Synthesis of 4′,5′-Bis(salicylideneimino)benzo[15-crown-5] and Its Complexes with Uranyl(VI), Copper(II), Nickel(II), and Cobalt(II)

Abstract

4′,5′-Bis(salicylideneimino)benzo{15-crown-5} (SALH₂) has been synthesized from 4′,5′-diaminobenzo{15-crown-5} and salicylaldehyde. The crystalline sodium nitrate complex of the ligand (SALH₂.NaNO₃.H₂O) has also been isolated. As an N₂O₂-donor ligand, SALH₂ forms 1:1 metal complexes with various metals {SAL(M)xH₂O where M = UO₂(VI), Cu(II), or Ni(II)}. The octahedral Co(II) complex of SALH₂ is capable of binding molecular oxygen. Also prepared were the complexes which simultaneously contain both sodium and transition metal ion. ¹H-n.m.r., i.r., u.v.-visible, and conductance data are presented.