title: Synthesis, characterization and biological activities of Cu(II), Co(II), Mn(II), Fe(II), and UO2(VI) complexes with a new Schiff Base hydrazone: O-hydroxyacetophenone-7-chloro-4-quinoline hydrazone.
abstract: The Schiff base hydrazone ligand HL was prepared by the condensation reaction of 7-chloro-4-quinoline with o-hydroxyacetophenone. The ligand behaves either as monobasic bidentate or dibasic tridentate and contain ONN coordination sites. This was accounted for be the presence in the ligand of a phenolic azomethine and imine groups. It reacts with Cu(II), Ni(II), Co(II), Mn(II), UO(2) (VI) and Fe(II) to form either mono- or binuclear complexes. The ligand and its metal complexes were characterized by elemental analyses, IR, NMR, Mass, and UV-Visible spectra. The magnetic moments and electrical conductance of the complexes were also determined. The Co(II), Ni(II) and UO(2) (VI) complexes are mononuclear and coordinated to NO sites of two ligand molecules. The Cu(II) complex has a square-planar geometry distorted towards tetrahedral, the Ni(II) complex is octahedral while the UO(2) (VI) complex has its favoured heptacoordination. The Co(II), Mn(II) complexes and also other Ni(II) and Fe(III) complexes, which were obtained in the presence of Li(OH) as deprotonating agent, are binuclear and coordinated via the NNNO sites of two ligand molecules. All the binuclear complexes have octahedral geometries and their magnetic moments are quite low compared to the calculated value for two metal ions complexes and thus antiferromagnetic interactions between the two adjacent metal ions. The ligand HL and metal complexes were tested against a strain of Gram +ve bacteria (Staphylococcus aureus), Gram -ve bacteria (Escherichia coli), and fungi (Candida albicans). The tested compounds exhibited high antibacterial activities.
authors: Chemistry Department, College of Science, Princess Nora Bint Abdul Rahman University, 11322 Riyadh, P.O. 240549, Saudi Arabia. nora_shaalan@yahoo.com
authors: Nora H
authors: NH
authors: Al-Shaalan
mesh_terms: D000098:Acetophenones / Q000737:chemistry; D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D002176:Candida albicans / Q000187:drug effects; D003035:Cobalt / Q000737:chemistry; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D003300:Copper / Q000737:chemistry; D004926:Escherichia coli / Q000187:drug effects; D006835:Hydrazones / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D007501:Iron / Q000737:chemistry; D008024:Ligands; D008345:Manganese / Q000737:chemistry; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D011804:Quinolines / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D012545:Schiff Bases / Q000737:chemistry* / Q000494:pharmacology*; D013211:Staphylococcus aureus / Q000187:drug effects; D017974:Uranium Compounds / Q000737:chemistry
chemical_list: D000098:Acetophenones; D000900:Anti-Bacterial Agents; D056831:Coordination Complexes; D006835:Hydrazones; D008024:Ligands; C570678:O-hydroxyacetophenone-7-chloro-4-quinoline hydrazone; D011804:Quinolines; D012545:Schiff Bases; D017974:Uranium Compounds; C087908:2'-hydroxyacetophenone; D003035:Cobalt; D008345:Manganese; D003300:Copper; D007501:Iron; C012597:uranium dioxide