High-Pressure19F NMR Measurements of a Series of Fluorinated Benzenes in Supercritical Carbon Dioxide

Abstract

The high-pressure and high-resolution NMR cell method has been developed for precise measurements of supercritical carbon dioxide solutions. 19F NMR chemical shifts of a series of fluorinated benzenes, C6H n F m (n = 6 − m and m = 1 ∼ 6) in CO2 at dilute concentrations were measured over a wide pressure range up to 35 MPa at 314.3 K. The density dependence of the corrected chemical shift, where the bulk magnetic susceptibility contribution was subtracted, was well represented by a cubic function of CO2 density for any fluorinated benzene. The linear coefficients, arising from pairwise intermolecular interactions, were found to be dependent on the numbers and positions of fluorine atoms in the fluorinated benzenes. The solute–solvent interaction between fluorine and CO2 was discussed.