Sequestering uranium from seawater: binding strength and modes of uranyl complexes with glutarimidedioxime
Guoxin TianChemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., Berkeley, California 94720, USASimon J. TeatAdvanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., Berkeley, California 94720, USAZhiyong ZhangStanford Nanofabrication Facility, Stanford University, Stanford, California 94305, USALinfeng RaoChemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., Berkeley, California 94720, USA
2012en
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Glutarimidedioxime (H(2)A), a cyclic imide dioxime ligand that has implications in sequestering uranium from seawater, forms strong tridentate complexes with UO(2)(2+). The stability constants and the enthalpies of complexation for five U(VI) complexes were measured by potentiometry and microcalorimetry. The crystal structure of the 1 : 2 metal-ligand complex, UO(2)(HA)(2)·H(2)O, was determined. The re-arrangement of the protons of the oxime groups (-CH=N-OH) and the deprotonation of the imide group (-CH-NH-CH-) results in a conjugated system with delocalized electron density on the ligand (-O-N-C-N-C-N-O-) that coordinates to UO(2)(2+)via its equatorial plane.
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