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Luminescent Ag clusters are prepared with lipoic acid (LA) as the ligand. Using a combination of mass spectrometry, optical spectroscopy and analytical ultracentrifugation, the clusters are found to be highly monodisperse with mass 5.6 kDa. We assign the chemical composition [Ag 29 (LA) 12 ] 3- to the clusters, where LA likely binds in a bidentate fashion. The Ag 29 clusters show slow degradation, retaining their deep red emission for at least 18 months if stored in the dark. Purification or exposure to light results in faster degradation. No other cluster species are observed during the degradation process. Once degraded, the clusters could easily be regenerated using NaBH 4 , which is not usually observed for thiolate-capped Ag clusters.

Characterisation, degradation and regeneration of luminescent Ag29 clusters in solution

Characterisation, degradation and regeneration of luminescent Ag₂₉ clusters in solution