Thermochemical properties of the rare earth complexes with pyromellitic acid |
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| Authors: | Lijun Wang Fei Liu Xuwu Yang Xiaoyan Wang Ruiping Liu Sa Zhao Sanping Chen |
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| Affiliation: | aKey Laboratory of Synthetic and Natural Functional Molecule Chemistry (Ministry of Education), Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Department of Chemistry, Northwest University, Xi’an 710069, PR China |
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| Abstract: | Fourteen rare earth complexes with pyromellitic acid were synthesized and characterized by means of chemical and elemental analysis, and TG–DTG. The constant-volume combustion energies of complexes, ΔcU, were measured by a precise rotating-bomb calorimeter (RBC-type II). Their standard molar enthalpies of combustion,  , and standard molar enthalpies of formation,  , were calculated at T = 298.15 K. The relationship of  and  with the atomic numbers of the elements in the lanthanide series was examined. The results show that a certain amount of covalence is present in the chemical bond between rare earth cations and the ligand. |
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| Keywords: | Rare earth complex Thermal analysis The enthalpy of combustion The enthalpy of formation Precise rotating-bomb calorimeter |
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