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A polyoxometalate compound consisting of monovacant Keggin anions and trivalent lanthanide cations, K 2 H 2 {Ce(H 2 O) 6 [Ce(H 2 O) 2 (α-SiW 11 O 39 )]} 2 ·26H 2 O (1), has been synthesized and characterized by elemental analysis, IR and UV spectroscopy, TG analysis, and single crystal X-ray diffraction. Compound 1 crystallizes in the triclinic system with space group P1̄. The coordination of the monovacant Keggin anions and the Ce3+ ions creates a double-chain structure. The K +  cations link the double-chains to form corrugated layers, and the layers are further connected into a 3D architecture through hydrogen bonds. A variable temperature magnetic study indicates antiferromagnetic coupling in compound 1.

zeitschrift für naturforschung b

A One-dimensional Double-chain Compound Constructed from Ce III  Cations and [α-SiW 11 O 39 ] 8-  Anions: Synthesis, Crystal Structure and Magnetic Properties