โ Scribed by Tristano Boschi; Gino Bontempelli; Gian-Antonio Mazzocchin
No coin nor oath required. For personal study only.
The reaction of [RuTPP(CO)] (TPP = meso-tetraphenyl porphinate dianion) with several monodentate ligands L (L = t-butyl isocyanide, triphenylphosphine, dimethylphenylphosphine. triethylphosphine, trimethylphosphite) yields novel ruthenium(H) derivatives of formula [Ru(TPP)L, ] , characterized by their visible, i.r. and ' H n.m.r. spectra. The electrochemical behaviour of these complexes in a CH,CN-benzene 50% (v/v) mixture with TBAP or TBA TFB as supporting electrolyte, has been studied by employing cyclic voltammetry and controlled potential electrolysis. Both the first anodic and the first cathodic process observed involves an electron transfer at the central metal yielding ruthenium(I.I) and ruthenium(I) derivatives. The potentials related to these processes are strongly dependent on the nature of the ligand L. The influence of the n-bonding abilities of the ligand on the stabilization of the different oxidation states is discussed.
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