1D and 2D polyoxometalate-based composite compounds. Synthesis and crystal structure of [{Ba(DMSO)_5(H_2O)}_2(SiMo_12O_40)] and a [{Ba(DMSO)_3(H_2O)_3}{Ba(DMSO)_5(H_2O)}(GeMo_12O_40)]

摘要

The composites [{Ba(DMSO)_5(H_2O)}_2(SiMo_12O_40)] (1) and [{Ba(DMSO)_3(H_2O)_3}{Ba(DMSO)_5(H_2O)}(GeMo_12O_40)] (2) have been synthesized and characterized by IR and UV spectroscopy, and single-crystal X-ray structural analysis. Compound 1 forms an unprecedented one-dimensional linear chain built from alternating polyanions and cationic units in the crystal, whereas crystalline 2 contains a novel two-dimensional network made up of polyanions, metal ions, H_2O, and DMSO. The chain and net are both connected through Mo-O_t-Ba-O-Ba links.