Photochemistry of XCH2CN (X = -Cl, -SH) in Argon Matrices

Joanna Zapala (1) , Thomas Custer (1) , Jean-Claude Guillemin (2) , Marcin Gronowski (1)

1 PAN - Polska Akademia Nauk = Polish Academy of Sciences = Académie polonaise des sciences
2 ISCR - Institut des Sciences Chimiques de Rennes

We report infrared spectra and photochemical behavior of the potentially astrochemically significant species, mercaptoacetonitrile (HS-CHC≡N) and, for comparison purposes, chloroacetonitrile (Cl-CHC≡N), both suspended in an argon matrix at 6 K. Photolytic formation of the isocyano products HS-CH-NC and Cl-CH-NC were observed as well as CHNSC and CHSCN (in HS-CHCN photolysis). While no dissociation products were observed for Cl-CH-CN, photolysis of HS-CH-CN produced compounds necessitating the loss of the CN group to form CH═S, the SH group to form HC-CN and HC-CN, or both CN and SH to form CH and CH. Observation of emission spectra upon annealing indicates the presence of free sulfur atom in matrices of photolyzed HS-CH-CN.

Domaines: Chimie théorique et/ou physique

Joanna Zapala, Thomas Custer, Jean-Claude Guillemin, Marcin Gronowski. Photochemistry of XCH2CN (X = -Cl, -SH) in Argon Matrices. Journal of Physical Chemistry A, 2019, 123 (17), pp.3818-3830. ⟨10.1021/acs.jpca.9b01983⟩. ⟨hal-02149782⟩