Abstract
In the title complex mol-ecule, [Cd(C13H11N4O2)2], the Cd atom is coordinated in a distorted octa-hedral geometry by two tridentate ligands synthesized from 2-hy-droxy-benzohydrazide and 1-(pyrazin-2-yl)ethan-1-one. The mol-ecule has twofold crystallographic symmetry and is isomorphous to its Mn, Co, Ni, Cu and Zn counterparts.
Highlights
The O2—C7 and C7—N1 bond lengths in the title compound are 1.255 (5) Aand 1.355 (5) A, respectively, indicating that the coordinated ligands are closer to the keto than the enol form, but are slightly more delocalized than in the purely keto tautomeric form as found in the free ligand form of similar aroylhydrazones
We found that when the hydroxyl group is in the meta or para position {3-hydroxyN0-[1-(pyrazin-2-yl)ethylidene]benzohydrazide (L2) or 4-hydroxy-N0-[1-(pyrazin-2-yl)ethylidene]benzohydrazide (L3)}, where no intramolecular hydrogen bond can be formed, crystallization is substantially delayed and a much longer time is required for the complexes to crystallize
Intermolecular – stacking is observed between the pyrazine rings and benzene rings of ligands in neighbouring complexes [the centroid–centroid distance between N3–N4/ C9–C12 and C1–C6vi [symmetry code: (vi) x, y À 12, z À 12] is 3.641 (2) A, with a slippage of 1.252 A, Fig. 3
Summary
Two types of weak intermolecular interactions, C—HÁ Á ÁN and C—HÁ Á ÁO hydrogen bonds and – stacking and C—HÁ Á Á interactions, have a significant impact on the packing of the complexes in the solid state. Intermolecular – stacking is observed between the pyrazine rings and benzene rings of ligands in neighbouring complexes [the centroid–centroid distance between N3–N4/ C9–C12 and C1–C6vi [symmetry code: (vi) x, y À 12, z À 12] is 3.641 (2) A , with a slippage of 1.252 A , Fig. 3. Intermolecular interactions between carbon atoms C13 and the ring of lateral benzene rings and pyrazine rings in neighbouring molecules are found, namely C13—H13BÁ Á ÁCg1v [2.71 A , Cg1 is the centroid of the C1–C6 ring; symmetry code: (v) Àx + 32, y, z À 12] and C13–H13AÁ Á ÁCg2iv [2.86 A , Cg2 is the centroid of the N3–N4/C9–C12; symmetry code: (iv) Àx + 32, y, z + 12] (Fig. 3)
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