低配位Cu-MOFs催化末端炔烃硼氢化反应的研究
Study on less-coordinated Cu-MOFs catalysis of terminal alkyne hydroboration
通过调控水热合成条件制备了Cu-TDCB和Cu-TDCH两种非均相催化剂应用于催化末端炔烃硼氢化反应。傅里叶变换红外光谱(FT-IR)、X射线衍射(XRD)和X射线光电子能谱(XPS)等表征结果证实,Cu-TDCs结晶度良好,Cu-TDCH二聚体具有较低的Cu—O配位数,且Cu(Ⅰ)/Cu(Ⅱ)含量明显高于Cu-TDCB。性能测试中,Cu-TDCH表现出更加优异的催化活性、广泛的底物普适性和循环稳定性。机理研究结果表明,反应遵循可能的质子氢转移路径,Cu(Ⅰ)/Cu(Ⅱ)结构协同促进硼氢化底物活化过程。为低配位Cu-MOFs材料的结构设计及其在炔烃硼氢化反应中的应用提供了新的思路。
The synthesis of two heterogeneous catalysts,Cu-TDCB and Cu-TDCH,was achieved by meticulously regulating the hydrothermal conditions to facilitate the catalysis of terminal alkyne hydroboration.The characterization results,incorporating Fourier-transform infrared spectroscopy (FT-IR),X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS),demonstrate that Cu-TDCs manifest notable crystallinity.Conversely,the Cu-TDCH dimer exhibits a diminished Cu-O coordination number and a conspicuously elevated Cu(Ⅰ)/Cu(Ⅱ) ratio in comparison to Cu-TDCB.The findings of the performance testing indicated that Cu-TDCH demonstrates superior catalytic activity,extensive substrate universality and exceptional cycling stability.Mechanistic studies indicate that the reaction follows a possible proton-hydrogen transfer pathway,with the Cu(Ⅰ)/Cu(Ⅱ) structure synergistically promoting substrate activation during borohydride reaction.It provides novel insights into the structural design of low-coordination Cu-MOFs and their application in alkyne borohydride reactions.
低配位模式 / 末端炔烃 / Cu-MOFs / (E)-乙烯基硼酸酯 / 高效硼氢化
low-coordination mode / terminal alkynes / Cu-MOFs / (E)-vinylboronates / efficient hydroboration
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国家自然科学基金(22162016)
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