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S 4 N 4  reacts at 25 °C with trifluoro and trichloro acetic acid anhydride, respectively, to yield yellow crystalline CX 3 –CO–NS 3 N 2  (X = F, Cl), the mass, infrared, and Raman spectra of which are reported. An X-ray structure analysis of monoclinic CF 3 CONS 3 N 2  revealed a non-planar five-membered S 3 N 2  ring containing an unusually long (2.206 A) sulfur-sulfur bond with one sulfur atom additionally connected to an exocyclic nitrogen atom by a multiple bond. Comparisons with the infrared spectra of S 3 N 2 O and ten compounds of type RNS 3 N 2  allowed to identify four wavenumbers characteristic for the S 3 N 2  ring. The relationship μ = 23.09d-27.27 has been derived for stretching vibrational wavelengths, μ (in μm), and bond distances, d (in Å), of sulfur-nitrogen bonds.

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Darstellung, Schwingungsspektren und Röntgenstrukturanalyse von Trifluor- und Trichloracetyltrischwefeltrinitrid, CX 3 CO-NS 3 N 2  1  / Synthesis, Vibrational Spectra, and X-ray Structure Analysis of Trifluoro and Trichloroacetyl Trisulfurtrinitride, CX 3 CO—NS 3 N 2  1