Abstract
A new ternary solid complex of samarium chloride hexahydrate with m-methoxybenzoic acid and 1,10-phenanthroline, [Sm(m-MOBA)3phen]2 (m-MOBA: m-methoxybenzoic; phen: 1,10-phenanthroline), was synthesized and characterized by elemental analysis, IR spectra, UV spectra, molar conductance, and thermogravimetric analysis. The dissolution enthalpies of SmCl3·6H2O (s), m-HMOBA(s), phen·H2O (s), and [Sm(m-MOBA)3phen]2(s) in the calorimetric solvent (VDMF:VCYC:VHCl = 2:1:2) were determined by an advanced solution-reaction isoperibol calorimeter at 298.15 K, respectively. The standard molar enthalpy of reaction was determined to be \({\Delta_{\rm r} H_{\rm m}^\theta =(233.97 \pm 1.15)\,{\rm kJ}\,{\cdot}\,{\rm mol}^{-1}}\). In accordance with Hess’ law, the standard molar enthalpy of formation of the title complex [Sm(m-MOBA)3phen]2(s) was estimated to be −(5054.6 ± 9.5) kJ · mol−1.
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