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Abstract
Two new banana-shaped tungstophosphates [M6(H2O)2(PW9O34)2(PW6O26)]17 − (MII = NiII, CoII) incorporating two types of lacunary polyoxometalate units have been synthesized in aqueous solution and characterized by elemental analyses, IR, and UV spectra, and single-crystal X-ray diffraction. Structural analyses show that Na6H11[Ni6(H2O)2(PW9O34)2(PW6O26)] · 32H2O (1) and Na7H10[Co6(H2O)2(PW9O34)2(PW6O26)] · 31H2O (2) are generated from two tri-MII substituted B-α-[(MOH2)M2PW9O34] Keggin units connected by a hexavacant [PW6O26]11− Keggin fragment, leading to the MII-containing banana-shaped tungstophosphates. Magnetic properties of 2 show decrease of the molar magnetic susceptibility at higher temperatures results from spin-orbit coupling of CoII and antiferromagnetic interactions whereas the maximum at the lower temperatures is indicative of the ferromagnetic interactions within the trinuclear CoII spin cluster in the sandwich belt.
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Acknowledgments
This work was supported by the Natural Science Foundation of China, Special Research Fund for the Doctoral Program of Higher Education, Innovation Scientists and Technicians Troop Construction Projects of Henan Province, the National Science Fund for Young Scholars of China (Grant no. 21101059) and the Open Research Fund of State Key Laboratory of Inorganic Synthesis and Preparative Chemistry (Grant no. 2011-26).
