Crystal and molecular structure of 2-acetylpyridine[9-(2-pyridyl)-4,8-diazadec-8-en-1-amine]nickel(II) diperchlorate

Crystals of the title compound (I) are monoclinic, space group P21/c, a= 16.591(10), b= 10203(20), c= 16.164(10)Å, β= 102.65(3)°, Z= 4. The structure was refined by full-matrix least-squares to R 0.076 for 2343 unique reflexions measured by diffractometer. In the cation there is distorted octahedral co-ordination of nickel by the quadridentate ligand and a 2-acetyipyridine molecule in the keto-form. There is evidence for disorder of the perchlorate anions. Ni–N Distances are 2.07–2.09 Å for the quadridentate ligand; for the acetylpyridine, Ni–N 2.138(11), Ni–O 2.124(11), and CO 1.236 (13)Å.