Fig. 10. (a) Schematic illustration of the size growth reaction from [Au25(SR)18]− to [Au44(SR)26]2− (yellow, Au; purple, S). (b and c) Ultraviolet-visible absorption and (d and e) electrospray ionization mass spectrometry spectra of (b and d) [Au25(SR)18]− and (c and e) [Au44(SR)26]2−. Reproduced with permission.81 Copyright 2017 Nature Publishing group.
