SUBSTITUTION-REACTIONS OF TECHNETIUM COMPLEXES

In this review substitution reactions of a variety of technetium compl exes are described in comparison with the corresponding rhenium comple xes. Although both technetium and rhenium complexes are substitution-i nert, technetium complexes in dissociative processes generally react f aster than corresponding rhenium complexes. On the other hand, in a ra ther exceptional case with a small ratio of the rate constants k(Tc)/k (Re), the reaction is considered to proceed via an associative mechani sm.