首页> 外文期刊>RSC Advances >Construction of 2D interwoven and 3D metal-organic frameworks (MOFs) of Cd(II): the effect of ancillary ligands on the structure and the catalytic performance for the Knoevenagel reaction
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Construction of 2D interwoven and 3D metal-organic frameworks (MOFs) of Cd(II): the effect of ancillary ligands on the structure and the catalytic performance for the Knoevenagel reaction

机译:CD(II)的2D交织和3D金属有机框架(MOFS)的构建:辅助配体对knoevenagel反应的结构和催化性能的影响

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摘要

Three new Cd(II) metal-organic networks, [{Cd(muco)(bpa)(1.5)}center dot H2O] (1), [{Cd(muco)(bpee)(1.5)}center dot 7H(2)O] (2) and [Cd(muco)(4bpdh)center dot(H2O)] (3) (where, muco = trans, trans-muconate dianion, bpa = 1,2-bis(4-pyridyl) ethane, bpee = 1,2-bis(4-pyridyl) ethylene and 4bpdh = 2,5-bis(4-pyridyl)-3,4-diaza-2,4-hexadiene) have been constructed using mixed ligand systems at room temperature and characterized by single-crystal X-ray diffraction and other physicochemical methods. Compounds 1 and 2 are isostructural featuring a 3D framework structure with a 5-connected, {6(6)} net topology. Whereas, compound 3 possess an interesting 3-fold interwoven 2D network with a 4-connected, {4(4),6(2)}-sql net topology. Photoluminescence measurements revealed emissions from all the three compounds owing to ligand based charge transfer (pi -> pi* and pi -> pi*) transitions. Catalytic investigations of the compounds for the Knoevenagel reaction unveiled the higher catalytic activity of 3 compared to that of 1 and 2. The higher catalytic performance of 3 has been attributed due to the presence of the basic azine-functionalized pore surface. Remarkably, the catalyst can be facilely separated from the reaction mixture and could be reused without significant degradation in the catalytic activity for five cycles. Compound 3 is a rare example of a 3-fold interwoven 2D network acting as an efficient recyclable heterogeneous catalyst for the Knoevenagel reaction.
机译:三种新的CD(II)金属 - 有机网络,[{CD(MUCO)(BPA)(BPA)(1.5)}中心点H2O](1),[{CD(MUCO)(BPEE)(BPEE)(1.5)}中心点7H(2 )o](2)和[Cd(muco)(4bpdh)中心点(H2O)](3)(其中,Muco =反式,转粘液Dianion,BPA = 1,2-双(4-吡啶基)乙烷, BPEE = 1,2-双(4-吡啶基)乙烯和4BPDH = 2,5-双(4-吡啶基)-3,4-Diaza-2,4-十六二烯)在室温下使用混合配体系统构建了制造以单晶X射线衍射和其他物理化学方法为特征。化合物1和2是具有5连接,{6(6)}网拓扑的3D框架结构的表现形式。然而,化合物3拥有一个有趣的3倍交错的2D网络,具有4连接的{4(4),6(2)} - SQL网拓扑。光致发光测量显示由于基于配体的电荷转移(PI - > Pi *和Pi - > Pi *)过渡,所有三种化合物的排放揭示了所有三种化合物。与1和2相比,knoevenagel反应化合物的催化研究揭示了3的催化活性较高的催化活性。由于存在碱性吖嗪官能化孔表面,催化性能的较高催化性能归因于3。值得注意的是,催化剂可以从反应混合物中易于分离,并且可以在催化活性中没有显着降解的5个循环。化合物3是用作Knoevenagel反应的有效可回收的非均相催化剂的3倍交织的2D网络的罕见实施例。

著录项

  • 来源
    《RSC Advances》 |2016年第34期|共11页
  • 作者

    Ugale Bharat; Nagaraja C. M.;

  • 作者单位

    Indian Inst Technol Ropar Dept Chem Rupnagar 140001 Punjab India;

    Indian Inst Technol Ropar Dept Chem Rupnagar 140001 Punjab India;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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