1H and 13C Nuclear Magnetic Shielding in Gaseous and Liquid Propene

Propylene, C3H6, was studied by high resolution NMR spectroscopy in liquid and gaseous state at 300 K. Extrapolation of gas-phase 1H and 13C chemical shifts to the ero-den sity limit permit ted the determinations of absolute nuclear magnetic shielding in the isolated propylene molecule. These new experimental results were used in a reliable verification of ab in itio calculations of proton and carbon nuclear magnetic shielding. The analogous pure liquid propylene spectra were also measured. The second virial coefficients and gas-to-liquid shifts were discussed in the context of intermolecular inter actions in gas and association in liquid phase.