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首页> 外文期刊>Advanced Functional Materials >Immobilization on a Nanomagnetic Co/C Surface Using ROM Polymerization: Generation of a Hybrid Material as Support for a Recyclable Palladium Catalyst
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Immobilization on a Nanomagnetic Co/C Surface Using ROM Polymerization: Generation of a Hybrid Material as Support for a Recyclable Palladium Catalyst

机译：使用ROM聚合固定在纳米磁性Co / C表面上：杂化材料的生成作为可回收钯催化剂的载体

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摘要

A novel hybrid material is reported as support for a recyclable palladium catalyst via surface immobilization of a ligand onto Co-based magnetic nanoparticles (NPs). A standard "click" reaction is utilized to covalently attach a norbornene tag (Nb-tag) to the surface of the carbon coated cobalt NPs. The hybrid magnetic nanoparticles are produced by initiating polymerization of a mixture containing both Nb-tagged ligand (Nb-tagged PPh_3) and Nb-tagged carbon coated cobalt NPs. In turn, the norbornene units are suitably functionalized to serve as ligands for metal catalysts. A composite material is thus obtained which furnishes a loading that is one order of magnitude higher than the value obtained previously for the synthesis of functionalized Co/C-nanopowders. This allows for its application as a hybrid support with high local catalyst concentrations, as demonstrated for the immobilization of a highly active and recyclable palladium complex for Suzuki-Miyaura cross-coupling reactions. Due to the explicit magnetic moment of the cobalt-NPs, the overall magnetization of this organic/inorganic framework is significantly higher than of polymer coated iron oxide nanoparticles with comparable metal content, hence, its rapid separation from the reaction mixture and recycling via an external magnetic field is not hampered by the functionalized polymer shell.
机译：据报道，一种新型的杂化材料可通过将配体表面固定在Co基磁性纳米颗粒（NPs）上，作为可回收钯催化剂的载体。利用标准的“喀哒”反应将降冰片烯标签（Nb-tag）共价连接到碳包覆钴纳米颗粒的表面。通过引发同时包含Nb标签的配体（Nb标签的PPh_3）和Nb标签的碳包覆的钴NPs的混合物的聚合反应来生产杂化磁性纳米颗粒。反过来，降冰片烯单元被适当地官能化以用作金属催化剂的配体。因此获得一种复合材料，其提供的载荷比先前合成功能化的Co / C-纳米粉所获得的值高一个数量级。这可以将其用作具有高局部催化剂浓度的杂化载体，如用于铃木-宫浦交叉偶联反应的高活性和可回收钯配合物的固定化所证明的。由于钴纳米颗粒的明显磁矩，这种有机/无机骨架的总体磁化强度明显高于具有可比金属含量的聚合物包覆的氧化铁纳米颗粒，因此，它可以从反应混合物中快速分离并通过外部循环利用磁场不受官能化聚合物壳的阻碍。

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  • 来源
    《Advanced Functional Materials》 |2010年第24期|p.4323-4328|共6页
  • 作者

    Alexander Schatz; Toby R. Long; Robert N. Grass; WendelinJ. Stark; Paul R. Hanson; Oliver Reiser;

  • 作者单位

    Institute for Organic Chemistry University of Regensburg Universitaetsstr. 31, D-93053 Regensburg, Germany;

    Department of Chemistry University of Kansas 1251 Wescoe Hall Drive, Lawrence, KS, 66045, USA and The University of Kansas Center for Chemical Methodologies and Library Development (KU-CMLD) 2121 Simons Drive, West Campus, Lawrence, KS, 66047, USA;

    Institute for Chemical and Bioengineering Department of Chemistry and Applied Biosciences ETH Zurich Wolfang-Pauli-Strasse 10 CH-8093 Zurich, Switzerland;

    Institute for Chemical and Bioengineering Department of Chemistry and Applied Biosciences ETH Zurich Wolfang-Pauli-Strasse 10 CH-8093 Zurich, Switzerland;

    Department of Chemistry University of Kansas 1251 Wescoe Hall Drive, Lawrence, KS, 66045, USA and The University of Kansas Center for Chemical Methodologies and Library Development (KU-CMLD) 2121 Simons Drive, West Campus, Lawrence, KS, 66047, USA;

    Institute for Organic Chemistry University of Regensburg Universitaetsstr. 31, D-93053 Regensburg, Germany;

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