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A Two new azomethine compounds, L1 and
L2, were prepared by the condensation of
5-fluoro-2-hydroxyacetophenone with furan-2-carbohydrazide and
thiophene-2-carbohydrazide, respectively. The structure of the
synthesized compounds (ligands) was characterized by different
techniques such as CHN(S) analysis, UV-Vis. spectrophotometry, FT-IR
spectroscopy, 1H-NMR spectroscopy, and mass spectrometry. Formation
of binary complexes of the divalent transition metal ions Co (II),
Ni (II) and Cu (II) with Schiff bases was investigated by the
conventional potentiometric technique. The proton-ligand stability
constant (pK1 H) of the Schiff bases and the metal-ligand stability
constant (log K1) of their complexes with Co (II), Ni (II), and Cu
(II) have been extensively determined through Calvin-Bjerrum
pH-metric titration technique.
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