Hydrothermal Syntheses, Structures, and Magnetic Properties of the U(IV) Fluorides (C5H14N2)2U2F12·5H2O and (NH4)7U6F31

Crystalline oxyfluorinated open-framework compounds: Silicates, metal phosphates, metal fluorides and metal-organic frameworks (MOF)

“…This idea was particularly exploited by Weller (UK) who reported the formation of different amine-templated lithium beryllofluorides exhibiting three-dimensional openframeworks [108] or two-dimensional networks [109,110], constructed from the connection of MF 4 (M = Li, Be) tetrahedral units. In contrast, the synthesis of fluorides incorporating larger cations such as uranium [111][112][113][114][115][116][117] or thorium [118] were extensively explored in the presence of amine species and chain-like or layered solids were described; one of them consists of U-F sheets with 12-membered rings [117]. Very recently, the scandium-fluorine-amine chemistry system was investigated [119] and a 3D framework similar to that of Rb 2 In 3 F 11 was evidenced.…”

Homopiperazine (Hexahydro-1,4-diazepine)

“…At present, it is commercially available from several major suppliers and it has recently found various applications, including as a component of liquids for CO 2 capture [4] and as a component of various organic and organic/inorganic supramolecular ionic salts and transition metal complexes. In these latter applications, the materials are often characterised by X-ray diffraction and so there are a large number of X-ray structures involving a homopiperazinium dication in salts or mixed salts with, for example, carboxylic acids [5][6][7], potassium perchlorate [8], ammonium perchlorate [9], manganese sulfate oxalate [10], cobalt sulfate [11], zinc phosphate [12], arsenic oxide [13], tellurium phosphate [14], cadmium phosphate [15], cadmium chlorides [16,17], lead bromide [18], bismuth iodide [19], uranium fluoride [20] and uranium sulfate [21]. There are also a significant number of structures in which homopiperazine acts as a bidentate ligand on nickel [22,23], copper [24] and platinum [25][26][27][28].…”

Expanding pentafluorouranates: hydrothermal synthesis and characterization of β-NaUF5 and β-NaUF5·H2O

“…[3][4][5][6] The extension of hydrothermal reaction methodologies to uranium uoride synthesis has resulted in a large expansion of well-characterized examples, especially through the incorporation of organic structure-directing agents. [7][8][9] While many of these compounds contain previously known U(IV) and U(VI) topologies, some previously unknown structure types were identied. 10,11 More recently, a number of ternary and quaternary hydrated, hydronium, alkali, and transition metal uranium uorides have been reported for potential applications as phases for separation of actinides or use in molten ux reactors.…”