Lanthanide(III) complexes with tridentate Schiff base ligand, antioxidant activity and X-ray crystal structures of the Nd(III) and Sm(III) complexes
| Autor: | Mbossé Ndiaye Gueye, Aliou Hamady Barry, Djiby Lo, Mohamed Gaye, Pascal Retailleau, Moussa Dieng, Ibrahima Elhadji Thiam |
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| Rok vydání: | 2017 |
| Předmět: |
Lanthanide
Schiff base 010405 organic chemistry Stereochemistry Ligand antioxidant activity chemistry.chemical_element General Chemistry Crystal structure Lanthanide complexes 010402 general chemistry Condensation reaction 01 natural sciences 0104 chemical sciences Metal Samarium Crystallography chemistry.chemical_compound chemistry visual_art visual_art.visual_art_medium Lanthanide complexes hydrazino antioxidant activity X-ray structure X-ray structure hydrazino Monoclinic crystal system |
| Zdroj: | South African Journal of Chemistry, Volume: 70, Pages: 08-15, Published: 2017 South African Journal of Chemistry; Vol 70 (2017); 8-15 |
| ISSN: | 0379-4350 |
| Popis: | The tridentate N4-type Schiff base was synthesized from the condensation reaction of 2-hydrazinopyridine and pyridine-2-carbaldehyde. Neodymium and Samarium complexes were isolated when the corresponding nitrate salt was added to the solution of the ligand. The isolated compounds were characterized by elemental analyses, IR study, room temperature magnetic measurements and single X-ray crystal diffraction of the two crystals. Both complexes crystallize in the monoclinic system with space group P21/c. The cell parameters of the Nd complex are a=11.0927(8) Å, b=17.9926 (13) Å, c=11.9395(9)Å and β = 115.274(5) ° while the Sm complex shows parameters cell of a = 11.0477(8) Å, b = 17.9254(13) Å, c = 11.9149(8) Å and β =115.489(5) °. The X-ray study reveals isotopic Nd/Sm binuclear structures were each metal ion is nine-coordinated in the same fashion. Both metal centers have distorted tricapped trigonal prism geometry, with the Schiff base acting as tridentate ligand. The DPPH· radical scavenging effects of the Schiff base ligand and its Ln(III) complexes were screened. The Ln(III) complexes were significantly more efficient in quenching DPPH· than the free Schiff base ligand.Keywords: Lanthanide complexes, hydrazino, antioxidant activity, X-ray structure |
| Databáze: | OpenAIRE |
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