Abstract
The infrared spectra of XeF 2, XeF 4 and XeF 6 molecules were investigated in liquefied noble gas solutions. It is shown that incryogenic solution (liquid Xe, T=180 K) XeF 2 and XeF 4 molecular structure weak distortion due to the effective solute-solvent interaction takes place. The anharmoniciti constants X 13 (XeF 2) and X 46 (XeF 4) were computed. It was found that the increase of XeF 6 concentration in a liquid xenon solution causes both the decreas of the number of monomers XeF 6 with the strong 596 cm −1 band and the polymers (XeF 6) n formation characterised by intensive band group in 620–640 cm −1 region. The equilibrium constants were computed for reaction n(XeF 6) = (XeF 6) n (n=2,4). It is shown that in contrast to classical octahedral molecules such as SF 6, UF 6 and others [1], polymerization of xenon hexafluoride is followed by the stabilization of non-rigid structure of this molecule at the expense of the mobiliti decrease of the fluorine atoms which results in the decrease of XeF bond rigidity. The results of the studies on IR spectra of XeF 6 in liquid-xenon solution over the wide frequency range 400–2000 cm −1 led to the conclusion that the geometrical configuration of an octahedron distorted to a C 3v-symmetry is the basic one for xenon hexafluoride.
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