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An Atomically Precise Alkynyl‐Protected PtAg42 Superatom Nanocluster and Its Structural Implications
Abstract:The synthesis and structure determination of an alkynyl‐protected Pt‐doped Ag superatom nanocluster, PtAg42(C≡CC6H4CH3)28](SbF6)6 (1) , are reported. The metallic core of this cluster can be viewed as a concentric three‐shell Russian doll comprising Pt@Ag12@Ag30, in which the missing icosidodecahedral Ag30 shell and a new structural unit, M43, have been observed. On the surface of 1 , 28 alkynyl groups and 4 SbF6? anions were found co‐protecting it. The protective role of SbF6? in nanoclusters is unprecedented. Moreover, of the 28 alkynyl ligands, 12 are connected not only with the outermost Ag30 shell, but also the inner Ag12 shell through the twelve pentagonal faces of the outermost icosidodecahedral Ag30 shell. Overall, by determining the crystal structure of 1 , we discovered the missing icosidodecahedral Ag30 shell and the protective effect of SbF6? anions and demonstrated a novel M43 structural unit and the unique penetrability of pentagonal faces.
Keywords:alkynes  doping  icosidodecahedrons  silver nanoclusters  superatoms
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