Physicochemical Studies of the Metal Complexes of N-(2-Hydroxy-1-Naphthalidene) anthranilic acid and N-(2-Hydroxy-1-Naphthalidene )-β-alanine (Schiff bases)

Department of Chemistry, University of Jodhpur, Jodhpur

Manuscript received 15 February 1973; revised 13 June 1973; accepted 31 July 1978

N-(2-Hydroxy-1-Naphthalidene)anthranilic acid (H₂NA) and N- (2-Hydroxyl-1-Naphthalidene)- β-alanine (H₂NβA) Schiff bases form solid complexes with Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Pd(II), Cd(II) and UO₂(II). Elemental analysis, molecular weight magnetic data and electronic absorption spectra conform to 1 : 1 metal-ligand stoichiometry of these compounds. Excepting Cu(II) complex which exists as a dimer, the remaining complexes exist as monomers in the solid state. The dimeric nature of the Cu(II) is explained by assigning a nonplanar bridged structure involving the two cupric ions at the opposite ends of an eight-membered ring so that superex­change is prevented between the copper atoms. The presence of nitrogen atom of the azomethine group in β-position to the carboxylic group is responsible for the behaviour of the two Schiff bases.