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Sulfur-Pentafluoride Isocyanide, SF5NC

Authors

  • Prof. Joseph S. Thrasher,

    Corresponding author
    1. Department of Chemistry, The University of Alabama, Tuscaloosa, AL 35487 (USA)
    • Department of Chemistry, The University of Alabama, Tuscaloosa, AL 35487 (USA)
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  • Krishnan V. Madappat

    1. Department of Chemistry, The University of Alabama, Tuscaloosa, AL 35487 (USA)
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  • This work was supported by the State of Alabama and the Petroleum Research Fund, administered by the American Chemical Society. We thank Dr. Matthew Clark for his assistance with the AM1 calculations, Dr. Jon B. Nielsen for technical assistance, and Prof. Helge Willner for sharing his research results prior to publication.

Abstract

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Two elusive but relatively simple SF5 compounds have been independently prepared by two research groups : SF5CN results from treatment of dirhodane with fluorine [Eq. (a)], and the structural isomer SF5NC can be obtained by debromination of SF5N = CBr2 [Eq. (b)]. The IR spectrum of the cyanide displays the characteristic CH stretching band at 2235 cm−1, while the corresponding band for the isocyanide is located at 2080 cm−1. Even though SF5NC isomerizes to SF5CN at room temperature and pressures < 50 Torr, the cyanide itself is remarkably stable. Both are gaseous, and they are expected to display unusual chemical and physical properties.

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