H. Park, Joonhyung Cho, J. Suh
Oct 1, 1997
Citations
0
Influential Citations
9
Citations
Journal
Journal of Polymer Science Part A
Abstract
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 UO2(Sal) 3 U PEI. Upon demetalation of UO 2 (Sal) 3 U 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 E PEI was far superior to those other uranophiles.