{1-[1-(2-Hydroxyphenyl)ethylidene]-2-(pyridin-2-yl-?N’)hydrazine-?2N,O}{1-[1-(2-oxidophenyl)ethylidene]-2-(pyridin-2-yl-?N)hydrazine-?2N’,O}nickelate(II) nitrate hemihydrate
The 2-hydrazinopyridine precursor has been widely used to prepare ligands of
various kinds by condensation with carbonyl compounds. These types of ligands
are suitable for synthesizing novel transition metal (II) complexes with
interesting magnetic properties. In this context we have synthesized the ligand
1-(2-hydroxyphenyl-2-ethylidene)-2-(pyridin-2-yl)hydrazine (HL) which was
used in the preparation of the mononuclear title complex, [Ni(C13H12N3O)-
(C13H13N3O)]NO30.5H2O. As a result of the presence of HL and L in the
[{Ni(HL)(L)}]+ unit, the complex appears to be a supramolecular dimer
composed of the () and () optical isomers, which are linked by strong
hydrogen-bonds. As well as the dimer generated by two mononuclear
[{Ni(HL)(L)}]+ cations, the asymmetric unit also contains two nitrate anions
and one water molecule. Each Ni atom is coordinated to two ligand molecules by
a nitrogen atom of the pyridine ring, an imine nitrogen atom and a phenolic
oxygen atom of one of the ligand molecules and a phenolate oxygen atom of the
other organic molecules. The environment around the cation is a distorted
octahedron. The basal planes are defined by the two nitrogen atoms of the
pyridine rings and the two phenolic oxygen atoms of the ligand, the apical
positions being occupied by the azomethine atoms. The O atoms of one of the
nitrate ions are disordered over two sets of sites in a 0.745 (9):0.255 (9) ratio. In
the crystal, the dimers are linked by numerous hydrogen bonds, forming a threedimensional framework.
Auteur(s) : Sarr M., Diop M., Thiam E. I., Gaye M., Barry A. H. and J. Ellena
Pages : 642–645
Année de publication : 2018
Revue : Acta Cryst
N° de volume : E74,
Type : Article
Mise en ligne par : THIAM Ibrahima El Hadji