Microwave spectrum of tellurium pentafluoride chloride
Legon, A. C.
Журнал:
Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
Дата:
1973
Аннотация:
The microwave spectra of twelve isotopic species of tellurium pentafluoride chloride are reported. Each spectrum shows rigid symmetric top behaviour with nuclear quadrupole coupling effects due to the <sup>35</sup>Cl and <sup>37</sup>Cl nuclei unresolved. The rotational constants, B 0, for the ground vibrational state of the various isotopic species of ClTeF5 are as follows. [graphic omitted]The r s distance for the Teâ Cl bond is directly determined from the rotational constants as 2.250 ± 0.002 à . Although a unique determination of the remaining three structural parameters is not possible, a graph is presented which shows the variation of r(Teâ F)axial and r(Teâ F)equatorial as a function of the angle (Fâ Teâ Faxial) assuming a structure of C 4ν symmetry. Thus, if one of the three unknown parameters can be determined by another method, the remaining two can be obtained uniquely from the graph. If equality of the axial and equatorial Teâ F distances is assumed the resulting structure is: r(Teâ F)= 1.8305 ± 0.0012 à , angle (Fâ Teâ F)axial= 88°15⠲± 7â ².An excited vibrational state, probably the Teâ Cl wagging vibration, ν 11, has been assigned and the values α11= 0.775 and 0.718 MHz for the <sup>35</sup>Cl and <sup>37</sup>Cl species respectively are reported.
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