Coordination studies of 5,6-diphenyl-3-(2-pyridyl)-1,2,4-triazine towards Zn2+ cation. Synthesis and characterization by X-ray diffraction and spectroscopic methods

Abstract

Abstract The two Zn(II) complexes Zn(dppt)Cl2·0.5 H2O (1) and Zn(dppt)2Cl2·2 H2O (2) were obtained by reaction of 5,6-diphenyl-3-(2-pyridyl)-1,2,4-triazine (dppt) with zinc chloride. Complex (2) could be obtained from (1) by addition of an excess of dppt. These complexes have been characterized by 1D and 2D 1H NMR spectroscopy, mass spectrometry, and in the solid state by IR and X-ray diffraction. In (1), the Zinc atom is bound to one ligand through the N atom of the pyridyl ring and one of the N atoms of the triazine ring, and to two chlorine atoms in a distorted tetrahedral coordination geometry. Instability of crystals of compound (2) (namely, the lost of crystallization solvent molecules) did not allow their analysis by X-ray diffraction. Structure and stoichiometry of (2) were determined by 2D COSY 1H NMR and mass spectrometry. Two magnetically equivalent ligands (dppt) are coordinated to the metal center. To cite this article: V. Bereau et al., C.R. Chimie 8 (2005).