Synthesis, Characterization and Solvent Extraction Studies of 3,5-bis[(2-hydroxy-benzylidene)-amino]-benzoic Acid and its Co(ii) and Ni(ii) Complexes

Description

– Synthesis, Characterization and Solvent Extraction Studies of 3,5-bis[(2-hydroxy-benzylidene)-amino]-benzoic Acid and its Co(ii) and Ni(ii) Complexes –

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Abstract

3,5-Bis[(2-hydroxy-benzylidene)-amino]-benzoic acid (H2B) and its cobalt (II) and nickel (II) complexes were synthesized and characterized via electronic, IR, 1 H NMR, and 13C NMR. Job’s continuous variation method was used to determine the mole ratio for both metal complexes.

Solvent extraction studies were carried out on H2B in 5% DMF with its cobalt (II) and nickel (II) complexes using CHCl3 as an organic solvent; with variable condition effects of equilibrium time, buffer pH, mineral acids, salting-out agents, and complexing agents.

IR spectral study indicates coordination through (N2O2) azomethine and protonated hydroxyl groups. Job’s continuous variation method showed a metal to ligand ratio, 1:1, for both metal complexes of H2B. Cobalt (II) complex of H2B showed quantitative extraction in pH range 5 – 7,

Introduction

Extraction is the transfer of a solute from one phase to another. Common reasons to carry out an extraction in chemistry are to isolate or concentrate the desired analyte or to separate it from species that would interfere in the analysis.

The most common cause is the extraction of an aqueous solution with an organic solvent that is immiscible and less dense than water; they form a separate phase that floats on top of the aqueous phase.

Solvent or liquid-liquid extraction is based on the principle that a solute can distribute itself in a certain ratio between two immiscible solvents, one of which is usually water and the other an organic solvent such as benzene, carbon tetrachloride, or chloroform. In certain cases, the solute can be more or less completely transferred into the organic phase.

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