The nickel, copper and zinc complexes of a potentially heptadentate nitrogen donor ligands

Abdullahi Mustapha, Graham Steel, John Reglinski, Alan Kennedy

Research output: Contribution to journalArticle

Abstract

The synthesis of the potentially heptadentate ligands, tris-(2-aminobenzylidene)amino-ethylamine (L3) and tris-(o-aminobenzyl)aminoethylamine (L4) are reported. Complexes of L3 with nickel copper and zinc have been synthesised and characterised. However, the nickel and zinc compounds are observed to re-arrange during the procedures used to produce samples for X-ray diffraction analysis. In both cases aniline groups are found to migrate to give rise to unique but related coordinated polyamine species. A rational route which allows for the reduction of the imine function in L3 is presented giving rise to a heptadetate ligand (L4) which contains primary, secondary and tertiary amines. Having removed the reactive imine function, the synthesized nickel and copper complexes follow the expected synthetic and structural pattern with the nickel complex being observed to be octahedral and the copper(II) complex five coordinate. The zinc complex is in contrast different. As observed for L3, it is possible to generate simple ZnL3 complexes but these are prone to intramolecular cyclisation where an aniline nitrogen couples with the secondary amine to form a coordinated indizine.
LanguageEnglish
Pages222-228
Number of pages7
JournalPolyhedron
Volume129
Early online date4 Apr 2017
DOIs
Publication statusPublished - 17 Jun 2017

Fingerprint

Nickel
Zinc
Copper
Imines
Nitrogen
zinc
Ligands
nickel
Aniline
aniline
nitrogen
copper
imines
ligands
Amines
amines
Zinc Compounds
Zinc compounds
Nickel compounds
zinc compounds

Keywords

  • multidentate nitrogen donor ligands
  • Schiff base
  • reduced Schiff base
  • polyamine
  • intramolecular migration
  • nickel
  • copper
  • zinc

Cite this

Mustapha, Abdullahi ; Steel, Graham ; Reglinski, John ; Kennedy, Alan. / The nickel, copper and zinc complexes of a potentially heptadentate nitrogen donor ligands. In: Polyhedron. 2017 ; Vol. 129. pp. 222-228.
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The nickel, copper and zinc complexes of a potentially heptadentate nitrogen donor ligands. / Mustapha, Abdullahi; Steel, Graham; Reglinski, John; Kennedy, Alan.

In: Polyhedron, Vol. 129, 17.06.2017, p. 222-228.

Research output: Contribution to journalArticle

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