Voltammetric behaviour of technetium99 complexes with π-acceptor ligands in aprotic medium. II. Reduction of TcCl3(PMe2Ph)3 and of TcCl4(PMe2Ph)2

The electrode reduction of the technetium 99 phosphine complexes TcCl 3 (PMe 2 Ph) 3 and TcCl 4 (PMe 2 Ph) 2 has been studied in acetonitrile solvent by electroanalytical techniques. The electrode processes, as well as the involved chemical equilibria, have been studied. Technetium(II) and technetium(I) phosphine complexes have been obtained by reducing TcCl 3 (PMe 2 Ph) 3 at different potential values. The voltammetric behaviour of these compounds of technetium in low oxidation states has been also reported. TcCl 4 (PMe 2 Ph) 2 undergoes an one-electron reduction giving rise to TcCl 3 (PMe 2 Ph) 3 as the main product.