Adsorption and Reactivity of Chiral Modifiers in Heterogeneous Catalysis: 1-(1-Naphthyl)ethylamine on Pt Surfaces

Adsorption and Reactivity of Chiral Modifiers in Heterogeneous Catalysis: 1-(1-Naphthyl)ethylamine on Pt Surfaces
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多相催化中手性修饰剂的吸附和反应活性:1-(1-萘基)乙胺在 Pt 表面上

DOI:
10.1021/acscatal.2c01627
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发表时间:
2022
期刊:
影响因子:
12.9
通讯作者:
Zaera, Francisco
Zaera, Francisco
中科院分区:
化学1区
文献类型:
--
作者:
Wang, Zihao;Fernández-Escamilla, Héctor Noé;Guerrero-Sánchez, Jonathan;Takeuchi, Noboru;Zaera, Francisco

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1-(1-萘基)乙胺(1-NEA),用于引入催化加氢反应中的对映选择性,以及其随后的化学反应性,从溶液上的吸附到Pt表面上,其特征在于由动力学催化测量,表面科学实验和量子力学计算的组合。用~ 1HNMR和气相色谱/质谱联用技术研究了1-NEA在负载型多相Pt催化剂的作用下与D_2发生H-D交换反应的机理,用原位红外吸收光谱研究了固液界面上N-D键形成的振动特征。量子力学计算有助于峰的归属,并提供证据支持H-D交换机制,涉及形成中间体吸附质子化的1-NEA物种。在Pt/SiO2和Pt/Al 2 O3催化剂上,用r-和s-1-NEA,r-和s-2-NEA,辛可宁,观察到该反应具有普遍性。NEA通过胺N原子的吸附和质子化解释了许多报道的但以前未完全理解的观察结果,并提供了一种设想NEA分子赋予Pt加氢催化剂对映选择性的机制的方法。
The adsorption from solution onto a Pt surface of 1-(1-naphthyl)ethylamine (1-NEA), a chiral modifier used to introduce enantioselectivity in catalytic hydrogenation reactions, as well as its subsequent chemical reactivity, was characterized by a combination of kinetic catalytic measurements, surface-science experiments, and quantum mechanics calculations. By using both1H NMR and gas chromatography/mass spectrometry detection, it was determined that 1-NEA can undergo H-D exchange with D2in solution when promoted by supported heterogeneous Pt catalysts.In situinfrared absorption spectroscopy studies at the solid–liquid interface afforded the detection of vibrational features indicative of the formation of N–D bonds, and quantum mechanics calculations helped with the peak assignment and provided evidence supporting an H-D exchange mechanism involving the formation of an intermediate-adsorbed protonated 1-NEA species. The reaction proved to be general, as it was observed with r- and s-1-NEA, r- and s-2-NEA, and cinchonine, and on Pt/SiO2and Pt/Al2O3catalysts. NEA adsorption and protonation through the amine N atom explain a number of reported but previously not fully understood observations and provide a way to envision the mechanism by which the NEA molecule bestows enantioselectivity to Pt hydrogenation catalysts.
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