The polarographic behaviour of 2,4-DINITROSORESORCINOL (cas 118-02-5) in aqueous and nonaqueous methanolic media

Add time:08/30/2019    Source:sciencedirect.com

Summary2,4-DINITROSORESORCINOL (cas 118-02-5) (DNR) is polarographically reduced in aqueous buffered solutions along two equal, diffusion-controlled waves each involving the transfer of 2e−/molecule. Comparison with studied cases supports the conclusion that each of the two nitroso grous in DNR reduces independently to the hydroxylamine stage. Based on tautomeric effect, the reduction of the middle-NO group is considered to precede that of the terminal one.DNR in nonaqueous methanolic media reduces along three unequal waves. Reactions are formulated to account for the electrode processes, which presume self-protonation along the first (diffusion-controlled) wave and the involvement of solvent-protons along the second and third (partially kinetically-controlled) waves. The addition of a proton donor (benzoic acid and HCl) causes the reduction of DNR to take place along two equal waves, similar to those in aqueous media, when four or more moles acid/mole depolarizer are present in the solution. The total height of the polarogram increases in the presence of the proton donor due to the break down of dimeric associations of DNR present in pure methanol. The first two reduction waves of DNR in methanol are eliminated, and the third one retreats towards more negative potentials, when NaOH is added to the solution. Reduction of the two nitroso groups of the dianionic species takes place in one step. The limiting current decreases slightly as a result of solvation of the negatively charged dianion.

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