SYNTHESIS AND STRUCTURE OF TAMETHYL-5,8,12,13,15-PENTAAZAHEPTADEC-11-EN-2-ONE HYDRAZONE)NICKEL(II) PERCHLORATE - A COMPOUND WITH A HEXADENTATE GEM-DIAMINE LIGAND

(4,4,9,9-Tetramethyl-5,S-diazadodecane-2,11-dione dihydrazone)nickel(I I) perchlorate reacts with 2-aminoethanol and methanal to form blue-vi olet tamethyl-5,8,12,13,15-pentaazaheptadec-11-en-2-one hydrazone)nick el(II) perchlorate. The structure of a methanol solvate was determined [C18H48Cl2N7NiO10, M(r) 647.2, triclinic, space group <P(1)over bar>, a 8.992(7), b 10.86(2), c 15.02(1) Angstrom, alpha 79.95(2), beta 76. 85(5), gamma 78.83(2)degrees, Z 2, R 0.0637 for 2992 reflections]. The ligand has one terminal hydrazone function of the starting material l inked to the 2-aminoethanol residue by a gem-diamine function derived from methanal. The ligand is hexadentate, with the triplet ground stat e nickel(II) ion in octahedral coordination by three secondary amine a nd two hydrazone nitrogen atoms and a hydroxy oxygen atom, with the te rminal hydrazone nitrogen and the hydroxy oxygen atoms coordinated tra ns.