In the present work, the effects of pressure on the electronic, vibrational, and structural properties of neutral and negatively charged Au25(SR)18 clusters are investigated up to 15 GPa combining UV-vis absorption and Raman spectroscopy. We show that Au25(SR)18 clusters undergo three structural transitions in the 0-15 GPa range located at around 0.8, 6, and 11 GPa. Results indicate that these phase transitions are intrinsic to the M25(SR)18 structure and independent of the pressurization conditions, type of ligand, and charge state. The reported Raman measurements show that vibrational spectroscopy is a powerful tool for structural tracking of atomically precise metal nanoclusters under the application of pressure.
High-Pressure States of the Au25 Cluster
Rosa-Gastaldo, Daniele;
2025
Abstract
In the present work, the effects of pressure on the electronic, vibrational, and structural properties of neutral and negatively charged Au25(SR)18 clusters are investigated up to 15 GPa combining UV-vis absorption and Raman spectroscopy. We show that Au25(SR)18 clusters undergo three structural transitions in the 0-15 GPa range located at around 0.8, 6, and 11 GPa. Results indicate that these phase transitions are intrinsic to the M25(SR)18 structure and independent of the pressurization conditions, type of ligand, and charge state. The reported Raman measurements show that vibrational spectroscopy is a powerful tool for structural tracking of atomically precise metal nanoclusters under the application of pressure.
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