Journal of Chemical Crystallography

, Volume 42, Issue 7, pp 656–667 | Cite as

Nickel(II) polypyridyl Complexes of 2,4,6-Tris(2-pyridyl)-1,3,5-triazine

  • Hassan Hadadzadeh
  • Mahbobeh Maghami
  • Jim Simpson
  • Aliakbar Dehno Khalaji
  • Khatereh Abdi
Original Paper

Abstract

The synthesis, purification, characterization, electrochemical properties, and fluorescence quenching of two new mononuclear Ni(II) complexes, [Ni(tptz)(CH3OH)Cl2] (1) and [Ni(tptz)2](PF6)2·CH3CN (2), containing the ligand 2,4,6-tris(2-pyridyl)-1,3,5-triazine (tptz) are described. Solid state structures of both complexes have been determined by single crystal X-ray crystallography. In (1) and (2), the Ni(II) metal centers use the major coordination site of the tptz ligand and the coordination geometry around the Ni(II) is a distorted octahedron. The free tptz ligand has three emission bands that are assigned to the 1(ππ*) and 1(nπ*) states. The fluorescence spectra of (1) and (2) show that the fluorescence quenching of the tptz fluorophore proceeds via an energy transfer process. Magnetic susceptibility data derived from paramagnetic NMR revealed effective magnetic moments of 2.75 μB for (1), and 2.91 μB for (2) at room temperature. Cyclic voltammetry of (1) shows that the Ni(III/II) reduction couple is quasi-reversible whereas in complex (2), the Ni(II/I) couple indicates an electrochemical (EC) mechanism.

Graphical Abstract

The synthesis, purification, characterization, electrochemical properties, and fluorescence quenching of two new mononuclear Ni(II) complexes, [Ni(tptz)(CH3OH)Cl2] and [Ni(tptz)2](PF6)2·CH3CN, containing the ligand 2,4,6-tris(2-pyridyl)-1,3,5-triazine (tptz) are described. Solid state structures of both complexes have been determined by single crystal X-ray crystallography.
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Keywords

2,4,6-Tris(2-pyridyl)-1,3,5-triazine (tptz) X-ray crystallography Nickel(II) complexes Cyclic voltammetry Fluorescence quenching Fluorophore 

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Hassan Hadadzadeh
    • 1
  • Mahbobeh Maghami
    • 1
  • Jim Simpson
    • 2
  • Aliakbar Dehno Khalaji
    • 3
  • Khatereh Abdi
    • 1
  1. 1.Department of ChemistryIsfahan University of TechnologyIsfahanIran
  2. 2.Department of ChemistryUniversity of OtagoDunedinNew Zealand
  3. 3.Department of Chemistry, Faculty of ScienceGolestan UniversityGorganIran

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