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Technetium chemistry, oxidation states and species
Rulfs, Charles L.; Pacer, Richard A.; Hirsch, R. F.
Rulfs, Charles L.; Pacer, Richard A.; Hirsch, R. F.
1967-03
Citation:Rulfs, C. L., Pacer, R. A., Hirsch, R. F. (1967/03)."Technetium chemistry, oxidation states and species." Journal of Inorganic and Nuclear Chemistry 29(3): 681-691. <http://hdl.handle.net/2027.42/33360>
Abstract: Pertechnetic and perrhenic acids behave as very strong acids, Ka ~ 108. Their extensive dehydration to M2O7 in such media as 7 M sulphuric acid complicates a spectrophotometric comparison of acid strengths. Chloroform extractable TcO3Cl forms from pertechnetate in the presence of chloride ion and concentrated sulphuric acid. The (VII) state of this compound is confirmed and its spectrum described. No evidence of unusual technetium (VII) species, in aqueous media of 1 N base to 1 N acid, has been found. The red colour of concentrated aqueous HTcO4 is ascribed to a lower (VI) or (V) state. The existence in alkaline media of a technetate, TcO42-, species has been re-examined. Some (IV) and (III) state species are partially characterized, but no Tc2O3 could be isolated.
