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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 30, Number 11
BKCSDE 30(11)
November 20, 2009 

The Characterization of Borohydride-Stabilized Nanosilvers in Laponite Sol Using 1H NMR: Its Ligand Exchange Reactions with MUA and TOP
Jae Seok Seo, Dong Min Son, Hanna Lee, Jeekwang Kim, Youhyuk Kim*
Borohydride-protected nanosilvers, Laponite, MPCs, 11-Mercaptoundecanoic acid (MUA), 1H NMR
In borohydride-protected nanosilvers in laponite sol, the silver particles aggregate to form short chains and a dumbbell shape. The 1H NMR measurements in this study represent, to our knowledge, the first observation of proton resonances of borohydride-protected nanosilvers in aqueous solution. Borohydride on nanosilver can be exchanged with 11-mercaptoundecanoic acid (MUA) or trioctylphosphine (TOP). Transmission electron microscopy and UV-Vis spectroscopy data show that the number of aggregated silver nanoparticles decreases upon addition of aforementioned ligands due to the formation of silver MPCs (monolayer-protected clusters). Adsorption of MUA or TOP on nanosilver is confirmed through the observation of broad proton resonances of MPCs in 1H NMR spectra.
2651 - 2654
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