Pd- And Au-Induced Circular and Fibrous Polymer Gelation via Thiocarbonyl Groups and High Pd Catalyst Activity

Daisuke Nagai, Ayaka Kubo, Moeko Morita, Naoyuki Shimazaki, Yasuyuki Maki, Hiroyuki Takeno, Masanobu Mori, Hiroki Uehara, Takeshi Yamanobe

Research output: Contribution to journalArticlepeer-review

Abstract

Self-assembled gelation behavior of a hydrophilic polymer bearing a metal-coordination unit with metal ions (PdIIor AuIII) was investigated upon addition of a dispersed aqueous solution of the polymer to an aqueous solution of metal ions. Self-assembled gels with different morphologies were formed depending on the metal ions used. Spherical and fibrous gels were formed by gelation with PdIIand AuIIIions, respectively. The mechanism for formation of the different gel morphology was examined by measuring cross-linking rates, examining coordination sites, and determining mechanical properties. The PdIIself-assembled gels efficiently catalyzed the Mizoroki-Heck cross-coupling reaction of a variety of aryl halides and olefins with a turnover number (TON) and turnover frequency (TOF) of greater than 2,762,000 and 138,100 h-1, respectively. These are the greatest TON and TOF values for heterogeneous polymeric catalysts of the Mizoroki-Heck reaction. The AuIIIself-assembled fibrous gels, which had nano-order diameter, contained uniformly dispersed gold nanoparticles and could be synthesized by a facile method, i.e., the dropwise addition of a dispersed aqueous solution of the polymer to an aqueous solution of AuIIIion.

Original languageEnglish
Pages (from-to)2211-2219
Number of pages9
JournalACS Applied Polymer Materials
Volume2
Issue number6
DOIs
Publication statusPublished - Jun 12 2020

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Process Chemistry and Technology
  • Organic Chemistry

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