Back Cover: Supported Anionic Gold Nanoparticle Catalysts Modified Using Highly Negatively Charged Multivacant Polyoxometalates (Angew. Chem. Int. Ed. 34/2022)

Abstract

Supported gold nanoparticle catalysts have attracted growing interest in aerobic oxidation reactions. In their Research Article (e202205873), Kazuya Yamaguchi, Kosuke Suzuki et al. describe a method for the design of supported anionic gold nanoparticle catalysts using negatively charged multivacant polyoxometalates. The electronic states of the catalysts can be sequentially modulated, and the catalyst prepared using [SiW9O34]10− acted as a reusable heterogeneous catalyst, showing superior catalytic activity and enhanced stability compared to conventional catalysts.

Recent Advances in Hybrid Materials of Metal Nanoparticles and Polyoxometalates

“…[4] This method is most widely adopted owing to its practical utility and wide applicability to various types of POMs because the high negative charges and coordination sites of common POMs can satisfy the role of stabilizing ligands. [4][5][6][7][8][9][10] The second method is based on the reversible redox properties of POMs, whereby reduced POMs, prepared by electroreduction or photoreduction, are used as both the ligands and reductants. [4, 6g, 7c] In this method, despite the limitation that only redox-active POMs with appropriate redox potentials for metal ions can be used, the control of particle size and morphology can be achieved relatively easily because of the following two reasons: i) POMs can simultaneously provide a reduction ability and a stabilizing ability and ii) the reaction conditions of the photochemical and electrochemical reactions are more easily modulated than the thermal reduction method.…”

“…This approach has been most widely adopted owing to its practical feasibility in terms of preparation and characterization, and its wide applicability to various POMs. [7][8][9][10] Additionally, the deposition of these hybrid materials on supporting materials is an effective method to deal with the intrinsic instability of these POM-modified metal nanoparticles. As there are several important reviews covering the preparation and characterization of POMmodified metal nanoparticles, [4] we herein focus on recent advances in this field as well as promising aspects related to their applications in various fields, including electrochemistry, photochemistry, catalysis, SERS, and biochemistry.…”

Control the Single‐, Two‐, and Three‐Photon Excited Fluorescence of Atomically Precise Metal Nanoclusters

“…The advancement in nanoscience has brought much excitement to the material science field since nanomaterial scientists are capable of precisely controlling the physical‐chemical properties at the atomic level to yield advanced materials with extraordinary performances [1, 2] . Among these nanomaterials, the research of metal nanoclusters in the ultrasmall size regime (<2 nm of the metallic kernel) has been one of the increasing worldwide interests [3–15] . Metal nanoclusters feature quantum size effects and discrete electronic energy levels, rendering them prominent nanomaterials for in‐depth structure‐property studies with applications in catalysis, chemical sensing, bioimaging, and nanomedicine [16–23] .…”

“…[1,2] Among these nanomaterials, the research of metal nanoclusters in the ultrasmall size regime (< 2 nm of the metallic kernel) has been one of the increasing worldwide interests. [3][4][5][6][7][8][9][10][11][12][13][14][15] Metal nanoclusters feature quantum size effects and discrete electronic energy levels, rendering them prominent nanomaterials for in-depth structure-property studies with applications in catalysis, chemical sensing, bioimaging, and nanomedicine. [16][17][18][19][20][21][22][23] Photoluminescence (PL) is amongst the most intriguing and fascinating characteristics of metal clusters.…”

A Calix[4]resorcinarene-Copper(II) Based Supramolecular Nanocapsule with Encapsulated Polyoxometalates for Enhanced Photocatalytic Activity

“…Polyoxometalates (POMs) as a large class of metal oxide clusters have received considerable research attention owing to their extensive use in electrochemistry, − biosensors, − catalysis, − etc. Particularly, POMs featured abundant redox properties, photochemical activities, and semiconductor-like characteristics, thereby making them promising photocatalytic candidates. − Nevertheless, their low specific surface area and high solubility largely limited their applications as recyclable heterogeneous photocatalysts. , To overcome this issue, POMs were combined with various materials, such as mesoporous silicas − and zeolites − et al Additionally, POMs usually exhibit wide band gaps with ultraviolet light absorption and low sunlight utilization. , As a result, the construction of POM-combined materials with visible light responses is greatly necessary. , In this facet, the combination of POMs with metal–organic complexes (MOCs) provided a feasible strategy for the design of stable POM-based materials with visible light responses. , …”