Sequestering uranium from seawater: binding strength and modes of uranyl complexes with glutarimidedioxime.
Sequestering uranium from seawater: binding strength and modes of uranyl complexes with glutarimidedioxime.
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DOI：
10.1039/c2dt30978e
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发表时间：
2012-09
影响因子：
4
通讯作者：
G. Tian;S. Teat;Zhiyong Zhang;L. Rao
中科院分区：
文献类型：
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作者：
G. Tian;S. Teat;Zhiyong Zhang;L. Rao
戊二酰亚胺二肟（H（2）A）是一种环酰亚胺二肟配体，它与UO（2）（2+）形成强的三齿配合物，在海水中具有螯合铀的作用。用电位法和微量热法测定了五种铀（VI）配合物的稳定常数和络合速率常数。测定了配合物UO（2）（HA）（2）·H（2）O的晶体结构。肟基质子的重排（-CH=N-OH）和酰亚胺基的去质子化（-CH-NH-CH-）导致在配体（-O-N-C-N-C-N-O-）上具有离域电子密度的共轭系统，该配体通过其赤道面与UO（2）（2+）配位。
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.