Xenon halides

Pure NI3 has not been isolated, but the structure of its well-known extremely shock-sensitive adduct with NH3 has been elucidated — a feat of considerable technical virtuosity.Unlike the volatile, soluble, molecular solid NCI3, the involatile, insoluble compound [Nl3.NH3] has a polymeric structure in which tetrahedral NI4 units are comer-linked into infinite chains of -N-I-N-I- (215 and 230 pm) which in turn are linked into sheets by I-I interactions (336 pm) in the c-direction in addition, one I of each NI4 unit is also loosely attached to an NH3 (253 pm) that projects into the space between the sheets of tetra-hedra. The stmcture resembles that of the linked Si04 units in chain metasilicates (p. 349). A further interesting feature is the presence of linear or almost linear N-I-N groupings which suggest the presence of 3-centre, 4-electron bonds (pp. 63, 64) characteristic of polyhalides and xenon halides (pp. 835-8, 897). 

Many of the reactions that xenon fluorides undergo are similar in some ways to those of interhalogens. However, the xenon halides differ markedly in terms of their reactivity, with XF2 being much less reactive than either XeF4 or XeF6. The difluoride reacts only slowly with water,... 

Xenon fluorides, 77 323-325 binary, 77 335-336 Xenon-gold cations, 77 332 Xenon halides, 77 323-325 Xenon hexafluoride, 7 7 325, 329 uses for, 7 7 336 Xenon ion lasers, 74 685 Xenon isotopes, in fission reactors, 77 375 Xenon oxide difiuoride, 77 326 Xenon oxide fluorides, 7 7 326 Xenon oxides, 77 325-326 Xenon oxide tetrafluoride, 77 326 Xenon testing, in plastics weathering, 79 584-585... 

M. Zupan, Xenon Halide Halogenation , in The Chemistry of Halides, Pseudo-Halides and Azides (Eds. S. Patai and Z. Rappoport), Wiley, Chichester, 1983, Ch. 15, p. 657. 

There is little, if any, difference in the reactions of the different spin-orbit states for Xe (3P2il) and Kr (3P21) [603], but differences are noted for the reactions of Ar (3P2il 0) [603, 606]. The reactions Xe + BrCN, ICN [603, 609] do not give rise to emission from any xenon halide product, but do show emission from CN (B2D+ and A2II), which results from the initially formed inert gas cyanide (Rg+CN-) rapidly predissociating to give Rg + CN. ... 

The xenon halides, oxyhalides, and oxides are isoelec-tronic with many other compounds and ions containing halogens. Give a compound or ion, in which iodine is the central atom, that is isoelectronic with each of the following. 

Xenon halides reactions with organic radicals 5.9 organoboranes 5.9 organotelluriums 5.9... 

This year s group of publications upon the rare-gas halides includes a careful study of the ordering of the B and C states in XeCl, XeBr, and KrCl by observation of the temperature dependences of the C A and B A emissions. " For KrCl, the alphabetic ordering of the states is confirmed, whereas the B state is found to lie above the C for the xenon halides. " The value of Eq—Eb for XeCl, —130 35 cm" differs considerably from that estimated from XeCl fluorescence measurements carried out at room temperature, 5.4 25 cm". The determination of the correct ordering of these states is of some importance, not only for overall modelling of the rare-gas halide laser systems, but also because if the C state lies sufficiently below the B, then lasing on the C A transition becomes possible, as has been shown in the successful operation of the XeF (C - A) laser at 470 nm. Measurements of the polarization of fluorescence from XeF(5) produced by 193 nm photolysis of XeFj has been... 

FIGURE 1. The approach to the spectator stripping limit of reaction dynamics rotational alimment of xenon halides generated through collisions of a superthermal beam of XepP2> with hydrogen halides. 

Other xenon halides include the dichloride, the tetrachloride, and the dibromide, but these are not particularly stable. Solutions of xenon trioxide, called xenic acid, are excellent oxidizing agents, as is the octahedral perxenate anion, XeOg. Krypton difluoride, a few nitrogen compounds of both xenon and krypton, and radon difluoride have also been prepared but are not well-characterized. 

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