Summary
The oxidation of [RuIII(hedta)(H2O)]=(1) to its RuIV monomeric complex at a glassy carbon electrode is abserved to promote oxidation of alcohols bearing an a-hydrogen (i-PrOH benzyl alcohol,sec-phenethyl alcohol). Tertiary substitution blocks the oxidation (t-BuOH). The oxidation of the alcohols is detected by an enhancement in the current of the RuIV/III waves at potentials above 0.96V, caused by scavenging (reduction) of RuIV by the alcohols. Binuclear complexes which possess RuIV bridged by oxo to either a second RuIV or to RuIII in species of composition [LRuORuL]n−, L=hedta3−, fail to oxidize the alcohols. The terminal oxo moiety attached to RuIV is postulated to facilitate the oxidation of primary and secondary alcohols in a manner analogous to Meyer's [RuO(trpy)(bpy)]2+ catalyst. The dissociation of the (III,IV) binuclear complex into its monomers provides a pathway which increases catalytic activity at the expense of the inactive (III, IV) binuclear complex's concentration.
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Abbreviations of ligands: hedta3−=N-hydroxyethylethylenediaminetriacetate; edta4−=ethylenediaminetetraacetate; ttha6−=triethylenetetraaminehexaacetate; bpy=2,2′-bipyridine; tryp=2,2′∶6′,2″-terpyridine.
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Zhang, S., Holl, L.A. & Shepherd, R.E. Electrochemical detection of the oxidation of alcohols byN-hydroxyethylethylenediamminetriacetatoruthenate(IV). Transition Met. Chem. 17, 390–396 (1992). https://doi.org/10.1007/BF02910715
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DOI: https://doi.org/10.1007/BF02910715