Abstract
Protonation of water-soluble e-dimalonate[C 60]fullerene (L 4−) was investigated using UV spectrophotometry and data analyzed using a general least-squares minimization approach. The protonation constants determined were (L 4−+ rH +⇔LH r r−4 , log * β 01 r ; log * β 011=6.19±0.02; log * β 012=10.57±0.01; log * β 013=13.68±0.02; log * β 014=15.85±0.02; 25 °C). Complex equilibria study proved the formation of UO 2LH − and (UO 2) 2L complexes ( pUO 2 2+ + qL 4−+ rH +⇔(UO 2) p L q H r 2 p−4 q + r , log * β pqr ; log * β 111=11.0±0.2; log * β 210=14.35±0.09; 25 °C). The stability constant for the binding of the first uranyl ion with the dimalonate fullerene ligand is log β 11(ML) 4.81 and the second one log K 21 (ML+M=M 2L)=3.35, thus, uranyl complexation with the second malonate is much lower. The first value (4.81) is near to log K 1=4.88 for uranyl–malonate 1:1 complex.
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