The recoil reaction of technetium in mer- and fac-tris/benzoylacetonato/ruthenium/III/

Abstract

The recoil reactions of technetium produced by¹⁰⁰Ru/γ, p/^99mTc reaction were studied in γ-irradiated mer- and fac-Ru/ba/₃ targets. Yields of mer- and fac-Tc/ba/₃ were determined by column chromatographic separation developed in our previous work. In the initial recoil reaction yields mer-form of Tc/ba/₃ was much more abundant than fac-form in the mer-Ru/ba/₃, but the reverse held good in the fac-Ru/ba/₃ showing selectivity in recoil replacement reactions in geometrical isomers. In the annealing reactions, however, such selectivity disappeared and the fac/mer ratio for the annealed portions could be explained by the following mixed mechanisms of ligand incorporation.

$$\begin{gathered} Tc/ba/_2^ + + ba^ - \to Tc/ba/_3 \hfill \\ Tc/ba/^{2 + } orTc^{3 + } + xba \to Tc/ba/_3 \hfill \\ /x = 2or3/. \hfill \\ \end{gathered} $$