Mono- and hexa-palladium doped silver nanoclusters stabilized by dithiolates

Abstract

Structurally precise palladium doped silver-nanoclusters [PdAg20] and [Pd6Ag14(S)] stabilized by twelve dithiophosphate ligands have been isolated. The latter is the first example where a hexa-palladium(0) core is embodied within a silver(i) cluster.

Brookite TiO2 Nanoparticles Decorated with Ag/MnOx Dual Cocatalysts for Remarkably Boosted Photocatalytic Performance of the CO2 Reduction Reaction

“…The high-resolution Ag 3d XPS spectrum (Figure 2c) of the 0.5Ag-BT composite can be fitted into two groups of BE peaks, whereby the stronger ones at 367.5 (3d 5/2 ) and 373.5 (3d 3/2 ) eV are attributed to the metallic Ag species, and others with relatively weak intensities located at 368.2 (3d 5/2 ) and 374.2 (3d 3/2 ) eV correspond to Ag(I) species. 45,46 This indicates that the metallic Ag-nanoparticle-decorated composite coexists with a very small number of Ag(I) species that may not be photoreduced during the photodeposition process. Moreover, the 0.5Ag-BT(tw) composite, derived from a similar photodeposition process of the 0.5Ag-BT-yMn composites but without the addition of MnSO 4 solution and while extending the light illumination time from 0.5 to 1.0 h, still exhibits an obvious signal of the Ag(I) species.…”

Toward Controlling the Electronic Structures of Chemically Modified Superatoms of Gold and Silver

“…SCXRD and X‐ray absorption fine structure (XAFS) showed that a single atom of Ir, Pd or Pt exclusively occupies the central position of Au 13 (8e) and Ag 13 (8e) to form Ir/Pd/Pt@Au 12 and Pd/Pt@Ag 12 , respectively. [ 191–208 ] The selective doping of Ir/Pd/Pt at the center of Au 13 (8e) [ 191–201 ] is ascribed to the stronger Ir/Pd/PtAu bonds compared to the AuAu bonds and may contribute to the higher stability in Pd/Pt@Au 12 . [ 198,209 ] The structure of Pd/Pt@Ag 12 was also explained in a similar manner.…”

“…[ 198,209 ] The structure of Pd/Pt@Ag 12 was also explained in a similar manner. [ 202–208 ] In contrast, SCXRD revealed that more than single Ag atoms are preferentially located at the surface sites of the Au 13 (8e) core, resulting in the formation of Au@Ag x Au 12– x . [ 210–220 ] The single Au atom can be selectively doped to the central position of Ag 13 (8e) to form Au@Ag 12 .…”

Activation of atom-precise clusters for catalysis

“…59,[119][120][121][122] Similar improvement in stability and catalytic performance has been observed for atom-precise Ag-based bimetallic clusters. [123][124][125][126] While most of the existing studies have reported the catalytic activities of bimetallic clusters with protecting ligands intact, Xie et al reported the enhanced catalytic activity of thermally activated Pd 1 Au 24 (SC 12 H 25 ) 18 clusters on multiwalled carbon nanotube supports. 59 Their results showed that no activity was found for unactivated Pd 1 Au 24 (SC 12 H 25 ) 1 and Au 25 (SC 12 H 25 ) 18 systems, but activated catalysts were active for aerobic oxidation of benzyl alcohol.…”