We present the synthesis
and structural characterization of four
distinct crystal structures, [PtAg20{S2P(O
n
Pr)2}12]0.4[Ag20{S2P(O
n
Pr)2}12]0.6 (1), [PtAg20{S2P(O
n
Pr)2}12]0.25[Ag20{S2P(O
n
Pr)2}12]0.75 (2), [PtAg20{S2P(O
i
Pr)2}12] (3),
and [PtAg20{S2P(O
i
Bu)2}12] (4), utilizing two primary
synthetic routes: galvanic replacement and coreduction. Despite different
synthetic approaches, the PtAg20 skeleton exhibited variations
in symmetry, primarily due to the different arrangements of capping
silver atoms. Positive-ion ESI-MS verified the composition, aligning
well with theoretical calculations. Notably, the surface of these
NCs demonstrates fluxional properties, suggesting rapid and dynamic
changes in solution. Variable-temperature 31P{1H} NMR experiments provided insights into the fluxional nature of
the NC surface and the potential for symmetry transformations in solution.