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  • 1 Cátedra de Química Inorgánica Facultad de Química CC 1157 Montevideo Uruguay
  • 2 Universidad de La Laguna Departamento de Química Inorgánica 38204 La Laguna Tenerife, Canary Islands Spain
  • 3 Universidad de La Laguna Departamento de Química-Física 38204 La Laguna Tenerife, Canary Islands Spain
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Abstract  

The heavy use of99mTc in nuclear medicine and the recent development of188Re radiopharmaceuticals have encouraged the comparative study of Tc and Re coordination compounds. In this work, the electrochemistry of [MVO2 (amine)2]+ (M=Tc, Re; amine = ethylenediamine, 1,3-diaminopropane, diethylenetriamine, triethylenetetramine) complexes is studied by cyclic voltammetry and the results are compared. The voltammograms of these compounds, obtained at different pH values, show that [ReO2(amine)2]+ cations are thermodynamically stable even when protonated. On the other hand, analogous Tc compounds are not so stable and easily decompose if existing as [TcO(OH) (amine)2]2+.