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Luminescent AgAu alloy clusters derived from Ag nanoparticles - manifestations of tunable Au-I-Cu-I metallophilic interactions

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dc.contributor.authorKrishnadas, K.R.
dc.contributor.authorUdayabhaskararao, T.
dc.contributor.authorChoudhury, S.
dc.contributor.authorGoswami, N.
dc.contributor.authorPal, S.K.
dc.contributor.authorPradeep, T.
dc.date.issued2014
dc.description.abstractLuminescent AgAu alloy quantum clusters are synthesized by a simple method that utilizes the galvanic reduction of polydisperse plasmonic silver nanoparticles. The clusters are characterized by ultraviolet-visible (UV/Vis) absorption spectroscopy, photoluminescence (PL) spectroscopy, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and matrix-assisted laser desorption ionization mass spectrometry (MALDI MS). Selective and tunable quenching of cluster luminescence by Cu-II ions is observed and depends highly on the solvent as well as the protecting ligands. Metal-ion selectivity is exclusively caused by metallophilic interactions with the cluster core, and the tunability depends on the nature of the protecting ligands as well as solvent effects. Detailed XPS and time-resolved luminescence measurements reveal that the tunability of luminescence quenching is achieved by the systematic variation of the metallophilic interactions between the Au-I ions of the alloy cluster and Cu-I ions formed by the reduction of Cu-II ions by the cluster core. This is the first report of tunable metallophilic interactions between monolayer-protected quantum clusters and a closed-shell metal ion. We hope that these results will draw more attention to the field of quantum cluster-metal ion interactions and provide useful insights into the stability of these clusters, origin of their intense luminescence, mechanisms of metal-ion sensing, and also help in the development of methods for tuning their properties.
dc.identifier.citationEuropean Journal of Inorganic Chemistry, 2014; 2014(5):908-916
dc.identifier.doi10.1002/ejic.201301424
dc.identifier.issn1434-1948
dc.identifier.issn1099-0682
dc.identifier.urihttps://hdl.handle.net/11541.2/128432
dc.language.isoen
dc.publisherWiley-VCH Verlag
dc.relation.fundingDST DST/TM/SERI/2k11/103
dc.relation.fundingDST SB/S1/PC-011/2013
dc.rightsCopyright 2014 Wiley-VCH Verlag
dc.source.urihttp://dx.doi.org/10.1002/ejic.201301424
dc.subjectclusters
dc.subjectnanoparticles
dc.subjectluminescence
dc.subjectmetallophilic interactions
dc.subjectsilver
dc.subjectgold
dc.titleLuminescent AgAu alloy clusters derived from Ag nanoparticles - manifestations of tunable Au-I-Cu-I metallophilic interactions
dc.typeJournal article
pubs.publication-statusPublished
ror.mmsid9916157305501831

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