Syntheses of NN′-bis(4′-benzo15-crown-5)diaminoglyoxime and its complexes with copper( II ), nickel( II ), cobalt( II ), cobalt( III ), palladium( II ), platinum( II ), and uranyl( VI )

NN′-Bis(4′-benzo15-crown-5)diaminoglyoxime (H2L) has been prepared as a bis(sodium chloride) salt from anti-dichloroglyoxime, 4′-aminobenzo15-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.