Abstract
Two stable 8-quinolinolate complexes of ruthenium(II), [Ru(bpy)(Q)]ClO 4 and [Ru(tap) 2(Q)]ClO 4 [bpy = 2,2′-bipyridine, Q=8-quinolinolate anion, tap = 2-( m-tolylazo) pyridine] have been synthesized. The complexes are diamagnetic and show strong absorption near 1100 cm −1 in the IR spectra due to the presence of ClO − 4. In acetonitrile solution they behave as 1:1 electrolytes. The complexes display intense absorption bands in the visible region (400–700 nm) which are assigned to MLCT transitions. The formal potential ( E 0 298), determined cyclic voltammetrically for the ruthenium(II)-ruthenium(III) oxidation, is 0.48 V vs SCE for [Ru(bpy) 2(Q)] +. The same oxidation takes place irreversibly at 1.00 V vs SCE ( E pa value) in the case of [Ru(tap) 2(Q)] +. Reductions of the bound bpy and tap ligands are also observed.
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