Vibrational Spectra and Structure of Xenon Tetrafluoride

Xenon Suboxides Stable under Pressure

“…This is consistent with a presence of Xe 4+ and O 2− atoms within the chains. 4,37 The geometry of these chains is very similar; at P = 100 GPa, the Xe−O separations are 2.06 (2.05−2.07, 2.04) Å in the most stable phase of Xe 3 O 2 (Xe 2 O, Xe 7 O 2 ), and the bridged Xe−Xe separations are 3.25 (3.22, 3.14) Å. Similar AX 2 chains are found, for example, in the crystal structures of chromium dihalides, which contain an ionic component, 38,39 and some alkali metal suboxides and alkaline earth subnitrides feature chains of fused M 6 O octahedra with intercalated free metal atoms.…”

The Raman spectra of solid xenon tetrafluoride and its adduct with xenon difluoride

“…A factor group analysis of the unit cell is presented in Table 11. In the spectrum of the vapour v4(b,,) has about one-tenth the intensity of vl(alg) [2]. Likewise the 6A, + 6 4 , internal crystal modes derive from the ungerade molecular modes.…”

“…The Raman [l] and infrared [2] spectra of gaseous xenon tetrafluoride have previously and properly been interpreted in terms of a XeF, molecule of D,, symmetry, which has the vibrational representation a,g+b,g+b,g+a,,+b,u+2e,.…”

“…For the solid tetrafluoride, Claassen et al [2] observed only three Raman lines, which they assigned to fundamentals in the three Raman-active, gerade modes of a D,, XeF, species, viz 543 cm-I, v l ( a l g ) ; 502 cm-', ~~( b~~) ; 235 cm-', v2(blg). During recent studies made in these laboratories of complex formation between xenon tetrafluoride and antimony pentafluoride [3,4,51, the purity of the xenon tetrafluoride used was routinely checked by recording the Raman spectrum of the solid.…”

Force field, Coriolis coupling coefficients, generalized mean square amplitudes of vibration and shrinkage constants of XeF4 and XeOF4

“…The equilibrium F--Xe--F angle is 90 ~ [6--11]. The vibrations of XeF 4 [13,14] in D4h symmetry are classified into: alg -~-blg-~-~-b2g -~-2eu + a2u -~-bxu, of which the blu mode is inactive in both infrared and Raman.…”