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Complexation of 2-thenoyltrifluoroacetone (HTTA) with trivalent f-cations in an ionic liquid: solvent extraction and spectroscopy studies

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Abstract

The complexation of 2-thenoyltrifluoroacetone (HTTA) with trivalent lanthanides was studied in a room temperature ionic liquid, viz. 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (C4mim·Tf2N) by liquid–liquid extraction, absorption spectroscopy and time-resolved fluorescence spectroscopy. The metal ion distribution data indicated the extraction of anionic species of the type Ln(TTA)4, where the charge balance of the C4mim·Tf2N phase is maintained by the transfer of one Tf2N anion into the aqueous phase. Spectrophotometric titration of Nd3+ with HTTA indicated that the latter existed predominantly as the keto form in C4mim·Tf2N and did not form a complex with the metal ion. On the other hand, it formed complexes when TTA salt was used where it predominantly existed in the enol form. Titration of Nd3+ with TTA confirmed the formation of Nd(TTA)2+, Nd(TTA)2+, Nd(TTA)3° and Nd(TTA)4 species with the stability constant (log β) values of 5.82, 10.6, 14.5 and 17.8, respectively. Fluorescence measurements confirmed that the fully hydrated aqua Eu3+ cation in C4mim·Tf2N was completely dehydrated upon complexation with TTA. Based on spectroscopic evidence, it was deduced that TTA formed an 8 coordinated [Eu·(TTA)4] anionic complex in C4mim·Tf2N.

Graphical abstract: Complexation of 2-thenoyltrifluoroacetone (HTTA) with trivalent f-cations in an ionic liquid: solvent extraction and spectroscopy studies

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Publication details

The article was received on 18 Jun 2019, accepted on 05 Aug 2019 and first published on 06 Aug 2019


Article type: Paper
DOI: 10.1039/C9NJ03177D
New J. Chem., 2019, Advance Article

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    Complexation of 2-thenoyltrifluoroacetone (HTTA) with trivalent f-cations in an ionic liquid: solvent extraction and spectroscopy studies

    R. B. Gujar, P. K. Verma, S. A. Ansari and P. K. Mohapatra, New J. Chem., 2019, Advance Article , DOI: 10.1039/C9NJ03177D

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