Abstract
The reduction of pertechnetate by 6 M HBr takes place in two steps: (i) Tc(VII) → Tc(V) and (ii) Tc(V) → Tc(IV). The kinetics of both reactions were studied. The first step corresponds to a pseudo first order reaction. The second step of the reduction appears to be a combination of a first order with a zero order process. The same Tc(V) species was formed when the TcO 4 − was reduced with either 8.7 M or 6 M HBr. The spectrophotometric characteristics of this species were comparable to those of Rb + and Cs + salts of [TcOBr 5] 2−.
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