Assemblies based on the directing effect of non-classical W₁₈ anionic clusters and the rod-like trans-1,2-di-(4-pyridyl)-ethylen (bpe)

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• 作者：Zhangang Han^a ; ^{hanzg116@yahoo.com.cn} ; Yanna Wang^a ; Xuejun Song^b ; Jiao Huang^a ; Xueliang Zhai^a ;
• 关键词：Supramolecular assembly ; Polyoxometalate ; Conjugated system ; Hydrogen bond ; π ; -stacking
• 刊名：Journal of Solid State Chemistry
• 出版年：2011
• 出版时间：March 2011
• 年：2011
• 卷：184
• 期：3
• 页码：690-697
• 全文大小：1801 K

文摘

Two polyoxometalate (POM) supramolecular assemblies based on W₁₈ clusters and the rigid organic trans-1,2-di-(4-pyridyl)-ethylen (bpe) have been synthesized and fully characterized, namely (H₂bpe)3.5H₂[SbW₁₈O₆₀]·5H₂O (1), and (H₂bpe)5[Ni₄(AsW₉O₃₄)₂(H₂O)₂]·3H2O (2). Compounds 1–2 are formed from organic bpe cations and different polytungstate anions: pseudo-Dawson-type [SbW₁₈O₆₀]⁹⁻ in 1 and sandwich-type [Ni₄(H₂O)₂(AsW₉O₃₄)₂]¹⁰⁻ in 2. Both of compounds 1–2 crystallize in a low-symmetrical space group of P-1 and consist of a complicated supramolecular network based on non-covalent intermolecular weak interactions, including hydrogen bonding and π···π stacking. The multipoint hydrogen bonding interactions constitute the structural feature in two supramolecular frameworks. The UV–vis, fluorescence and electrochemistry properties are also studied.