Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 143, Issue 3, Pages 1273-1277Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.0c11509
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Funding
- Academy of Finland [292352, 294217, 319208]
- Swiss National Science Foundation [200020_172511]
- Swiss National Science Foundation (SNF) [200020_172511] Funding Source: Swiss National Science Foundation (SNF)
- Academy of Finland (AKA) [292352, 292352] Funding Source: Academy of Finland (AKA)
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High-resolution electrospray ionization ion mobility mass spectrometry has identified a gas-phase isomer of the well-studied Au-25(SR)(18) cluster, with relative abundance controlled by in-source activation. The measured properties of the new isomer match theoretical predictions closely, suggesting that structural dynamics play a role in gas-phase reactions of thiolate-protected gold clusters and that isomerization may be manipulated by external stimuli.
High-resolution electrospray ionization ion mobility mass spectrometry has revealed a gas-phase isomer of the ubiquitous, extremely well-studied Au-25 (SR)(18) cluster both in anionic and cationic form. The relative abundance of the isomeric structures can be controlled by in-source activation. The measured collision cross section of the new isomer agrees extremely well with a recent theoretical prediction (Matus, M. F.; et al. Chem. Commun. 2020, 56, 8087) corresponding to a Au-25(SR)(18)(-) isomer that is energetically close and topologically connected to the known ground-state structure via a simple rotation of the gold core without breaking any Au-S bonds. The results imply that the structural dynamics leading to isomerization of thiolate-protected gold clusters may play an important role in their gas-phase reactions and that isomerization could be controlled by external stimuli.
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