Synthesis and properties of two new 3D organic-inorganic hybrid compounds constructed from Keggin clusters, pyridine-2,3-dicarboxylate and Ag(I) ions

摘要

Two new three-dimensional (3D) organic-inorganic hybrid compounds [K_2Ag_8(pydc)_2(Hpydc)_2 (H_2O)_4SiW_(12)O_(40)]?4H_2O (1) and (NH_4)_4(KAg_2(Hpydc) (H_2O)_(4.5)(H_2W_(12)O_(40))]?4H_2O (2) [H_2pydc = pyridine-2,3-dicarboxylate], were conventionally synthesized and characterized by IR, TG, elemental analysis, and single-crystal X-ray diffraction technique. In 1, six-nucleus [Ag_6(Hpydc)_2]~(4+) and two-nucleus [Ag_2(pydc)_2]~(2-) are linked alternately through oxygen atoms of the carboxylic group leading to a grid-like 2D layer. These layers are supported by SiW_(12) clusters, giving a unique 3D framework. In 2, each W_(12) cluster connects five Ag ions and three K ions, and each Ag1 or Ag2 ion links three W_(12) clusters, forming a double chain. Furthermore, these double chains are linked together through K~+ ions to form a 3D framework. The solid-state luminescence properties of compounds 1,2 and pyridine-2,3-dicarboxylate have been studied at room temperature.