Objective—To synthesizeternary complex[Nd(C9H7O2)3(C12H8N2)]·H2O,study its thermochemical properties and to calculate theΔfHΘm.Methods—Ternary complex [Nd(C9 H7O2)3(C12H8N2)]·H2O(s)was synthesized with six-water neodymium chloride,1,10-phenanthroline and cinnamic acid in methanol and anhydrous ethanol solution,and then characterized by IR.A thermochemical cycle of reaction was designed in terms of the principle of thermodynamics and Hess' law.In addition,At 298.15 Kand normal pressure,the dissolution enthal...