Synthesis of phenoxo-bridged dicopper(II) complexes of N-(2-aminoalkyl)salicylaldimines and their use in the formation of monohalogeno-complexes and non-symmetrical quadridentate Schiff-base complexes

Abstract

Phenoxo-bridged dicopper(II) complexes, [Cu₂L¹₂][ClO₄]₂·2H₂O, of N-(2-aminoethyl)salicylaldimine (HL¹) and its analogues have been synthesised by a high dilution method. These compounds react with p-substituted o-acylphenols and 1,3-diketones to form non-symmetrical quadridentate Schiff-base complexes. The phenoxo-bridge in [Cu₂L¹₂][ClO₄]₂·2H₂O can be split by strong nucleophiles, yielding the monomeric compounds [CuL¹(X)](X = Cl, Br, I, N₃, or NCS). Similar reactions occur with [Cu₂L⁷₂][ClO₄]₂·2H₂O, where HL⁷is the reduced version of HL¹.