Palladium nanoparticles encapsulated in polyimide nanofibers: An efficient and recyclable catalyst for coupling reaction,Applied Organometallic Chemistry

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Palladium nanoparticles encapsulated in polyimide nanofibers: An efficient and recyclable catalyst for coupling reaction
Applied Organometallic Chemistry ( IF 3.7 ) Pub Date : 2021-09-13 , DOI: 10.1002/aoc.6445
Yijun Du ₁ , Faliang Gou ₁ , Danning Gao ₁ , Zhifeng Liu ₁ , Linjun Shao ₁ , Chenze Qi ₁

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In this study, palladium-encapsulated poly(amic acid) (Pd@PAA) nanofibers were prepared by electrospinning, followed by thermal imidization to synthesize palladium-encapsulated polyimide (Pd@PI) nanofibers. Scanning electron microscopy (SEM) images confirmed the preparation of uniform and smooth Pd@PAA and Pd@PI nanofibers. Thermogravimetric analysis (TGA) results reveal that the Pd@PI nanofibers possessed excellent thermal stability. The dispersion of palladium nanoparticles in the polyimide nanofibers was characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The catalysis results show that this Pd@PI fibrous catalyst was very efficient to catalyze the cross-coupling reactions of aromatic iodides with n-butyl acrylate (Heck reaction) or phenylboronic acid derivatives (Suzuki reaction) to afford the desired products in good to excellent yields. Moreover, the Pd@PI catalyst could be easily separated and recovered from the reaction mixture by simple filtration due to the regular fibrous structure and reused for 10 times for both Heck and Suzuki reactions without obvious loss of its initial catalytic activity. Thus, the Pd@PI nanofiber catalyst holds great potential in chemical industry in terms of its excellent catalytic activity and stability.

中文翻译：

包裹在聚酰亚胺纳米纤维中的钯纳米颗粒：一种高效且可回收的偶联反应催化剂

在这项研究中，通过静电纺丝制备钯包封的聚（酰胺酸）（Pd@PAA）纳米纤维，然后通过热酰亚胺化合成钯包封的聚酰亚胺（Pd@PI）纳米纤维。扫描电子显微镜 (SEM) 图像证实了均匀且光滑的 Pd@PAA 和 Pd@PI 纳米纤维的制备。热重分析 (TGA) 结果表明 Pd@PI 纳米纤维具有优异的热稳定性。钯纳米粒子在聚酰亚胺纳米纤维中的分散性通过透射电子显微镜 (TEM) 和 X 射线衍射 (XRD) 进行表征。催化结果表明，该 Pd@PI 纤维催化剂对催化芳香碘化物与n的交叉偶联反应非常有效。- 丙烯酸丁酯（Heck 反应）或苯基硼酸衍生物（Suzuki 反应）以良好至极好的收率提供所需的产物。此外，由于具有规则的纤维结构，Pd@PI 催化剂可以通过简单的过滤从反应混合物中轻松分离和回收，并且可以在 Heck 和 Suzuki 反应中重复使用 10 次，而其初始催化活性没有明显损失。因此，Pd@PI纳米纤维催化剂以其优异的催化活性和稳定性在化学工业中具有巨大的潜力。

更新日期：2021-09-13

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