Chemistry Reference
In-Depth Information
Fig. 8 (a) ESI-MS and (b) HR-TEM of the Au
333
(SC
2
H
4
Ph)
79
nanoclusters. The
inset
of (a)
shows the (M + Cs
x
) adducts. Adapted with permission from [
41
]
4.1.4 The Case of Au
333
(SR)
79
The size-focusing method was extended to the largest ever Au
333
(SR)
79
nanocluster
[
41
]. The synthetic protocol of this 2.2 nm atomically precise nanocluster is similar
to the case of Au
144
(SR)
60
. Both cluster precursors were made through the
two-phase method, with a major difference in the HAuCl
4
to PhC
2
H
4
SH ratio
(i.e., 1:2 in the case of Au
333
(SR)
79
, instead of 1:3 in Au
144
(SR)
60
). Figure
8
shows a comparison of ESI-MS and TEM characterization of Au
333
(SR)
79
nanoclusters. This giant nanocluster approaches the current detection limit of
ESI-MS. New methods should be developed in future work to cope with giant
nanoclusters of larger size.
