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Some new symmetrical diimino tetradentate Schiff base ligands were synthesized by the reaction of 3,4-diaminobenzophenone with salicylaldehyde derivatives, such as (3,4-bis(((2-hydroxy-4-methoxyphenyl)methylene)amino)- phenyl)phenylmethanone (L 1 ), (3,4-bis(((2-hydroxy-5-methoxyphenyl)methyl- ene)amino)phenyl)phenylmethanone (L 2 ), (3,4-bis(((5-bromo-2-hydroxyphe- nyl)methylene)amino)phenyl)phenylmethanone (L 3 ) and (3,4-bis(((2-hydroxy- -5-nitrophenyl)methylene)amino)phenyl)phenylmethanone (L 4 ). Additionally, a tetradentate Schiff base ligand (3,4-bis(((2-hydroxy-3-methoxyphenyl)methyl- ene)amino)phenyl)phenylmethanone (L 5 ) was synthesized. All the Schiff bases and their Ni(II), Cu(II) and Zn(II) complexes were characterized using elemen- tal analysis and infrared, electronic, mass and 1 H-NMR spectroscopy. The for- mation constants of the complexes were measured using UV-Vis spectroscopic titration at constant ionic strength 0.10 M (NaClO4), at 25 °C in dimethylform- amide (DMF) as solvent.

journal of the serbian chemical society

Tetradentate schiff base ligands of 3,4- diaminobenzophenone: Synthesis, characterization and thermodynamics of complex formation with Ni(II), Cu(II) and Zn(II) metal ions