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

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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(π–π *) and 1(n–π *) 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 μ B for (1), and 2.91 μ 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.

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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Acknowledgments

We are grateful to the Isfahan University of Technology (IUT) for financial support. We would also like to thank Dr. Mahbod Morshedi, Farid Hajareh Haghighi and Marzieh Daryanavard for their valuable help. We also thank the University of Otago for purchase of the diffractometer.

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Authors and Affiliations

  1. Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111, Iran

    Hassan Hadadzadeh, Mahbobeh Maghami & Khatereh Abdi

  2. Department of Chemistry, University of Otago, P.O. Box 56, Dunedin, 9054, New Zealand

    Jim Simpson

  3. Department of Chemistry, Faculty of Science, Golestan University, Gorgan, Iran

    Aliakbar Dehno Khalaji

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  1. Hassan Hadadzadeh
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  2. Mahbobeh Maghami
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Correspondence to Hassan Hadadzadeh.

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Hadadzadeh, H., Maghami, M., Simpson, J. et al. Nickel(II) polypyridyl Complexes of 2,4,6-Tris(2-pyridyl)-1,3,5-triazine. J Chem Crystallogr 42, 656–667 (2012). https://doi.org/10.1007/s10870-012-0296-7

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