Noble gases fluorides

Fluorofullerenes have been prepared by reaction with halogen fluorides, by direct fluorination with F2 or by fluorination with noble gas fluorides [7,8,14], The reaction with high valence metal fluorides is the most versatile route for the synthesis of CsoFnH. 

Fluorine is the most energetic oxidizing element and as such is of prime importance in advanced oxidizers. The fluorine-based oxidizers discussed here include elemental fluorine, compounds containing oxygen and fluorine, nitrogen-fluorine compounds, halogen fluorides, and noble gas fluorides. 

Noble Gas Fluorides. Since the discovery of XeF4 in September 1962, several fluorides and oxygen fluorides of the three heaviest noble gases have been reported. As previously mentioned, the existence of such compounds intrigued propellant chemists with the possibility of gaining a new family of propellants. 

Among the noble gas fluorides, the binary fluorides of xenon have received the most attention as fluorinating agents. Krypton fluorides seem to be more exotic novelties than real reagents. 

The interhalogens, noble gas fluorides and derived ions will be treated systematically. The diatomic interhalogens will not be discussed, but the isoelectronic [XeF]+ and [KrF]+ cations will be included due to their important secondary bonding to fluoride to form an asymmetric, two-coordinate arrangement.6... 

Two points of view are applicable to these species, as they also are to the isoelectronic noble gas fluorides (1) a valence bond approach with promotion of electrons to d orbitals and (2) three-center, four-electron bonds. The same arguments, pro and con. apply as given previously, so they will not be repeated here. Independent of die alternative approaches via VB or MO theory, all are agreed that Madelung energy ( ionic character ) is very important in stabilizing both the polyhalide tons and the polyhalogens.27... 

J. Berkowitz, W.A. Chupka, Diatomic ions of noble gas fluorides, Chem. Phys. Lett. 7 (1970) 447. 

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