Ultrafine copper oxide nanoparticles immobilized on poly (4-vinylpyridine)-grafted UiO-66-NH2 as heterogeneous catalyst for oxidative homocoupling of terminal alkynes

Rui Ding, Hengtong Xia, Yan Wu, Yunhan Li, Wenzhong Yang, Hui Xu

Research output: Contribution to journalArticlepeer-review

Abstract

Terminal alkyne homocoupling is an effective route to synthesize 1,3-diynes, which are crucial components of many fine chemicals and natural products. However, the reaction often faces challenges of catalyst recovery and typically necessitates the introduction of basic additives, which limits its practical applicability. Here, we have developed a green and efficient Cu2O@UiO-66-g-P4VP nanocatalyst that exhibits outstanding activity for homocoupling terminal alkynes under mild, base- or ligand-free conditions. The characterization results indicate that the nitrogen atoms in P4VP interfere with the electronic structure of Cu in Cu2O nanoparticles, causing the N electrons to shift onto Cu. Density functional theory (DFT) calculations suggest that this catalytic system facilitates the activation of oxygen on the copper surface, promoting the coupling reaction. This work provides a feasible strategy for the rational fabrication of MOF-supported polybase and Cu2O nanocrystals as heterogeneous nanocatalysts in the oxidative homocoupling of alkynes.

Original languageEnglish
Article number135328
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume703
DOIs
StatePublished - 20 Nov 2024

Keywords

  • Alkyne homocoupling
  • Copper oxide nanoparticles
  • Heterogeneous catalyst
  • Metal organic framework
  • Poly(4-vinylpyridine)

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