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Binding of uranyl ion by poly(ethylenimine) containing a salicylate derivative

✍ Scribed by Hyung Soon Park; Joo Hee Cho; Junghun Suh

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
198 KB
Volume
35
Category
Article
ISSN
0887-624X

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✦ Synopsis

Three molecules of 5-(bromoacetyl)salicylate ( 1) complexed to uranyl (UO 2/ 2 ) ion were crosslinked with branchy poly(ethylenimine) (PEI) in DMSO by alkylation of amino groups of PEI with 1, leading to the formation of UO 2 (Sal) U 3 PEI. Upon demetalation of UO 2 (Sal) U 3 PEI with HCl, apo(Sal) U 3 PEI was obtained. Based on the pH dependence of log K f for UO 2 (Sal) U 3 PEI, it was concluded that each uranyl binding site in UO 2 (Sal) U 3 PEI or apo(Sal) U 3 PEI contains three salicylate moieties. In terms of the equilibrium constant for formation of the uranyl complex, apo(Sal) U 3 PEI was found to be comparable to or better than the previously reported effective uranophiles. In terms of the rates for the formation of the uranyl complex, however, apo(Sal) U 3 PEI was far superior to those other uranophiles.

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