Infra-red cryogenic studies. Part 7.—Hydrogen sulphide in matrices

Abstract

Infra-red spectra are reported of H₂S in argon, krypton, nitrogen, and carbon monoxide matrices at 20 K. Assignment of the two stretching modes is in agreement with previous work for the nitrogen matrix, but not for argon and krypton matrices. The separation and relative intensity of the stretching fundamentals show surprisingly large variations between the various matrices. The ν₃ and ν₁ modes are observed at 2629.1 and 2582.5 cm^–1(Ar), 2617.7 and 2576.0 cm^–1(Kr), 2632.6 and 2619.5 cm^–1(N₂), and 2619.9 and 2606.2 cm^–1(CO). In argon and krypton matrices ν₃ is much weaker than ν₁, as for the gas phase, while in nitrogen and carbon monoxide, ν₃ is more intense than ν₁. Quadratic valence force constants are derived from the observed frequencies.