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Synthesis and characterization of Ni(II) complexes of some Schiff
bases and investigation of metal to ligand mol ratios and the
stability constants with the continuous variation method
1M.
Sadıkoğlu*, 2S.
Serin
1University
of Kahramanmaraş Sütçü İmam, Faculty of Science and Arts, Department
of Chemistry,
Kahramanmaraş,
Turkey. E-mail address:
muratsadik69@yahoo.com
2University
of Çukurova, Faculty of Science and Arts, Department of Chemistry,
Adana, Turkey.
Abstract
In this work, three Schiff base ligands which were
prepared from a mixture of 2-hydroxy-1-naphtaldehyde with
2-methyl-5-chloroaniline, 2,5-dichloroaniline and 3-chloroaniline,
respectively (A1, A2 and A3) and
their Ni(II) complexes have been synthesized and characterized by
elemental analysis, IR, electronic spectra and magnetic susceptibility
techniques. In addition, the stoichiometry and the stability constants
of the complexes were determined by applying the conventional
spectrophotometric of continuous variation method (Job’s method). The
stabilities of Ni(II) complexes of the naphtaldimine Schiff bases
containing the electron donor or acceptor groups on the 2- and 5-
position of phenyl ring were studied as connected with the role of the
molecular structure. It was observed that the Ni(II) complex of A1
Schiff base containing an electron donor -CH3 group
on the 2- position of phenyl ring was more stable than the
other complexes.
Key Words: Schiff base, Nickel(II) complexes,
Continuous variation method, Stability constant
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