Mononuclear copper(II) nitrato complexes with methyl-substituted 4-nitropyridine N-oxide. Physicochemical and cytotoxic characteristics.

Aniela Puszko, Anna Krojcer, Marzena Pełczynska, Joanna Wietrzyk, Maria Cieślak-Golonka, Julia Jezierska, Anna Adach, Maria Kubiak

Index: J. Inorg. Biochem. 104(2) , 153-60, (2010)

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Abstract

Three new complexes, products of the interaction of Cu(NO(3))(2) and methyl-substituted 4-nitropyridine N-oxides were synthesized and characterized by elemental analysis, magnetic, spectroscopic (IR, FIR and EPR), thermal and X-ray methods. The complexes (magnetic moments 1.70-1.81 BM at 300K) of general formula [Cu(H(2)O)(NO(3))(2)L(2)], L=2-methyl-4-nitropyridine N-oxide and [Cu(NO(3))(2) L'(2)], where L'=2,6-dimethyl- and 2,3,6-trimethyl-4-nitropyridine N-oxide were obtained. The compounds were unstable upon dissolution. The X-ray single crystal structure of Cu(II) complex with 2,6-dimethyl-4-nitropyridine N-oxide was determined and analysed. The compounds and free ligands were tested in vitro on the cytotoxic activity against MCF-7 and SW-707 human cancer cell lines. The complexes with 4-nitropyridine N-oxide (a reference) and 2-methyl-4-nitropyridine N-oxide show a significant anti-proliferative activity against studied cell lines. A reciprocal relationship between the activity and the number of methyl groups was observed. Both ligands and complexes are cytotoxic active but to the different cell lines.