Water-soluble, sulfonic acid-functionalized, monolayer-protested nanoparticles and an ionically conductive molten salt containing them

被引:64
作者
Shon, YS [1 ]
Wuelfing, WP [1 ]
Murray, RW [1 ]
机构
[1] Univ N Carolina, Kenan Labs Chem, Chapel Hill, NC 27599 USA
关键词
D O I
10.1021/la001220t
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Sulfonic acid-functionalized monolayer-protected gold clusters (SO3-MPCs) have been synthesized by the reaction of the Bunte (thiosulfate) salt of 2-acrylamido-2-methyl-1-propanesulfonic acid (SO3) with tetrachloroaurate and borohydride in aqueous acetic acid. The nanoparticles produced have an average core diameter, obtained by transmission electron microscopy (TEM), of 2.2 +/- 1.1 nm, and a 30 wt % ligand content, obtained by thermogravimetric analysis. These parameters, assuming an ideal closed-shell truncated octahedral nanoparticle, correspond to an average nanoparticle formula of Au(314)SO3(111) Proton NMR, Fourier transform infrared (FTIR), and UV/vis spectroscopies are consistent with nanoparticle formation, and acid/base titrations are consistent with the strong acid character of the SO3-MPC monolayer. These nanoparticles add to a growing family of water-soluble MPCs. Synthesis of a salt of SO3-MPC with a polyether-tailed triethylammonium countercation yields an ionically conductive molten salt, which is studied by alternating current impedance spectroscopy in the solid state (neat melt) and solution form.
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页码:1255 / 1261
页数:7
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