COPPER(II), NICKEL(II) AND IRON(II) COMPLEXES OF 2,6-DIACETYLPYRIDINE BIS([DL-HYDROXY(PHENYL)ACETIC]HYDRAZONE) - X-RAY STRUCTURE OF A 1/2 METAL-LIGAND NICKEL-COMPLEX

2,6-Diacetylpyridine bis{[DL-hydroxy(phenyl)acetic]hydrazone} (H(4)dapm) has been synthesized and spectroscopically characterized (IR and NMR) along with six metal (Cu, Ni, Fe) complexes. The crystal structure of [Ni(H(4)dapm)(H(2)dapm)].13H(2)O has been determined by X-ray diffraction methods. It crystallizes in the monoclinic space group C2/c with a = 20.977(6), b = 20.040(6), c = 14.328(3) Angstrom, beta = 100.67(2)degrees and Z = 4. The complex has a twofold crystallographically imposed symmetry with the nickel atom in a distorted octahedral environment consisting of six nitrogen atoms from two ligand molecules.