Physicochemical and Biological Characterization of Transition Metal Complexes with a Nitrogen Donor Tetra-dentate Novel Macrocyclic Ligand |
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Authors: | Lokesh Kumar Gupta Sulekh Chandra |
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Institution: | (1) Department of Chemistry, Zakir Husain College (University of Delhi), JLN-Marg, New Delhi, 110 002, India |
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Abstract: | A novel tetradentate nitrogen donor N4] macrocyclic ligand, i.e. 3,5,13,15,21,22-hexaaza-2,6,12,16-tetramethyl-4,14-dithia-tricyclo15.3.1.1(7–11)]docosane-1(21),2,5,7,9,11(22),12,15,17,19-decaene,
has been synthesized. Mn(II), Co(II), Ni(II) and Cu(II) complexes with this ligand have been prepared and subjected to elemental
analyses, molar conductance measurements, magnetic susceptibility measurements, mass, 1H-n.m.r. (Ligand), i.r., electronic, and e.p.r. spectral studies. On the basis of molar conductance the complexes may be formulated
as M(L)X2] and Ni(L)]X2 where M = Mn(II), Co(II) and Cu(II), and X = Cl− and NO3−] due to their nonelectrolytic nature in dimethylsulphoxide (DMSO). All the complexes are of the high spin type and are six
coordinated. On the basis of i.r., electronic and e.p.r. spectral studies an octahedral geometry has been assigned to Mn(II)
and Co(II), square planar for Ni(II) complexes, and tetragonal for Cu(II) complexes. The antimicrobial activities of the ligand
and its complexes, as growth inhibiting agents, have been screened in vitro against several species of bacteria and plant pathogenic fungi. |
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