Spectroscopic Identification of H₂NSO and syn‐ and anti‐HNSOH Radicals

Abstract

The simplest aminosulfinyl radical H NSO has been generated in the gas phase through flash vacuum pyrolysis of CF S(O)NH at approximately 1000 K. Upon UV light irradiation (365 nm), 1,3-H migration occurs in H NSO and furnishes an elusive N-amidyl radical HNSOH in syn and anti conformations in cryogenic matrices (N or Ar, 15 K). Further 266 nm laser irradiation results in dissociation of HNSOH to H O and SN and concomitant reformation of H NSO in trace amount. The identification of H NSO, syn-HNSOH, and anti-HNSOH by matrix-isolation IR spectroscopy is supported by high-level quantum chemical computations.