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首页> 外文期刊>RSC Advances >A simple, recyclable, and self-assembled palladium(ii)–alkyl Schiff base complex for Suzuki coupling reaction: chain length dependence and heterogeneous catalysis
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A simple, recyclable, and self-assembled palladium(ii)–alkyl Schiff base complex for Suzuki coupling reaction: chain length dependence and heterogeneous catalysis

机译：用于铃木偶联反应的简单，可回收和自组装的钯（II） - 烷基席夫碱基络合物：链长依赖性和异质催化

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摘要

A series of self-assembled Pd( II )–alkyl Schiff base complexes [PdL _( n ) –Si] (Cat. 1–5 ) [ n = 0, 1, 3, 6, 10] having different chain lengths were synthesized and characterized by water drop contact angle (WDCA), atomic force microscopy (AFM), ultraviolet-visible spectroscopy (UV-Vis), Raman spectroscopy (RS), and X-ray photoelectron spectroscopy (XPS) analyses. Catalyst 3 with a moderate alkyl chain exhibited highly active and recyclable properties for the Suzuki coupling reaction, which indicated that the length of the alkyl chain significantly affects the catalytic activity due to a suitable orientation and electron-rich environment which make it easy to form palladium–ligand bonds, stabilize the active species and facilitate the insertion of this metal into the Ar–X bond. The catalytic mechanism was also investigated, in which a three-phase test indicated that the self-assembled complexes act as true heterogeneous catalysts. The catalytic process was analyzed by RS and XPS, indicating it is a surface catalysis process.
机译：合成了一系列自组装的Pd（II）-烷基Schiff碱基复合物[PDL _（n）-si]（猫。1-5）[n = 0,1,3,6,10]是合成的，具有不同的链长度并以水滴接触角（WDCA），原子力显微镜（AFM），紫外 - 可见光谱（UV-VI），拉曼光谱（RS）和X射线光电子能谱（XPS）分析。具有中等烷基链的催化剂3表现出用于铃木偶联反应的高活性和可回收性质，表明烷基链的长度由于合适的取向和电子富含电子环境而显着影响催化活性，这使得易于形成钯 - 粘合剂，稳定活性物质并促进将该金属插入Ar-X键。还研究了催化机理，其中三相试验表明自组装复合物充当真正的异构催化剂。通过RS和XPS分析催化过程，表明它是表面催化过程。

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