Journal
INORGANICA CHIMICA ACTA
Volume 361, Issue 7, Pages 2013-2018Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2007.10.015
Keywords
polyoxometalates; Anderson-type polyanions; (H2O)(8) clusters; hydrogen bonds; fluorescence
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Two compounds, [Eu(H2O)(7)][Al(OH)(6)Mo6O18]center dot 4H(2)O (1) and {(C2H5NO2)(2)[Eu(H2O)(5)]}[Al(OH)(6)Mo6O18]center dot 10H(2)O (2), have been synthesized by conventional solution method and determined by single-crystal X-ray diffraction. Compound 1 shows a 1D chain structure built up of alternating Anderson-type polyanions [Al(OH)(6)Mo6O18](3-) and hydrated rare-earth ions Eu3+. Compound 2 displays a 3D supramolecular network structure containing 1D sandglass-like channels along c axis, which were occupied by repetitive array of (H2O)(8) clusters. Extensive hydrogen bonds play an important role in the formation of the 3D structures of 1 and 2. Luminescence measurements reveal that 1 and 2 exhibit intense red and orange fluorescent emission at room temperature, respectively. Origin of the distinct emission can be assigned to the different site symmetries of Eu3+ centers in the two compounds. These results are consistent with the crystal structures of the two compounds. (C) 2007 Elsevier B.V. All rights reserved.
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