Ruthenium complex symmetrical bridged mixed-valence

Mixed-valence mthenium(II)-ruthenium(III) complexes have been prepared. Controlled-potential oxidation of the ruthenium(II) dimer [Ru(CO)(S2CNEt2)(p-S2CNEt2)]2, in which each ruthenium carries one carbonyl, yields [Ru(CO)(S2CNEt2)(p-S2CNEt2)]2 (Eq. 128), whereby both carbonyls are bound in a cis fashion to a single metal center (288). The molecule contains a long ruthenium-ruthenium interaction [Ru-Ru 3.614(1) A] and the sulfurs bridge approximately symmetrically. The authors were not able to determine if the molecule contained separate ruthenium(II) and ruthenium(lll) centers or a delocalized state. 

---