Synthesis and Structure of (17-Hydroxy-4,4,9,9,11- pentamethyl-5,8,12,13,15-pentaazaheptadec- 11-en-2-one hydrazone)nickel(II) Perchlorate; a Compound with a Hexadentate gem-Diamine Ligand

Abstract

(4,4,9,9-Tetramethyl-5,8-diazadodecane-2,11-dione dihydrazone)nickel(II) perchlorate reacts with 2- aminoethanol and methanal to form blue-violet (17-hydroxy-4,4,9,9,11-pentamethyl-5,8,12,13,15- pentaazaheptadec-11-en-2-one hydrazone)nickel(II) perchlorate. The structure of a methanol solvate was determined [C₁₈H₄₃Cl₂N₇NiO₁₀, M_r 647·2, triclinic, space group P ^-1, a 8·992(7), b 10·86(2), c 15·02(1) Å, α 79·95(2), β 76·85(5), γ 78·83(2)°, Z 2, R 0·0637 for 2992 reflections]. The ligand has one terminal hydrazone function of the starting material linked to the 2-aminoethanol residue by a gem-diamine function derived from methanal. The ligand is hexadentate, with the triplet ground state nickel(II) ion in octahedral coordination by three secondary amine and two hydrazone nitrogen atoms and a hydroxy oxygen atom, with the terminal hydrazone nitrogen and the hydroxy oxygen atoms coordinated trans.