Synthesis of Nanosheets Containing Uniformly Dispersed PdII Ions at an Aqueous/Aqueous Interface: Development of a Highly Active Nanosheet Catalyst for Mizoroki-Heck Reaction

Daisuke Nagai; Moeko Morita; Takeshi Yamanobe

doi:10.1021/acsomega.0c02403

Synthesis of Nanosheets Containing Uniformly Dispersed Pd^II Ions at an Aqueous/Aqueous Interface: Development of a Highly Active Nanosheet Catalyst for Mizoroki-Heck Reaction

ACS Omega. 2020 Jul 16;5(29):18484-18489. doi: 10.1021/acsomega.0c02403. eCollection 2020 Jul 28.

Authors

Daisuke Nagai¹, Moeko Morita¹, Takeshi Yamanobe¹

Affiliation

¹ Division of Molecular Science, Faculty of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma Prefecture 376-8515, Japan.

Abstract

A method was developed to synthesize a nanosheet at the interface of an aqueous layer of Pd^II ions and an aqueous layer of hydrophilic polymer bearing a metal coordination unit (HPMC). The nanosheet was synthesized through generation of an interface by the addition of an aqueous solution of Pd^II ions with a low specific gravity (1.03 g/cm³) to a dispersed aqueous solution of HPMC with a high specific gravity (1.50 g/cm³), resulting in rapid cross-linking at the interface. An electron probe microanalysis mapping image showed that the Pd^II ions were uniformly dispersed in the nanosheet. The nanosheet showed a high catalyst activity for the Mizoroki-Heck cross-coupling reaction with a turnover number (TON) and turnover frequency (TOF) greater than 3,333,333 and 138,889 h^-1, respectively. These are the greatest TON and TOF values reported for heterogeneous polymeric catalysts for the Mizoroki-Heck reaction.