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Isolation of Carboxylic Acid-Protected Au25 Clusters using a Borohydride Purification Strategy

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dc.contributor.authorShivhare, Atal
dc.contributor.authorWang, Lisa
dc.contributor.authorScott, Robert WJ
dc.date.accessioned2018-11-21T15:02:05Z
dc.date.available2018-11-21T15:02:05Z
dc.date.issued2015
dc.description.abstractWe report the synthesis of 11-mercaptoundecanoic acid (11-MUA) and 16-mercaptohexadecanoic acid (16-MHA) protected Au25 clusters with moderate yields (∼15%) using a NaBH4 purification strategy. UV–vis spectroscopy, transmission electron microscopy (TEM), and matrix-assisted laser desorption/ionization (MALDI) mass spectrometry were employed to study the entire process of the isolation of 11-MUA-protected Au25 clusters from a polydisperse Au cluster solution. UV–vis and TEM data clearly show the formation of a polydisperse mixture, which upon the addition of NaBH4 leads to the growth and precipitation of non-Au25 clusters, leaving the Au25 clusters behind. MALDI MS shows the molecular ion peak for the 11-MUA-protected Au25 cluster. 11-MUA-protected Au25 clusters in THF were purified by slowly increasing the pH of the solution, which leads to the complete deprotonation of carboxyl groups on the surface and eventually precipitation of Au25 clusters. Further protonation of these clusters by acetic acid leads to their solubilization in THF. These results show that, owing to the inherent stability of Au25 clusters, a NaBH4 purification strategy can be used to isolate Au25 clusters with surface carboxylic acid functionalities from a polydisperse Au cluster solution.en_US
dc.description.sponsorshipNSERCen_US
dc.description.versionPeer Revieweden_US
dc.identifier.citationA. Shivhare, L. Wang, R. W. J. Scott, Langmuir, 2015, 31, 1835–1841.en_US
dc.identifier.doi10.1021/la504292y
dc.identifier.urihttp://hdl.handle.net/10388/11526
dc.publisherAmerican Chemical Societyen_US
dc.subjectClustersen_US
dc.subjectGolden_US
dc.subjectSynthesisen_US
dc.titleIsolation of Carboxylic Acid-Protected Au25 Clusters using a Borohydride Purification Strategyen_US
dc.typeArticleen_US

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