AI Article Synopsis
- The study investigated how uranyl ions interact with pentacopper(II) complexes of alpha-leucinehydroxamic and alpha-tyrosinehydroxamic acids using various spectroscopic techniques.
- The results showed that adding uranyl ions transforms a 12-metallacrown-4 complex into a more stable 15-metallacrown-5 complex, which effectively accommodates uranyl ions within its structure.
- Despite the presence of competing ions like calcium(II) and 18-crown-6, the 15-metallacrown-5 complex demonstrated strong affinity for uranyl and did not undergo exchange reactions with these other ions.
Article 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.
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| http://dx.doi.org/10.1016/j.jinorgbio.2004.10.023 | DOI Listing |
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