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The intensity data of the title complex were collected at a low temperature of -90℃. Thecompound crystallizes in the monoclinic space group P2_1/n, a = 17.504(2), b = 27.323 (5),c = 21 .616(4)A, β= 104.49 (2)°, Z=4. The structure was solved by Patterson and Fouriertechniques and refined by least- squares to an R = 0.088 for 8320 independent reflections.The central Pr ion is bonded to eight oxygen atoms from two molybdosilicic heteropolyligands to form a square antiprism. The Pr- O average distance is 2.44 (2)A. Both molyb-dosilicic heteropoly ligands are of a defective α- Keggin structure.
The intensity data of the title complex were collected at a low temperature of -90 ° C. Thecompound crystallizes in the monoclinic space group P2_1 / n, a = 17.504 (2), b = 27.323 (5), c = 21.616 ) A, β = 104.49 (2) °, Z = 4. The structure was solved by Patterson and Fouriertechniques and refined by least- squares to an R = 0.088 for 8320 independent reflections. The central Prion is bonded to eight oxygen atoms from Two molybdosilicic heteropolyligands to form a square antiprism. The Pr-O average distance is 2.44 (2) A. Both molyb-dosilicic heteropolylic ligands are of a defective α- Keggin structure.