Thermodynamic investigation on the reactions of formation of the compounds RE(C5H8NS2)3(C12H8N2) (RE = Eu, Tb)

摘要: Abstract The reactions of ammonium pyrrolidinedithiocarbamate (APDC) and 1,10-phenanthroline ( o -phen · H 2 O) by hydrated lanthanide chlorides in the presence absolute ethanol yield two novel derivatives represented with empirical formula RE(PDC) 3 (phen) (RE = Eu, Tb). resulting compounds were characterized elemental analysis, TG-DTG i.r. spectrum. enthalpy change reaction complex formation from a solution reagents, Δ r H m θ l ) , molar heat capacities compounds, c determined at T  = 298.15 K using an RD496-III conduction microcalorimeter, which (−22.21 ± 0.08) kJ · mol −1 (61.68 ± 0.65) J · mol  · K for Eu(PDC) (−21.04 ± 0.05) kJ · mol (67.74 ± 0.60) J · mol Tb(PDC) (phen), respectively. On basis appropriate thermochemical cycles other auxiliary thermodynamic data, changes regents solid phase, s calculated as being (54.53 ± 0.31) kJ · mol (40.20 ± 0.36) kJ · mol (phen). thermodynamics investigated ethanol. Fundamental parameters, activation ≠ entropy S free energy G apparent rate constant k ), E pre-exponential A order n obtained combination data kinetic equations thermokinetic experiments.