Synthesis and Characterization of a Schif Base and Its Metals (ZN (II) and MO (VI)) Complexes Derived From 2-Hydroxy-4-Methoxybenzaldehyde

H.A. Usman¹ , A. B. Garba² , M.A. Sani³ , G.A. Yusuf⁴

Section:Research Paper, Product Type: Journal-Paper
Vol.5 , Issue.9 , pp.1-7, Sep-2019

Online published on Sep 30, 2019

Copyright © H.A. Usman, A. B. Garba, M.A. Sani, G.A. Yusuf . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
In the present study, a new series of Zinc(II) and Mo (VI) complexes with two newly synthesized Schiff base ligands derived from 2-Hydroxy-4-methoxybenzaldehyde nicotinoylhydrazone monohydrate (H2hmbn.H2O) and 2-Hydroxy-4-methoxybenzaldehyde benzoylhydrazone (H2hmbb) have been prepared. All the two free hydrazones (ligands) that were synthesized acts as a tridentate dianionic ONO donor towards the four complex centers. The conductance measurements in DMF of all the four metal complexes, suggest that they are non-electrolytes. Singlets found in the region 12-14 ppm of the free hydrazones indicates the present of iminol in solution. Also the NMR of zinc complexes was not as a result of its poor solubility. In the FTIR spectra of the free hydrazones, the bands due to carbonyl group were observed in the region 1630-1650 cm-1 and these are absent in the spectra of the complexes suggesting enolization and deprotonation of ligands, whereas for the metal complexes, in compounds AA, AC and AD broad bands observed at 3409 and 3417 cm-1 indicates the present of lattice water. In the thermal analysis, there is a weight loss due to lattice in compound AA, AC and AD.

Key-Words / Index Term :
Schiff base, azomethine, complex, molybdenum, Zinc

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