Journal
JOURNAL OF CHEMICAL CRYSTALLOGRAPHY
Volume 42, Issue 7, Pages 656-667Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10870-012-0296-7
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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Funding
- Isfahan University of Technology (IUT)
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The synthesis, purification, characterization, electrochemical properties, and fluorescence quenching of two new mononuclear Ni(II) complexes, [Ni(tptz)(CH3OH)Cl-2] (1) and [Ni(tptz)(2)](PF6)(2)center dot 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)(pi-pi (*) ) and (1)(n-pi (*) ) 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 mu (B) for (1), and 2.91 mu (B) 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. The synthesis, purification, characterization, electrochemical properties, and fluorescence quenching of two new mononuclear Ni(II) complexes, [Ni(tptz)(CH3OH)Cl-2] and [Ni(tptz)(2)](PF6)(2)center dot 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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