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Complexation of Tetraalkyl Diglycolamides with Trivalent f-cations in a Room Temperature Ionic Liquid: Extraction and Spectroscopic Investigations

Abstract

This paper reports for the first time the complexation of a series of tetraalkyl diglycolamide (TRDGA) with trivalent f-cations in a room temperature ionic liquid, viz. 3-octyl-1-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C8mim][Tf2N]). The stability constant of TRDGA/Nd3+ complexes (where R = n-pentyl, n-hexyl, n-octyl, n-decyl and 2-ethylhexl) were determined in [C8mim][Tf2N] by absorbance spectroscopy. All the DGA ligands formed 1:3 (Nd3+/DGA) complex as the limiting species. Solvent extraction data on Am3+ and Eu3+ were obtained with the TRDGA ligands in [C8mim][Tf2N] to arrive at a correlation between their extraction behaviour and complexation constant. The nature of the complex formed in the single phase titration (in [C8mim][Tf2N]) and the complexes that are extracted in [C8mim][Tf2N] medium from aqueous phase were found to be identical. Fluorescence life-time data confirmed that, in both the cases single phase titration and biphasic solvent extraction, the complexation proceeded via replacement of water molecules from the primary coordination sphere of the metal ion. Spectroscopic data confirmed the absence of NO3-, Tf2N- ions or H2O in the complex. Attempt was made to understand the complexation behaviour of the TRDGA ligands with trivalent f-cations in molecular solvent vis-à-vis RTIL.

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Publication details

The article was received on 27 Mar 2017, accepted on 12 May 2017 and first published on 12 May 2017


Article type: Paper
DOI: 10.1039/C7DT01090G
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Complexation of Tetraalkyl Diglycolamides with Trivalent f-cations in a Room Temperature Ionic Liquid: Extraction and Spectroscopic Investigations

    S. A. Ansari, R. B. Gujar and P. K. Mohapatra, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT01090G

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