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  • Chem Sci Trans., 2013, 2(4),  pp 1118-1125  

    DOI:10.7598/cst2013.465

    Research Article

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

  • CHIZOBA I. EZUGWU, OGUEJIOFO T. UJAM, PIUS O. UKOHA and NKECHI N. UKWUEZE
  • Department of Pure and Industrial Chemistry, University of Nigeria, Nsukka, Enugu State, Nigeria
  • Abstract

    A novel Schiff base ligand N, N-bis(salicylidene)-3,5-diaminobenzoic acid (H2B) has been synthesised and characterised by UV, IR, 1H and 13C NMR spectroscopy. The Hg(II) and Ag(I) complexes of H2B 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 H2B 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 H2B using CHCl3 and CCl4 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 H2B was observed at pH 8 and pH 8 respectively. At 2.0 M HNO3 and 1.0 M KNO3 up to 99.01% of Hg(II) was extracted. At 0.01 M HNO3 and 1.0 M EDTA, Ag(I) was successfully separated from an aqueous mixture of Hg(II) and Ag(I) using 1% H2B/CCl4.

    Keywords

    N, N'-bis(salicylidene)-3,5-diaminobenzoic acid, Complex formation, Extraction, Hg(II) and Ag(I) complexes

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