In the 1 H NMR spectra of S@Ag54 and I@Ag54 (Figure ), the two peaks at 1.63 and 1.38 ppm can be attributed to the protons of S t Bu and SO3 t Bu, respectively. The integral values of these peaks revealed that S@Ag54 contained 12 SO3 t Bu ligands, while I@Ag54 contained 11 SO3 t Bu ligands.