Synthesis, crystal structures and blue fluorescent properties of two four-coordinate Zinc(II) complexes
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, = 95.926(12)°, Z = 4, R1 = 0.0659, wR2 = 0.1494; 2 crystallizes in the monoclinic space group P21/c, a = 9.589(6), b = 24.689(16), c = 18.386(12) Å, = 96.046(11)°, Z = 8, R1 = 0.0484, wR2 = 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.
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