Title: Pentacopper(II) complexes of alpha-aminohydroxamic acids: uranyl-induced conversion of a 12-metallacrown-4 to a 15-metallacrown-5
Authors: Parac-Vogt, Tatjana
Pacco, Antoine
Görller-Walrand, Christiane
Binnemans, Koen # ×
Issue Date: 2005
Publisher: Elsevier science inc
Series Title: Journal of inorganic biochemistry vol:99 issue:2 pages:497-504
Abstract: Effects of uranyl on the pentacopper(II) complexes of alpha-leucinehydroxamic acid and alpha-tyrosinehydroxamic acid were studied in water and methanol by means of electrospray ionisation mass spectrometry (ES-MS), absorption spectrophotometry, circular dichroism spectroscopy and proton NMR spectroscopy. All the measurements were consistent with the complete conversion of a 12-metallacrown-4 to a 15-metallacrown-5 upon addition of one equivalent of the uranyl ion. The uranyl ion is accommodated in the cavity formed by five copper(II) ions and five alpha-aminohydroxamate ligands. The 15-metallacrown-5 inclusion complexes have a high affinity for the uranyl ion. Competition studies showed that even in the presence of a large excess of calcium(II), the 15-metallacrown-5 remained stable, and no exchange reactions between calcium(II) and uranyl were observed. Extraction of uranyl from the 15-metallacrown-5 was also not detected in the presence of a large excess of 18-crown-6. Trivalent lanthanide ions can be partially sequestered by the 15-metallacrown-5, however, even these trivalent ions are displaced by uranyl.
ISSN: 0162-0134
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Design and Synthesis
Chemistry - miscellaneous
× corresponding author
# (joint) last author

Files in This Item:
File Status SizeFormat
130uranylMC.pdf Published 451KbAdobe PDFView/Open


All items in Lirias are protected by copyright, with all rights reserved.

© Web of science