THE RADIOCHEMISTRY OF PLUTONIUM - Sciencemadness.org

TABLE IV- 9. Ionic Potential of Plutonium in Various Oxidatioh States*
Cation Ionic radius (~) Charge Ionic potential
PU+4 , 0.90 4+ 4.44
PU+3 1.03 3+ 2.91
+2
PU02 0.81 2+ 2.47
PU02+ 0.87 1+ 1.15
*After Gel! man et al. 3
The relative tendency of Pu ions to form complexes then is
Pu(IV) > Pu(HI) > Pu(VI) > Pu(V)
Gel, ma & alt 3 show that the anionic ligand has some effect on this series.
For example, the positions of Pu(HI) and Pu(VI) are interchanged in the case of onlate
complexes.
Singly charged anions form weaker complexes with actinides generally than do
multiply charged anions. The order of complex forming ability with some anions is
CO; > C20; > SO”; > F-> NO; > Cl- > C1O; .
Tables IV- 10, IW - 11, and IV-12 list available stability constants for complexes of
Pu(III), Pu(l_V), Pu(V), and Pu(VI), respectively, which are based on the review of
Gel! man ~. 3 The chemistry of complex compounds and ions of the actinides was
97
also reviewed by Comyns. Table IV- 13 lists stability constants for some complexes
of several actinides for comparison.
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