1-BUTYL-3-METHYLIMIDAZOLIUM METHANESULFONATE: LOWTEMPERATURE HEAT CAPACITY AND STANDARD THERMODYNAMIC FUNCTIONS OF FORMATION. PART IIтезисы докладаТезисы
Место издания:G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences Ivanovo, Russia
Первая страница:218
Последняя страница:218
Аннотация:This work is a part of systematic study of the thermodynamic properties of ionicliquids by classical thermochemical methods: low-temperature vacuum adiabatic calorimetryand dissolution calorimetry. The object of this study is 1-butyl-3-methylimidazoliummethanesulfonate (BmimMS). The aim of the work is to determine the low-temperature heatcapacity over a wide temperature range and to calculate the standard thermodynamicfunctions of the BmimMS formation in the crystal and liquid states.The isobaric heat capacity of the crystal and liquid phases of BmimMS wasdetermined in the temperature range from 80 to 380 K by the vacuum adiabatic calorimetry.There are no phase transition exept melting at 349.13 ± 0.2 K on the heat capacity curve ofBmimMS (Figure 1). Melting parameters were also refined by DSC. At temperatures from 5to 80 K the heat capacity of BmimMS was assessed by the Kelly method. The temperaturedependencies of BmimMS main thermodynamic functions have been determined in thetemperature range from 5 to 380 K (isobaric heat capacity Cp,m(T), standard entropy S0m(T),heat content H0(T) ‒ H0(0), Gibbs energy content G0(T) ‒ H0(0)). The BmimMS enthalpy offormation at 298.15 K was previously determined by the dissolution calorimetry [1]. In thepresent study the standard entropies and Gibbs energies of BmimMS formation in the crystaland liquid state at 298.15 K were calculated from the experimental data of adiabaticcalorimetry in conjunction with dissolution calorimetry data. Comparison of the obtainedthermodynamic characteristics with the literature data was carried out.[1] L.A. Tiflova, D.A. Kalinyuk , A.I. Druzhinina, Book of abstracts of XXIII InternationalConference on Chemical Thermodynamics in Russia, 2022, 86.Investigation was supported by the Program “Chemical Thermodynamics and TheoreticalMaterial Science” (AAA-1210313000391) and by the Federal Project "Growth of AdvancedInfrastructure for Research and Development in the Russian Federation" of the nationalproject "Science and Universities" (updating of equipment for scientific research).
