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Protonated Tungsten Bronze (HxWO3) Acts as an Easily Regenerable Reagent for PCET Reactions
Jake O'Hara1, Hana Chrenka1, Katherine H Morrissey1
1Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055, United States.
Abstract:
In this work, protonated tungsten bronze powder (HxWO3) was synthesized by a microwave heating technique from tungsten(VI) chloride in benzyl alcohol. This material facilitates a proton-coupled electron transfer (PCET) reaction with 2,2,6,6-tetramethyl-1-piperidinyloxyl (TEMPO) in toluene, an aprotic solvent, to form TEMPOH, evidenced by UV-vis analysis of the organic product and X-ray photoelectron spectroscopy (XPS) analysis showing the oxidation of W5+ to W6+ in the remaining powder. Then, under illumination in an acidic aqueous solution, the oxidized WO3 powder reacts photochromically to regenerate HxWO3. The regenerated HxWO3 reagent remains active for further PCET reactions.
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