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首页> 外文期刊>Chemistry: A European journal >A Recoverable Ruthenium Aqua Complex Supported on Silica Particles: An Efficient Epoxidation Catalyst
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A Recoverable Ruthenium Aqua Complex Supported on Silica Particles: An Efficient Epoxidation Catalyst

机译：支持二氧化硅颗粒的可回收钌水色复合物：一种有效的环氧化催化剂

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摘要

The preparation and characterization of complexes with a phosphonated terpyridine (trpy) ligand (trpy-P-Et) and a bidentate pyridylpyrazole (pypz-Me) ligand, with formula [RuII(trpy-P-Et)(pypz-Me)X]~(n+) (2: X=Cl, n=1; 3: X= H_2O, n=2), is described, together with the anchoring of 3 on two types of supports: mesoporous silica particles (SP) and silica-coated magnetic particles (MSP). Aqua complex 3 is easily obtained by heating 2 in refluxing water and exhibits a two-electron Ru~(IV/II) redox process. It was anchored on SP and MSP supports by two different synthetic strategies, yielding the heterogeneous systems SP@3 and MSP@3, which were fully characterized by IR and UV/Vis spectroscopy, SEM, cyclic voltammetry, and differential pulse voltammetry. Catalytic olefin epoxidation was tested with molecular complex 3 and its SP@3 and MSP@3 heterogeneous counterparts, including reuse of the heterogeneous systems. The MSP@3 material can be easily recovered by a magnet, which facilitates its reusability.
机译：用膦酸酯吡啶（Trpy-P-ET）和双乙酰吡啶基吡唑（Pypz-Me）配体的复合物的制备和表征，用式[ruii（Trpy-p-et）（pypz-me）x] 〜（n +）（2：x = cl，n = 1; 3：x = h_2o，n = 2），以及锚定3在两种类型的载体上：中孔二氧化硅颗粒（sp）和二氧化硅 - 涂覆磁性颗粒（MSP）。通过在回流水中加热2，通过加热2，氧化还原方法容易获得Aqua络合物3。它通过两种不同的合成策略锚定SP和MSP支持，产生异质系统SP @ 3和MSP @ 3，其通过IR和UV / VI光谱，SEM，循环伏安法和差示脉冲伏安法完全表征。用分子复合物3及其SP 3和MSP @非均相对应物测试催化烯烃环氧化，包括重复使用异质体系。 MSP @ 3材料可以通过磁铁容易地恢复，这有利于其可重用性。

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