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
| Autor: | Rosa Pedrido, M. Isabel Fernández, Marcelino Maneiro, Miguel Vázquez, Ana M. González-Noya, M. José Romero, M. Jesús Rodríguez, Manuel R. Bermejo |
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| Rok vydání: | 2005 |
| Předmět: |
Thiosemicarbazones
Magnetic Resonance Spectroscopy Spectrophotometry Infrared Pyridines Stereochemistry Iron chemistry.chemical_element Manganese Zinc Ligands Inorganic Chemistry X-Ray Diffraction Nickel Organometallic Compounds Coordination geometry Molecular Structure Chemistry Ligand Cobalt Non-innocent ligand Crystallography Lead Inert pair effect Copper Cadmium |
| Zdroj: | Dalton Trans.. :572-579 |
| ISSN: | 1477-9234 1477-9226 |
| DOI: | 10.1039/b416296j |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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