Self assembly of two novel three-dimensional supramolecular networks with blue photoluminescence |
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Authors: | Kou-Lin Zhang Na QiaoHong-Yan Gao Fang ZhouMing Zhang |
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Affiliation: | College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, PR China |
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Abstract: | Two novel photoluminescent coordination polymers of the formula [Cd(Haip)2(H2O)2] · 2H2O (1) and [Zn(aip)(atz)] · 3H2O (2) (H2aip = 5-aminoisophthalic acid; atz = 3-amino-1,2,4-triazole) have been synthesized through the self-assembly of metal(II) ions with H2aip and N-containing ligands [2-amino-5-mercapto-1,3,4-thiadiazole for 1 and 3-amino-1,2,4-triazole for 2, respectively] in the presence of NaOH. These complexes were characterized by FT-IR spectroscopy, thermogravimetric analysis (TG), elemental analysis and X-ray analysis. X-ray crystallographic studies of the complexes reveal that 1 is a first example where only one carboxylate group of the H2aip ligand participates in coordination with the metal(II) ion and it exhibits a two-dimensional framework which further assembles into a three-dimensional supramolecular network via interlayer π–π stacking interactions and strong hydrogen bonds, while 2 exhibits a two-dimensional porous architecture. The extensively strong hydrogen bonds and interlayer π–π stacking interactions in 2 lead to the formation of a three-dimensional supramolecular network. Photoluminescence properties of the compounds 1 and 2 have been examined in the solid state at room temperature. These compounds have been found to exhibit blue photoluminescence and may be good candidates for photoactive materials. |
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Keywords: | Self-assembly Cd(II) complex Zn(II) complex Crystal structures Supramolecular network Luminescence |
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