Structure and biological activities of metal complexes of flumequine

The reaction of CoCl2·6H2O with the quinolone antimicrobial agent flumequine (Hflmq) in the absence or presence of the α-diimines 2,2′-bipyridine (bipy), 1,10-phenanthroline (phen) or 2,2′-bipyridylamine (bipyam) resulted in the formation of four mononuclear complexes which were characterized with physicochemical and spectroscopic techniques. The crystal structures of [Co(flmq)2(bipy)]·2H2O, [Co(flmq)2(phen)]·1.6MeOH·0.4H2O and [Co(flmq)2(bipyam)]·H2O were determined by X-ray crystallography. The interaction of the complexes with calf-thymus DNA (CT DNA) was investigated by UV spectroscopy, viscosity measurements, cyclic voltammetry and competitive studies with ethidium bromide in order to evaluate the possible DNA-binding mode and to calculate the corresponding DNA-binding constants. The binding of the complexes to human or bovine serum albumin was studied by fluorescence emission spectroscopy and the corresponding binding constants were determined. The antimicrobial activity of the Co(II)–flumequine and the recently reported Cu(II)–flumequine complexes was tested against four different microorganisms (Escherichia coli, Xanthomonas campestris, Staphylococcus aureus and Bacillus subtilis) and was found to be similar to that of free Hflmq. The antiproliferative activity of previously reported complexes [Cu(flmq)(phen)Cl], [Zn(flmq)(phen)Cl] and [Ni(flmq)2(phen)] against human ovarian (A2780) and lung (A549) cancer cell lines is also reported in comparison to the cobalt analogue, [Co(flmq)(phen)Cl], 3, highlighting important differences among the various complexes which may be due to different uptake and modes of action

CCDC 1430331: Experimental Crystal Structure Determination

Related Article: Ifigenia Tsitsa, Alketa Tarushi, Panagiota Doukoume, Franc Perdih, Andreia de Almeida, Athanasios Papadopoulos, Stavros Kalogiannis, Angela Casini, Iztok Turel, George Psomas|2016|RSC Advances|6|19555|doi:10.1039/C5RA25776J,An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

CCDC 1430330: Experimental Crystal Structure Determination

Related Article: Ifigenia Tsitsa, Alketa Tarushi, Panagiota Doukoume, Franc Perdih, Andreia de Almeida, Athanasios Papadopoulos, Stavros Kalogiannis, Angela Casini, Iztok Turel, George Psomas|2016|RSC Advances|6|19555|doi:10.1039/C5RA25776J,An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

CCDC 1430329: Experimental Crystal Structure Determination

Related Article: Ifigenia Tsitsa, Alketa Tarushi, Panagiota Doukoume, Franc Perdih, Andreia de Almeida, Athanasios Papadopoulos, Stavros Kalogiannis, Angela Casini, Iztok Turel, George Psomas|2016|RSC Advances|6|19555|doi:10.1039/C5RA25776J,An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.