In a new two-phase system ( tetrahydrofuran/ saturated NaCl aqueous solution ) monolayer protected clusters ( MPCs ) were prepared. The AuCl-4 anion in saturated electrolyte aqueous solution was transferred into the organic phase of tetrahydrofuran by tetra-n-butylammoniun bromide ( ( C4 H9 )4 NBr )and was reduced quickly by sodium borohydride in the presence of alkanethiol. The functionalized MPCs were characterized by solubility , transmission electron microscopy (TEM), Fourier transform infrared spectroscopy ( FTIR ), energy-dispersive X-ray (EDX) analysis and UV-vis spectroscopy. Electrochemical measurements of MPCs in CH2 Cl2 exhibited 7 pairs of reversible voltammetric waves within the potential range of - 1.0 to 1.0 V ( vs Ag/ AgCl ), which was ascribed to the quantized capacitance charging of nanoparticle double layers. All the results show that the new preparing method is feasible.
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