Inner and outer sphere complexation between europium(III) and glycine in aqueous methanol

Inner and outer sphere complexation between europium(III) and glycine in aqueous methanol

The complexation between Eu(III) and glycine in water and aqueous methanol was studied by UV-visible spectroscopy. Substantial increases in the extent of complexation occur with increasing methanol mole fraction. Changes in the signs of the complexation enthalpy and entropy with increasing organic s...

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Veröffentlicht in:Journal of alloys and compounds 1995-07, Vol.225 (1), p.291-294
Hauptverfasser: Silber, Herbert B., Campbell, Robert L., Nguyen, Nhi, Parker, Tammy, Sibley, Scott P.
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Aqueous methanol
Europium
Glycine
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container_end_page 294
container_issue 1
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container_title Journal of alloys and compounds
container_volume 225
creator Silber, Herbert B.
Campbell, Robert L.
Nguyen, Nhi
Parker, Tammy
Sibley, Scott P.
description The complexation between Eu(III) and glycine in water and aqueous methanol was studied by UV-visible spectroscopy. Substantial increases in the extent of complexation occur with increasing methanol mole fraction. Changes in the signs of the complexation enthalpy and entropy with increasing organic solvent character were interpreted in terms of increasing inner sphere complexation, coupled to the formation of outer sphere complexes, which were not present to a measurable extent in aqueous solutions. Only 1:1 complexes were found above 10% water composition, whereas a bis(glycinato) complex forms at lower water percentages.
doi_str_mv 10.1016/0925-8388(94)07101-2
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subjects Aqueous methanol
Europium
Glycine
title Inner and outer sphere complexation between europium(III) and glycine in aqueous methanol
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