A new family of polyoxometalate compounds built up of Preyssler anions and trivalent lanthanide cations

摘要

Four new polyoxometalate compounds built on Preyssler anions and trivalent lanthanide cations, Na-2[{Ce(H2O)(8))(4){Na(H2O)P5W30O110}] center dot 12H(2)O (1), H4Na4[Nd-2(H2O)(14){Na(H2O)P5W30O110}] center dot 22H(2)O (2), K2Na[Eu-3(H2O)(14)(HNA)(3){Eu(H2O)P5W30O110}] center dot 3H(2)O (3 NA = nicotinic acid) and H-2[Ce-4(H2O)(16)(HNA)(6){Na(H2O)P5W30O110}] center dot 12H(2)O (4) have been synthesized and characterized by elemental analysis, IR, TG and single crystal X-ray diffraction. Compound 1 exhibits a tetrasupporting polyoxometalate cluster structure where four {Ce(H2O)(8)}(3+) fragments are supported on the [Na(H2O)P5W30O110](4-) cluster. Compound 2 shows a one-dimensional chain structure built from [Na(H2O)P5W30O110](14-) clusters linked by Nd3+ cations. Compound 3 displays a one-dimensional chain structure constructed of [Eu(H2O)P5W30O110](12-) clusters bridged by Eu3+ cations. Compound 4 has a 2D network formed by (Ce-2(H2O)(10){Na(H2O)P5W30O110}](n)(8n-)1D chains and {Ce-2(H2O)(6)(HNA)(6)}(6+) linkers. Compounds 2-4 represent the first extended structures based on Preyssler anions. In addition, the fluorescent activity of compound 3 is reported. (c) 2006 Elsevier B.V. All rights reserved.