Sequestering uranium from seawater: binding strength and modes of uranyl complexes with glutarimidedioxime | Zendy

Guoxin Tian | Zendy; Simon J. Teat | Zendy; Zhiyong Zhang | Zendy; Linfeng Rao | Zendy

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Sequestering uranium from seawater: binding strength and modes of uranyl complexes with glutarimidedioxime

Author(s) -

Guoxin Tian,

Simon J. Teat,

Zhiyong Zhang,

Linfeng Rao

Publication year - 2012

Publication title -

dalton transactions

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.98

H-Index - 184

eISSN - 1477-9234

pISSN - 1477-9226

DOI - 10.1039/c2dt30978e

Subject(s) - chemistry , deprotonation , uranyl , uranium , ligand (biochemistry) , imide , delocalized electron , inorganic chemistry , metal , crystallography , crystal structure , isostructural , polymer chemistry , organic chemistry , ion , materials science , biochemistry , receptor , metallurgy

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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