Details

Autor(en) / Beteiligte

• Wilcox, Bruce E
• Deutsch, Edward

Titel

Technetium electrochemistry. 7. Electrochemical and spectroelectrochemical studies on technetium(III) and -(II) complexes containing polypyridyl ligands

Ist Teil von

• Inorganic chemistry, 1991-02, Vol.30 (4), p.688-693

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

1991

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The redox properties of a series of technetium(III/II) complexes of the general formula cis(X), trans(P)-(Tc{sup III/II}X{sub 2}(PR{sub w}R{prime}){sub 2}L){sup 10+}, where X = Cl or Br, PR{sub 2}R{prime} = dimethylphenylphosphine or ethyldiphenylphosphine, and L = 2,2{prime}-bipyridine (bpy), 4,4{prime}-dimethyl-2,2{prime}-bipyridine (Me{sub 2}bpy), or 1,10-phenanthroline (phen), were investigated in 0.1 M TEAP/acetonitrile by cyclic voltammetry at a platinum-disk electrode. These complexes exhibit diffusion-controlled, 1-equiv Tc(IV)/Tc(III) redox couples and also Tc(III)/Tc(II) redox couples. Spectropotentiostatic experiments on three complexes of this class in 0.5 M TEAP/DMF confirm the 1-equiv character of the Tc(III)/Tc(II) couple. The electrochemical behavior of Tc(II) complexes of the general formula trans(P)-(TcX(PR{sub 2}R{prime}){sub 2}terpy){sup +}, terpy = 2,2{prime}:6{prime},2{double prime}-terpyridine, was also investigated under the same conditions as above. These complexes exhibit diffusion-controlled, 1-equiv Tc(III)/Tc(II) redox couples and Tc(II)/Tc(I) redox couples. Spectropotentiostatic experiments on trans(P)-(TcCl(PMe{sub 2}Ph){sub 2}terpy){sup +} confirm the 1-equiv character of the Tc(III)/Tc(II) couple but show that the Tc(II)/Tc(I) couple is not reversible on the spectropotentiostatic time scale.