Matrix isolation study of the infrared spectrum of thioformaldehyde

Abstract

H 2CS has been trapped in argon and nitrogen matrices at 14 K as a product of the pyrolysis of s-trithiane or (CH 3S) 2 and of the ultraviolet or vacuum ultraviolet photolysis of CH 3SH. A small concentration of H 2CS has also been observed upon vacuum ultraviolet photolysis of a mixture of CH 4 and H 2S in an argon matrix. The isotopic data support the assignment of absorptions at 993 and at 1063 cm −1 to the out-of-plane deformation and the CS stretching fundamentals of H 2CS. Absorptions in the CH stretching region which were assigned to H 2CS in an earlier gas-phase study were confirmed in the matrix experiments. Studies of the vacuum ultraviolet photolysis of CD 3SH have provided information on the mechanism of the photolysis process.