Chemistry Reference
In-Depth Information
Fig. 19 IMS determined experimental cross section for gold cluster cations (
black circles
)Au
n
+
and anions (
grey circles
)Au
n
at 300 K. For the same n value, the anions clearly have a larger
cross section. For
n
ΒΌ
12; a bimodal arrival time is observed indicating the presence of 2 isomers.
Figure reproduced from [
209
]
Fig. 20 IM-MS/MS driftscope plot showing
m/z
(
y
axis) versus drift time (
x
axis) for the analysis
of Au
25
(SCH
2
CH
2
Ph)
18
. Inset
a
shows an expansion of the isotopic distribution of the parent ion,
Au
25
(SCH
2
CH
2
Ph)
18
. The CID of Au
25
(SCH
2
CH
2
Ph)
18
results in the fragmentation of the
[-SR-Au-SR-Au-SR-] staples as shown by the slant oval
b
. Fragmentation of the Au
13
(SR)
m
(S)
n
core is shown by the vertical oval
c
, and the small
ionic fragments are shown by
d
.
Figure reproduced from [
216
]
[
211
]. Zachariah et al. have studied gold nanorods [
212
], aggregation and kinetics
of colloidal gold [
211
] and the conformation of bovine serum albumin on AuNPs
[
213
]. Hackley et al. reported recently the use of a new hyphenated technique where
ES-DMA was coupled to ICP-MS. They show that this technique can be used to
segregate gold nanoparticles based on their size and their elemental composition
[
214
,
215
]. ES-DMA and variants were also coupled directly to mass spectrometry
(ESI-IMS) and used to decipher the structures of ligated gold nanoparticles. Dass
