Raman modes, dipole moment and chirality in periodically positioned Au8 clusters

A. Pradhani, O. Halder, S. Nozaki, S. Rath*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


This study reports the solution-based assembly of hexagonal + 1 shaped Au8 clusters surrounded by six ligands into a local periodic structure (LPS) of periodicity 1.47 nm, which was confirmed by experimental and theoretical Raman scattering analyses as well as transmission electron microscopy, X-ray diffraction and small angle X-ray scattering measurements. The enhancement of the net electric dipole moment to 21.17 Debye is due to the rearrangement of the charge distribution in the electronic states of the LPS. This results in exciton-exciton coupling through dipole interactions, which was evidenced by the splitting of the excitonic states in the circular dichroism (CD) spectra. The strong negativity of the CD index at the longer wavelength confirms the negative chirality of the LPS-Au8.

Original languageEnglish
Pages (from-to)65208-65213
Number of pages6
JournalRSC Advances
Issue number80
StatePublished - 24 Jul 2015
Externally publishedYes


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