Terpolymer Chelates: Synthesis, Characterization, and Biological Applications

Abstract

Terpolymer ligand was synthesized from 8-hydroxyquinoline and anthranilic acid with formaldehyde (QAF) by solution condensation in an acid medium. Polychelates of Cu(II), Ni(II), Zn(II), and Pb(II) were prepared using the terpolymer as ligand. The ligand and chelates were characterized by elemental analysis, TGA, DSC, FTIR, electronic absorption, and NMR spectroscopy. The activation energy was calculated for the ligand and its polychelates formation by the Freeman-Carroll method. The ligand and its polychelates possess antimicrobial activity for certain bacteria such as Staphylococcus aureus, Escherichia coli, and fungi Aspergillus niger and Candida albicans. The surface morphology of the ligand and its polychelates was established by SEM.

Keywords:

• antimicrobial screening
• morphology
• polychelates
• polycondensation
• thermogravimetric analysis

The authors thank the Management and Principal of Jamal Mohamed College, Tiruchirappalli, Tamil Nadu for their support and encouragement.

Notes

*Maximum decomposition temperature; **Temperature of 50% weight loss.

Standard (Ciprofloxacin −5 µg for bacteria, Nystatin-10 µg for fungi); % inhibition: + (10–25%), ++ (26–40%), +++ (41–55%), ++++ (56–70%), +++++ (71–85%), ++++++ (86–100%).