Original Articles: 2013 Vol: 5 Issue: 5
EPR, IR, Mass and electronic spectroscopic studies on newly synthesized 23,24-dioxo-1,6,9,12,17,20-hexaazacyclotracosa-1,5,12,16-tetraene macrocyclic ligand (L) and its transition metal complexes
Abstract
Complexes of manganese (II), cobalt(II), nickel(II) and copper(II) complexes have been synthesized with a new
tetradentate ligand viz, 23, 24dioxo1,6,9,12,17,20 hexaazacyclotracosa1,5,12,16tetraene (L) and characterized by
the elemental analysis, molar conductance measurement, magnetic susceptibility measurements, Mass, IR,
electronic and EPR spectral studies. The molar conductance measurements of the complexes in DMF correspond to
be non electrolytic nature for Mn(II), Co(II) and Cu(II) while 1:2 electrolytes for Ni(II) complexes. Thus, these
complexes may be formulated as [M(L)X2] and [Ni(L)]X2 (Where M=Mn(II), Co(II) and Cu(II) and X=CI- and NO3
-.
On the basic of IR, electronic and EPR spectral studies an octahedral geometry has been assigned for Mn(II) and
Co(II) complexes, square planar geometry for Ni(II) and tetragonal geometry for Cu(II) complexes. In vitro the
ligand and its complexes were against two pathogenic fungi (i.e. alternaria alternata and aspergillus niger) to
assess their growth inhibiting potential.