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Ligand Exchange Reaction Between Cyanide Ion and Sulphanilamide in DMF Solvent Catalyzed by Mercury (II) : A Spectrophotometric Study

T. Ramachar, M. Umamahesh, B. Vijayabhaskara Reddy and Nuzhath Fathima

The reaction mixture containing potassium ferrocyanide in 40% dimethyl formamide (DMF), sulphanilamide at pH 4 in the presence of mercury (II) developed a reddish brown colored species. Appreciable color development occurs at 10 minutes. The color formation is monitored spectrophotometrically under the optimum conditions of 40% DMF, pH 4, wave length 510 nm, 2 fold excess hexacynoferrate (II) to sulphanilamide and mercury (II) at 1 x 10-5 M. The color reaction is successfully investigated for the spectrophotometric determination of sulphanilamide in the range 0.086 mg/mL - 0.043 mg/mL, when mercury concentration is kept fixed. In the same way, when the concentration of SN is fixed the method is successfully explored for the spectrophotometric determination of Hg (II) in the range 0.2 µg/mL to 1.2 µg/mL. The proposed method can be suitably applied for the spectrophotometric estimation of the drug sulphanilamide and also Hg (II)