Abstract
Three new supramolecular compounds based on Keggin-type polyoxometalate (POM) and transition metal complexes, [M(Hapca)2(H2O)2]2[SiW12O40]·nH2O, (M = NiII(1), ZnII(2), n = 12; CoII (3), n = 15; Hapca = 3-aminopyrazine-2-carboxylic acid), have been synthesized in aqueous solution and characterized by single-crystal X-ray diffraction, elemental analysis, TG analyses, IR and fluorescence spectroscopy. The X-ray structrual analysis reveals that three compounds are isostructural with a P21/c space group. [M(Hapca)2(H2O)2]24+ are linked together via O···N hydrogen-bonding interaction to give birth to 2D layer with rectangle grids. Anions [SiW12O40]4− are located in the cavities and link the 2D layers into 3D supramolecular architecture via hydrogen bonds. The compounds represent the first examples of self-assembly of 2D metal–Hapca complex supramolecular “host” networks formed by hydrogen bonding interactions and “guest” polyoxoanion species. In addition, solid-state luminescence properties of compounds 2 and 3 have been studied at room temperature.
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