jp9b05319_si_001.pdf (831.8 kB)
Super Polycationic Molecular Compounds: Au144(SR+)60 Clusters
journal contribution
posted on 2019-08-23, 18:33 authored by Kunihiro Narita, Yohei Ishida, Tetsu Yonezawa, Zhong HuangWe have recently
pioneered per-cationized molecular gold (Au) cluster
compounds. Herein, we present a new series of per-cationized Au cluster
compounds, Au144(SR+)60, which is
the largest reported compound with the most stable and studied Au
clusters. Although it is typically difficult to obtain a single composition
of a Au144 cluster due to the existence of similar-sized
quasi-stable compounds, optimized thermal etching and selective precipitation
made strict size focusing into a single Au144 composition
possible and produced Au144(SR+)60 with high atomic precision. In positive-mode high-resolution ESI-MS,
per-cationized Au144(SR+)60 clusters
with different numbers of PF6– counteranions
for the +12- to +21-charged states were observed. The Au144(SR+)60, 60(+) termini distributed over a spherical
surface of radius ∼2.5 nm, presented here, is, to the best
of our knowledge, the most polycationic molecular compound reported
thus far.