Synthesis and Spectroscopic Studies of Some Furfuraldehyde Schiff Bases Complexes

Abstract

Different types of complexes with different stoichiometries were isolated
for Co(II), Ni(II) and Cu(II). These complexes having the general formulae
[M(L)2Cl2] and [Cu(L)2]Cl2 (where M is Co(II) and Ni(II) and L is Schiff base formed
by condensation of furfuraldehyde and butylamine (FBA), or hexylamine (FHA) ).
These complexes have been prepared and characterized by elemental analysis, molar
conductivity measurements, study of the infrared and UV-visible spectra and by
magnetic susceptibility measurement. Elemental analysis suggests the stoichiometry
to be 1 : 2 (metal : ligand). For cobalt and nickel, coordination of the inorganic anions
was noticed to give hexacoordinated complexes with octahedral structure, while
copper complexes are tetracoordinated with square planar geometry. Infrared spectra
of all the complexes agree with the coordination to the central metal atom through
nitrogen of azomethine group and furan ring oxygen atoms and Schiff bases behave as
bidentate ligands with O and N donor atoms. Conductance measurements suggest the
non-electrolytic nature of the cobalt and nickel complexes and the 1:2 electrolytic
nature of the copper complexes.