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.