Speedy one-pot electrochemical synthesis of giant octahedrons from in situ generated pyrrolidinyl PAMAM dendrimer.,Soft Matter

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Speedy one-pot electrochemical synthesis of giant octahedrons from in situ generated pyrrolidinyl PAMAM dendrimer.
Soft Matter ( IF 2.9 ) Pub Date : 2020-08-21 , DOI: 10.1039/d0sm00819b
Anup Singhania ₁ , Mrinal Dutta ₂ , Supriya Saha ₃ , Pathik Sahoo ₄ , Bharati Bora ₅ , Subrata Ghosh ₁ , Daisuke Fujita ₆ , Anirban Bandyopadhyay ₄

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A novel electrochemical synthesis via a radical generation pathway is described here for the generation of a quaternary megamer structure from secondary dendrimers. The reaction is rapid and completes in <5 min. We have used lower/higher generation poly(amido)amine (PAMAM) dendrimers with carboxylic acid groups at the terminals. A precise electrocatalytic reaction at >3.5 V activates the carboxylic groups to undergo anodic oxidation (−e⁻) and produce radical carboxylate anions on the dendrimer surface. The reaction further goes through a decarboxylative elimination. Successive self-assembly creates billions of polydispersed and extremely stable ∼500 nm octahedron nanostructures, which we failed to destroy even by using a 20 kV electron beam. This is a new route for the speedy synthesis of important futuristic materials of well-defined shape. It has applications in building designer organic crystals for solar cells, organic electronics, rapid protein gelation, rapid protein crystallization, etc.

中文翻译：

从原位生成的吡咯烷基 PAMAM 树枝状聚合物中快速电化学合成巨型八面体。

本文描述了一种通过自由基生成途径的新型电化学合成，用于从二级树枝状聚合物生成四元巨聚物结构。该反应快速，并在<5 id=128>3.5 V 内完成，激活羧基进行阳极氧化 (−e ⁻ ) 并在树枝状聚合物表面产生自由基羧酸根阴离子。该反应进一步进行脱羧消除。连续的自组装产生了数十亿个多分散且极其稳定的〜500 nm八面体纳米结构，即使使用20 kV电子束我们也无法破坏它。这是快速合成形状明确的重要未来材料的新途径。它可应用于构建用于太阳能电池、有机电子、快速蛋白质凝胶、快速蛋白质结晶等的设计师有机晶体。

更新日期：2020-10-15

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