Coexistence of metamagnetism and slow relaxation of magnetization in ammonium hexafluoridorhenate

Louis–Jean, James; Balasekaran, Samundeeswari Mariappan; Lawler, Keith V.; Sanchis-Perucho, Adrián; Martı́nez-Lillo, José; Smith, Dean; Forster, Paul M.; Salamat, Ashkan; Poineau, Frédéric

doi:10.1039/d0ra10325j

Cited by 7 publications

(2 citation statements)

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“…Bifluoride salts have been exploited as fluorinating agents due to their decomposition yielding HF (g) , and the fluorination of actinide and transition metal materials with NH 4 HF 2 (ABF) has been successfully demonstrated through solid-state melt reactions. − …”

Section: Resultsmentioning

confidence: 99%

Synthesis and Morphological Control of UO₂F₂Particulates

2023

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Uranium-based microspheres are of interest due to their potential applications as targets for medical isotopes production, as fuel for nuclear reactors, and as standardized materials for nuclear forensics. Here, for the first time, UO2F2 microspheres (1–2 μm) have been prepared from the reaction between UO3 microspheres and AgHF2 in an autoclave. In this preparation, a new fluorination method has been applied, and HF(g)produced in situ from the thermal decomposition of AgHF2 and NH4HF2was used as the fluorinating agent. The microspheres were characterized by powder X-ray diffraction (PXRD) and scanning electron microscopy (SEM). Diffraction results indicated that the reaction performed with AgHF2 at 200 °C led to anhydrous UO2F2 microspheres, while at 150 °C, hydrated UO2F2 microspheres were obtained. Meanwhile, NH4HF2 led to the formation of contaminated products as driven by the formation of volatile species.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Morphological Control of UO₂F₂Particulates

2023

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“…The mononuclear complexes based on halides of Re(IV) ion have been investigated during decades and are characterized by large values of magnetic anisotropy and significant intermolecular magnetic exchange [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Indeed, these compounds can display relatively strong dipolar exchange through Re-X•••X-Re type contacts (X = halogen), which can result in a magnetic order as, for instance, metamagnetism or spin canting [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Solvent on the Crystallographic and Magnetic Properties of rhenium(IV) Complexes Based on 2,2′-Bipyrimidine Ligand

Sanchis-Perucho¹,

Orts-Arroyo²,

Moliner³

et al. 2023

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Two solvated rhenium(IV) complexes with formula [ReCl4(bpym)]·MeCN (1) and [ReCl4(bpym)]·CH3COOH·H2O (2) [bpym = 2,2'-bipyrimidine] have been prepared and characterized by means of Fourier transform infrared spectroscopy (FT–IR), scanning electron microscopy and energy dispersive X-ray analysis (SEM–EDX), single-crystal X-ray diffraction (XRD) and SQUID magnetometer. 1 and 2 crystallize in the monoclinic system with space groups P21/n and P21/c, respectively. In both compounds, the Re(IV) ion is six-coordinate and bound to four chloride ions and two nitrogen atoms of a 2,2’-bipyrimidine molecule forming a distorted octahedral geometry around the metal ion. In the crystal packing of 1 and 2, intermolecular halogen⋯halogen and π⋯halogen type interactions are present. Hydrogen bonds take place only in the crystal structure of 2. Both compounds exhibit an akin crystal framework based on halogen bonds. Variable-temperature dc magnetic susceptibility measurements performed on microcrystalline samples of 1 and 2 show a similar magnetic behavior for both compounds, with antiferromagnetic exchange between the Re(IV) ions connected mainly through intermolecular Re-Cl···Cl-Re interactions.

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From ammonium Hexahalorhenates(IV) to nanocrystalline rhenium metal: A combined thermal, diffraction and microscopic analysis

Louis–Jean

George

Poineau

2022

International Journal of Refractory Metals and Hard Materials

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Coexistence of metamagnetism and slow relaxation of magnetization in ammonium hexafluoridorhenate

Abstract: Unusual magnetic behaviour of 5d metal ions as studied in (NH4)2[Re(IV)F6].

Cited by 7 publications

References 56 publications

Synthesis and Morphological Control of UO₂F₂Particulates

Synthesis and Morphological Control of UO₂F₂Particulates

Effect of the Solvent on the Crystallographic and Magnetic Properties of rhenium(IV) Complexes Based on 2,2′-Bipyrimidine Ligand

From ammonium Hexahalorhenates(IV) to nanocrystalline rhenium metal: A combined thermal, diffraction and microscopic analysis

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Coexistence of metamagnetism and slow relaxation of magnetization in ammonium hexafluoridorhenate

Abstract: Unusual magnetic behaviour of 5d metal ions as studied in (NH4)2[Re(IV)F6].

Cited by 7 publications

References 56 publications

Synthesis and Morphological Control of UO2F2Particulates

Synthesis and Morphological Control of UO2F2Particulates

Effect of the Solvent on the Crystallographic and Magnetic Properties of rhenium(IV) Complexes Based on 2,2′-Bipyrimidine Ligand

From ammonium Hexahalorhenates(IV) to nanocrystalline rhenium metal: A combined thermal, diffraction and microscopic analysis

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Synthesis and Morphological Control of UO₂F₂Particulates

Synthesis and Morphological Control of UO₂F₂Particulates