Synthesis and characterization of some new polyoxometalates

In this study, polyoxometalate (POM) structures containing ligands of ethylenediamine (en), diethylenetriamine (dta), triethylamine (trea) were synthesized. The structure of the complexes was characterized by X-ray single crystal method, FT-IR and thermal analysis (TG/DTA/DTG) techniques. The closed formulas of the complex structures can be represented by the formulas {Na2[Na4(dta)2(PW12O40)2]·2(H2O)}n (1), [Na3(H2O)4PW12O40] (2), [(Htrea)5(BW12O40)]·2H2O (3), [Na3(en)3]2[Na0.5H1.5BW12O40] (4) were determined by X-ray single crystal method. Compounds 1, 2 and 4 were synthesis by hydrotermal method and compound 3 was synthesis at the room conditions. In the crystal structure analysis, supramolecular Keggin-type POM clusters containing [PW12O40]3- for compound 1 and 4, and [BW12O40]5- heteropolyions for compounds 2 and 3 were observed.