Juin 2019. Nouvelle publication de Narcis Avarvari dans le journal Elsevier


  Dipicolylamino-methoxy-1,2,4,5-tetrazine ligand and its metal complexes:
  Structural and photophysical studies

  Oleh Stetsiuk, Abdelkrim El-Ghayoury, Andreas Hauser, Narcis Avarvari.


The ligand 6-methoxy-N,N-bis(pyridin-2-ylmethyl)-1,2,4,5-tetrazin-3-amine has been prepared by nucleophilic substitution from 3-chloro-6-dipicolylamino-1,2,4,5-tetrazine. The ligand L, together with two neutral zinc(II) and cadmium(II) metal complexes,  respectively formulated as [ZnLCl2] and [CdLCl2]2 , have been crystallized and  analyzed by single crystal X-ray diffraction analysis. The two metal complexes are isostructural and crystallize in the monoclinic system, space group P21/c.
The structure analysis indicates that the amino nitrogen atom is involved in semi-coordination with the metal centers, thus leading to distorted coordination geometries. Photophysical studies of the ligand and its corresponding metal complexes 2 and 3 show a switch-on of the luminescence upon chelation with the diamagnetic Zn(II) and Cd(II) metal ions.

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