Specific Sequestering Agents for the Actinides. 29. Stability of the Thorium(IV) Complexes of Desferrioxamine B (DFO) and Three Octadentate Catecholate or Hydroxypyridinonate DFO Derivatives: DFOMTA,

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• 作者：Donald W. Whisenhunt ; Jr. ; Mary P. Neu ; Zhiguo Hou ; Jide Xu ; Darleane C. Hoffman ; and Kenneth N. Raymond
• 刊名：Inorganic Chemistry
• 出版年：1996
• 出版时间：July 3, 1996
• 年：1996
• 卷：35
• 期：14
• 页码：4128 - 4136
• 全文大小：217K
• 年卷期：v.35,no.14(July 3, 1996)
• ISSN：1520-510X

文摘

The metal complex stability constants of Th(IV)with desferrioxamine B (DFO) and three octadentatederivatives[N-(2,3-dihydroxy-4-carboxybenzoyl)desferrioxamine B(DFOCAMC),N-(1,2-dihydro-1-hydroxy-2-oxopyridin-6-yl)carbonyl)desferrioxamine B (DFO-1,2-HOPO) andN-(2,3-dihydroxy-4-(methylamido)benzoyl)desferrioxamineB (DFOMTA)] have been determined. The formation constant of thePu(IV)/DFOMTA complex has also beendetermined, and the formation constants have been estimated for theother Pu(IV) complexes of octadentate DFOderivatives. The DFO derivatives form 1:1 complexes withTh(IV) in aqueous solution. The solutionchemistryof the Th(IV) complexes has been studied by spectrophotometric,potentiometric and proton NMR titrations.The Th(IV) formation constants are as follows (logK_f values and esd's): DFO, 26.6(1);DFOMTA, 38.55(5);DFOCAMC, 37.2(3); DFO-1,2-HOPO, 33.7(4). ThePu(IV)/DFOMTA formation constant, determined bycompetitive spectrophotometric titration is (logK_f value) 41.7(2). The estimation ofthe other Pu(IV) formationconstants are as follows (log K_f values):DFOCAMC, 40.4; DFO-1,2-HOPO, 36.9. The selectivity of DFOandthe three derivatives for actinide(IV) ions isdiscussed.