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首页> 外文期刊>Inorganica Chimica Acta >Construction of heterometallic M2Pd3 supramolecular cages via a metalloligand strategy as heterogeneous catalyst for Suzuki-Miyaura coupling reaction
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Construction of heterometallic M2Pd3 supramolecular cages via a metalloligand strategy as heterogeneous catalyst for Suzuki-Miyaura coupling reaction

机译:通过金属溶血剂造型施工杂象M2PD3超分子笼作为铃木宫达偶联反应的异构催化剂

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摘要

On the basis of hard soft acid base theory, two neutral heterometallic M2Pd3 supramolecular cages, [Al2Pd3(L)(6)Cl-6] (1) and [Fe2Pd3(L)(6)Cl-6] (2) (where HL is 1-(4-(1H-imidazol-1-yl) phenyl)butane-1,3-dione), have been constructed by using the tripodal M(L)(3) as metalloligands in combination with PdCl2 or Pd(MeCN)(2)Cl-2. The supramolecular cage can be described as a trigonal bipyramid with two M3+ ions occupying at the two axial sites in Delta Delta or Lambda Lambda configurations and three Pd2+ ions sitting in the three equatorial positions with square planar geometry in trans configuration. The supramolecular cages exhibit high catalytic activity for the Suzuki-Miyaura coupling with arylbromide or arylchrolide and phenylboronic acid in biorenewable solvent glycerol under mild conditions. Moreover, the catalyst can be readily recycled and reused at least five times without loss of catalytic activity. The high catalytic performance may be attributed to the distinct properties of the cage structure with uniformly distributive and well-defined Pd active centres on the cage surfaces. The high stability in the cage structure also prevents Pd leaching out and agglomeration.
机译:在硬酸碱理论的基础上,两个中性差异金属M2PD3超分子笼,[Al2PD3(L)(6)Cl-6](1)和[Fe2PD3(L)(6)Cl-6](2)(其中HL是1-(4-(1H-咪唑-1-基)苯基)丁烷-1,3-二酮),通过使用三架M(L)(3)作为金属溶胶配合与PDCl2或Pd( Mecn)(2)Cl-2。超分子笼可以描述为Trigonal BiPyramid,其具有两个M3 +离子占据在Delta Delta或Lambda Lambda构造中的两个轴向位点,以及坐在三个赤道位置的三个赤道位置,方形平面几何形状中的反式配置。在温和条件下,超分子笼与芳族胺与芳基 - Miyaura与芳基溴化物或芳基硼酸盐和苯基硼酸偶联的高催化活性。此外,催化剂可以容易地再循环并重复使用至少五次而不会损失催化活性。高催化性能可以归因于笼式结构的不同性质,在笼表面上具有均匀分布和明确定义的PD活性中心。笼式结构中的高稳定性也防止了PD浸出并凝聚。

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