SYNTHESIS, CHARACTERIZATION AND XRD ANALYSIS OF COPPER (II) AND IRON (II) COMPLEXES OF BENZOIC ACID HYDRAZIDE.

Abstract

Schiff bases are an important class of organic compounds, which play an important role in medicinal and pharmaceutical applications. Metal complexes formed by the reactions of keto forms of Benzoic acid hydrazide (BAH) with Cu(II) and Fe(II) sulphate ions were prepared and characterized by X-ray Diffraction analysis (XRD), Fourier Transform Infrared (FTIR) and electronic absorption spectra studies. The results showed that the hydrazides reacted with the metal salts in 1:2 molar ratio in all the complexes and acts as neutral bidentate ligands. The X-ray diffraction (XRD) pattern of the metal complexes provides a detailed comparative account of the behavior of the metal complexes of hydrazide ligand metal complexes. The pattern of BAH complexes shows the main characteristics peak and broad shoulder. In view of the relative half value width (FWHM), it may be concluded that the BAH-Cu is partially crystalline and while the BAH-Fe shows an amorphous nature. The broad characteristic peak indicates the amorphous nature of the polymers. The solubility test on the ligands and its metal (II) complexes revealed their solubility in ethanol and dimethylsulphoxide (DMSO). The infrared spectra of the hydrazide showed that ?(C=O), the carbonyl stretching mode, the coupling between the in-plane bending ?(N-H) and ?(C-N) and the stretching frequency for the amino group ?(NH2) all experienced shifts to lower wave numbers in the complexes suggesting the coordination of the moieties to the metal ions. The electronic absorption spectra of Cu(II) complexes showed absorption band located at 36,496 cm-1 showing a tetrahedral geometry while Fe(II) BAH and BAH ligand show absorption band at a shoulder around 16051 cm-1 with 4A2 ? 4T1 (P) respectively consistent with a four coordinate tetrahedral geometry.