Pressure dependence of ¹H and ¹⁹F chemical shifts in 1,1-difluoroethylene gas and in gaseous mixtures

Abstract

We have measured the chemical shifts, δ, and ‘second virial shielding coefficient’, σ₁, for gaseous 1,1-difluoroethylene and its mixture with other gases at varying pressures (∼ 10–45 atmospheres). The δ vs ρ (density) plot for ¹H and ¹⁹F resonances is found to be linear within the pressure range studied. The sign of σ₁ is negative. The influence of perturbers on δ and σ₁ is in the following order: Xe>SF₆>Kr>SiF₄>CH₄>CF₄ (spherical top molecules) and C₂H₆>C₂H₄>HCl>CO₂ (non-spherical top molecules). These trends are true for polar and non-polar solutes.

Additional information

Notes on contributors

S. Mohanty

On leave from the Department of Physics, Utkal University, Bhubaneswar 751004, India.