In mixed-valence dimers the position and extent of delocalization of the odd electron depends on the metals and on the bridging and nonbridging ligands. We report here the preparation of the mixed-metal dimer [(bpy)2(Cl)OsII(pz)RuI1(NH3)5]3+(bpy is 2,2'-bipyridine; pz is pyrazine) in which the metal–ligand combinations at the two sites lead to redox potentials for the OsIII/IIand RuIII/IIcouples which are nearly of the same magnitude. However, because of a considerable difference in the sensitivity of the potentials of the two couples to solvent,4 we have been able to demonstrate that in the mixed-valence form of the dimer, intramolecular electron transfer can be induced by changes in the solvent. Perhaps more interestingly, we also find that variations in solvent appear to affect the extent of delocalization of the odd electron.
ASJC Scopus subject areas
- Colloid and Surface Chemistry