Abstract
New Schiff bases Ni (II) complexes are synthesized from the condensation of an ethylenediamine compound with salicylicacid compounds and these coordinate to metal ions via substituted salicyladehydeschiff base and their nickel complexes possess remarkable properties as catalysts in various biological systems, antioxidant activities, antiasthmatic and diabetic activities, anticancer activities, antitumor and cytotoxic activities, pharmaceutical fields. Schiff base ligands and their coordination chemistry of nickel attract much attention because of its biological relevance and its own interesting of coordination chemistry. This review summarizes the application of nickel schiff bases complexes and structures were confirmed by IR, 1HNMR, 13CNMR and Mass Spectra.
Highlights
The new Schiff base nickel complex has been fast developing on account of the wide variety of possible structures for the ligands depending upon the aldehydes and amines
A band at 1692 cm-1 in free Schiff base is due to C = N vibration
The shifting of this group to lower frequency (1654-1690 cm-1) in the metal complexes when compared to free ligand, suggests the coordination of metal ion through nitrogen atom [13]
Summary
The new Schiff base nickel complex has been fast developing on account of the wide variety of possible structures for the ligands depending upon the aldehydes and amines. 3.General experimental procedure for the preparation of the complexes A mixture of the schiff base under investigation(0.01 mol) in 25 ml ethanol and the same amount of the same solvent of metal salt (0.01 mol) (MX2, where M= Ni (II), Co (II), Cu (II) and Mn(II) ; X=Cl/Br/acetates ) were refluxed for 3 hours at 80-90°C on water bath. Ii).The complex, C34H34Cl2CoN4Ni2O4 Solid.M.p. 131 ̊C; M.Wt.809.88; Anal.Calc for C34H34Cl2CoN4Ni2O4: C, 50.42; H, 4.23; N, 6.92; O, 7.90; % found: C, 50.65; H, 4.13; N, 6.70; O, 7.54%; Main IR Peaks (KBr, cm-1): ν(C=N)1654. Iii).The complex, C34H34Br2CoN4Ni2O4 Brown solid, M.p. 128 ̊C; M.Wt.898.78; Anal.Calc.forC34H34Br2CoN4Ni2O4: C, 45.44; H, 3.81; N, 6.23; O, 7.12; % Found: C, 45.20; H, 4.47; N, 6.43; O, 7.05%; Main IR Peaks (KBr, cm1): ν(C=N)1647. Wt.: 898.54; Anal.Calc. for C34H34Br2N4Ni3O4: C, 45.45; H, 3.81; N, 6.24; O, 7.12%; C, 45.56; H, 3.76; N, 6.62; O, 7.51%; Main IR Peaks (KBr,Cm-1): ν(C=N)1662
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