Vapor Pressure and Viscosity of 1,1,1,5,5,5-Hexafluoro-2,4-pentanedione

Abstract

The viscosity and vapor pressure of the reactive chelating ligand, 1,1,1,5,5,5-hexafluoro-2,4-pentanedione (H+hfac) have been determined. The viscosity of liquid H+hfac was determined to be (1.39 ± 0.19) × 10-3 Pa·s at 24 °C and (8.35 ± 0.25) × 10-4 Pa·s at 35 °C. The vapor pressure of H+hfac was found to range from 4 kPa at 0 °C to 49.5 kPa at 57 °C. The viscosity was measured using a capillary tube viscometer, and the vapor pressure was measured using a mass transfer gas saturation apparatus. These methods were employed because conventional methodologies would have produced unreliable data due to the formation of the tetrol hydrate of H+hfac inside the apparatus and potentially exposed laboratory personnel to hazardous working conditions.