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Issue 47, 2016
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Characterisation, degradation and regeneration of luminescent Ag29 clusters in solution

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Abstract

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 [Ag29(LA)12]3− to the clusters, where LA likely binds in a bidentate fashion. The Ag29 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 NaBH4, which is not usually observed for thiolate-capped Ag clusters.

Graphical abstract: Characterisation, degradation and regeneration of luminescent Ag29 clusters in solution

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Supplementary files

Article information


Submitted
20 Jun 2016
Accepted
08 Nov 2016
First published
14 Nov 2016

This article is Open Access

Nanoscale, 2016,8, 19901-19909
Article type
Paper
Author version available

Characterisation, degradation and regeneration of luminescent Ag29 clusters in solution

M. van der Linden, A. Barendregt, A. J. van Bunningen, P. T. K. Chin, D. Thies-Weesie, F. M. F. de Groot and A. Meijerink, Nanoscale, 2016, 8, 19901
DOI: 10.1039/C6NR04958C

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