open access

https://hdl.handle.net/2115/82867

Terahertz Raman Spectroscopy of Ligand-Protected Au8 Clusters

英語

2020-10-01

American Chemical Society

The Journal of Physical Chemistry Letters

11(19)

7996-8001

For ligand-protected gold clusters, geometrical differences of gold cores and/or the presence of secondary gold core–ligand interactions influence their unique optical and electronic properties and can, in principle, be detected by spectral changes of gold core vibrations (phonon modes) in ultralow-frequency Raman spectroscopy. We report experimental and theoretical Raman spectra of Au8 clusters protected by phosphine ligands particularly in the “gold cluster fingerprint” region from 50 to 150 cm–¹ Raman shift (1.5 to 4.5 terahertz, THz). A characteristic core breathing mode observed at ca. 123 cm–¹ was sensitive to differences of core geometries. A new band was found at ca. 150 cm–¹, originating from a local strain on a polyhedral gold core caused by weak Au···π interactions. THz Raman spectroscopy can be utilized for metal nanoclusters to visualize core structural changes and Au···π interactions, which cannot be captured by single crystal X-ray analysis.

学術雑誌論文

Accepted Manuscript

This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpclett.0c02227.

1948-7185

AA1260018X