Electrochromism of Methylviologen (Paraquat)

Paraquat (Methylviologen): Its Interference with Primary Photochemical Reactions

Paraquat (methylviologen: l,l'-dimethyl-4,4'bipyridinium) has been used widely as a herbicide for some years. Methylviologen (MV) has also been known as an extremely electronegative artifi­ cial electron acceptor, and used in laboratories for the studies of biological electron transfer systems. Its midpoint redox potential, -446 mV, is as low as that of ferredoxin, the lowest redox potential am...

Photosensitized production of doubly reduced methylviologen followed by highly efficient methylviologen radical formation using self-assembling ruthenium(II) complexes.

Supramolecular fibers of Ru(II) complexes act as efficient photosensitizers, photochemically generating methylviologen radical (MV.+) and then converting it quantitatively to doubly reduced methylviologen, (MV0), in the presence of triethanolamine.

Electrochemistry of porous and crystalline silicon electrodes in methylviologen solutions

From measurements using stationary and rotating disc and ring-disc electrodes, it is concluded that the reduction reactions of the divalent methylviologen cation MV 2(to MV +" and MV °) proceed via the conduction band of both porous and crystalline silicon. The product of the second reduction step (MV °) forms a blocking layer on the electrode. The oxidation reactions of MV ° and MV ÷" take pla...

Paraquat poisoning: significance of plasma-paraquat concentrations.

Plasma-paraquat concentrations were measured in 79 patients who had ingested liquid or granular weedkillers containing paraquat. At any given time after ingestion, the plasma-paraquat concentrations in the patients who died usually exceeded those in the survivors. It is suggested that measurement of plasma-paraquat concentrations is useful in assessing the severity and predicting the outcome of...

Micellar effects on the reductive electrochemistry of methylviologen