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. 2020 Jul 24;76(Pt 8):1349-1352.
doi: 10.1107/S2056989020009834. eCollection 2020 Aug 1.

Di-aqua-bis-{μ-1,5-bis-[(pyridin-2-yl)methyl-idene]carbonohydrazide(1-)}di-μ-chlorido-tetra-chlorido-tetra-zinc(II)

Thierno Moussa Seck  1 , Papa Aly Gaye  2 , Cheikh Ndoye  1 , Ibrahima Elhadji Thiam  1 , Ousmane Diouf  1 , Pascal Retailleau  3 , Mohamed Gaye  1
Affiliations

Di-aqua-bis-{μ-1,5-bis-[(pyridin-2-yl)methyl-idene]carbonohydrazide(1-)}di-μ-chlorido-tetra-chlorido-tetra-zinc(II)

Thierno Moussa Seck et al. Acta Crystallogr E Crystallogr Commun. .

Abstract

A tetra-nuclear ZnII complex, [Zn4(C13H11N6O)2Cl6(H2O)2] or {[Zn2(HL)(H2O)(Cl2)](μCl)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 H2 L [1,5-bis-(pyridin-2-yl-methyl-ene)carbono-hydrazide]. In the tetra-nuclear complex, each of the two ligand mol-ecules forms a dinuclear unit that is connected to another dinuclear unit by two bridging chloride anions. In each dinuclear unit, one ZnII cation is penta-coordinated in a N2OCl2 in a distorted square-pyramidal geometry, while the other ZnII cation is hexa-coordinated in a N3OCl2 environment with a distorted octa-hedral geometry. The basal plane around the penta-coordinated ZnII cation is formed by one chloride anion, one oxygen atom, one imino nitro-gen atom and one pyridine nitro-gen atom with the apical position occupied by a chloride anion. The basal plane of the hexa-coordinated ZnII cation is formed by one chloride anion, one hydrazinyl nitro-gen atom, one imino nitro-gen atom and one pyridine nitro-gen atom with the apical positions occupied by a water oxygen atom and a bridged chloro anion from another dinuclear unit, leading to a tetra-nuclear complex. A series of intra-molecular C-H⋯Cl hydrogen bonds is observed in each tetra-nuclear unit. In the crystal, the tetra-nuclear units are connected by inter-molecular C-H⋯Cl, C-H⋯O and N-H⋯O hydrogen bonds, forming a planar two-dimensional structure in the ac plane.

Keywords: complex; crystal structure; square-pyramidal coordination; tetra­nuclear; zinc.

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Figures

Figure 1
Figure 1
A view of the title compound, showing the atom-numbering scheme. Displacement ellipsoids are plotted at the 30% probability level. Unlabelled atoms are generated by the symmetry operation 1 − x, 1 − y, −z.
Figure 2
Figure 2
View of the chains formed by hydrogen bonds in the ac plane.
See this image and copyright information in PMC

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