| Autor: |
Wang, Ye, Zhao, Qing-Qing, Ren, Ning, Zhang, Jian-Jun, Geng, Li-Na, Wang, Shu-Ping |
| Předmět: |
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| Zdroj: |
Journal of Thermal Analysis & Calorimetry; Dec2016, Vol. 126 Issue 3, p1703-1712, 10p |
| Abstrakt: |
Two novel mononuclear lanthanide complexes, [Ln(2,4-DClBA)(terpy)(HO)]·HO (Ln = Dy(1), Er(2)); 2,4-DClBA: 2,4-dichlorobenzoate; terpy: 2,2′:6′,2″-terpyridine; have been synthesized and characterized by single-crystal and powder X-ray diffraction. The results reveal that complexes 1-2 are isomorphous, and each Ln ion is nine coordinated adopting a distorted monocapped square antiprismatic molecular geometry. Mononuclear complexes 1-2 are stitched together via Cl- π and hydrogen bonding interactions to form the 1D, 2D, 3D supramolecular structures, which the 3D is rarely observed. Thermal decomposition mechanism is determined by TG/DSC-FTIR, and the 3D stacked plots for the FTIR spectra of the evolved gases were recorded. Heat capacities of complexes 1-2 were measured, and the derived thermodynamic functions ( H − H ), ( S − S ) and ( G − G ) of the complexes relative to the standard reference temperature 298.15 K were obtained. The activation energy E values of the first decomposition stage for title complexes were calculated by integral isoconversional nonlinear (NL-INT) and Starink methods. Complex 1 shows the characteristic emission of Dy with strong yellow emission. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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