A new organic-inorganic hybrid tetrameric polyoxometalate assembled by monovacant Dawson [α2-P2W17O61]10- and trivalent cerium cations

A novel octa-nuclear cerium(III)-containing organic-inorganic hybrid polyoxometalate [N(CH3)(4)](8) H-16 [Ce((eta(1)-C6H5NO2)(2)H2O)(6)[Ce(H2O)(3)(alpha(2)-P2W17O61)]} {Ce (eta(2)-C6H5NO2)(2) (H2O)(5) [Ce(H2O) (alpha(2)-P2W17O61)]}](2)center dot 9OH(2)O (C6H5NO2 = isonicotinic acid) (1) was obtained, which had been hydrothermally synthesized and characterized by IR spectrum, thermogravimetric analysis (TGA), and X-ray single-crystal diffraction. Structural analysis indicated at I is composed of four lacunary Dawson-type units [alpha(2)-P2W17O61](10-) joined together by eight cerium cations forming an uncommon zigzag tetrameric structure with eight isonicotinic acids as the organic pendants coordinating to the cerium cations. Magnetic property studies indicate that obvious antiferromagnetic interactions exist in eight Ce3+ cations. (C) 2016 Elsevier B.V. All rights reserved.