Monolayer protected gold clusters show unique optical properties that are correlated to their structure as well as size. Structurally, gold clusters possess specific core-gold and shell-gold that has contribution from ligands and these unique features influence their optical properties significantly. The core-shell interactions in quantum sized monolayer protected gold clusters (Au25, Au38, Au67, Au102 and Au144) are probed with temperature-dependent optical absorption as well as ultrafast visible luminescence dynamics measurements.1-3 The electron-phonon interaction strengths were determined from temperature-dependent absorption shifts and corresponding coupling constants were obtained from temperature-dependent oscillator strengths. Interesting number of optical transitions are observed for Au144 at low temperatures in the visible region while such transitions are not pronounced for Au67 and Au102 clusters. The origin of the transitions in these clusters will be discussed. Unusual solvent-dependent temperature dependence is observed in biicosahedral Au25 clusters that is attributed to hydrogen bonding interactions.References Devadas, M. S.; Bairu, S.; Qian, H.; Sinn, E.; Jin, R.; Ramakrishna, G. J. Phys. Chem. Lett. 2011 , 2, 2752-2758.Devadas, M.S.; Kim, J.; Sinn, E.; Lee, D.; Goodson, T. III; Ramakrishna, G. J. Phys. Chem. C 2010 , 114, 22417-22423.Devadas, M. S; Thanthirige, V. D.; Bairu, S.; Sinn, E.; Ramakrishna, G. J. Phys. Chem. C. 2013 , articles ASAP.

Electron-phonon interactions in quantum-sized gold clusters

247th National Meeting (2014)

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