THE SYNTHESIS AND CHARACTERIZATION OF A NEW TETRAOXIME AND ITS DINUCLEAR COMPLEXES

Abstract

A novel bis(dioxime) (H₄L) containing the hexaoxa macrocyclic moiety has been synthesized from the reaction of tetraaminodibenzo-18-crown-6 (1) and 2,3-butanedione monooxime (2). An octahedral cobalt(III) complex of this ligand was prepared by the oxidation of the cobalt(II) complex. The BF₂ bridged cobalt(III) complex was achieved by using the hydrogen bridged cobalt(III) complex and boron trifluoride. The structures of the bis(dioxime) and its complexes are proposed according to elemental analysis, ¹H and ¹³C NMR, IR and MS data.

Key Words:

• bis(dioxime)
• cobalt(III)
• BF₂ ⁺-capped complex
• template effect
• crown ether
• macrocycle