Four new complexes of Au(III), Pd(II), Ni(II), and Cu(II) ions were synthesized, derived from a novel heterocyclic ligand (L) that has both triazole and tetrazole rings. The ligand synthesis was through successive steps to achieve both heterocyclic rings. The synthesized compounds were characterized using conventional techniques like infrared, ultra violet—visible and proton/carbon nuclear magnetic resonance spectroscopy, metal and thermal analyses, and molar conductivity. All complexes were suggested to have square planar geometry, gold, nickel, and palladium complexes were salts while copper neutral complexes have the chemical formulas; [AuL2]Cl.2H2O, [PdL2]Cl2.2H2O, [NiL2]Cl2.2H2O, and [CuL2]. The cytotoxic effect was studied on breast cancer cell line (MCF‐7 cell line) at different concentrations by using the 3‐(4,5‐dimethylthiazol‐2‐yl)‐2,5‐diphenyltetrazolium bromide assay method, for the ligand (L) and complexes. The results showed that gold(III) and nickel(II) complexes have the highest cytotoxicity among all compounds against cancer cell lines.

This research is for academic understanding to work out new ligand behavior4-({(5-(4-hydroxyphenyl)-3-sulfanyl-1H-1,2,4-triazol-1-yl)amino}(1H-tetrazol-5-yl)methyl)-2-methoxyphenol (L) with gold (III) and nickel (II) metal ions. Ligand (L) has been synthesized from cyclization of the interaction of (4-hydroxy-3-methoxyphenyl){[5-(4-hydroxyphenyl)-3-sulfanyl-1H-1,2,4-triazol-1-yl]amino}acetonitrile (F) with sodium azide. α-Amino nitrile compound (F) intern synthesized from interaction of aldehyde amine and KCN acidic medium as three components one put reaction. The presence of well oriented donor atoms (N2-type) of ligand (L) interacted with gold (III) and nickel (II) ions under reflux to prepare [1:2] [M:L]Cl electrolytic complexes, the complexes [Au (L)3]Cl3and [Ni (L)2]Cl2were suggested to have square planar geometry. The resulting products were characterized via technical1H-NMR, UV-Vis, IR spectroscopy, conductivity and EDX. The cytotoxic effect was studied on a breast cancer cell line (MCF-7 cell line). At different concentrations for both complexes. The results showed that gold(III) complex has higher cytotoxicity than nickel(II) complex against cancer cell line.

The synthesis and characterization of new complexes of Fe(II), Co(II), Ni(II)

The mixed ligand complexes of Co (II), Ni (II) and Cu (II) with histidine (His.) and 8hydroxyquinoline (Qui.) have been synthesized and characterized.The resulting complexes were characterized by vibrational and electronic spectral data, thermogravimetric studies , metal analysis and molar conductance measurements. The histidine acts as tridentate ligand, coordinating through the two nitrogen atoms of imidazole ring and the amino group and carboxylate oxygen whereas 8-hydroxyquinoline shows a bidentate nature and the coordination occurs through nitrogen of imine group and oxygen of phenol group. The experimental data suggest that a mononuclear octahedral structure with general formula [M (His.)(Qui.) H 2 O ] where M= Co (II), Ni (II) and [Cu (His.)(Qui.)H 2 O] .H 2 O, thermo gravimetric studies reveal the presence of coordinated water molecules in all complexes. The molar conductance measurements reveal non-electrolytic nature of complexes.

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