Spectroscopic studies on Mn(II), Co(II), Ni(II), and Cu(II) complexes with N-donor tetradentate (N4) macrocyclic ligand derived from ethylcinnamate moiety

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Manganese(II), cobalt(II), nickel(II), and copper(II) complexes are synthesized with a novel tetradentate ligand, viz. 1,5,9,13-tetraaza-6,14-dioxo-8,16-diphenylcyclohexadecane (L) and characterized by the elemental analysis, molar conductance measurements, magnetic susceptibility measurements, mass, 1H NMR, IR, electronic, and EPR spectral studies. The molar conductance measurements of the complexes in DMSO correspond to be nonelectrolyte nature for Mn(II), Co(II), and Cu(II) whereas 1:2 electrolytes for Ni(II) complexes. Thus, these complexes may be formulated as [M(L)X 2] and [Ni(L)]X 2, respectively (where M=Mn(II), Co(II), and Cu(II) and X=Cl and NO 3 ). On the basis of IR, electronic, and EPR spectral studies an octahedral geometry has been assigned for Mn(II) and Co(II) complexes, square-planar for Ni(II) whereas tetragonal for Cu(II) complexes. The ligand and its complexes were also evaluated against the growth of bacteria and pathogenic fungi in vitro.

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Experimental/ cobalt compounds copper compounds infrared spectra magnesium compounds magnetic susceptibility mass spectra microorganisms nickel compounds organometallic compounds paramagnetic resonance proton magnetic resonance/ manganese(II) complex Mn(II) complex cobalt(II) complex Co(II) complex nickel(II) complex Ni(II) complex copper(II) complex Cu(II) complex N-donor tetradentate macrocyclic ligand ethylcinnamate moiety 1,5,9,13-tetraaza-6,14-dioxo-8,16-diphenylcyclohexadecane elemental analysis molar conductance measurements magnetic susceptibility measurements mass spectra 1H NMR spectra IR spectra electronic spectra EPR spectra DMSO solution nonelectrolytic nature octahedral geometry square-planar geometry tetragonal geometry bacteria growth pathogenic fungi/ A7830J Infrared and Raman spectra in organic crystals A7660 Nuclear magnetic resonance and relaxation (condensed matter) A7630 Electron paramagnetic resonance and relaxation (condensed matter)