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Abstract Several new Cu(II) complexes of Schiff bases
obtained by condensation of 2-[N-(a-picolyl)-amino]-benzophenone with different chiral amino acids were synthesized
and characterized by physico-chemical and spectroscopic
methods. The crystal structure of one of the complexes was
determined using single crystal X-ray diffraction. The
ligands were coordinated to the metal atom in a tetradentate manner with ONNN donor sets using the carboxyl
oxygen, azomethine nitrogen, CON
-, and pyridine nitrogen. The cytotoxicities of the complexes were evaluated
against human cancer cells. The substituents on the aromatic rings strongly influenced the cytotoxicities of the
complexes. The complex with bromine substituents on the
pyridine rings showed the highest cytotoxicity. The antitumor activities against tumor cell lines were assayed in
vitro, and the complexes were found to be highly effective,
with six of the nine complexes having inhibition ratios
better than that of 5-Fluorouracil. This behavior is indicative of a high ability to circumvent the cellular drug
resistance mechanisms

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