Synthesis and Characterization of Some 16- Membered Tetraimine Macrocyclic Complexes

H. Taher, Najla

	Synthesis and Characterization of Some 16- Membered Tetraimine Macrocyclic Complexes
Tikrit Journal of Pure Science
Article 1, Volume 16, Issue 1, 2011, Pages 102-105
Author
Najla H. Taher
Abstract
[2+2] Condensation of thiosemicarbazide with 2,5-hexanedione in a 1:1 molar ratio in aqueous solution at room temperature resulted in the formation of a novel Schiff base tetraimine macrocyclic ligand, (L): 5,8, 13, 16 – tetramethyl – dione -3, 10 – dithia – 1, 2, 4, 9, 11, 12-hexaaza cyclohexadeca-1,4,9,12-tetraene (fig.1) or may be 5 , 8 , 13, 16 – tetramethyl – dione -2, 10 – dithia – 1, 3, 4, 9, 11, 12-hexaaza cyclohexadeca-1,4,9,12-tetraene(fig.2). Macrocyclic complexes of the type, [MLCl2] [M=Co(II) , Ni(II), Cu(II) , Zn(II) or Cd(II)] have been prepared by reacting metal (II) chlorides with the ligand (L) in 1:1 molar ratio in ethanol. The prepared complexes were characterized by metal content analyses, IR , electronic spectroscopy, magnetic susceptibility and conductivity measurements. IR spectra confirm coordination of imine nitrogens to the central metal ion. An octahedral geometry has been suggested for all the complexes. The molar conductance values of the complexes show that they are non-electrolytes.

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