Metal complexes of a New tripodal multidentate Ligand-Structural investigations on Ni(II) and Zn(II) Complexes
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Date
2009-07
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Addis Ababa Universty
Abstract
A new multidentate tripodal ligand 2, 4, 6-tris (N-Salicylidene hydrazino)-s-Triazine
(TSHSTZ) was synthesized by nucleophilic substitution reaction between 1-(2-hydroxy
benzylidene) hydrazine (HBH) and cyanuric chloride in 3:1 mole ratio. The precursor 1-
(2-hydroxy benzylidene) hydrazine (HBH) was prepared in early stage of the ligand
preparation by simple shiff base condensation reaction between salicylaldehyde and
hydrazine sulfate. The ligand (TSHSTZ) behaves as a dibasic ONN donor towards Ni(II)
and tri basic tris-ONN donor towards Zn(II) .The Ni(II) and Zn(II) complexes of the
ligand(TSHSTZ) were synthesized by using 1:3 ligand to metal mole ratio in
chloroform/Methanol medium. The ligand and complexes were investigated by NMR, IR,
UV-Vis and AAS techniques. Furthermore, conductivity and magnetic susceptibility
measurements were carried out for the complexes. Ring nitrogen as well as the bridging
nitrogen of hydrazine in TSHSTZ were proposed as metal binding centers. The AAS data
reveals 1:3 ligand to metal ratio for Zn (II) complex, where as 1:1 ligand to metal ratio
for Ni (II) complex. Conductivity measurement tells that both the complexes are nonelectrolytes
and Magnetic moment of Ni(2.83B.M) indicates octahedral geometry for
Ni(II) complex and NMR data ,in addition to other spectroscopic data together with
acetate test and conductance result suggest tetrahedral geometry for Zn(II) complex.
Key words: cyanuric chloride, salicylaldhyde, hydrazine sulfate,1-(2-hydroxy
benzylidene) hydrazine,
Key words: cyanuric chloride, salicylaldhyde, hydrazine sulfate,1-(2-hydroxy
benzylidene) hydrazine, 2, 4, 6-tris (N-Salicylidene hydrazino)-s-Triazine
Zn(II) complex, Ni(II) complex.
Description
Keywords
cyanuric chloride, salicylaldhyde, hydrazine sulfate,1-(2-hydroxy benzylidene) hydrazine; 2; 4; 6-tris (N-Salicylidene hydrazino)-s-Triazine Zn(II) complex; Ni(II) complex.