Spectral and thermal characterization of mixed-ligand complexes of Cu(II), Ni(II) and Co(II) with 3-methoxy-4-hydroxy benzalidene-2-furoic hydrazide as the primary ligand and with 2-hydroxy-5-chloro-2′-carboxy azobenzene as the secondary ligand

Abstract

The interaction of 3-methoxy-4-hydroxy benzalidene-2-furoic hydrazide and 2-hydroxy-5-chloro-2′-carboxy azobenzene with Cu(II), Ni(II) and Co(II) metal ions has been studied. The analytical data suggest the formation of 1:1:1 (M-L-L′) complexes (where L is C 13H 12N 2O 4 and L′ is C 13H 8N 2O 3Cl). Electrolytic conductance data (Δ M = 4.9–7.4 Ω −1 cm 2 for the chloro complexes and 69.8–85.4 Ω −1 cm 2 for the nitrate complexes) showed that the chloro complexes are non-electrolytes while the nitrate complexes are 1:1 electrolytes. Electronic spectra of these complexes show that they possess octahedral geometry. IR spectral studies show that the hydrazide ligand acts as a tridentate ligand, and the azo acts as a bidentate ligand. TG data confirm the above composition for the present complexes.