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Theoretical characterization of the HSOH,H2SO and H2OS isomers
Authors:Pablo A Denis
Institution:1. Computational Nanotechnology , DETEMA Facultad de Química, Gral. Flores 2124, CC 1157, 11800 UDELAR, Montevideo, Uruguay pablod@fq.edu.uy
Abstract:The HSOH, H2SO and H2OS isomers have been investigated employing the CCSD(T) methodology and the cc-pV(X + d)Z X = 3,4,5,6 basis sets. The anharmonic force fields have been calculated to predict the fundamental vibrational frequencies, rotational constants, vibration–rotation corrections, anharmonic corrections to zero-point energies, and structural parameters. In addition to this, a spectroscopic characterization of the deuterated isomers D2SO and D2OS was performed. At the CCSD(T)/CBS limit and including corrections for scalar relativistic, spin orbit and core-valence correlation effects, the estimated enthalpies of formation are ?28.1 ± 1, ?12.3 ± 1, and 10.1 ± 1 kcal/mol for HSOH, H2SO and H2OS, respectively. Finally, we discuss the problems faced during the extrapolation to the CBS limit of the properties investigated.
Keywords:sulfur thermochemistry  correlation consistent basis sets  vibrational spectroscopy  combustion chemistry  coupled cluster
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