Chemistry Reference
In-Depth Information
Fig. 7 (a) Positive mode MALDI-TOF mass spectra (MS) (in
light blue
) and ESI-MS (
dark blue
)
of Au
67
(SCH
2
CH
2
Ph)
35
nanomolecules. (b) Positive mode MALDI-TOF-MS (in
light red
) and the
negative mode ESI-MS of Au
67
(SC
6
H
13
)
35
.(c) Positive mode (
top
) and negative mode (
bottom
)
ESI mass spectra of Au
67
(SC
6
H
13
)
35
.(d) ESI mass spectra of Au
67
(SR)
35
nanomolecules protected
by phenylethanethiolate (
blue
) and
n
-hexanethiolate (ligands) showing a mass difference of
350 Da used to calculate the number of ligands in the Au
67
to be 35. Reprinted with permission
from [
4
]. Copyright 2013 American Chemical Society
Interestingly, Au
102
(SCH
2
CH
2
Ph)
44
was not observed with phenylethanethiol
and hexanethiol ligands. This could be due to the nature of the thiol group. For
example,
p
-mercaptobenzoic acid is aromatic and hydrophilic, when compared
