title: Syntheses and X-ray characterization of metal complexes with the pentadentate thiosemicarbazone ligand bis(4-N-methylthiosemicarbazone)-2,6-diacetylpyridine. The first pentacoordinate lead(II) complex with a pentagonal geometry.
abstract: In this paper we describe the electrochemical synthesis and characterization of new neutral manganese, iron, cobalt, nickel, copper, zinc, cadmium and lead complexes with the ligand bis(4-N-methylthiosemicarbazone)-2,6-diacetylpyridine, H4DAPTsz-Me. X-Ray structures of [Mn(H2DAPTsz-Me)(EtOH)2] 1, [Pb(H2DAPTsz-Me)] 3 and [Zn(H2DAPTsz-Me)]2.EtOH.2H2O 4, were also determined. In these complexes the ligand behaves as bis-deprotonated and SNNNS pentadentate. In the manganese complex the metal is heptacoordinated, in a distorted pentagonal-bipyramidal environment, with the N3S2 donor set of the ligand in the pentagonal girdle and two solvent molecules occupying the axial positions. In the lead complex 3 the metal is pentacoordinated, bound exclusively to the five donor atoms of the ligand, as a consequence of the existence of "inert pair effect". The bishelical zinc complex 4 shows each zinc atom with different coordination geometry, one octahedrally six-coordinate while the other is distorted tetrahedrally four-coordinate.
authors.affiliation: Departamento de Química Inorgánica, Facultade de Química, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain.
authors.forename: Rosa
authors.initials: R
authors.lastname: Pedrido
authors.forename: Manuel R
authors.initials: MR
authors.lastname: Bermejo
authors.forename: M José
authors.initials: MJ
authors.lastname: Romero
authors.forename: Miguel
authors.initials: M
authors.lastname: Vázquez
authors.forename: Ana M
authors.initials: AM
authors.lastname: González-Noya
authors.forename: Marcelino
authors.initials: M
authors.lastname: Maneiro
authors.forename: M Jesús
authors.initials: MJ
authors.lastname: Rodríguez
authors.forename: M Isabel
authors.initials: MI
authors.lastname: Fernández
mesh_terms: D002104:Cadmium / Q000737:chemistry; D003035:Cobalt / Q000737:chemistry; D003300:Copper / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D007854:Lead / Q000737:chemistry*; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D008345:Manganese / Q000737:chemistry; D015394:Molecular Structure; D009532:Nickel / Q000737:chemistry; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D011725:Pyridines / Q000138:chemical synthesis* / Q000737:chemistry; D013055:Spectrophotometry, Infrared; D013882:Thiosemicarbazones / Q000138:chemical synthesis* / Q000737:chemistry; D014961:X-Ray Diffraction; D015032:Zinc / Q000737:chemistry
chemical_list: D008024:Ligands; D009942:Organometallic Compounds; D011725:Pyridines; D013882:Thiosemicarbazones; D002104:Cadmium; D007854:Lead; D003035:Cobalt; D008345:Manganese; D003300:Copper; D009532:Nickel; D007501:Iron; D015032:Zinc