Gold/Palladium Bimetallic Alloy Nanoclusters Stabilized by Chitosan as Highly Efficient and Selective Catalysts for Homocoupling of Arylboronic Acid

Abstract

Aerobic oxidative homocoupling of arylboronic acid under acidic aqueous conditions (pH 4.0) using bimetallic Au/Pd alloy nanoclusters stabilized by chitosan has been investigated. It was found that a Au0.81Pd0.19 catalyst (3.1 ± 0.8 nm) exhibited superior catalytic activities as compared to monometallic Au (2.3 ± 0.3 nm) and other series of bimetallic nanoclusters, giving the corresponding biaryls in nearly quantitative yield.

The 2nd Molecular Materials Meeting (M3@Singapore)

“…Another review on fuel cells using carbon nanotube-based materials, contributed by Sahoo et al [9] (Nanyang Technological University, Singapore), summarizes the use of catalytic support for enhanced electrocatalytic activity, the use of metal free electrocatalysts for oxygen reduction reaction, and different types of fillers in electrolyte membranes. Among the original research papers, this issue also features the work of Sakurai et al [10] (Institute for Molecular Science, Japan), who discovered that alloyed nanoparticles/nanoclusters of Au/Pd with a chitosanfunctionalized surface at a given size and Au/Pd ratio present an excellent catalytic property for aerobic oxidative homocoupling of arylboronic acid (Fig. 2b) under acidic aqueous conditions, with near-quantitative yield.…”

“…[8] (b) Au/Pd nanoparticle/nanocluster catalyst for aerobic oxidative homocoupling of arylboronic acid. [10] easily fabricated into 2D photoluminescent patterns via UV illumination through a copper mask (Fig. 4b).…”

The 4th Molecular Materials Meeting (M3) @ Singapore

“…2013, 66 (9)] introduced papers that illustrated various aspects of molecular materials research, [15] e.g. experimental revelation of heterocyclic triazole as a moiety that enhances magnetic property of dinuclear Cu II complexes, [16] theoretical modelling resultant matching requirement of nuclear vibrations with the energy levels in rational molecular and material design for organic photovoltaics, [17] matching of optical band gaps with the electrochemical band gaps via tuning of the molecular structure of polymers to enhance redox stability, [18] polyurethane/clay nanocomposites with high mechanical strength and good thermal conductivity, [19] review and perspective of nanoparticles-hydrogel hybrid materials, [20] fabrication of highly sensitive SERS substrates at low cost for sensingbased analytical applications, [21] and a review on the combination of the design of molecular materials with physical structures (e.g.…”

“…[7] It covered the harnessing of nanotechnology for new applications, e.g. electro-responsive core-shell nanoparticles for rheology tuning, [8] chitosan-coated Au/Pd alloy nanoparticles and nanoclusters as catalysts for aerobic oxidative homocoupling reactions, [9] carbon nanotube-based materials to catalyze fuel cell reactions, [10] and CdTe-based hybrid fibres to enable low-voltage-driven electroluminescence devices. [11] In the area of organic semiconductor research, the edition focussed on the structure-property relationship that leads to design and synthesis of high performance molecular materials, e.g.…”

The 3rd Molecular Materials Meeting (M3) @ Singapore

“…[7] The nanoparticle papers typified the harness of nanotechnology to enable new applications, e.g. using electro-responsive core-shell nanoparticles for rheology tuning, [8] carbon nanotube-based materials as catalysts in fuel cells, [9] using chitosan-functionalised Au/Pd alloy nanoparticles/nanoclusters for catalysis of aerobic oxidative homocoupling reactions, [10] and CdTe based hybrid fibres enabled low-voltage-driven electroluminescence devices, [11] etc; papers on organic semiconductor research focussed on the structure-property relationship that leads to design and synthesis of high performance molecular materials, e.g. heterocyclic dyes for efficient dye-sensitised solar cells, [12] phenyl-1H-pyrrole end-capped thiophenes for organic field-effect transistors, [13] and pyridine incorporated dihexylquaterthiophene as blue emitter in organic light emitting diode applications.…”