Vibrational Spectraand Force Constants of Symmetric Tops,XXXII [1]. High Resolution Infrared Investigation of Unstable H3SnCl in the ν1/v4 Region Near 1900 cm-1

Abstract

The infrared spectra in the ν1/v4 region near 1900 cm-1 of natural H3SnCl and monoisotopic H3 116Sn35Cl have been recorded with a resolution of 0.04 cm-1. Isotopic and rotational fine structure has been resolved, and a rotational analysis based on 472 lines, σ(J, K) - 4.3x 10-3 cm-1, has been performed, ν1, and v4 (v0 = 1917.1932(7) and 1924.6790(4) cm-1 respectively in H3 116Sn35Cl) interact weakly by Coriolis x, y resonance, |ζ y l,4| ~ 0.019. No further perturbations of ν1 and v4 were observed. The tin isotopic shift of v4 is significant, Δν4 relative to 116Sn being -0.170(6) and -0.326(6) cm-1 respectively for 118Sn and 120Sn. The hot band (ν3 + ν4) - ν3 has been observed, x34 = + 0.423(5) cm-1.