Temperature and Ligand Effects on the Eu(Ⅲ) Emission Spectra in the Aqueous Solution

수용액에서의 Eu(Ⅲ) 착물의 형광스펙트럼에 영향을 미치는 온도 및 리간드 효과에 관한 연구

  • 이인숙 (고려대학교 이과대학 화학과) ;
  • 김건 (고려대학교 이과대학 화학과)
  • Published : 19901100

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$^{\circ}C$.

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References

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