Electrochemical behaviour of oligometallic sandwich complexes of cyclosiloxanolate ligands

The conductometric and voltammetric behaviour of 16 oligocyclosiloxanolate transition metal complexes in DMF is reported and discussed. The results of the conductometric measurements indicate that in DMF most of the compounds are electrolytes and the conductivity is due prevalently to the mobile (free) Na+ cation, the contribution of the large cluster anion being negligible, The cyclic voltammetric curves show only one reversible peak couple with E-p values very close to each other. These results suggest a high extent of electronic delocalisation in the cluster core of these sandwich type complexes and permit these compounds to be regarded as heteronuclear clusters of higher-valent transition metals.