Coordination Behaviour of Some New Schiff Bases Towards Co(II), Ni(II) and Cu(II)

Abstract

Some new Schiff bases are synthesised from 2-pyridinecarboxaldehyde
with 2-aminobenzimidazole(L₁), 3-amino-1,2,4-triazole(L₂) and 2-amino-
3-hydroxypyridine(L₃). Cobalt(II) chloride and nickel(II) chloride complexes
of Schiff bases have the stoichiometry [M(L)(H₂O)] Cl₂(M ═ Co(II)
and Ni(II), L ═ Schiff base) while copper(II) chloride complexes
have the stoichiometry [Cu(L)₂]Cl₂.H₂O. The complex compounds have
been isolated and characterized by elemental analyses, electrical conductivity,
magnetic measurements, and infrared spectral measurements.
All Schiff bases act as tridentate ligand towards Co(II) and Ni(II), but
in case of Cu(II) complexes, they behave as bidentate ligand.