Matrix isolation infrared spectrum and vibrational potential function of sulfur monochloride

Infrared spectra of sulfur monochloride in various solid matrices were taken at 12°K. The sharpness of the band seen at 550 cm−1 compelled its assignment as the S–S stretching mode. Enrichment of samples with 37Cl led to the identification of the chlorine isotopic splittings on the two S–Cl stretching modes observed near 450 cm−1. A normal coordinate analysis was performed; on the basis of the best frequency fit, the band observed at 457.5 cm−1 was assigned to the symmetric S–Cl stretching mode and that at 449.0 cm−1 to the asymmetric mode. The force field derived from the normal coordinate analysis shows a weaker S–Cl bond than in SCl2, but essentially the same S–S bond strength as H2S2.