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A novel series of complexes of the type (M(C28H18N6)X2), where M=Co(II), Ni(II), Cu(II) or Zn(II) and X = Cl - , NO3 - or CH3COO - , were syn- thesized by template condensation of isatin and 1,2-diaminobenzene in metha- nolic medium. The complexes were characterized with the help of various phy- sico-chemical techniques, such as elemental analyses, molar conductance mea- surements, magnetic measurements, and NMR, infrared and far infrared spec- tral studies. The low value of molar conductance indicates them to be non-elec- trolytes. Based on various studies, a distorted octahedral geometry may be pro- posed for all the complexes. All the synthesized macrocyclic complexes were also tested for their in vitro antibacterial activity against some pathogenic bac- terial strains. The MIC values shown by the complexes against these bacterial strains were compared with those of the standard antibiotics linezolid and ce- faclor. Some of the complexes showed good antibacterial activities.

Synthesis and characterization of divalent metal complexes of the macrocyclic ligand derived from isatin and 1,2- diaminobenzene