Abstract
A series of non-electrolytic low-spin ruthenium(III) complexes [μ eff (in dichloromethane solution): 1.79–1.93 μ B at 298 K] have been synthesized using closely-related encapsulating Schiff-base ligands having an aliphatic nitrogen and a phenolate oxygen as donor sites. The structural behaviour of the complexes in CDCl 3 solution has been examined by 1H NMR spectroscopy utilizing paramagnetically-shifted ligand proton resonances. Cyclic voltammetric studies in dichloromethane solution at a platinum working electrode reveal the presence of a reversible-to-quasi-reversible Ru III-R II couple ( E f = −0.62 to −0.74 V) and an Ru IV-Ru III couple ( E f = 0.53–0.70 V) vs S.C.E. (saturated calomel electrode). Additionally, an Ru V-Ru IV couple ( E f/ E pa = 1.02–1.18 V) is also observed.
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