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 Chemical stabilization of daughter 99mTc after the β-decay in chelate systems with molybdenyl-(99Mo)

V. Mikulaj, P. Rajec, and V. Faberová

Department of Nuclear Chemistry, Faculty of Natural Sciences, Komenský University, 801 00 Bratislava

 

Abstract:  Chemical consequences of the  β-decay of 99Mo in molecules of the type M0O2L2 (L is a chelating ligand) were studied. 8-Hydroxy quinoline. α-benzoinoxime, and N-benzoyl-N-phenylhydroxylamině were used as chelating agents. Kinetics of extraction of 99Mo(VI) —99mTc with chloroform solutions of chelating agents from aqueous HCl or H2SO4, kinetics of stripping of chelates from chloroform solutions and extractability of Tc(VII), Tc(V), and Tc(IV) were investigated. According to the results, daughter 99mТс is stabilized in oxidation degree V in high yields (80—100%). 99mTc(V) is in general unstable and its stability in the chloroform — water two-phase system depends on its ability to form chelates with chelating agents. The formation of 99mTc(V) is explained by preservation of the metal —oxygen bonds which are not much affected by phenomena accompanying the  β-decay. The notable stabilizing effect on 99mTc(V) oxocation is exhibited mainly by 8-hydroxyquinoline and a-benzoinoxime. The former stabilized daughter 99mTc as a chelate of the assumed composition ТсО2Ох. Its yield (90—100%) was only slightly dependent on the aqueous phase composition.

Full paper in Portable Document Format: 281a37.pdf

 

Chemical Papers 28 (1) 37–46 (1974)

Tuesday, May 21, 2024

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