Synthesis and crystal structure determination of a nickel(II) complex of an acyclic pentadentate (N-5) mono Schiff base ligand.

The asymmetrical tripodal tetraamine ligand N[(CH2)(3)NH2](2)[(CH2)(2)NH2] (ppe) was condensed with 2-acetylpyridine in the presence of nickel(II) ion . In ethanol-water solution the reaction stops after the first stage of con densation, and a new nickel(II) complex of an acyclic pentadentate (NS) mon o Schiff base ligand was obtained. X-ray structure analysis of the resultin g complex, [Ni(ppe-py)(H2O)](ClO4)(2), indicates that condensation with 2-a cetylpyridine is at the propylene chain of ppe. The geometry around the nic kel ion is distorted octahedral in which the sixth co-ordination group is a solvent molecule.