Variable denticity of a multidentate terthiophene derivative towards Ni(II) and Zn(II) - structural studies

  • Hillete Hailu Department of Chemistry, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia
  • Berhane Atsebaha Gebru Department of Chemistry, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia
  • Shimelis Admassie Department of Chemistry, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia
  • Wendimagegn Mammo Department of Chemistry, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia
  • V.J.T. Raju Department of Chemistry, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia
  • Yonas Chebude Department of Chemistry, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia
Keywords: Variable denticity, 3, 4-bis(2-Iminomethylphenol)-2, 2’, 5, 2’’-terthiophene, Octahedral, Ni(II) complex, Zn(II) complex, Voltammetric studies

Abstract

A multidentate ligand, 3,4-bis(2-iminomethylphenol)-2,2’:5,2’’-terthiophene (L), has been synthesized by the condensation of 3,4-diamino-2,2’:5,2’’-terthiophene and salicylaldehyde. The ligand and Ni(II) and Zn(II) complexes were synthesized and characterized by IR, NMR, UV-Vis, AAS, MS, molar conductivity and magnetic susceptibility measurements. The ligand behaves as neutral ONS-ONS bis-chelant towards Ni(II) in [Ni<sub>2</sub>LCl<sub>4</sub>(H<sub>2</sub>O)<sub>2</sub>]×4H<sub>2</sub>O and as dibasic ONNO donor towards Zn(II) in [ZnL(NH<sub>3</sub>)<sub>2</sub>]. The dinuclear Ni(II) complex exhibits subnormal magnetic moment at room temperature due to metal-metal interaction through extended conjugation. The participation of the ring sulfur in bonding towards Ni(II) and the non-participation of the same towards Zn(II) are notable features. Octahedral geometries are proposed for both complexes. Cyclic voltammetric studies revealed electrochemical polymerization of the free ligand (L) but not of the Ni(II) and Zn(II) complexes.

 

KEY WORDS: Variable denticity, 3,4-bis(2-Iminomethylphenol)-2,2’:5,2’’-terthiophene, Octahedral, Ni(II) complex, Zn(II) complex, Voltammetric studies

 

Bull. Chem. Soc. Ethiop. 2011, 25(2), 221-231

Published
2016-11-06
Issue
Vol. 25 No. 2 (2011)
Section
Articles

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eISSN: 1726-801X
print ISSN: 1011-3924