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Issue 23, 2017
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Complexation of tetraalkyl diglycolamides with trivalent f-cations in a room temperature ionic liquid: extraction and spectroscopic investigations

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Abstract

This paper reports the complexation of a series of tetraalkyl diglycolamides (TRDGA) with trivalent f-cations in a room temperature ionic liquid, viz., 3-octyl-1-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C8mim][Tf2N]). The stability constants of TRDGA/Nd3+ complexes (where R = n-pentyl, n-hexyl, n-octyl, n-decyl and 2-ethylhexl) were determined by absorbance spectroscopy. All the DGA ligands formed a 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 those extracted in the [C8mim][Tf2N] medium from the aqueous phase were found to be identical. Fluorescence lifetime data confirmed that, in both single phase titration and biphasic solvent extraction, the complexation proceeded via replacement of water molecules from the primary coordination sphere of the metal ion. The spectroscopic data confirmed the absence of NO3 and Tf2N ions or H2O in the extracted complexes.

Graphical abstract: Complexation of tetraalkyl diglycolamides with trivalent f-cations in a room temperature ionic liquid: extraction and spectroscopic investigations

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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., 2017,46, 7584-7593
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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, 46, 7584
    DOI: 10.1039/C7DT01090G

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