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Keywords:

  • Metal–organic frameworks;
  • ­Organic–inorganic hybrid composites;
  • ­Hybrid materials;
  • Polyoxometalates;
  • ­Polyoxomolybdophosphates;
  • Lanthan­ides;
  • Vanadium

Abstract

A series of hybrid compounds based on polyoxometalates (POM), namely, [Ln4(pdc)4(H2O)16][PMo11VO40]·2H2O (15) and [Ln4(pdc)4(H2O)16][HPMo10V2O40]·H2O (6, 7) (Ln = La, Ce, Pr, Nd, Sm for 15, respectively, and Ln = La and Ce for 6 and 7, respectively; H2pdc = pyridine-2,6-dicarboxylic acid), were hydrothermally synthesized and characterized by IR spectroscopy, elemental analyses, XRD, and single-crystal X-ray diffraction analyses. In these compounds, the Keggin polyanions [PMo12–xVxO40](3+x)– (x = 1, 2) are encapsulated as noncoordinating guests in the nonlinear channels of the 3D lanthanide–pdc-based host framework with a 43·62·8 topology. Moreover, photoluminescent properties, electrochemical properties, and catalytic properties were investigated.