Fig. 1
From: Precise control of alloying sites of bimetallic nanoclusters via surface motif exchange reaction
Synthesis of Ag32@Au12 from Ag44 nanoclusters. a, c Ultraviolet–visible absorption and b, d electrospray ionization mass spectra of a, b [Ag44(SR)30]4− and c, d [Ag32Au12(SR)30−b Cl b ]4− with b = 0–2 and SR denoting thiolate ligand. Insets in a, c are polyacrylamide gel electrophoresis results (left) and digital photos (right) of the corresponding nanoclusters. The zero absorbance is indicated by the dotted lines in a, c. The left inset in b shows the experimental (black line) and simulated (magenta line) isotope patterns of [Ag44(SR)30]4−, and the right inset illustrates the crystal structure of [Ag44(SR)30]4− (drawn according to the reported structure48; color legend: Ag (gray/light blue/purple); S (orange); C, O, and H are omitted for clarity). The left inset in d is the zoom-in mass spectrum of [Ag32Au12(SR)30-b Cl b ]4−, and the right inset shows the experimental (black line) and simulated (magenta line) isotope patterns of [Ag32Au12(SR)30]4−
