Synthesis and Characterization of 3-(Aryl azo)-4-hydroxy- 1,2-naphthoquinone Ruthenium(III) Complexes as Catalysts for Benzyl Alcohol Oxidation

摘要

The syntheses and characterization of 3-(p-substituted phenyl azo)-4-hydroxy-l,2-naphthoquinones ligands (L1-3) and their Ru(III) complexes (Ru1-3) are carried out. The characterization was ascertained by elemental analysis, thermal analysis, spectroscopic analyses (FT-IR, 1 H NMR, UV-vis and Mass), magnetic, molar conductance, molecular calculations and electrochemical techniques. The green catalytic conversion of some benzyl alcohols to benzoic acid derivatives was success- fully achieved by using these complexes in an aqueous KOH with K2S2O8 as co-oxidant; with high yields by using Ru3 complex. Computational modeling was carried out to predict the structural geometry, magnetic characters and the electron donor/acceptor functions of the prepared complexes along with experimental results. The mechanism of benzyl alcohol oxidation was developed through an orange ruthenate- persulfate reagent. The oxidation capacities of the ruthenium complexes were better than the other catalysts reported. The present results are useful to oxidize benzyl alcohols at an industrial scale with a good economy.