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

Abstract

Two coordination polymers (CPs) based on Keggin-type [SiW₁₂O₄₀]^4– (SiW₁₂), [Zn₂(bpy)₂(SiW₁₂O₄₀)(DMF)₈]·solvent (1) and [Zn₂(bpy)(SiW₁₂O₄₀)(DMA)₈]·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.

Graphical Abstract

Keywords:

• Porous coordination polymers
• [SiW12O40]4^–
• zinc(II) compounds
• solvothermal reaction
• luminescent property

Additional information

Funding

This work was supported by the NSFC (21301048 and 21401062); the Natural Science Fund of Jiangsu Province (BK20171263, BK20140447, and BK20141247); and the University Science Research Project of Jiangsu Province (13KJB430005, 15KJB430004, and 16KJB150004).