Gadolinium Complex for the Catch and Release of Phosphate from Water
| Autor: | Jarrett P. Mansergh, Tuo Gao, Sarah M. Harris, Tran B. Swanholm, Jamie T. Nguyen, Sylvie Pailloux, Mark J. Dresel, Valérie C. Pierre |
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| Rok vydání: | 2017 |
| Předmět: |
Lanthanide
Tris 010405 organic chemistry Ligand Metal ions in aqueous solution Gadolinium Inorganic chemistry chemistry.chemical_element Water General Chemistry 010402 general chemistry Phosphate Ligands 01 natural sciences Lanthanoid Series Elements 0104 chemical sciences Phosphates chemistry.chemical_compound chemistry Environmental Chemistry Selectivity Ternary complex |
| Zdroj: | Environmental sciencetechnology. 51(8) |
| ISSN: | 1520-5851 |
| Popis: | The ability of complexes of hard and labile metal ions with one or more open coordination sites to capture phosphates with high affinity and selectivity directly in water at neutral pH and release them under acidic conditions is evaluated with Gadolinium- 2,2',2''-(((nitrilotris(ethane-2,1-diyl))tris(azanediyl))tris(carbonyl))tris(4-oxo-4H-pyran-3-olate) (Gd-TREN-MAM). This model lanthanide complex has two open coordination sites that, at neutral pH, are filled with water molecules. In water at neutral pH, Gd-TREN-MAM binds phosphate with high affinity (Ka = 1.3 × 104) via the formation of a ternary complex in which one phosphate replaces both inner-sphere water molecules. The formation of this complex is highly pH-dependent; the phosphate is completely released from Gd-TREN-MAM below pH 2. Because the GdIII ion remains complexed by its ligand, even under strong acidic conditions, Gd-TREN-MAM can be used at least 10 times in a pH-based recycling scheme that enables the catch and release of one phosphate p... |
| Databáze: | OpenAIRE |
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