Metal transition complexes of tridentate Schiff base ligands derived from 2?hydrazinopyridine: synthesis, spectroscopic characterization and X?ray structures
Mononuclear complexes of 1-(pyridin-2-ylmethylidene)-2-(pyridin-2-yl)hydrazine (HL1) and 1-(pyridin-2-yl)-2-(1-(pyridin-
2-yl)ethylidene)hydrazine (HL2), [Mn(HL1)(Cl2)(H2O)] (1), [Zn(HL1)(CH3COO)2]·(H2O)3 (2), [Mn(HL2)2]·(ClO4)2 (3) and
[Cu(HL2)(NO3)2(H2O)] (4) were synthesized and characterized by physicochemical and spectroscopic methods and X-ray
structure determination. The mononuclear compounds 1, 2 and 4 contain one ligand molecule per metal atom while the
manganese (II) atom in compound 3 is coordinated to two ligand molecules. Both ligands coordinated to the transition metal
center in a tridentate fashion through two Npyridyl
atoms and one Nimino atom. The chloride and acetate anions coordinate in monodentate manner, respectively, in complex 1 and in complex 2. In complex 3, the perchlorate groups remain uncoordinated. In complex 4, the nitrate anions act in unidentate fashion. The molar conductance value indicates that the complexes
obtained from HL1 are non-electrolytes while those obtained from HL2
are 2:1 electrolytes in DMF solutions. The X-ray structures reveal octahedral geometry for complexes 1, 3, 4 and trigonal bipyramidal environment for 2.
Auteur(s) : Amar Diop, Mamou Sarr, Mayoro Diop, Ibrahima Elhadj Thiam, Aliou Hamady Barry, Simon Coles, James Orton, Mohamed Gaye
Pages : 415–423
Année de publication : 2019
Revue : Transition Metal Chemistry
N° de volume : 44
Type : Article
Mise en ligne par : THIAM Ibrahima El Hadji