Fig. 1. (A) Conversion of polydisperse Au NPs into [Au25(TPP)10(PET)5X2]2+ NCs followed by UV-Vis spectroscopy. The crystal structure is shown in the inset. Inset color labels: Au, yellow; S, blue; P, red; X: Cl and/or Br, green. (B) Evolution of the peak height at 415 and 675 nm during the etching process. Data and error bars were obtained by averaging data sets from the syntheses and plotting the standard deviation. (C) TEM and HRTEM (inset) of drop casted Au25 NCs. (D) 31P NMR spectrum of Au25 NCs in CD2CL2. (E) High resolution ESI-MS of Au25 NCs and zoom into the region of m/z 4196 (inset).
