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A novel Schiff base ligand N, N ' -bis(salicylidene)-3,5-diaminobenzoic acid (H 2B) has been synthesised and characterised by UV, IR, 1 H and 13 C NMR spectroscopy. The Hg(II) and Ag(I) complexes of H 2B were synthesised and characterised by UV and IR spectroscopy together with ligand to metal mole ratio by Jobs variation method. The IR spectral study of H 2B and its Hg(II) and Ag(I) complexes showed that both metal ions coordinate through the two nitrogen atoms of the azomethine group and the two oxygen atoms of the deprotonated hydroxyl group of the salicyaldehyde moiety. Solvent extraction studies were carried out on Hg(II) and Ag(I) complexes of H 2B using CHCl 3 and CCl 4 as organic solvents respectively. Studies were conducted on the effect of time, buffer pH, mineral acids, salting-out agents and complexing agents on the extraction of Hg(II) and Ag(I). Maximum extraction of Hg(II) and Ag(I) using H 2B was observed at pH 8 and pH 8 respectively. At 2.0 M HNO 3 and 1.0 M KNO 3 up to 99.01% of Hg(II) was extracted. At 0.01 M HNO 3 and 1.0 M EDTA, Ag(I) was successfully separated from an aqueous mixture of Hg(II) and Ag(I) using 1% H 2B/CCl 4.

Complex Formation and Extraction Studies of N, N -Bis (salicylidene)-3,5-diaminobenzoic Acid on Hg(II) and Ag(I)