An alkynyl-protected Ag_13−xCu_6+x nanocluster for catalytic hydrogenation

Abstract

A novel alkynyl-stabilized silver-copper alloy nanocluster with the composition of [Ag13-xCu6+x(tBuC6H4C≡C)14(PPh3)6](SbF6)3 was prepared by (PPh3)2CuBH4-mediated reduction approach. The nanocluster featured a centred disordered-octahedral Ag7Cu6 kernel, which was protected by hybrid...

Hydride-doped Ag17Cu10 nanoclusters as high-performance electrocatalysts for CO2 reduction

“…These values are comparable to those in other Ag/Cu alloy nanoclusters co-protected by phosphine and alkynyl ligands. 62 , 63 In the Ag 4 /Ag 4 /Cu 4 /Ag 4 /Ag 4 five-shell structure, the identical rectangles of the first and fifth Ag 4 are arranged orthogonally, with the Ag-Ag bond lengths of the longer side 4.4160 Å and shorter 2.7920 Å, respectively ( Figure 2 E, marked as green). Similarly, the Ag 4 rectangles in the second and fourth shells are orthogonal to each other as well, although their bond lengths are slightly different (longer side 9.5351 and shorter 2.9762 Å, red in Figure 2 E).…”

Alkynyl‐Protected Bimetallic Nanoclusters with a Hybrid Mackay Icosahedral Ag42Cu12Cl Kernel and an Octahedral Ag22Cu12 Kernel

“…Although thiolate‐protected Ag−Cu nanoclusters such as Ag 17 Cu 12 (SSR) 12 (PPh 3 ) 4 , [Ag 20 Cu 12 (SR) 14 (Dppm) 6 Br 8 ] 2+ , [Ag 28 Cu 12 SR 24 ] 4− , [Ag 61 Cu 30 SR 38 S 3 ] + and [Ag 77 Cu 22 (SR) 48 ] 2+ have been reported, [31–38] examples of alkynyl‐protected Ag−Cu bimetallic clusters have been limited [39–45] . Herein, we report a direct reduction strategy for the preparation of alkynyl‐protected Ag−Cu nanoclusters.…”

“…Although [31][32][33][34][35][36][37][38] examples of alkynyl-protected AgÀ Cu bimetallic clusters have been limited. [39][40][41][42][43][44][45] Herein, we report a direct reduction strategy for the preparation of alkynylprotected AgÀ Cu nanoclusters. Two AgÀ Cu alloy nanoclusters were successfully synthesized, (Ph 4 P) 1a and 1b).…”

Cu26 Nanoclusters with Quintuple Ligand Shells for CO2 Electrocatalytic Reduction

“…Atomically precise metal nanoclusters with a crystal structure determined remain a unique class of nanomaterials in terms of their role in illustrating structure–property relationships. − With size, composition, and structure precisely determinable and readily tunable, metal nanoclusters have found wide applications in fields including catalysis, biology, and electronics. − Such nanocatalysts with molecular characteristics have especially been regarded as model systems to probe catalytically active sites and uncover the reaction mechanism of nanocatalysis at the molecular level. − The past several decades have thus witnessed significant efforts in optimizing the activity, selectivity, and stability of cluster-based catalysts in various chemical transformations via multiple strategies such as ligand engineering, composition tuning, and structure tailoring. − In the progress, the reactions have been extended from thermal catalysis and electrocatalysis to photocatalysis, ligands from phosphine, thiol, and alkynyl to N -heterocyclic carbene, and metals from gold, silver, and copper to platinum and palladium. ,− ,− …”