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Chemische Effekte des isomeren Überganges von Brom-80m in Pentamminkobalt(III)-und Bisäthylendiaminkobalt(III)-bromiden

Chemical effects of the isomeric transition of80mBr in pentammincobalt(III) and bisethylenediaminecobalt(III) bromides

  • Anorganische, Struktur- und Physikalische Chemie
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Abstract

The chemical effects of the isomeric transition of80mBr were investigated at temperatures of−78° C and−196° C with80mBr-labeled samples of [Co(NH3)5 X]Br3.2 nH2O and [Co(en)2 X 2']Br3.1 nH2O (X=NH3, NCS, NO2, OH2, ONO, ONO2, F, Cl, Br, I, andX'=en, NH3, NCS, Cl, Br). The ligand yield of80Br in the complexes was found to increase with the decrease in the frequency of the maximum in the first absorption band of [Co(NH3)5 X] and [Co(en)2 X 2']. In other words, less stable ligands were more easily replaced by radiobromine as a consequence of isomeric transition in solid complexes.

Zusammenfassung

Die chemischen Effekte des isomeren Überganges von80mBr wurden bei Temperaturen von−78° C und−196° C an mit80mBr markierten Proben von [Co(NH3)5 X]Br3.2 nH2O und [Co(en)2 X 2']Br3.1 nH2O untersucht (X=NH3, NCS, NO2, OH2, ONO, ONO2, F, Cl, Br, I, undX'=en, NH3, NCS, Cl, Br). Es zeigte sich, daß die Ligandenausbeute an80Br, in den Komplexen mit abnehmender Frequenz des Maximums in der ersten Absorptionsbande des [Co(NH3)5 X] und des [Co(en)2 X 2'] zunimmt. Mit anderen Worten, weniger stabile, Liganden werden leichter von Radiobrom ersetzt als Folge des isomeren Überganges in festen Komplexen.

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Herrn Prof. Dr.E. Broda zum 60. Geburtstag gewidmet.

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Ambe, S., Tominaga, T. & Saito, N. Chemische Effekte des isomeren Überganges von Brom-80m in Pentamminkobalt(III)-und Bisäthylendiaminkobalt(III)-bromiden. Monatshefte für Chemie 102, 538–544 (1971). https://doi.org/10.1007/BF00909350

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  • DOI: https://doi.org/10.1007/BF00909350

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