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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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Timco, Grigore A.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2024Two‐ and Three‐Spin Hybrid Inorganic‐Organic [2]Rotaxanes Containing Metallated Salen Groups
- 2020Heterometallic 3d-4f complexes as air-stable molecular pre-cursors in low temperature syntheses of stoichiometric rare-earth orthoferrite powderscitations
- 2018The synthesis of a monodisperse quaternary ferrite (FeCoCrO4) from the hot injection thermolysis of the single source precursor [CrCoFeO(O2C: TBu)6(HO2CtBu)3]citations
- 2018The synthesis of a monodisperse quaternary ferrite (FeCoCrO 4 ) from the hot injection thermolysis of the single source precursor [CrCoFeO(O 2 C : T Bu) 6 (HO 2 C t Bu) 3 ]citations
- 2017Portraying entanglement between molecular qubits with four-dimensional inelastic neutron scatteringcitations
- 2014A one-pot synthesis of monodispersed iron cobalt oxide and iron manganese oxide nanoparticles from bimetallic pivalate clusterscitations
- 2014Metal distribution and disorder in the crystal structure of [NH2Et2][Cr7MF8(tBuCO2)16] wheel molecules for M = Mn, Fe, Co, Ni, Cu, Zn and Cdcitations
- 2013Pressure versus temperature effects on intramolecular electron transfer in mixed-valence complexescitations
- 2013Synthesis of monodispersed magnetite nanoparticles from iron pivalate clusterscitations
- 2009Functional chromium wheel-based hybrid organic - Inorganic materials for dielectric applicationscitations
- 2009Experimental charge density in an oxidized trinuclear iron complex using 15 K synchrotron and 100 K conventional single-crystal X-ray diffractioncitations
- 2007Isolated heterometallic Cr7Ni rings grafted on Au(111) surfacecitations
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article
Heterometallic 3d-4f complexes as air-stable molecular pre-cursors in low temperature syntheses of stoichiometric rare-earth orthoferrite powders
Abstract
Four 3d-4f hetero-polymetallic complexes [Fe<sub>2</sub>Ln<sub>2</sub>((OCH<sub>2</sub>)<sub>3</sub>CR)<sub>2</sub>(O<sub>2</sub>C<sup>t</sup>Bu)<sub>6</sub>(H<sub>2</sub>O)<sub>4</sub>] (where Ln = La (<b>1</b> and <b>2</b>) and Gd (<b>3</b> and <b>4</b>); and R = Me (<b>1</b> and <b>3</b>) and Et (<b>2 </b>and <b>4</b>)) are synthesised and analysed using elemental analysis, Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA) and SQUID magnetometry. Crystal structures are obtained for both methyl derivatives and show that the complexes are isostructural and adopt a defective dicubane topology. The four heavy metals are connected with two alkoxide bridges. These four precursors are used as single-source precursors to prepare rare-earth orthoferrite pervoskites of the form LnFeO<sub>3</sub>. Thermal decomposition in a ceramic boat in a tube furnace gives orthorhombic LnFeO<sub>3</sub> powders using optimised temperatures and decomposition times: LnFeO<sub>3</sub> formed at 650 ℃ over 30 min, whereas GdFeO3 formed at 750 ℃ over 18 h. These materials are structurally characterised using powder X-ray diffraction, Raman spectroscopy, scanning electron microscopy, energy-dispersive X-ray map spectros-copy, and SQUID magnetometry. EDX spectroscopy mapping reveals a homogenous spatial distribution of elements for all four materials consistent with LnFeO<sub>3</sub>. Magnetic measurements on complexes <b>1</b>-<b>4</b> confirms the presence of weak antiferro-magnetic coupling between the central Fe(III) ions of the clusters and negligible ferromagnetic interaction with peripheral Gd(III) ions in <b>3</b> and <b>4</b>. Zero field cooled (ZFC) and field-cooled (FC) measurements of magnetization of LnFeO<sub>3</sub> and GdFeO<sub>3</sub> in the solid state suggests that both materials are ferromagnetic, and both materials show open magnetic hysteresis loops at 5 K and 300 K, with <i>M</i><sub>sat</sub> higher than previously reported for these as nanomaterials. We conclude that this is a new and facile low temperature route to these important magnetic materials that is potentially universal limited only by what metals can be programmed into the precursor complexes.