Syntheses of new schiff bases derived from 2-hydrazinoethanol and salicylaldehyde, substituted salicylaldehydes and their copper(I), copper(II) and oxovanadium(IV) complexes

Abstract

Several new complexes ML (where M=CuII or VIV and LH2=X-C6H4(OH) CH=N-NH(CH2)2OH where X=H, 5-chloro, 5-bromo, 5-nitro, 3-ethoxy or 5,6-benzo) have been synthesized and characterized on the basis of elemental analysis, electronic and infrared spectra and magnetic susceptibility measurements. At pH ∼ 5 copper(II) is reduced to copper(I) and a diamagnetic complex, CuLH · H2O is formed. At higher pH (∼8) the copper(II) complex CuL is formed. The copper(II) and oxovanadium(IV) complexes exhibit low magnetic moments (μeff=1.22–1.32 B.M. for CuII and 1.27–1.39 B.M. for VIV complexes) and may be associated in the solid state. A square pyramidal structure is proposed for the VIV complexes and a square planar structure for the CuII complexes.