Journal
TETRAHEDRON
Volume 60, Issue 11, Pages 2509-2515Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2004.01.057
Keywords
calix[4]arenes; dendrimers; CMPO; extraction; NMR relaxation
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Calix[4]arenes substituted at the narrow or wide rim by eight carbamoylmethyl-phosphine oxide (=CMPO) functions in a dendritic manner were synthesised and studied in extraction of Eu3+ and Am3+ from aqueous nitric acid into o-nitrophenylhexyl ether. H-1 NMR relaxivity titrations for a wide rim octa-CMPO reveal the clear formation of a solvent-free 1:2 ligand/metal complex, while the wide rim tetra-CMPO formed oligomeric complexes under similar conditions. (C) 2004 Elsevier Ltd. All rights reserved.
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