Synthesis and characterisation of aroylhydrazone complexes derived from some piperidin-4-ones

Abstract

Ni(II) and Cu(II) complexes of the types [M(L¹)₂](NO₃)₂.nH₂O, [M (HL²)₂] (NO₃)₂ and [M₂(HL³)(NO₃)₄].nH₂O [L¹=<i>cis</i>-2,6-diphenylpiperidin -4-one benzoylhydrazone (DPBH), HL²= <i>cis</i>-2,6-diphenylpiperidin -4-one salicyloylhydrazone (DPSH ) and HL³= <i>trans</i>-3-meth yl-<i>cis</i>-2,6-diphenylpiperidin -4-one salicyloylhydrazone (MDPSH)] have been synthesized and characterized on the basis of elemental, electronic, IR and ESR spectral analyses and also by conductivity measurements, magnetic moment measurements and thermogravimetric analyses (TGA/DTA).<i> </i>The results reflect coordination of the ligands through >C=O and >C=N groups. In bimetallic MDPSH complexes coordination occurs through phenolic oxygen and amide nitrogen atoms. The powder X-ray diffraction analysis reveals that DPBH and DPSH complexes of Ni(II) crystallize in simple cubic unit lattice.