MICROWAVE SPECTRUM OF PENTAFLUOROSULFANYLIMINOSULFUR DIFLUORIDE
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Date
1985
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Publisher
Ohio State University
Abstract
The low resolution spectrum of the most abundant isotopic species of pentafluorosulfanyliminosulfur difluoride, $F_{2}^{32}S-N^{32}SF_{5}$, in the region of 12.5-26.5 GHz consists of an intense series of $^{A} $R-type bands and a weak series of $^{C} $q-type bands. Analysis of this low resolution spectrum gave parameters of B+C = 1538 MHz and 2A-B-C = 2389 MHz. These parameters indicate that the sketal structure of the molecule is one having the sulfur and nitrogen lone pair electrons cis to the S=N bond. The high resolution spectra for three isotopic species, all in natural abundance, have been measured and assigned. The rotational constants (in MHz) determined by use of the Kirchhoff NBS fitting $program^{1}$ are: $F_{2}^{32} S= N^{32}SF_{5}$ (100 transitions), $A=1964.90(2), B=784.93(1), C=754.00(1); F_{2}^{34}S=N^{34}SF_{5}$ (25 transitions), $A=1959.83(3), B=774.01(1), C=744.66(1); F_{2}^{32}S=N^{34}SF_{5}$ (35 transitions), A=1964.72(2), B=782.69(1), C=751.98(1). A preliminary structural fit of these constants indicates that the bond lengths are close to the values obtained for similar compounds but the SNS angle is considerably larger than the SNC angle in $F_{2}S = NCDF$ and $F_{2} S =NCF_{3}$. Details regarding the assignments and the structural parameters obtained will be discussed.
Description
$^{1}$W. H. Kirchhoff, J. Mol. Spectrosc. 41, 333 (1972). $^{*}$Work supported by NASA Langley
Author Institution: Department of Chemistry, Virginia Tech; Department of Chemistry, Xerox Corporation; Department of Chemistry, University of Alabama; Department of Chemistry, Virginia Tech
Author Institution: Department of Chemistry, Virginia Tech; Department of Chemistry, Xerox Corporation; Department of Chemistry, University of Alabama; Department of Chemistry, Virginia Tech