A novel organic-inorganic hybrid polyoxometalate-based 3D framework constructed by organo-functionalized [As2W21O72(mal)2]18 − units and Ce3 + ions.

A novel organic-inorganic hybrid polyoxometalate-based 3D framework K 5 H 4 {Ce 3 (H 2 O) 9 [As 2 W 21 O 72 (mal) 2 ]}·20H 2 O (1) (mal = malic acid) has been synthesized by the metastable precursor [As 2 W 19 O 67 (H 2 O)] 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 [As 2 W 21 O 72 (mal) 2 ] 18 − units linked together by the Ce 3 + ions resulting in 3D network-like architecture. Magnetic property studies indicate that obvious antiferromagnetic interactions exist in three Ce 3 + ions. [ABSTRACT FROM AUTHOR]