Abstract
Antibacterial, XRD pattern and energy minimized cylindrical bonded 3-dimensional molecular structure of Schiff base [C15H20N4MCl2] complex, where M=Fe(II), Co(II), Ni(II), Cu(II) and Zn(II). [Display omitted]
•Transitional metal complexes.•Octahedral geometry around the metal ions.•XRD.•Antibacterial study by disc diffusion method.
The Schiff base complexes, MLCl2 [M=Fe(II), Co(II), Ni(II), Cu(II) and Zn(II)] have been synthesized by the template reaction of respective metal ions with 2-acetylpyrrole and 1,3-diaminopropane in 1:2:1M ratio. The complexes have been characterized by elemental analyses, ESI – mass, NMR (1H and 13C), IR, XRD, electronic and EPR spectral studies, magnetic susceptibility and molar conductance measurements. These studies show that all the complexes have octahedral arrangement around the metal ions. The molar conductance measurements of all the complexes in DMSO indicate their non-electrolytic nature. The complexes were screened for their antibacterial activity in vitro against Gram-positive (Streptococcus pyogenes) and Gram-negative (Klebsiella pneumoniae) bacteria. Among the metal complexes studied the copper complex [CuLCl2], showed highest antibacterial activity nearly equal to standard drug ciprofloxacin. Other complexes also showed considerable antibacterial activity. The relative order of activity against S. Pyogenes is as Cu(II)>Zn(II)>Co(II)=Fe(II)>Ni(II) and with K. Pneumonia is as Cu(II)>Co(II)>Zn(II)>Fe(II)>Ni(II).
