Journal of Chemical Thermodynamics, Vol.101, 162-167, 2016
Thermodynamic study of sublimation, melting and vaporization of scandium(III) dipivaloylmethanate derivatives
The present work deals with the investigation of thermal properties of two volatile scandium(III) beta-diketonates with 2,2,6,6-tetramethyl-4-fluoro-3,5-heptanedione and 1,1,1-trifluoro-5,5-dimethyl-2,4- hexanedione which have been synthesized and purified. Using the static method with glass membrane gauge-manometer the temperature dependencies of saturated and unsaturated vapor pressure were measured for the first time. The temperatures and enthalpies of melting were measured for these compounds by differential scanning calorimetry. The standard thermodynamic characteristics of enthalpy and entropy for sublimation, vaporization and melting processes were derived. (C) 2016 Elsevier Ltd.
Keywords:Scandium beta-diketonates;DSC;Static method with glass membrane gauge-manometer;Vapor pressure;Thermodynamic characteristics;Melting and evaporation processes