Acta Crystallographica Section C

Crystal Structure Communications

Volume 64, Part 5 (May 2008)

metal-organic compounds

bm3048 scheme

Acta Cryst. (2008). C64, m190-m193 [ doi:10.1107/S0108270108006240 ]

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)

M.-X. Xue and S.-X. Liu

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 Ni^II 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 [pi] - [pi] 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]


	Structure factor file (CIF format) (180.4 kbytes) [ doi:10.1107/S0108270108006240/bm3048Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (199.0 kbytes) [ doi:10.1107/S0108270108006240/bm3048IIsup3.hkl ] Contains datablock II

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