The Oxidation Catalyst Por Ru CO L

A very prominent class of metalloporphyrins are the tetra(aryl)porphyrin ruthenium carbonyl complexes [(Aryl)4Por)Ru(CO)(L)] (L = solvent) that, in 

Thorough spectroscopic investigation of the first oxidised states using UV-Vis absorption and EPR spectroscopy lead to the assignment of mainly porphyrin-centred oxidations. 87a,b,88a,b,c,s9 typical UV- 

The species generated during the second oxidation were not studied so far, 

However, the interpretation of Ru(I) species being the products of the transformation is not very plausible, since the CO-stretching frequency of the resulting species is closer to the parent complex than the primary radical anions. Another study revealed that the radical anionic [(TPP)Ru(CO)(THF)] readily undergoes formation of the corresponding chlorine complex in the presence of MeL Such electrophilic attack might also be the reason for the above-described transformations in protic or highly polar media. 

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