Synthesis, crystal structures and blue fluorescent properties of two four-coordinate Zinc(II) complexes

Abstract

Two novel complexes, [Zn(deatrz)₄](ClO₄)₂·H₂O (1) and [Zn(deatrz)₂(SCN)₂] (2), have been prepared and characterized by X-ray crystallography, absorption and luminescence spectroscopy (deatrz = 3,5-diethyl-4-amino-1,2,4-triazole). Complex 1 crystallizes in the monoclinic space group P2₁/c, a = 13.287(8), b = 23.212(14), c = 12.562(8) Å, β = 95.926(12)°, Z = 4, R ₁ = 0.0659, wR ₂ = 0.1494; 2 crystallizes in the monoclinic space group P2₁/c, a = 9.589(6), b = 24.689(16), c = 18.386(12) Å, β = 96.046(11)°, Z = 8, R ₁ = 0.0484, wR ₂ = 0.1064. Complex 1 is the first example of zinc(II) coordinated to four triazole ligands in a tetrahedral environment in 3,4,5-alkyl-substituted 1,2,4-triazole complexes. The coordination sphere of the zinc(II) ion in 2 is a distorted tetrahedron completed by two independent nitrogen atoms of two triazole ligands and two thiocyanate ions. Complex 1 displays stronger blue photoluminescence than 2 as the result of extra triazole ligands coordinated to the zinc(II) ion.

Keywords:

• Zinc(II) complexes
• Triazole
• Crystal structure
• Fluorescence properties

Acknowledgements

This work was supported by the National Science Foundation of China (Nos. 90101028 and 50173011) and the TRAPOYT of MOE China.

Supplementary Data

Full lists of crystallographic data are available from the authors.