Concentrated Fe(III)-nitrilotriacetate solutions: study by Raman spectroscopy and ab initio calculations
| Autor: | Loridant, Stéphane, Digne, Mathieu, Daniel, Marlène, Huard, Thierry |
|---|---|
| Přispěvatelé: | Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC) |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Fe(III) complexes concentrated aqueous solutions ab initio calculations [CHIM.CATA]Chemical Sciences/Catalysis nitrilotriacetate ligand |
| Zdroj: | Journal of Raman Spectroscopy Journal of Raman Spectroscopy, Wiley, 2007, 38, pp.44-52. ⟨10.1002/jrs⟩ |
| ISSN: | 0377-0486 1097-4555 |
| DOI: | 10.1002/jrs⟩ |
| Popis: | International audience; Fe(III)-nitrilotriacetate(NTA) aqueous solutions are used in various redox desulfurization processes. The nature of stable Fe-NTA complexes depends highly on parameters such as [Fe(III)] concentration, NTA/Fe ratio and pH value. These complexes can be characterized by potentiometric measurements or UV-vis spectroscopy, but only at rather low concentrations. Using synthesis of solids, Raman spectra of these solids and ab initio calculations, a rational determination of the nature of complexes stable in water at high iron concentrations was proposed from the position sensitivity of the main low wavenumber band to the coordination sphere of iron cations. This band was assigned to n(Fe-N) stretching vibrations from ab initio calculations. Depending on the pH and NTA/Fe ratio of the prepared solutions, different species were identified from the Raman spectra. The present methodology can be extended to other metal-ligand systems to elucidate the nature of stable complexes in aqueous solution. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text