Hot-Atom Chemistry of Halogens in Cobaltammine Complex Salts. I. Hot-Atom Chemistry of Bromine in Bromopentammine Cobalt Complex Salts

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Abstract
The hot-atom effect was investigated on 80mBr and 82Br resulting from (n, γ) processes in ligand bromine of bromopentammine cobalt complex salts. The fraction of radiobromine retained in ligand (ligand yield) was compared for samples irradiated in different phases, and it increased in the following order: solution, resin, solid. It is interesting to note that in the irradiation of solids of bromopentammines [Co(NH3)5Br]Br2 showed almost the same ligand yield as other salts. The hot-atoms resulting from the anions may behave in the same way as those from ligands of the complex salts. The exchange of ligand bromine in these complex salts with bromide in water was regarded as being very slow at room temperature. In the irradiation of the complex ion adsorbed on a cation exchange resin, a considerable fraction of radiobromine was trapped in the resin matrix. Treatments with either inorganic acids or a reducing agent did not remove the activity appreciably. Most of the radiobromine remaining in resin was presumed to be organically combined with the matrix.

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