<sub>3</sub>F} tetrahedra with the fluorine pointing into the interlayer space. The compounds were characterized by means of single crystal and powder X-ray diffraction, infrared spectroscopy, and magnetic measurements. 1 reveals a strong ground state spin anisotropy with a spin 5/2 state and a magnetic moment of 5.3 μ<sub>B</sub>/Fe<sup>3+</sup>. Specific heat and magnetic data unveil three magnetic transitions at 95, 50, and 3.6 K. Compound 2 has a very similar crystal structure as compared to 1 but exhibits a different magnetic behavior: a slightly lower magnetic moment of 4.7 μ<sub>B</sub>/Fe<sup>3+</sup> and a magnetic transition to a canted antiferromagnetic state below 90 K. Compound 3 exhibits typical paramagnetic behavior close to room-temperature (5.71 μ<sub>B</sub>/Fe<sup>3+</sup>). There are no clear indications for a phase transition down to 2 K despite strong antiferromagnetic spin-spin interactions; only a magnetic anomaly appears at 50 K in the zero-field cooled data.</p>