Homoleptic Alkynyl‐Protected Gold Nanoclusters: Au₄₄(PhC≡C)₂₈ and Au₃₆(PhC≡C)₂₄

Abstract

For the first time total structure determination of homoleptic alkynyl-protected gold nanoclusters is reported. The nanoclusters are synthesized by direct reduction of PhC≡CAu, to give Au (PhC≡C) and Au (PhC≡C) . The Au and Au nanoclusters have fcc-type Au and Au kernels, respectively, as well as surrounding PhC≡C-Au-C (Ph)Au-C≡CPh dimeric "staples" and simple PhC≡C bridges. The structures of Au (PhC≡C) and Au (PhC≡C) are similar to Au (SR) and Au (SR) , but the UV/Vis spectra are different. The protecting ligands influence the electronic structures of nanoclusters significantly. The synthesis of these two alkynyl-protected gold nanoclusters indicates that a series of gold nanoclusters in the general formula Au (RC≡C) as counterparts to Au (SR) can be expected.

Confining Sub‐Nanometer Pt Clusters in Hollow Mesoporous Carbon Spheres for Boosting Hydrogen Evolution Activity

“…Pt 5 (GS) 10 clusters were first synthesized according to a modified method (see the Supporting Information for details) . The molecular purity of Pt 5 (GS) 10 has been examined by ultraviolet–visible (UV–vis) spectroscopy and matrix‐assisted laser desorption ionization time‐of‐flight mass spectrometry (MALDI‐TOF‐MS) . The wide absorption band from 250 to 400 nm in the UV–vis spectrum is the fingerprint of Pt 5 (GS) 10 clusters (Figure S1a, Supporting Information) .…”

Reversible Switching of Catalytic Activity by Shuttling an Atom into and out of Gold Nanoclusters

“…In the subnanometer size regime,every atom of acatalyst can have apotential influence on the overall performance, [1] and hence it is necessary to gain fundamental insights into catalysis of one atom on as pecial site.W ith the successful attainment of atomically precise metal nanoclusters capped by ligands, [2] where an atom of an anocluster can be replaced by af oreign atom without altering the atomic structure of the nanocluster, [3] an opportunity for unravelling catalysis of one doping atom has been provided. In the subnanometer size regime,every atom of acatalyst can have apotential influence on the overall performance, [1] and hence it is necessary to gain fundamental insights into catalysis of one atom on as pecial site.W ith the successful attainment of atomically precise metal nanoclusters capped by ligands, [2] where an atom of an anocluster can be replaced by af oreign atom without altering the atomic structure of the nanocluster, [3] an opportunity for unravelling catalysis of one doping atom has been provided.…”

An Atomically Precise Alkynyl‐Protected PtAg42 Superatom Nanocluster and Its Structural Implications

“…the door to understanding the alkynyl-gold interface and discoveringm any potential members of this new family of clusters; [25] Zheng et al andW ang et al then prepared severala lkynyl-capped Au-Ag alloyed nanoclusters,i nw hich somei mportant phenomena wereo bserved such as the promoting effects of surface ligands on catalysis by metal nanoparticles, promotion effect of chloride on clusterformation and site preferences in alkynyl-protected multimetallic nanoclusters. [26][27][28][29] In addition, alkynyl-protected Au-Cu alloyedn anoclusters with an icosidodecahedral Cu 30 shell [30] and an alkynyl-Cu interface, and homoleptic alkynyl-protected gold nanoclusters Au 44 [31] and Au 36 [31] have also been reported recently.H owever,r eports of another potential system, alkynyl-stabilized Ag nanoclusters, remain scarce compared with the well-documented gold nanoclusters.S of ar,o nly several alkynyl-protected Ag nanoclusters, e.g.,A g 19 , [32] Ag 25 , [32] Ag 35 , [33] andA g 74 [34] have been structurally determined.…”