Figure 1
Structure of Au12Ag32(p-MBA)304−. Complete X-ray-determined structure shown in (a) space-filling view and (b) ball-and-stick view (out-of-plane ligands removed for clarity). The core structure is shown as (c) an Au12 icosahedral inner shell, which is nested inside of (d) an Ag20 dodecahedral outer shell, together making (e) a bimetallic 32-atom excavated dodecahedral core. Other colors: red – O; grey – C; yellow – S (H not shown). The overall diameter of the MPC was measured to be about 28 Å, while the diameter of the inorganic portion of the structure was 17 Å and the metallic Au12Ag20 dodecahedral core was 9 Å. Measurements were made between the centers of opposing atoms in the structure. |