Advanced
Temperature and Ligand Effects on the Eu(Ⅲ) Emission Spectra in the Aqueous Solution
Temperature and Ligand Effects on the Eu(Ⅲ) Emission Spectra in the Aqueous Solution
Journal of the Korean Chemical Society. 1990. Nov, 34(6): 548-554
  • Published : November 00, 1990
Download
PDF
Export by style
Article
Author
Metrics
Cited by
About the Authors
Lee, In Suk
Kim, Geon

Abstract
Temperature effects on the fluorescence emission spectra of 0.01 M Eu(III) ion with ClO$_4$, Cl$^-$, NO$_3$ were studied. Relative intensity change of hypersensitive band ($^5D0\; {\to}\;^7F_2$) and nonhypersensitive band ($^5D0 \;{\to}\;^7F_1$) was quite remarkable with temperature and ligand. The relative intensity change was interpreted as the change of formation constant and used to calculation the enthalpy change of $Eu(H_2O)_X^{3+}$+ to EuL(H$_2O)_{X-1}^{2+}$ complex. $\Delta{H}$ of $Eu(H_2O)_X^{3+}$ to EuCl(H$_2O)_{X-1}^{2+}$ was roughly 15 kJ/mol and temperature independent, but $\Delta{H}$ of EuNO$_3(H_2O)_{X-1}^{2+}$ was changed with temperature; -11 kJ/mol at 25$^{\circ}C$ and 47 kJ/mol at 250$^{\circ}C$.