Metal Ion Prompted Macrocyclic Complexes Derived from Indole-2,3-dione (isatin) and O-phenylenediamine With their Spectroscopic and Antibacterial Studies

A novel series of the complexes of the type:[M(TML)X]X2; where TML is a tetradentate macrocyclic ligand; M=Cr(III), Fe(III); X=Cl–, NO3 –, OAc– has been synthesized by condensation of indole-2,3-dione (isatin) and ophenylenediamine in the methanolic medium. The complexes have been characterized with the help of various physicochemical techniques like elemental analyses, conductance measurements, magnetic measurements, infrared and electronic spectral studies. Molar conductance values indicate they are 1:2 electrolytes. Electronic spectra along with magnetic moments suggest the five coordinate square-pyramidal geometry for these complexes. The complexes were also tested for their in vitro antibacterial activities. Some of the complexes showed remarkable antibacterial activities against some of the selected bacterial strains.