NDLI: Design, synthesis and extraction studies of a new class of conformationally constrained (N,N,N′,N′-tetraalkyl)7-oxabicyclo[2.2.1]heptane-2,3-dicarboxamides

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Sharma, Shikha Bhattachariya, Arunasis Ghosh, Sunil K. Panja, Surajit Dhami, Prem S. Gandhi, Preetam M.
Description	Author Affiliation: Sharma S ( Bio-Organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India. ghsunil@barc.gov.in.)
Abstract	A new class of conformationally constrained 7-oxabicyclo[2.2.1]heptane-2,3-dicarboxamides (OBDA) of three secondary amines was synthesized, and their extraction behavior for trivalent and tetravalent actinides in $HNO_{3}$ medium was studied. Amongst the diamides, N,N-bis-2-ethylhexyl substituted diamide showed the best results for actinide extraction. This diamide also exhibited a very low level of extraction for Sr(II) and Ru(III) which is desirable, thus providing higher selectivity for actinides. The stripping of extracted metal ions was achieved using 0.1 M oxalic acid for Pu(IV) or pH ∼ 2 solution for Am(III). Third phase formation was not observed for the OBDA ligand even for a higher concentration of Eu up to 5 g $L^{−1}$ with retention of good $D_{Eu}.$ The tridentate nature of the OBDA ligand was ascertained by studying the IR and NMR spectra of the Eu(III) complex with the ligand. The OBDA showed the formation of a mixture of mono- and di-solvated species of Eu(III) as indicated by the slope analysis method and ESI-MS. Density functional theoretical (DFT) study was carried out to determine the energy optimized structure of the free ligand and its $Am^{3+}$ complex.
ISSN	14779226
Issue Number	28
Volume Number	44
e-ISSN	13645447
Journal	Dalton Trans.
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2015-07-28
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Actinoid Series Elements Chemistry Amides Lanthanoid Series Elements Alkanes Fatty Alcohols Nitric Acid Journal Article
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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