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

Abstract

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.