Two new polyoxometalate-based metal-organic complexes constructed from two in-situ transformed ligands through different ways

Two new Keggin-type polyoxometalates-based metal–organic complexes: [Ag3(L1)3(PMo12O40)]·3H2O (1) and Ag4(L2)2(HL2)(PW12O40)Na2(μ-OH)]·1.5H2O (2) (L1 = 1.2.4-triazole, HL2 = 4-amino-1,2,4-triazole) have been hydrothermally synthesized and structurally characterized by single crystal X-ray diffraction analyses, IR spectra and powder X-ray diffraction analyses. In compound 1, the [Ag6(L1)6] crown-shaped ring was clamped by two [PMo12O40]3 − polyanions, forming a sandwich-like [Ag6(L1)6(PMo12O40)2] unit, which was extended to a 1D supramolecular chain through hydrogen bonding interaction. Compound 2 is a 3D metal–organic framework containing the [Ag6(L2)4(HL2)2] crown-shaped ring and 1D [Na2(PW12O40)(μ-OH)]n inorganic chains, which represents a novel (3,3,4,6,10-c)-connected 3D topological framework. The L1 and L2 ligands were in-situ transformed from two different N-heterocyclic amide ligands through different ways, respectively. In addition, the electrocatalytic and photocatalytic activities of the title compounds have been studied.

Two polyoxometalate-based metal-organic complexes with different structures have been hydrothermally synthesized by using two in-situ transformed triazole-based ligands through different ways. In 1, the formation of L1 is due to NN bond cleavage of amino triazole instead of the amide bond, which has never been observed in metal-organic complexes. Compound 2 shows an unprecedented (3,3,4,6,10-c)-connected 3D topology framework.Figure optionsDownload as PowerPoint slide