title: Transition-metal complexes of isatin-beta-thiosemicarbazone. X-ray crystal structure of two nickel complexes.
abstract: Manganese, iron, cobalt, nickel, copper and zinc complexes of isatin-beta-thiosemicarbazone (H2L) have been synthesized and spectroscopically characterized The X-ray crystal structures of two nickel complexes, namely [Ni(HL)2]. EtOH (1) and [Ni(HL)2]. 2DMF (2), reveal a distorted octahedral coordination with the monodeprotonated ligand that behaves as an O,N,S terdentate. Different packing interactions are determined by the presence of different crystallization solvents, i.e., ethanol in 1 and dimethylformamide (DMF) in 2. 1H and 13C NMR studies of the ligand and zinc complexes in solution were carried out and a complete assignment for the ligand was made by homodecoupling, gradient assisted 2D 1H-13C HMQC and HMBC NMR spectroscopy. Biological studies, carried out in vitro on human leukaemic cell lines U937, have shown that the free ligand and the copper (II) complex are more active in the inhibition of cell proliferation than the nickel complexes. No compound was able to induce apoptosis.
authors.affiliation: Departamento de Química Inorgánica, Universidade de Vigo, Spain.
authors.forename: M C
authors.initials: MC
authors.lastname: Rodríguez-Argüelles
authors.forename: A
authors.initials: A
authors.lastname: Sánchez
authors.forename: M
authors.initials: M
authors.lastname: Belicchi Ferrari
authors.forename: G
authors.initials: G
authors.lastname: Gasparri Fava
authors.forename: C
authors.initials: C
authors.lastname: Pelizzi
authors.forename: G
authors.initials: G
authors.lastname: Pelosi
authors.forename: R
authors.initials: R
authors.lastname: Albertini
authors.forename: P
authors.initials: P
authors.lastname: Lunghi
authors.forename: S
authors.initials: S
authors.lastname: Pinelli
mesh_terms: D017209:Apoptosis / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D018360:Crystallography, X-Ray; D006801:Humans; D006860:Hydrogen Bonding; D007510:Isatin / Q000031:analogs & derivatives* / Q000737:chemistry / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D008670:Metals / Q000737:chemistry*; D015394:Molecular Structure; D009532:Nickel / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D020298:U937 Cells
chemical_list: D008670:Metals; C013578:isatin beta-thiosemicarbazone; D009532:Nickel; D007510:Isatin