Reduction in DMF Solution

When a solution of the complex in DMF is mixed with a solution of ascorbic acid in DMF and the mixture warmed, the colour of the mixture does not change to grey and then pink as in aqueous solution but the colour darkens and becomes purple/green, indicative of formation of a more strongly absorbing reduction product. Hence the study of this reaction in this solvent is of particular interest. 

Mix equal volumes of 0.001 M in the complex in DMF and 0.002 M in ascorbic acid in a flask provided with an upright condenser with running water through it. Warm in a water bath at 40°C for 1-2 hours. Run the spectra of the initial reaction mixture and the solution after warming. Locate the suitable wavelengths to follow the reaction spectrophotometrically. Run the spectra over the range 450-750 nm and in the range 250-450 after dilution with an equal volume of DMF. 

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Investigations of PAN reduction in DMF solution in the presence of Raney nickel, sodium hyposulfite, acetic acid, pyridine, and water at 40-100 °C have shown52 ... 

This preparation has been modified by electronic reduction in DMF solution containing 0.3 M Bu4N BF4 as electrolyte in an undivided cell with a platinum cathode and the anode prepared from the expected metal as cation source. 

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