Speedy one-pot electrochemical synthesis of giant octahedrons from in situ generated pyrrolidinyl PAMAM dendrimer. Issue 39 (14th September 2020)

• Record Type: Journal Article
• Authors: Singhania, Anup; Dutta, Mrinal; Saha, Supriya; Sahoo, Pathik; Bora, Bharati; Ghosh, Subrata; Fujita, Daisuke; Bandyopadhyay, Anirban
• Is Part Of: Soft matter. Volume 16:Issue 39(2020)
• Page Start: 9140
• Page End: 9146
• Publication Date: 2020-09-14
• Subjects: Soft condensed matter -- Periodicals; 530.413
• DOI: 10.1039/d0sm00819b
• Languages: English
• ISSNs: 1744-683X

Abstract

Abstract : A novel electrochemical synthesis via a radical generation pathway is described here for the generation of a quaternary megamer structure from secondary dendrimers. Abstract : 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.