99410-62-5Relevant articles and documents
The preparation of bis(perfluoroethyl) tellurium difluoride and dichloride, trans perfluoroethyl tellurium monochloride tetrafluoride, trans bis(perfluoroethyl) tellurium tetrafluoride; and the preparation and X-ray crystal structure of perfluoroethyl tellurium trifluoride
Lau, Clement,Passmore, Jack,Richardson, E. Keith,Whidden, Tom K.,White, Peter S.
, p. 2273 - 2280 (2007/10/02)
The reaction of (C2F5)2Te and XeF2 in a slurry of SO2ClF yielded (C2F5)2TeF2 essentially quantitatively.Chlorine and (C2F5)2Te gave (C2F5)2TeCl2.Both (C2F5)2TeF2 and (C2F5)2TeCl2 were assigned a trigonal bipyramidal geometry, on the basis of their 19F nmr and vibrational spectra, with the lone pair and C2F5 groups in equatorial, and the halogens in the axial positions.Perfluoroethyl tellurium trifluoride was prepared essentially quantitatively by the reaction of C2F5TeTeC2F5 and XeF2 in liquid SO2F2.The generally inert SO2ClF was found to react with C2F5TeTeC2F5 to give C2F5TeClxF3-x and sulphur dioxide.The structure of C2F5TeF3 was determined by X-ray diffraction.The crystals are tetragonal with a=10.129(4), c=25.561(6) Angstroem, and Z=16.The structure was refined in space group I41/a to a conventional R factor of 0.051 for 901 observed reflections with I>/=3?(I).Each tellurium atom is surrounded by two terminal fluorine atoms and two bridging fluorine atoms and a C2F5 group in an axial position around the apex of a distorted square pyramid.The square-pyramidal units are linked by symmetrical cis bridging atoms into endless chains with bridging angles of 180o and 177o.The geometry of the (C2F5TeF4) group is consistent with steric activity of the non-bonded electron pair.The 19F nmr and Raman spectra of C2F5TeF3 were recorded and the Raman spectrum assigned.Trans-C2F5TeClF4 was prepared by the reaction of C2F5TeTeC2F5, and an excess of ClF.The trans octahedral geometry of C2F5TeClF4 was unambiguously assigned from its 19F nmr and vibrational spectra.A mixture of trans-(C2F5)2TeF4 and trans-C2F5TeClF4 was obtained from the reaction of (C2F5)2Te and an excess of ClF.Trans geometry of (C2F5)2TeF4 was unambiguously assigned from its 19F nmr spectrum.
