Syntheses,characterization and thermal properties of the lanthanide complexes with 2-mercaptonicotinic acid and 1,10-phenanthroline |
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Authors: | Qi Yang Sanping Chen Shengli Gao |
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Institution: | (1) Department of Chemistry, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Northwest University, Xi’an, China |
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Abstract: | Fourteen new complexes with the general formula of Ln(Hmna)3(phen) (H2mna = 2-mercaptonicotinic acid and phen = 1,10-phenanthroline) were synthesized and characterized by elemental analyses, IR
spectra and thermogravimetric analyses. In addition, molar specific heat capacities were determined by a microcalorimeter
at 298.15 K. The IR spectra of the complexes showed that the Ln3+ coordinated with the oxygen atoms of H2mna and the nitrogen atoms of phen. The complexes decomposed directly to oxides Ln2O3, CeO2, Pr6O11, and Tb4O7 in one step. The values of molar specific heat capacities for fourteen solid complexes were plotted against the atomic numbers
of lanthanide, which presented as “tripartite effect”. It suggested a certain amount of covalent character existed in the
bond of Ln3+ and ligands, according with nephelauxetic effect of 4f electrons of rare earth ions.
The article is published in the original. |
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