Abstract
The catalytic activity of a series of bis-coordi- nated oxidovanadium(IV) complexes with 2-(4,5-diphenyl- 1H-imidazol-2-yl)-4R-phenol ligands (R = NO2, Br, H, MeO) was investigated for the oxidation of thioanisole by hydrogen peroxide in acetonitrile at 25C. The substituent groups had a significant effect on the catalytic activity and followed the order NO2 ( Br ( H ( MeO, with the nitro (NO2) derivative achieving (99% conversion after 10 min while the methoxy (MeO) derivative yielded the same result in 60 min. The nitro- and methoxy-substituted homogeneous catalysts were incorporated into polystyrene and electrospun to form nonwoven mats with fiber diam- eters in the range 0.33-1.98 lm. These vanadium incor- porated fibers were subjected to a continuous flow system at a flow rate of 1 mL/h for the oxidation of thioanisole and the nitro-substituted catalyst showed excellent catalytic activity with conversions dropping from 99 to 93% in the 10th fraction while the drop was down to 88% for the methoxy-substituted catalyst.
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