Synthesis and Characterization of Co(II), Ni(II) and Cu(II) Complexes with a Macrocyclic Ligand 5,7,12,14-Tetramethyldibenzo (b, i)-1,4,8,11-Tetraaza Cyclotetra Dec-2,4,6,9,11,13-Hexaene

Abstract

A series of complexes of the type MLB₂ {M = Co(II), Ni(II)
and Cu(II), B = H₂O, pyridine and  α, β or  γ-picolines} have been
synthesised with the macrocyclic ligand, H₂L. Characterisation of
the ligand as well as complexes has been done on the basis of
elemental analysis, spectral studies, conductivity and magnetic susceptibility
measurements. The ligand has been found to coordinate
through all the four nitrogen atoms. The complexes are found to be
octahedral. The remaining two coordination sites are satisfied by
oxygen of H₂O or nitrogen of nitrogen donor molecules such as
pyridine and different picolines.