Synthesis and characterization studies of novel ternary complexes of Zn(II) and Ni(II) ion with norfloxacin drugs and amino acids
European Journal of Molecular & Clinical Medicine,
2020, Volume 7, Issue 9, Pages 2181-2202
Abstract
In the present work, we have synthesized twenty (20) Zn(II) and Ni(II) ion ternary complex with fluoroquinolone drug (Norfloxacin (NOR)) as primary ligand and-proline, L-glycine, L-alanine, L-histidine, L-arginine, L-threonine, L-valine, L-methionine, L-tryptophan, L-lysine , L-leucine, L-tyrosine, L-cysteine amino acid (AA) as the secondary ligand. Initial characterization studies have been done by elemental analysis to get information on the percent composition of C, H, N, O, S elements and metal, while UV-Visible spectroscopy shows the effect of metal chelation on the different inter-ligand transitions. Magnetic moment confirms the diamagnetic and paramagnetic behaviour of Zn (II) complexes and Ni (II) because there are all paired and two unpaired electrons are present in the outer orbital of the central zinc and nickel metal ion respectively. So the Zn and Ni metal shows +2 oxidation state in all synthesized complexes. While IR studies confirm the presence of all functional groups in synthesized complexes. Synthesized new ternary complexes contains [Zn(II)(NOR)(AA)] and [Ni(II)(NOR)(AA)] is1:1:1 molar ratio. The zinc and nickel ion in these 20complexes have similar coordination modes, which can be described as six coordinated octahedral geometry. Stability of the all ternary complexes was determined by thermal gravimetric analysis (TGA) in temperature ranges between 25 -900 . The carboxylic and amino acid group participate in the bonding and the interaction of the metal ion with an amino acid.
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