ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

 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)