Evaluation of Mononuclear Ni(II) Complex of a Tetra-cryptanded Vic-dioxime and its Model Compound 14-Membered N2O2S2-Macrobicyclic Ligand as Pb2+, Cd2+, and Hg2+ Extractants

Authors: Ocak, Ummuhan¹; Gok, Yasar²; Senturk, Hasan Basri¹

Source: Separation Science and Technology, Volume 44, Number 5, January 2009 , pp. 1240-1249(10)

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Abstract:

A macrobicyclic ligand and its mononuclear Ni(II) complex were studied as extractants for Pb2+, Cd2+, and Hg2+. The metal picrates were used for extraction experiments. The solutions of the ligands in chloroform and dichloromethane were used as organic phases. The most effective transport was observed for Cd2+ picrate among the tested metal picrates with dichloromethane. The effect of pH on the extraction efficiency was evaluated for both organic solvents. The cations were stripped from the organic phase with 0.75 M nitric acid and the ligands were determined spectrophotometrically in the proper wavelength. The recovery% values of the ligands were calculated at pH 3.5.

Keywords: Macrobicyclic ligand; metal complexes; solvent extraction; toxic metal cation

Document Type: Research article

DOI: http://dx.doi.org/10.1080/01496390902729098

Affiliations: 1: Department of Chemistry, Faculty of Arts and Sciences, KTU, Trabzon, Turkey 2: Department of Chemistry, Faculty of Arts and Sciences, Pamukkale University, Denizli, Turkey

Publication date: 2009-01-01