SYNTHESIS, SPECTRAL STUDIES OF METAL (II) COMPLEXES
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| Title | SYNTHESIS, SPECTRAL STUDIES OF METAL (II) COMPLEXES |
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| Abstract | Benzoyl acetic acid hydrazide [BAH] were synthesized and characterized by elemental analysis, melting point, and infrared spectral studies. Their complexes with Copper (II) , Nickel (II) and Cobalt (II) were also synthesized and characterized by elemental analysis, melting point, conductance, infrared studies, and ultra violet spectroscopy . The results showed that the ligand reacted with the metal salts of nickel (II) copper (II) and cobalt (II) in 1:2 molar ratio. The infrared spectra of the of the hydrazide [BAH] showed that ν(C=O) the carbonyl stretching mode , the coupling between the in-plane bending δ(N-H) and ʋ(C-N) and the stretching frequency for the amino group ʋ(NH2) . All experienced bathochromic shifts in the complexes suggesting the coordination of the moieties to the metal ions. The Infrared data also suggest that the ligands act as neutral bidentate donors ligating through the carbonyl O and the amino nitrogen of the ligand. The broad band in the region 3350-3560 cm-1 is accorded to ʋ(O-H) stretching vibrations, a feature indicating the presence of acid. The electronic spectra of the nickel (II) complexes showed d-d bands in the regions 24390-25000, 16528-16667, and 12987-13333 cm−1. These are assigned to the spin-allowed transitions 3A2g(F)→3T2g(F), 3A2g(F)→3T1g(F), and 3A2g(F)→3T1g(P), respectively, consistent with their well-defined octahedral configuration. All the copper(II) complexes experienced a single broad band between 13,966- 16,233 cm-1assigned to a 2T2 → 2E transition for a tetrahedral geometry. The absorption spectra of Cobalt (II) complexes showed 4T1g → 4T2g transitions at 14,706 -15,924 cm-1 with a shoulder each at 16,077 cm-1 16,051 cm-1 and 15,924 respectively. The 4T1g → 4T1g (P) were observed at 18,382 cm-1 ,18,484 cm-1 , and 19,230 cm-1 for Co[BAH]2Cl2, Co[BAH]2Br2, and Co[BAH]2SO4 respectively consistent with a six coordinate octahedral geometry. Further conclusive evidence of the coordination of these hydrazide with the metal(II) ions was shown by the appearance of new bands due to ν(M-N) and ν(M-O) in the metal(II) complexes, this is supported by the elemental analysis studies. The anions is in the outer coordination sphere in all the complexes. |
| Publisher | World Science Publisher |
| Date | 2012-05-28 |
| Source | 2167-0854 |
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