Preparation of FC(S)SF, FC(S)SeF and FC(Se)SeF through matrix photochemical reactions of F 2 with CS 2 , SCSe, and CSe 2

YANINA B. BAVA; MELINA V. COZZARÍN; CARLOS O. DELLA VÉDOVA; HELGE WILLNER; ROSANA M. ROMANO

PHYSICAL CHEMISTRY CHEMICAL PHYSICS

ROYAL SOC CHEMISTRY

Año: 2021 vol. 23 p. 20892 - 20900

1463-9076

The reactions of F2 with CS2 , SCSe, and CSe2 , respectively, were analyzed under matrix conditions by co-deposition of the halogen with the triatomic molecules trapped in argon matrices at cryogenic temperatures. In all cases, after co-deposition, the formation of the respective van der Waals complexes is observed. When each mixture is subsequently irradiated by means of broad-band UV-visible light (200 r l r 800 nm), FC(S)SF, fluorothiocarbonylsulfenyl fluoride, FC(S)SeF, fluorothiocarbonylselenylfluoride and FC(Se)SeF, fluoroselenocarbonylselenyl fluoride are produced, respectively. All these speciesexist as two stable planar syn- and anti-conformers (syn- and anti- of the C=Z double bond, Y = S, Se, with respect to the S?F or Se?F single bond, respectively). For FC(S)SF, syn- is the rotamer with the lowest energy, while for both FC(S)SeF and FC(Se)SeF the anti-form is the lowest energy conformer. In all cases, other products due to alternative or subsequent photochannels are observed during thephotochemical processes carried out in argon matrices at cryogenic temperatures.