Synthesis and Catalytic Applications of Multi‐Walled Carbon Nanotube–Polyamidoamine Dendrimer Hybrids. Issue 49 (26th July 2018)

• Record Type: Journal Article
• Authors: Desmecht, Antonin; Steenhaut, Timothy; Pennetreau, Florence; Hermans, Sophie; Riant, Olivier
• Is Part Of: Chemistry. Volume 24:Issue 49(2018)
• Page Start: 12992
• Page End: 13001
• Publication Date: 2018-07-26
• Subjects: carbon nanotubes -- catalysis -- click chemistry -- functionalization -- PAMAM dendrimer; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201802301
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: Polyamidoamine (PAMAM) dendrimers were covalently immobilized on multi‐walled carbon nanotubes (MWNT) by two "grafting to" strategies. We demonstrate the existence of non‐covalent interactions between the two components but outline the superiority of our two grafting approaches, namely xanthate and click chemistry. MWNT surfaces were functionalized with activated ester and propargylic moieties prior to their reaction with PAMAM or azido‐PAMAM dendrimers, respectively. The grafting of PAMAM generations 0 to 3 was evaluated with X‐ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), and transmission electron microscopy (TEM). The versatility of our hybrids was demonstrated by post‐functionalization sequences involving copper alkyne–azide cycloaddition (CuAAC). We synthesized homogeneous supported iridium complexes at the extremities of the dendrimers. In addition, our materials were used as templates for the encapsulation of Pd nanoparticles (NPs), validating our nanocomposites for catalytic applications. The palladium‐based catalyst was active for carbonylative coupling over five consecutive runs without loss of activity. Abstract : Hard graft : The covalent grafting and non‐covalent immobilization of polyamidoamine (PAMAM) dendrimers on multi‐walled nanotubes (MWNTs) is reported and compared. The resulting hybrids were further derivatized, to immobilize homogeneous‐like iridium complexes or Pd nanoparticles. These were demonstrated to be efficient for catalytic applications.