title: Metal complexes with the quinolone antibacterial agent N-propyl-norfloxacin: synthesis, structure and bioactivity.
abstract: Nine new metal complexes of the quinolone antibacterial agent N-propyl-norfloxacin, pr-norfloxacin, with VO(2+), Mn(2+), Fe(3+), Co(2+), Ni(2+), Zn(2+), MoO(2)(2+), Cd(2+) and UO(2)(2+) have been prepared and characterized with physicochemical and spectroscopic techniques while molecular mechanics calculations for Fe(3+), VO(2+) and MoO(2)(2+) complexes have been performed. In all complexes, pr-norfloxacin acts as a bidentate deprotonated ligand bound to the metal through the pyridone and one carboxylate oxygen atoms. All complexes are six-coordinate with slightly distorted octahedral geometry. For the complex VO(N-propyl-norfloxacinato)(2)(H(2)O) the axial position, trans to the vanadyl oxygen, is occupied by one pyridone oxygen atom. The investigation of the interaction of the complexes with calf-thymus DNA has been performed with diverse spectroscopic techniques and has shown that the complexes can be bound to calf-thymus DNA resulting to a B-->A DNA transition. The antimicrobial activity of the complexes has been tested on three different microorganisms. The complexes show equal or decreased biological activity in comparison to the free pr-norfloxacin except UO(2)(pr-norf)(2) which shows better inhibition against S. aureus.
authors.affiliation: Institute of Physical Chemistry, NCSR "Demokritos", GR-15310 Aghia Paraskevi Attikis, Greece.
authors.forename: Eleni K
authors.initials: EK
authors.lastname: Efthimiadou
authors.forename: George
authors.initials: G
authors.lastname: Psomas
authors.forename: Yiannis
authors.initials: Y
authors.lastname: Sanakis
authors.forename: Nikos
authors.initials: N
authors.lastname: Katsaros
authors.forename: Alexandra
authors.initials: A
authors.lastname: Karaliota
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000737:chemistry* / Q000494:pharmacology; D002415:Cats; D002942:Circular Dichroism; D004578:Electron Spin Resonance Spectroscopy; D004926:Escherichia coli / Q000187:drug effects; D009682:Magnetic Resonance Spectroscopy; D019216:Metals, Heavy / Q000737:chemistry* / Q000494:pharmacology; D008826:Microbial Sensitivity Tests; D008958:Models, Molecular; D015394:Molecular Structure; D009643:Norfloxacin / Q000737:chemistry / Q000494:pharmacology; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry* / Q000494:pharmacology; D011550:Pseudomonas aeruginosa / Q000187:drug effects; D011804:Quinolines / Q000737:chemistry / Q000494:pharmacology; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013211:Staphylococcus aureus / Q000187:drug effects
chemical_list: D000900:Anti-Bacterial Agents; D019216:Metals, Heavy; D009942:Organometallic Compounds; D011804:Quinolines; C037219:quinoline; D009643:Norfloxacin