Abstract

The chemical behavior of 115Cd recoil atoms in cadmium phthalocyanine, which was irradiated at dry ice temperature in a nuclear reactor, has been studied by the use of the daughter-tracing technique. It was found that the thermal annealing processes could be divided into two stages, the activation energies being 0·12 ± 0·05 eV for stage I and 0·40 ± 0·05 eV for stage II, respectively. By comparing with copper and zinc phthalocyanines it was suggested that the nature of the bonding between the central metal atom and the ligand in the complex was one of the most important factors in determining the chemical fate of the recoil atoms.

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