The first two-dimensional organic-inorganic hybrid constructed by oxalate-bridging scandium-substituted Keggin-type silicotungstate and [Cu(en)₂]^2 + coordination cations

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• 作者：Dongdi Zhang^a ; ^b ; Shaowei Zhang^b ; Pengtao Ma^b ; Jingping Wang^b ; ^{jpwang@henu.edu.cn} ; Jingyang Niu^b ; ^{jyniu@henu.edu.cn}
• 关键词：Keggin-type ; Polyoxometalate ; Silicotungstate ; RE&ndash ; TM heterometals ; Oxalate
• 刊名：Inorganic Chemistry Communications
• 出版年：2012
• 期刊代码：39_13877003
• 类别：ch
• 出版时间：June, 2012
• 卷：20
• 期：Complete
• 页码：191-195
• 文件大小：1063 K

摘要

The hydrothermal reactions of Keggin-type silicotungstate with rare-earth-transition-metal (RE-TM) heterometals in the presence of mixed ligands of oxalate and en (en = ethylenediamine) generate a novel two-dimensional (2D) organic-inorganic hybrid oxalate-bridging scandium-substituted silicotungstate. The complex [Cu(en)₂(H₂O)]₂{[Cu(en)₂(H₂O)]₂[Cu(en)₂]₂[(伪-SiW₁₁O₃₉)Sc(H₂O)]₂(C₂O₄)}路8H₂O (1) has been further characterized by elemental analyses, powder X-ray diffraction (PXRD), IR spectra, thermogravimetric (TG) analyses, and single-crystal X-ray diffraction. X-ray structural analysis reveals that 1 exhibits the dimeric mono-Sc substituted Keggin [Sc(伪-SiW₁₁O₃₉)]₂^{10 鈭?/sup> subunits linked by the oxalate ligand, which further results in the 2D network architecture interconnected by [Cu(en)₂]2 + coordination cations. Notably, 1 represents the first oxalate-bridging RE-TM heterometallic hybrid built by lacunary Keggin silicotungstate-supported RE derivatives and [Cu(en)₂]2 + coordination cations. Furthermore, the TG curve of 1 displays two steps of slow weight loss in the range of 25-1000 掳C.}