Abstract
Two stable monopicolinate complexes of ruthenium(II), [Ru(bipy)2(pic)]ClO4 and [Ru(pap)2(pic)]ClO4 [bipy = 2,2′-bipyridine, pic = picolinate anion, pap = 2-(phenylazo)-pyridine], were prepared and characterized. The complexes are diamagnetic and behave as 1:1 electrolytes in MeCN solution. In the i.r. spectra, they show characteristic vibrations of bipy or pap, pic and ClO inf4 p− . In MeCN solution, both complexes display three intense absorption bands in the visible region, which have been assigned to metal-to-ligand charge-transfer transitions. Each complex shows a reversible ruthenium(II)-ruthenium(III) oxidation in MeCN, the formal potential (E inf298 p0 ) being 0.75 V versus a saturated calomel reference electrode (SCE) for [Ru-(bipy)2(pic)]+ and 1.44 V versus SCE for [Ru(pap)2(pic)]+. Multiple reductions of the coordinated bipy and pap ligands have also been observed.
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