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Three new complexes of 1,10‐Phenanthroline (phen), [Ca(phen)2(H2O)2(NO3)](NO3) (1), [Sr(phen)2(H2O)2(NO3)](NO3) (2) and [Ca(phen)2(H2O)2(NO3)][BF4] (3) were synthesized and characterized by UV, FT IR, Raman, and MS spectra. Their crystal structures were also determined. In 1 and 2 only one of the (NO3)− is coordinated to the central atom. The other (NO3)− is away from the metal ion and was replaced by [BF4]− under the conditions of a competitive reaction. The two phenanthroline molecules also occupy nonequivalent positions showing typical π – π interactions in their crystal packing.

Novel heavy metal complexes: Sr(5-NH2-phen)4(NO3)(OH)(H2O)2 (1) (synthesized via a static self-assembly process) and Sn(phen)(NO3)(OH)(H2O) (2), Sn(5-NH2-phen)(OH)(Cl)(H2O) (3), Pb(5-NH2-phen)(NO3)2(H2O) (4) (obtained via metal competitive reactions under mild conditions) were reported. The coordination compounds were characterized by elemental analysis, FTIR-spectroscopy and FAB-mass spectrometry. Their cytotoxicity was measured by MTS-test towards human tumour (MDA-MB-231, HT-29, HeLa, HepG2) and non-tumour diploid (Lep-3) cell lines. The most pronounced cytotoxic effect on all cancer lines showed 1 and 4 at their high concentrations as well as 1 at its lower ones (≤ 4×10−2 mg). Therefore, strontium complex of 5-amino-o-phenanthroline (1) exhibited the widest antitumour spectrum activity, having no toxicity to non-tumour cells at quantities ≤ 4×10−2 mg. The computed EC50 values of 1–4 against MDA-MB-231, HT-29, HeLa, HepG2 varied from 1.40×10−3 to 6.31×10−6 M. Towards Lep-3 substances 2–4 showed IC50 7.52×10−4 − 0.44 M. Substance 1 possess EC50=1.26×10−7 M to the non-tumour cells.

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