Solvent-dependent assembly of porous coordination polymers based on Keggin-type [SiW12O40]4-

Two coordination polymers (CPs) based on Keggin-type [SiW12O40](4-) (SiW12), [Zn-2(bpy)(2)(SiW12O40)(DMF)(8)]center dot solvent (1) and [Zn-2(bpy)(SiW12O40)(DMA)(8)]center dot 2DMA (2) (bpy = 4,4 '-bipyridine, DMF = N,N '-dimethylformamide; DMA = N,N '-dimethylacetamide), have been solvo-thermally synthesized and characterized by single crystal X-ray diffraction, powder X-ray diffraction, IR spectra, elemental analyses and thermogravimetric analyses. Both 1 and 2 are synthesized under similar conditions except DMF and DMA were used as the solvents for 1 and 2, respectively. Structural studies reveal that the supramolecular framework of 1 contains pumpkin-like voids, while 2 has a non-porous supramolecular framework. These results show that solvents play an important role in construction of the POM-based CPs. The luminescent properties for 1 and 2 have also been investigated. [GRAPHICS] .