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Di­aqua­bis­{?-1,5-bis­[(pyridin-2-yl)methyl­idene]carbonohydrazide(1–)}di-?-chlorido-tetra­chlorido­tetra­zinc(II)

A tetra­nuclear ZnII complex, [Zn4(C13H11N6O)2Cl6(H2O)2] or {[Zn2(HL)(H2O)(Cl2)](?Cl)2[Zn2(HL)(H2O)(Cl)]}2, was synthesized by mixing an equimolar amount of a methanol solution containing ZnCl2 and a methanol solution containing the ligand H2L [1,5-bis­(pyridin-2-yl­methyl­ene)carbono­hydrazide]. In the tetra­nuclear complex, each of the two ligand mol­ecules forms a dinuclear unit that is connected to another dinuclear unit by two bridging chloride anions. In each dinuclear unit, one ZnII cation is penta­coordinated in a N2OCl2 in a distorted square-pyramidal geometry, while the other ZnII cation is hexa­coordinated in a N3OCl2 environment with a distorted octa­hedral geometry. The basal plane around the penta­coordinated ZnII cation is formed by one chloride anion, one oxygen atom, one imino nitro­gen atom and one pyridine nitro­gen atom with the apical position occupied by a chloride anion. The basal plane of the hexa­coordinated ZnII cation is formed by one chloride anion, one hydrazinyl nitro­gen atom, one imino nitro­gen atom and one pyridine nitro­gen atom with the apical positions occupied by a water oxygen atom and a bridged chloro anion from another dinuclear unit, leading to a tetra­nuclear complex. A series of intra­molecular C—H...Cl hydrogen bonds is observed in each tetra­nuclear unit. In the crystal, the tetra­nuclear units are connected by inter­molecular C—H...Cl, C—H...O and N—H...O hydrogen bonds, forming a planar two-dimensional structure in the ac plane.


Auteur(s) : T. M. Seck, P. A. Gaye, C. Ndoye, I. E. Thiam, O. Diouf, P. Retailleau and M. Gaye
Pages : 1349-1352
Année de publication : 2020
Revue : Acta Cryst.
N° de volume : E76
Type : Article
Mise en ligne par : GAYE Mohamed Lamine