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KMID : 1059519900340060548
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Journal of the Korean Chemical Society
1990 Volume.34 No. 6 p.548 ~ p.554
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Temperature and Ligand Effects on the Eu(Ⅲ) Emission Spectra in the Aqueous Solution
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Lee In-Sook
Kim Kun
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Abstract
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Temperature effects on the fluorescence emission spectra of 0.01 M Eu(III) ion with ClO4, Cl-, NO3 were studied. Relative intensity change of hypersensitive band (5D0 → 7F2) and nonhypersensitive band (5D0 → 7F1) 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(H2O)X3+ to EuL(H2O)X-12+ complex. ΔH of Eu(H2O)X3+ to EuCl(H2O)X-12+ was roughly 15 kJ/mol and temperature independent, but ΔH of EuNO3(H2O)X-12+ was changed with temperature; -11 kJ/mol at 25℃ and 47 kJ/mol at 250℃.
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KEYWORD
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