The Synthesis And Properties Of Metal Complexes Based Onα-Keggin-type Polyoxometalates

In this paper, one unreported hybrid compound have been synthesized by utilizingthe [H₂W₁₂O₄₀]^6-(W₁₂) clusters as building blocks，and transition metal ion andorganic ligand2-pyrazinecarboxylic acid as linker. Under hydrothermal synthesiscondition, we have synthesized one unreported hybrid compound, and structurallycharacterized by single crystal X-ray diffractions and elemental analyses, IR，TG. Thephotoluminescence properties of the compound1have been studied.By using the W₁₂ clusters as building blocks，with the transition metal silver ionsand organic ligand pyrazine-2,3-dicarboxylic as racation materials to synthesize a newcompound. Under the hydrothermal synthesis condition, pyrazine-2,3-dicarboxylicacid can be decomposed into2-pyrazinecarboxylic acid, the2-pyrazinecarboxylic acidas a organic ligand reactioned with the W₁₂ clusters and metal silver ions，a newcompound have been synthesized and characterized:[Ag₆（H₂O）₆（L）₄（W）(H₂W₁₂O₄₀)] H₂O（1）（L=2-pyrazinecarboxylate）In compound1，one W₁₂ clusters links sixteen silver ions, representing thehighest connection number of the W₁₂ clusters. There are three crystallographicallyunique silver cations, which have different coordination geometries, the ligand adoptsbidentate delate and single bridge coordination fashion to connect silver ions andtungsten ions，resulting2D lays,all the W₁₂ clusters are interlinked by silver ions，forming a3D arrangement through O-Ag-O bridging bonds.