KMID : 1059519960400010059
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Journal of the Korean Chemical Society 1996 Volume.40 No. 1 p.59 ~ p.64
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Investigation of Eu(¥²)-Polyfunctional Organic Acid Complexes by Eu(¥²) Luminescence Spectroscopy
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Lee Byoung-Ho
Shin Hyun-Sang Moon Hi-Chung
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Abstract
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The 7F0 ¡æ 5D0 excitation spectra of Eu(¥²) complexed with polyfunctional monocarboxylic acid(glycolic acid, glycine and thioglycolic acid) containing a terminal O, N and S neutral donors and propionic acid were investigated using Eu(¥²) luminescence spectroscopy. In the excitation spectra of Eu(¥²)-propionate system, the stepwise appearance of the peaks was observed at 579.0, 579.2 and 579.5 nm with increasing in the ligand-to-metal ratio, which correspond to the formation of Eu(propionate)2+, Eu(propionate)2+ and Eu(propionate)3 species. Three maximum peaks were also obtained for Eu(¥²)-glycolate, Eu(¥²)-glycinate and Eu(¥²)-thioglycolate systems and were found to be quite similar to those of Eu(¥²)-propionate system. The q values (number of coordinated water molecules of Eu(¥²) ion) obtained from the luminescence decay constants of Eu(¥²)-glycolate and Eu(¥²)-thioglycolate were 7.0 and 7.1, and compare well with 7.3 for Eu(¥²)-propionate: Each ligand units replace around two coordinated water molecules. These results show that the polyfunctional monocarboxylates behaves like the propionate for Eu(¥²) ion coordination.
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KEYWORD
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