Infrared spectral evidence for the formation of the new complexes dicarbonyldinitrosylosmium and tetracarbonylcobalt in frozen gas matrices at 20 K

Abstract

I.r. spectroscopy provides evidence for the photochemical reaction of pentacarbonylosmium with nitrogen oxide in argon matrices at 20 K to produce the hitherto unknown complex dicarbonyldinitrosylosmium [Os(CO)₂(NO)₂]. In the reverse of this type of reaction, photolysis of dicarbonyldinitrosyliron, tricarbonylnitrosylcobalt, and tetra-carbonylnitrosylmanganese in pure carbon monoxide matrices produces mononuclear carbonyl species. Isotopic substitution suggests that the cobalt species is tetracarbonylcobalt [Co(CO)₄] with C_3v geometry.