Localization of the Au-Au bond strength in the triplet excited state of the [Au(CN)₂ ^-] oligomers revealed by ultrafast time-domain Raman spectroscopy.

ABSTRACT: Photo-induced Au-Au bond formation and subsequent ultrafast dynamics of the [Au(CN)₂ ^-] oligomers have been attracting much interest. To fully understand this unique photochemical process, it is important to elucidate the oligomer size dependence of the structure and dynamics in the excited state. In this study, we use time-resolved impulsive stimulated Raman spectroscopy to obtain Raman spectra of large [Au(CN)₂ ^-] oligomers, the tetramer and pentamer, in the lowest excited triplet (T₁) state. We observe a frequency shift of the Au-Au stretch vibration, reflecting an ultrafast bent (zigzag)-to-linear structural change for the T₁ tetramer, as in the case of the T₁ trimer, indicating that this type of structural ch

SUBMITTER: Liu L 

PROVIDER: S-EPMC12690810 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature