Syntheses of NN′-bis(4′-benzo[15-crown-5])diaminoglyoxime and its complexes with copper(II), nickel(II), cobalt(II), cobalt(III), palladium(II), platinum(II), and uranyl(VI)

Abstract

NN′-Bis(4′-benzo[15-crown-5])diaminoglyoxime (H₂L) has been prepared as a bis(sodium chloride) salt from anti-dichloroglyoxime, 4′-aminobenzo[15-crown-5], and sodium bicarbonate in ethanol. Copper(II), nickel(II), and cobalt(II) complexes of H₂L·2NaCl have a metal–ligand ratio of 1 : 2 and the ligand co-ordinates through the two N atoms, as do most of the vic-dioximes. [Pt(HL)₂·4NaClO₄] and [Pd(HL)₂·4NaClO₄] complexes form six-membered chelate rings and co-ordinate through N and O atoms. [Co(HL)₂(L′)Cl·4NaClO₄] has been prepared with L′= triphenylphosphine or pyridine, together with a chloride ion, as axial ligands. H₂L·2NaX (X = Cl^– or ClO₄^–) reacts with UO₂(O₂CMe)₂·2H₂O to give complexes with a metal–ligand ratio of 1 : 1. All these complexes are soluble in water; n.m.r., i.r., and u.v.–visible data are presented.