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Two coordinate reactions, NdCl 3·6H 2O(s) +3CCl 3COOH(s)( or TCA) =Nd(TCA) 3·3H 2O(s) +3HCl(g) +3H 2O(l) and Nd(TCA) 3·3H 2O(s) +2C 9H 7NO(s)= Nd(TCA)(C 9H 6NO) 2 (s) +2CCl 3COOH(s) +3H 2O(l), were studied by the classical solution calorimetry at 298.15K. The molar dissolution enthalpies of the reactants and the products in certain solvent (the first reaction in 1 mol·L -1 HCl, the second in a mixed solution consisting of absolute ethyl alcohol, dimethyl sulfoxide and 4 mol·L -1 HCl ) were measured by using an isoperibol calorimeter at 298.15K . From the results and other auxiliary quantities, the standard molar formation enthalpies of [Nd(TCA) 3·3H 2O,s,298.15K] and [Nd(TCA) (C 9H 6NO) 2 ,s, 298.15K] are determined as Δ fH m °[Nd(TCA) 3·3H 2O,s,298.15K]= -3053.3 kJ·mol -1 and Δ fH m° [Nd(TCA) (C 9H 6NO) 2 ,s, 298.15K] = -1355.6 kJ·mol -1 .
Two coordinate reactions, NdCl 3 · 6H 2O (s) + 3CCl 3COOH (s) (or TCA) = Nd (TCA) · 3H 2O (s) + 3HCl (g) + 3H 2O (l) 3 3H 2O (s) + 2C 9H 7NO (s) = Nd (TCA) (C 9H 6NO) 2 (s) + 2CCl 3COOH (s) + 3H 2O (l), studied by the classical solution calorimetry at 298.15 K. The molar dissolution enthalpies of the reactants and the products in certain solvent (the first reaction in 1 mol·L -1 HCl, the second in a mixed solution consisting of absolute ethyl alcohol, dimethyl sulfoxide and 4 mol·L -1 HCl ) were measured by using an isoperibol calorimeter at 298.15 K. From the results and other auxiliary quantities, the standard molar formation enthalpies of [Nd (TCA) 3 · 3H 2 O, s, 298.15 K] and [Nd (TCA) 6NO) 2, s, 298.15K] are determined as ΔfH m ° [Nd (TCA) 3 · 3H 2O, s, 298.15K] = -3053.3 kJ · mol -1 and ΔfH m ° [Nd (TCA) C 9H 6NO) 2, s, 298.15K] = -1355.6 kJ · mol -1.