Journal
NEW JOURNAL OF CHEMISTRY
Volume 32, Issue 3, Pages 490-495Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b715671e
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A series off new ligands bearing three diglycolamide functions preorganized at the C-pivot and trialkylphenyl platforms was synthesized. They are very efficient extractants for Am(3+) and Eu(3+) with an up to five times relative extraction ability for Eu(3+). The distribution coefficients are up to 1000 times increased upon alkylation or arylation of the N-position of the diglycolamide moieties. The tripodal diglycolamides show a 1 : 1 metal to ligand stoichiometry as proven with three independent methods for the complexation of the 3-pentyl N-substituted diglycolamide ligand with Eu(3+) (K = 2.5 x 10(5) M(-1) in acetonitrile-water). A cage-like cryptand, containing three diglycolamide units, was prepared using a Eu(3+) templated synthesis. However, it does not exhibit improved extraction properties.
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