Synthesis and Characterization of Nickel(II) Complexes of Nitrogen based Ligands of Type N,N,N′,N′-tetrakis(2-Pyridylmethyl)alkanediamine

Abstract

Hexadentate ligand of the type N,N,N′,N′-tetrakis(2-pyridylmethyl)alkanediamine (where alkane is butane (L1), hexane (L2) and octane (L3) reacted with Ni(ClO4)2·6H2O (stoichiometry 1:1) in alcoholic solutions yielding mononuclear complexes of the type [Ni(L)](ClO4)2·xH2O. The ligand L1 reacted with Ni(ClO4)2·6H2O in ethanol medium to give a violet powder of [Ni(L1)](ClO4)2·3H2O. The other mononuclear nickel(II) complexes using L2 and L3 were synthesized in methanol solution to give violet powders of [Ni(L2)](ClO4)2·2H2O and [Ni(L3)](ClO4)2·2H2O, respectively. All the three complexes were characterized by IR and elemental analysis. The X-ray crystallographic results for the purple crystals of [Ni(L1)](ClO4)2·3H2O shows the octahedral geometry on the Ni(II) ions together with the tetrahedral perchlorate anions separated from the [Ni(L1)]2+ cation. The crystal structure data show monoclinic space group P 21/c; a = 17.1748(10), b = 9.8273(6), c = 17.8146(10) Å; α = 90º, β = 95.0200(10)º, γ = 90º; V = 2995.2(3) Å3 , Z = 4.