Standard Molar Enthalpy of Formation of RE（ C5H8NS2 ）3 （C12H8N2）
摘要
Five solid ternary complexes of RE(CsHsNS2)3(o-phen) (RE=Ho, Er, Tm, Yb, Lu) have been synthesized in absolute ethanol by rare earth chloride low hydrate reacting with the mixed ligands of ammonium pyrrolidinedithiocarbamate (APDC) and 1,10-phenanthroline·H2O (o-phen·H2O) in the ordinary laboratory atmosphere without any cantions against moisture or air. IR spectra of the complexes showed that the RE^3+ coordinated with six sulfur atoms of three PDC^- and two nitrogen atoms of o-phen·H2O. It was assumed that the coordination number of RE^3+was eight. The constant-volume combustion energies of the complexes, △cU, were determined as (-16788.46+7.74), (-15434.53+8.28), (-15287.80+7.31), (-15200.50+7.22) and (-15254.34+6.61) kJ·mol^-l, respec-tively, by a precise rotating-bomb calorimeter at 298.15 K. Its standard molar enthalpies of combustion, △cHm^θ,and standard molar enthalpies of formation, Ay △fHm^θ, were calculated as (-16803.95±7.74), (-15450.02± 8.28),(-15303.29±9.28), (-15215.99±7.22), (-15269.83±6.61) kJ·mol^-1 and (-1115.42±8.94), (-2477.80±9.15), (-2619.95±10.44), (-2670.17±8.22), (-2650.06±8.49)kJ·mo1^-1, respectively.