The Photolysis of Matrix Isolated cis-Thionylimide. 2. The Identification and Infrared Spectra of trans-HNSO and NSO

Abstract

It is shown that the low energy (λ > 3000 Å) photolysis of cis-HNSO in an argon matrix leads to formation of trans-HNSO. Four i.r. absorptions are observed and assigned for trans-HNSO and an approximate partial force field is calculated using data from isotopic substitutions. A comparison is made of the i.r. spectra of cis- and trans-HNSO using the intramolecular hydrogen bond of the cis form as a basis for explanation of the differences. Photolysis of cis-HNSO in argon matrices using vacuum u.v. light (1216 Å) has resulted in a single i.r. absorption at 1195 cm−1 which has been assigned to the radical, NSO.