Cu-MOF及Co/Cu-MOF催化炔烃硼氢化反应的研究
Study on hydroboration of alkynes over Cu-MOF and Co/Cu-MOF catalysts
开发了新型Cu-MOF催化剂[Cu(bpy)(H2O)2(BF4)2(bpy)],并将其作为非均相催化剂用于炔烃硼氢化反应。通过SEM、TGA和FT-IR表征,证实其具有Cu(Ⅱ)金属节点及光滑片状结构的金属框架,但催化测试显示其对供电子基团底物活性有限,且循环3次后活性显著下降。自由基猝灭实验揭示了反应中可能生成N-B中间体的催化机制。为突破这些局限性,引入Co构建Co/Cu-MOF-40双金属催化剂,结构表征表明Co掺杂形成类甘蔗棒状形貌,有效调控了Cu位点电子分布。催化实验表明,Co/Cu-MOF-40的底物适用性显著拓宽,对含供电子基团底物表现出优异活性,且循环使用5次后苯乙烯基硼酸酯收率仍保持90%以上。该研究不仅为炔烃硼氢化反应提供了一种高效、可重复利用的催化剂,也为双金属MOFs的设计与性能调控提供了新思路,助力绿色催化技术的发展。
In this study,a novel Cu-MOF catalyst,[Cu(bpy)(H2O)2(BF4)2(bpy)],is successfully developed via a solvothermal method,and employed as a heterogeneous catalyst for alkyne hydroboration.It is confirmed through characterization techniques including scanning electron microscopy (SEM),thermogravimetric analysis (TGA),and Fourier-transform infrared spectroscopy (FT-IR) that the Cu-MOF catalyst features Cu(Ⅱ) as metal nodes,forming a smooth lamellar structure with a stable crystalline framework.Catalytic performance tests reveal a limited efficiency of Cu-MOF toward substrates bearing electron-donating groups,along with a significant decline in activity after three reuse cycles.Radical quenching experiments further suggest the potential formation of an N-B intermediate species during the reaction,which may contribute to catalytic activity.To address these issues,a bimetallic synergistic strategy is proposed by incorporating Co into the Cu-MOF framework,yielding a Co/Cu-MOF-40 composite catalyst.Structural characterization demonstrates that the bimetallic material exhibits a unique sugarcane-like rod-shaped morphology,with Co doping effectively modulating the electronic distribution of Cu sites.Catalytic tests indicate that Co/Cu-MOF-40 broadens substrate compatibility significantly,exhibiting an enhanced activity toward electron-donating group-containing substrates that are poorly catalyzed by the pristine Cu-MOF.Moreover,the cycling stability of the catalyst is markedly improved,maintaining a styrenyl boronate yield above 90% even after five consecutive reuse cycles.This study provides an efficient and recyclable catalyst for alkyne hydroboration,and also offers new insights into the design and performance optimization of bimetallic MOFs,contributing to the advancement of green catalytic technologies.
Cu-MOF / 金属基催化剂 / 烯基硼酸酯 / 硼氢化 / 双金属MOFs
Cu-MOF / metal-based catalyst / alkenyl boronate / hydroboration / bimetallic MOFs
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国家自然科学基金(22068023)
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