Novel Polyoxometalate-Templated, 3-D Supramolecular Networks Based on Lanthanide Dimers: Synthesis, Structure, and Fluorescent Properties of [Ln2(DNBA)4(DMF)8][Mo
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- 作者：Xiuli Wang ; Yaqin Guo ; Yangguang Li ; Enbo Wang ; Changwen Hu ; and Ninghai Hu
- 刊名：Inorganic Chemistry
- 出版年：2003
- 出版时间：June 30, 2003
- 年：2003
- 卷：42
- 期：13
- 页码：4135 - 4140
- 全文大小：181K
- 年卷期：v.42,no.13(June 30, 2003)
- ISSN：1520-510X
文摘
The spherical Lindquist type polyoxometalate, Mo6O192-, has been used as a noncoordinating anionic template forthe construction of novel three-dimensional lanthanide-aromatic monocarboxylate dimer supramolecular networks[Ln2(DNBA)4(DMF)8][Mo6O19] (Ln = La 1, Ce 2, and Eu 3, DNBA = 3,5-dinitrobenzoate, DMF = dimethylformamide).The title compounds are characterized by elemental analyses, IR, and single-crystal X-ray diffractions. X-ray diffractionexperiments reveal that two Ln(III) ions are bridged by four 3,5-dinitrobenzoate anions as asymmetrically bridgingligands, leading to dimeric cores, [Ln2(DNBA)4(DMF)8]2+; [Ln2(DNBA)4(DMF)8]2+ groups are joined together by 
-stacking interactions between the aromatic groups to form a two-dimensional grid-like network; the 2-D supramolecularlayers are further extended into 3-D supramolecular networks with 1-D box-like channels by hydrogen-bondinginteractions, in which hexamolybdate polyanions reside. The compounds represent the first examples of 3-Dcarboxylate-bridged lanthanide dimer supramolecular "host" networks formed by - stacking and hydrogen-bonding interactions encapsulating noncoordinating "guest" polyoxoanion species. The fluorescent activity of compound3 is reported.
-stacking interactions between the aromatic groups to form a two-dimensional grid-like network; the 2-D supramolecularlayers are further extended into 3-D supramolecular networks with 1-D box-like channels by hydrogen-bondinginteractions, in which hexamolybdate polyanions reside. The compounds represent the first examples of 3-Dcarboxylate-bridged lanthanide dimer supramolecular "host" networks formed by - stacking and hydrogen-bonding interactions encapsulating noncoordinating "guest" polyoxoanion species. The fluorescent activity of compound3 is reported.