VI Tetrafluoride Oxide

Chromium(VI) tetrafluoride oxide CrF40 was first synthesized via fluor-ination of either metallic chromium or CrOj, and the route has been modified to use CrOj at lower temperature. Very recently, fluorination of Cr02F2 with KrF2 in anhydrous HF was reported. However, this route requires the use of a rather exotic fluorinating agent. The procedure described below involves the catalytic fluorination of Cr02F2 in the presence of CsF. 

Chromium(VI) tetrafluoride oxide (mp 55°) is a dark red solid that exists in equilibrium with its purple vapor at 25°. It is highly soluble in BrFj, SO2CIF, and anhydrous HF. The gas-phase IR spectrum has a very strong characteristic absorption band at 755 cm assigned to 77(6). Medium absorption bands are at 1028 Vi(Ai) and at 696 72( 1)cm . The mass spectrometric cracking pattern is CrOF, CrOF, CrOF, CrF, CrOF , CrO, and Cr.  

O Donnell, in Comprehensive Inorganic Chemistry, Vol. II, A. F. Trotman-Dickson, (ed.), Pergamon Press, London, 1973, pp. 1014-1019,1028-1030 Matheson Gas Data Book, 6th ed., Matheson Co., East Rutherford, NJ, 1980. 

Shriver, The Manipulation of Air-Sensitive Compounds, McGraw-Hill, New York, 1986 K. O. Christie, R. D. Wilson, and C. J. Schack, Inorg. Synth., 24, 5 (1986). 

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In the reactions with carbonyl compounds9 and carboxylic acids,21 molybdenum(VI) fluoride is converted into molybdenum(VI) tetrafluoride oxide (MoOF4), and with the thiocarbonyl compounds24 into molybdenum(IV) sulfide, but with acid chlorides, its fate is not known. 

Chromium(VI) tetrafluoride oxide CrOP4 23276-90-6 143.989 dark red solid 66 reac EIjO, ace, dmso... 

Xenon difluoride dissolves in water, yielding a solution which contains undissociated XeFa molecules which have a half-life of about 7 hours at 0°. It eventually hydrolyzes to yield the expected products, xenon, hydrogen fluoride, and oxygen. The hydrolysis reactions of the tetrafluoride and hexafluoride are somewhat more complicated. The addition of the stoichiometric amount of water to the hexafluoride results in the formation of xenon oxide tetrafluoride. Hydrolysis of either fluoride with an excess of water or acid yields in solution a stable xenon(VI) species, which has been shown to be hydrated xenon trioxide. Removal of the excess water leaves xenon trioxide as a solid residue. Inasmuch as this solid is an extremely sensitive explosive, such solutions must be handled with care. 

Ruthenium(VI) oxide tetrafluoride, [RUOF4], is reported to have been prepared by the action of a mixture of BrFj and Br2 on ruthenium. The enthalpy and entropy of vaporization. X-ray powder pattern and magnetic properties (jt = 2.91 BM at room temperature) have been measured. However more recently other workers also claim to have prepared [RUOF4] (by the fluorination of RuOj at 400-500°C), but it shows different properties to the earlier product. Evidence for its formulation is based on mass spectroscopy (which shows the molecular ion [RUOF4 ] ), elemental analysis and IR spectrum (v(Ru=0)= 1040cm ). The solid is unstable, even at room temperature, decomposing to [RUF4] and A report on the physical and chemical properties of... 

SELENIUM TETRAFLUORIDE, SELENIUM DIFLUORIDE OXIDE (SELENINYL FLUORIDE), AND XENON BIS[PENTAFLUOROOXOSELENATE(VI)l... 

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