Abstract
17O and 33S NMR chemical shifts of sulfur dioxide (SO 2) were measured for the range of density (0.05–0.3 mol l −1) in the gas phase at 300 and 333 K. The chemical shifts for both nuclei are linearly dependent on density showing an increase of 17O magnetic shielding and a decrease of 33S shielding due to intermolecular interactions. The present measurements have permitted the quantitative separation of the shielding contributions due to intermolecular interactions ( σ 1) and the shielding parameters of isolated molecules ( σ 0). Analogous 17O NMR measurements were also carried out for gaseous sulfur trioxide (SO 3) at 333 K. A decrease of oxygen shielding was observed here for larger densities, but the latter compound could be examined only in the very small range of density (∼0.02–0.08 mol l −1) and the shielding parameters were determined with lower accuracy. It was confirmed by the 17O and 33S NMR spectra of liquid SO 2 and SO 3 that intermolecular interactions in gases and liquids change the shielding constants in the same directions.
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