Europium(III) complexes of polyfunctional carboxylic acids: Luminescence probes of possible binding sites in fulvic acid
Journal Article
·
· Journal of Colloid and Interface Science
- Korea Advanced Inst. of Science and Technology, Taejon (Korea, Republic of). Dept. of Chemistry
- Korea Atomic Energy Research Inst., Taejon (Korea, Republic of)
The {sup 7}F{sub 0} {r_arrow} {sup 5}D{sub 0} excitation spectra of Eu(III) complexed with polyfunctional dicarboxylic acid containing neutral O, N, and S donors were investigated using Eu(III) luminescence spectroscopy. Three distinct peaks are seen in the excitation spectra in the Eu(III)-diglycolic acid (ODA) and Eu(III)-iminodiacetic acid (IMDA) systems showing the formation of three species, where each tridentate ODA {sup 2{minus}} and IMDA{sup 2{minus}} displace approximately three coordinated water molecules; however, the central S donor of Eu(III)-thiodiglycolate and 2,5-thiophenedicarboxylate are shown to be poor chelators for free Eu{sup 3+} ions. The neutral O and N donors in combination with neighboring carboxylates may form strong metal chelation sites on fulvic acid.
- Sponsoring Organization:
- Korea Science and Engineering Foundation (Korea, Republic of)
- OSTI ID:
- 483817
- Journal Information:
- Journal of Colloid and Interface Science, Journal Name: Journal of Colloid and Interface Science Journal Issue: 2 Vol. 188; ISSN 0021-9797; ISSN JCISA5
- Country of Publication:
- United States
- Language:
- English
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