Phosphorous oxyfluorides

Fluorine and phosphorous NMR data are given in Scheme 7.10 for a number of phosphorous oxyfluorides, and a fluorophosponate ester as well. 

Tetravalent uranium can be precipitated from aqueous solution as the insoluble oxalate, fluoride, or phosphate. UF4 precipitated from aqueous solution contains water of crystallization. When this compound is heated to drive off the water, it is partially hydrolyzed to an oxyfluoride. The phosphate U3(P04)4 is soluble in hot, concentrated phosphoric acid and appears in this form when uranium in phosphate rock, Ca3(P04)2, is dissolved in sulfuric acid. 

Nonflammable gas high thermal stability. Sensitive to moisture, decomposed by water, forming phosphorus oxyfluoride, hydrogen fluoride, and phosphoric acid. Intermediate oxyfluorophosphates are formed, too. Reaction with water is exothermic. 

Xia Z, Liu R-S, Huang K-W, Drozd V (2012) Ca2Al306F Eu a green-emitting oxyfluoride phosphor for white light-emitting diodes. J Mater Chem 22 15183... 

Im WB, George N, Kurzman J, Brinkley S, Mikhailovsky A, Hu J, Chmelka B, Denbaars SP, Seshadri R (2011) Efficient and Color-Tunable Oxyfluoride Solid Solution Phosphors for Solid-State White Lighting. Adv Mater 23 2300... 

Lanthanum oxyhalides including LaOF doped with luminescent rare-earth ions were studied as phosphors for potential applications in the earlier times [82]. Crystal structures and optical or luminescent properties of rare-earth oxyfluoride compounds were extensively investigated in the 1990s [81-87]. Usually, rare-earth doped oxyfluoride materials are synthesized by heat treatments of rare-earth fluorides in the air [88] or mixtures of rare-earth oxides and NH4F in N2 atmosphere [89]. 

S. Eujihara, S. Kitta and T. Kimura, Porous phosphor thin films of oxyfluoride Si02-BaMgF4 Eu glass-ceramics prepared by sol-gel method, Chem. Lett., 32, 928-929 (2003). 

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