Acta Crystallographica Section C
Crystal Structure Communications
Volume 64, Part 5 (May 2008)
Bis[2-hydroxy-N'-(3-phenylprop-2-enylidene)benzohydrazidato-2N',O]bis(methanol-O)nickel(II) and bis[2-hydroxy-N'-(3-phenylprop-2-enylidene)benzohydrazidato-2N',O]bis(pyridine-N)nickel(II)
Abstract: In the two title complexes of cinnamaldehyde salicyloylhydrazone [or 2-hydroxy-N'-(3-phenylprop-2-enylidene)benzohydrazide], [Ni(C16H13N2O2)2(CH4O)2], (I), and [Ni(C16H13N2O2)2(C5H5N)2], (II), the NiII atoms lie on crystallographic inversion centres and have distorted octahedral geometries. The equatorial plane is defined by two carbonyl O atoms and two hydrazine N atoms of two bidentate trans-oriented salicyloylhydrazone ligands. The axial positions are occupied by two O atoms from two coordinated methanol molecules in (I) and by two N atoms from two coordinated pyridine molecules in (II). There is an extended chain structure in (I) resulting from intermolecular O-HO hydrogen bonds between coordinated methanol molecules and phenol O atoms, while (II) comprises discrete molecules. Complex (I) also exhibits weak - stacking interactions, and intramolecular O-HN hydrogen bonds are present in both (I) and (II). The salicyloylhydrazone ligands in (I) and (II) are coordinated to the metal atom through the carbohydrazide O and N2 atoms, not via the phenol O atom. We have established a link between the reagents used and the nuclearity of the complex formed: the ligand produced by condensation between salicylhydrazide and an aldehyde leads to mononuclear complexes, while replacing the aldehyde in the reaction by a ketone leads to multinuclear complexes.
Formula: [Ni(C16H13N2O2)2(CH4O)2] and [Ni(C16H13N2O2)2(C5H5N)2]Notes:
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