Template synthesis of macrocyclic complexes and their spectroscopic and antibacterial studies

Abstract

A new series of macrocyclic complexes of type [M(TML)X]X₂, where M = Cr(III), Fe(III), TML is tetradentate macrocyclic ligand, and X = Cl⁻, NO₃⁻, CH₃COO⁻, have been synthesized by condensation of isatin and ethylenediamine in the presence of metal salt. The complexes were synthesized by both conventional and microwave methods. The complexes have been characterized with the help of elemental analysis, conductance measurement, magnetic measurement, and infrared, far infrared, and electronic spectral studies. Molar conductance values indicate them to be 1:2 electrolytes. Electronic spectra along with magnetic moments suggest five-coordinate square pyramidal geometry for these complexes. The complexes were also tested for their in vitro antibacterial activity. Some of the complexes showed satisfactory antibacterial activitiy.

Keywords::

• Macrocyclic complexes
• antibacterial activity
• minimum inhibitory concentration

Acknowledgments

Thanks are also due to the authorities of NIT, Kurukshetra for providing necessary facilities. We are highly thankful to Jitender Singh for carrying out studies of the biological activities of the synthesized macrocyclic complexes.

Declaration of interest: One of the authors (D.P.S.) thanks the University Grants Commission, New Delhi for financial support in the form of a Major Research Project.