Macrocyclic Metal Chelates of Divalent Iron, Cobalt and Nickel Derived from Dihydrazone and Dicarbonyl Compounds

Diacetyldilydrazone and 2,6-diacetylpyridine react in presence of divalent iron, cobalt and nickel salts to from chelates of 22 membered N₆, hexadentatemacrocycle. Chelates are characterized as distorted octahedral of the type [M(C₂₆H₃₀N₁₀)] X₂ where M = Fe (II). Co (II) NI (II) and X = CI, Br, NO₃ or NCS. The macrocycle coordinate through azomethine and pyridine nitrogen atoms which are bridged by diacetyl moieties. The chelates are characterized by electrical conductance, molecular weight, electronic and infrared spectral studies.