• Jahan Ara Khatoon
• Shamshad Ahmad K han

A novel series of tetraaza macrocyclic Zn(II) complexes [ZnLX2] (where L= N4 donor macrocyclic ligands) and (X= Cl ─, NO3─ or H2O) have been synthesized and characterized by elemental analysis, molar conductance, magnetic susceptibility measurements, solubility, infrared and ESR.The free Schiff base ligands and their metal complexes were screened for their antimicrobial activity against both Gram-positive and Gram-negative bacteria. It has been found that all the complexes are antimicrobially active and so higher activity than the free ligands. A very strong band around at 1640 cm-1 is characteristics of the azomethine nitrogen present in the Schiff base ligands. This was shifted to 1634-1625 cm-1 in the complexes, which indicates the coordination of the metal to the azomethine nitrogen. The molar conductivity data of the complexes in DMSO indicate they are non-electrolytes. On the basis of magnetic susceptibility and electronic spectral study, geometry of complexes was proposed to be octahedral.

Benzene-1,2-diamine, pentane-2,4-dione, zinc salt, microbiological activities.

"Synthesis, Characterization and Microbiological Studies of Zinc(II) Tetraaza Macrocyclic Complexes", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 1, page no.540-546, January-2019, Available :http://www.jetir.org/papers/JETIR1901E69.pdf

"Synthesis, Characterization and Microbiological Studies of Zinc(II) Tetraaza Macrocyclic Complexes", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 1, page no. pp540-546, January-2019, Available at : http://www.jetir.org/papers/JETIR1901E69.pdf