摘要

A novel organic-inorganic hybrid polyoxometalate-based 3D framework K5H4{Ce-3(H2O)(9)[As2W21O72(mal)(2)]}center dot 20H(2)O (1) (mat = malic acid) has been synthesized by the metastable precursor [As2W19O67(H2O)](14-), which was further characterized by IR spectrum, thermogravimetric analysis (TGA), and X-ray single-crystal diffraction. Structural analysis revealed that 1 consists of the organo-functionalized [As2W21O72(mal)(2)](18-) units linked together by the Ce3+ ions resulting in 3D network-like architecture. Magnetic property studies indicate that obvious antiferromagnetic interactions exist in three Ce3+ ions.