Oxyfluorides and Oxides

The pH of a freshly prepared 0.4% solution of stannous fluoride is between 2.8 and 3.5. Initially clear aqueous solutions become cloudy on standing owing to hydrolysis and oxidation. The insoluble residue is a mixture containing stannous and stannic species, fluoride, oxide, oxyfluorides, and hydrates. 

Zmbov et al. (1 ) Investigated the stabilities of some molybdenum and tungsten oxyfluorides by means of mass spectrometry. These studies led to enthalpies of formation for MoO F Cg), WO F (g), and WOF (g) which were used by the authors to develop a correlation among the enthalpies of formation of the oxides, oxyfluorides, and fluorides of Mo and W. a H (298.15 K) varies almost linearly with the number of oxygen atoms (1 ) for the series WF, WOF and VO o Assuming a similar variation for MoFg, MoOF and... 

Oxides, oxyfluorides and fluorides of trivalent metals among which aluminium, chromium and iron, are generally used as catalysts, also supported or in mixture with other metals, usually bivalent metals [8]. In particular chromium oxide and fluorinated chromium oxide have found industrial applications [9] but the study relative to the catalytic mechanism and to the catal34ic nature of the species involved is still under way. 

Prior to 1962 the rare gases were frequently called inert gases as no chemical compounds were known (there were a few clathrates and hydrates ), but the realization that the ionization potential of xenon was sufficiently low to be accessible to chemical reaction led to the preparation of several fluorides, oxides, oxyfluorides, and a hexafluoroplatinate of xenon. Several unstable krypton and radon compounds have been synthesized. 

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See also in sourсe #XX -- [ , ]

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