Ionothermal synthesis, structures, properties of cobalt-1,4-benzenedicarboxylate metal-organic frameworks

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• 作者：Zong-Hui Zhang^a ; ^b ; Ling Xu^a ; ^{xuling@snnu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Huan Jiao^a ; ^{jiaohuan@snnu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：1 ; 4-Benzenedicarboxylic acid ; Metal-organic framework ; Crystal structure ; Ionothermal synthesis
• 刊名：Journal of Solid State Chemistry
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：238
• 期：Complete
• 页码：217-222
• 全文大小：1543 K

文摘

Eight kinds of 1-methyl-3-alkylimidazolium halide [RMI]X (R=ethyl (E), propyl (P), butyl (B) and amyl (A); MI = imidazolium; X= Cl⁻, I⁻) ionic liquids (ILs) were used as reaction media and obtained a series of 2D [RMI]₂[Co₃(BDC)₃X₂] frameworks through the ionothermal reactions of 1,4-benzenedicarboxylic acid (H₂BDC) with Co(NO₃)₂·6H₂O. The 2D [RMI]₂[Co₃(BDC)₃X₂] frameworks exhibit a same (3,6) topology network with [RMI]⁺ cations locating in the interlayer space. [RMI]⁺ cations play a template role in the structure constructions, whose influence combining with the effect of X⁻ anions pass to the TG behaviors. The decomposition temperatures of the [RMI]₂[Co₃(BDC)₃X₂] frameworks decrease with the alkyl chains in [RMI]⁺ cations, and the compounds containing Cl⁻ show higher thermal stabilities than those with I⁻. However, compounds 1–8 exhibit two similar broad emissions at ca. 380 and 390 nm, assigned to ILCT. The RMI⁺ templates and the X⁻ anions do not exert their influence on the fluorescence.