Antimicrobial and antioxidant activity evaluation of Co(II), Ni(II), Cu(II) and Zn(II) complexes with 15-thia-3,4,9,10-tetraazabicyclo[10.2.1]pentadeca-1(14),2,10,12-tetraene-5,8-dione

Macrocyclic Schiff base complexes as potent antimicrobial agents: Synthesis, characterization and biological studies

A series of Cu^II, Co^II, Zn^II and Ni^II, complexes of 3⁴,7⁴-dimethyl-1²,1⁵,5²,5⁵-tetrahydro-2,4,6,8-tetraaza-1,5(2,5)-difurana-3,7(1,2)-dibenzenacyclooctaphane based ligand have been synthesized by template methodology. Characterization of the synthesized complexes has been carried out with the help of various physicochemical and spectroscopic techniques like Infra-Red, ESI-MS, ESR, UV-visible, CHN (elemental analyses), molar conductance, magnetic moment and NMR. Antimicrobial efficacy of the newly designed macrocyclic complexes has performed by the assistance of agar well diffusion method. In-vitro hemolytic and DNA binding studies were also performed in order to analyze or interpret the mode and binding efficiencies as well as the % hemolysis exhibited by the complexes. DFT/TD-DFT studies were carried out in order to elucidate the better insight into the structural parameters. Energy minimization and quantum chemical parameters were calculated using Gaussian09W program.