Photochemical reactivity of [Ru II(L)(CO) 2Cl 2] and [Me 4N] [Ru II(L)(CO)Cl 3] (L = 2,2′-bipyridine or 4,4′- di(isopropoxycarbonyl)-2,2′-bipyridine) in CH 3CN and the redox properties of the resulting new complexes

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Photolysis of acetonitrile solutions of [Ru II(L)(CO) 2Cl 3] or [Me 4N][Ru II(L)(CO)Cl 3] (L= 2,2′-bipyridine or 4,4′-di (isopropoxycarbonyl-2,2′-bipyridine) leads to the successive formation of the new complexes [Ru(L)(CO)(CH 3CN)Cl 2], [Ru(L)(CH 3CN) 2Cl 2], and [Ru(L)(CH 3CN) 3Cl] + by photosubstitution processes. However, [Ru(L)(CH 3CN) 2Cl 2], unlike [Ru(L)(CO) (CH 3CN)Cl 2] and [Ru(L)(CH 3CN) 3Cl] +, cannot be obtained quantitatively with the complex having the unsubstituted 2,2′- bipyridine ligand. Moreover [Ru(L)(CH 3CN) 3Cl] + cannot be produced at a significant rate for complexes with L = 4,4′-isopropoxycarbonyl- 2,2′-bipyridine. The redox behaviour of all these compounds was studied by cyclic voltammetry at a platinum electrode, exhaustive electrolysis experiments, and UV-visible absorption spectroscopy.